Bug Summary

File:compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
Warning:line 378, column 3
Undefined or garbage value returned to caller

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name sanitizer_linux.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D HAVE_RPC_XDR_H=1 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/projects/compiler-rt/lib/sanitizer_common -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/.. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-unused-parameter -Wno-variadic-macros -Wno-non-virtual-dtor -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/projects/compiler-rt/lib/sanitizer_common -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb=. -ferror-limit 19 -fvisibility hidden -fvisibility-inlines-hidden -fno-builtin -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-09-26-161721-17566-1 -x c++ /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

→
1//===-- sanitizer_linux.cpp -----------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is shared between AddressSanitizer and ThreadSanitizer
10// run-time libraries and implements linux-specific functions from
11// sanitizer_libc.h.
12//===----------------------------------------------------------------------===//
13
14#include "sanitizer_platform.h"
15
16#if SANITIZER_FREEBSD0 || SANITIZER_LINUX1 || SANITIZER_NETBSD0 || \
17 SANITIZER_OPENBSD0 || SANITIZER_SOLARIS0
18
19#include "sanitizer_common.h"
20#include "sanitizer_flags.h"
21#include "sanitizer_getauxval.h"
22#include "sanitizer_internal_defs.h"
23#include "sanitizer_libc.h"
24#include "sanitizer_linux.h"
25#include "sanitizer_mutex.h"
26#include "sanitizer_placement_new.h"
27#include "sanitizer_procmaps.h"
28
29#if SANITIZER_LINUX1 && !SANITIZER_GO0
30#include <asm/param.h>
31#endif
32
33// For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
34// format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
35// access stat from asm/stat.h, without conflicting with definition in
36// sys/stat.h, we use this trick.
37#if defined(__mips64)
38#include <asm/unistd.h>
39#include <sys/types.h>
40#define stat kernel_stat
41#include <asm/stat.h>
42#undef stat
43#endif
44
45#include <dlfcn.h>
46#include <errno(*__errno_location ()).h>
47#include <fcntl.h>
48#include <link.h>
49#include <pthread.h>
50#include <sched.h>
51#include <signal.h>
52#include <sys/mman.h>
53#include <sys/param.h>
54#if !SANITIZER_SOLARIS0
55#include <sys/ptrace.h>
56#endif
57#include <sys/resource.h>
58#include <sys/stat.h>
59#include <sys/syscall.h>
60#include <sys/time.h>
61#include <sys/types.h>
62#if !SANITIZER_OPENBSD0
63#include <ucontext.h>
64#endif
65#if SANITIZER_OPENBSD0
66#include <sys/futex.h>
67#include <sys/sysctl.h>
68#endif
69#include <unistd.h>
70
71#if SANITIZER_LINUX1
72#include <sys/utsname.h>
73#endif
74
75#if SANITIZER_LINUX1 && !SANITIZER_ANDROID0
76#include <sys/personality.h>
77#endif
78
79#if SANITIZER_FREEBSD0
80#include <sys/exec.h>
81#include <sys/sysctl.h>
82#include <machine/atomic.h>
83extern "C" {
84// <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
85// FreeBSD 9.2 and 10.0.
86#include <sys/umtx.h>
87}
88#include <sys/thr.h>
89#endif // SANITIZER_FREEBSD
90
91#if SANITIZER_NETBSD0
92#include <limits.h> // For NAME_MAX
93#include <sys/sysctl.h>
94#include <sys/exec.h>
95extern struct ps_strings *__ps_strings;
96#endif // SANITIZER_NETBSD
97
98#if SANITIZER_SOLARIS0
99#include <stdlib.h>
100#include <thread.h>
101#define environ _environ
102#endif
103
104extern char **environ;
105
106#if SANITIZER_LINUX1
107// <linux/time.h>
108struct kernel_timeval {
109 long tv_sec;
110 long tv_usec;
111};
112
113// <linux/futex.h> is broken on some linux distributions.
114const int FUTEX_WAIT = 0;
115const int FUTEX_WAKE = 1;
116const int FUTEX_PRIVATE_FLAG = 128;
117const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG;
118const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG;
119#endif // SANITIZER_LINUX
120
121// Are we using 32-bit or 64-bit Linux syscalls?
122// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
123// but it still needs to use 64-bit syscalls.
124#if SANITIZER_LINUX1 && (defined(__x86_64__1) || defined(__powerpc64__) || \
125 SANITIZER_WORDSIZE64 == 64)
126# define SANITIZER_LINUX_USES_64BIT_SYSCALLS1 1
127#else
128# define SANITIZER_LINUX_USES_64BIT_SYSCALLS1 0
129#endif
130
131// Note : FreeBSD had implemented both
132// Linux and OpenBSD apis, available from
133// future 12.x version most likely
134#if SANITIZER_LINUX1 && defined(__NR_getrandom318)
135# if !defined(GRND_NONBLOCK1)
136# define GRND_NONBLOCK1 1
137# endif
138# define SANITIZER_USE_GETRANDOM1 1
139#else
140# define SANITIZER_USE_GETRANDOM1 0
141#endif // SANITIZER_LINUX && defined(__NR_getrandom)
142
143#if SANITIZER_OPENBSD0
144# define SANITIZER_USE_GETENTROPY0 1
145#else
146# if SANITIZER_FREEBSD0 && __FreeBSD_version >= 1200000
147# define SANITIZER_USE_GETENTROPY0 1
148# else
149# define SANITIZER_USE_GETENTROPY0 0
150# endif
151#endif // SANITIZER_USE_GETENTROPY
152
153namespace __sanitizer {
154
155#if SANITIZER_LINUX1 && defined(__x86_64__1)
156#include "sanitizer_syscall_linux_x86_64.inc"
157#elif SANITIZER_LINUX1 && defined(__aarch64__)
158#include "sanitizer_syscall_linux_aarch64.inc"
159#elif SANITIZER_LINUX1 && defined(__arm__)
160#include "sanitizer_syscall_linux_arm.inc"
161#else
162#include "sanitizer_syscall_generic.inc"
163#endif
164
165// --------------- sanitizer_libc.h
166#if !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
167#if !SANITIZER_S3900 && !SANITIZER_OPENBSD0
168uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
169 u64 offset) {
170#if SANITIZER_FREEBSD0 || SANITIZER_LINUX_USES_64BIT_SYSCALLS1
171 return internal_syscall(SYSCALL(mmap)9, (uptr)addr, length, prot, flags, fd,
172 offset);
173#else
174 // mmap2 specifies file offset in 4096-byte units.
175 CHECK(IsAligned(offset, 4096))do { __sanitizer::u64 v1 = (__sanitizer::u64)((IsAligned(offset
, 4096))); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 175, "(" "(IsAligned(offset, 4096))" ") " "!=" " (" "0" ")"
, v1, v2); } while (false);
176 return internal_syscall(SYSCALL(mmap2)__NR_mmap2, addr, length, prot, flags, fd,
177 offset / 4096);
178#endif
179}
180#endif // !SANITIZER_S390 && !SANITIZER_OPENBSD
181
182#if !SANITIZER_OPENBSD0
183uptr internal_munmap(void *addr, uptr length) {
184 return internal_syscall(SYSCALL(munmap)11, (uptr)addr, length);
185}
186
187int internal_mprotect(void *addr, uptr length, int prot) {
188 return internal_syscall(SYSCALL(mprotect)10, (uptr)addr, length, prot);
189}
190
191int internal_madvise(uptr addr, uptr length, int advice) {
192 return internal_syscall(SYSCALL(madvise)28, addr, length, advice);
193}
194#endif
195
196uptr internal_close(fd_t fd) {
197 return internal_syscall(SYSCALL(close)3, fd);
198}
199
200uptr internal_open(const char *filename, int flags) {
201#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
202 return internal_syscall(SYSCALL(openat)257, AT_FDCWD-100, (uptr)filename, flags);
203#else
204 return internal_syscall(SYSCALL(open)2, (uptr)filename, flags);
205#endif
206}
207
208uptr internal_open(const char *filename, int flags, u32 mode) {
209#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
210 return internal_syscall(SYSCALL(openat)257, AT_FDCWD-100, (uptr)filename, flags,
211 mode);
212#else
213 return internal_syscall(SYSCALL(open)2, (uptr)filename, flags, mode);
214#endif
215}
216
217uptr internal_read(fd_t fd, void *buf, uptr count) {
218 sptr res;
219 HANDLE_EINTR(res,{ int rverrno; do { res = ((sptr)internal_syscall(0, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); }
220 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)){ int rverrno; do { res = ((sptr)internal_syscall(0, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); };
221 return res;
222}
223
224uptr internal_write(fd_t fd, const void *buf, uptr count) {
225 sptr res;
226 HANDLE_EINTR(res,{ int rverrno; do { res = ((sptr)internal_syscall(1, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); }
227 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)){ int rverrno; do { res = ((sptr)internal_syscall(1, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); };
228 return res;
229}
230
231uptr internal_ftruncate(fd_t fd, uptr size) {
232 sptr res;
233 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,{ int rverrno; do { res = ((sptr)internal_syscall(77, fd, (OFF_T
)size)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); }
234 (OFF_T)size)){ int rverrno; do { res = ((sptr)internal_syscall(77, fd, (OFF_T
)size)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); };
235 return res;
236}
237
238#if !SANITIZER_LINUX_USES_64BIT_SYSCALLS1 && SANITIZER_LINUX1
239static void stat64_to_stat(struct stat64 *in, struct stat *out) {
240 internal_memset(out, 0, sizeof(*out));
241 out->st_dev = in->st_dev;
242 out->st_ino = in->st_ino;
243 out->st_mode = in->st_mode;
244 out->st_nlink = in->st_nlink;
245 out->st_uid = in->st_uid;
246 out->st_gid = in->st_gid;
247 out->st_rdev = in->st_rdev;
248 out->st_size = in->st_size;
249 out->st_blksize = in->st_blksize;
250 out->st_blocks = in->st_blocks;
251 out->st_atimest_atim.tv_sec = in->st_atimest_atim.tv_sec;
252 out->st_mtimest_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
253 out->st_ctimest_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
254}
255#endif
256
257#if defined(__mips64)
258// Undefine compatibility macros from <sys/stat.h>
259// so that they would not clash with the kernel_stat
260// st_[a|m|c]time fields
261#undef st_atimest_atim.tv_sec
262#undef st_mtimest_mtim.tv_sec
263#undef st_ctimest_ctim.tv_sec
264#if defined(SANITIZER_ANDROID0)
265// Bionic sys/stat.h defines additional macros
266// for compatibility with the old NDKs and
267// they clash with the kernel_stat structure
268// st_[a|m|c]time_nsec fields.
269#undef st_atime_nsec
270#undef st_mtime_nsec
271#undef st_ctime_nsec
272#endif
273static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
274 internal_memset(out, 0, sizeof(*out));
275 out->st_dev = in->st_dev;
276 out->st_ino = in->st_ino;
277 out->st_mode = in->st_mode;
278 out->st_nlink = in->st_nlink;
279 out->st_uid = in->st_uid;
280 out->st_gid = in->st_gid;
281 out->st_rdev = in->st_rdev;
282 out->st_size = in->st_size;
283 out->st_blksize = in->st_blksize;
284 out->st_blocks = in->st_blocks;
285#if defined(__USE_MISC1) || \
286 defined(__USE_XOPEN2K81) || \
287 defined(SANITIZER_ANDROID0)
288 out->st_atim.tv_sec = in->st_atimest_atim.tv_sec;
289 out->st_atim.tv_nsec = in->st_atime_nsec;
290 out->st_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
291 out->st_mtim.tv_nsec = in->st_mtime_nsec;
292 out->st_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
293 out->st_ctim.tv_nsec = in->st_ctime_nsec;
294#else
295 out->st_atimest_atim.tv_sec = in->st_atimest_atim.tv_sec;
296 out->st_atimensec = in->st_atime_nsec;
297 out->st_mtimest_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
298 out->st_mtimensec = in->st_mtime_nsec;
299 out->st_ctimest_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
300 out->st_atimensec = in->st_ctime_nsec;
301#endif
302}
303#endif
304
305uptr internal_stat(const char *path, void *buf) {
306#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
307 return internal_syscall(SYSCALL(fstatat)__NR_fstatat, AT_FDCWD-100, (uptr)path, (uptr)buf, 0);
308#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
309 return internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, (uptr)path, (uptr)buf,
310 0);
311#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS1
312# if defined(__mips64)
313 // For mips64, stat syscall fills buffer in the format of kernel_stat
314 struct kernel_stat kbuf;
315 int res = internal_syscall(SYSCALL(stat)4, path, &kbuf);
316 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
317 return res;
318# else
319 return internal_syscall(SYSCALL(stat)4, (uptr)path, (uptr)buf);
320# endif
321#else
322 struct stat64 buf64;
323 int res = internal_syscall(SYSCALL(stat64)__NR_stat64, path, &buf64);
324 stat64_to_stat(&buf64, (struct stat *)buf);
325 return res;
326#endif
327}
328
329uptr internal_lstat(const char *path, void *buf) {
330#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
331 return internal_syscall(SYSCALL(fstatat)__NR_fstatat, AT_FDCWD-100, (uptr)path, (uptr)buf,
332 AT_SYMLINK_NOFOLLOW0x100);
333#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
334 return internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, (uptr)path, (uptr)buf,
335 AT_SYMLINK_NOFOLLOW0x100);
336#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS1
337# if SANITIZER_MIPS640
338 // For mips64, lstat syscall fills buffer in the format of kernel_stat
339 struct kernel_stat kbuf;
340 int res = internal_syscall(SYSCALL(lstat)6, path, &kbuf);
341 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
342 return res;
343# else
344 return internal_syscall(SYSCALL(lstat)6, (uptr)path, (uptr)buf);
345# endif
346#else
347 struct stat64 buf64;
348 int res = internal_syscall(SYSCALL(lstat64)__NR_lstat64, path, &buf64);
349 stat64_to_stat(&buf64, (struct stat *)buf);
350 return res;
351#endif
352}
353
354uptr internal_fstat(fd_t fd, void *buf) {
355#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0 || \
356 SANITIZER_LINUX_USES_64BIT_SYSCALLS1
357#if SANITIZER_MIPS640 && !SANITIZER_OPENBSD0
358 // For mips64, fstat syscall fills buffer in the format of kernel_stat
359 struct kernel_stat kbuf;
360 int res = internal_syscall(SYSCALL(fstat)5, fd, &kbuf);
361 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
362 return res;
363# else
364 return internal_syscall(SYSCALL(fstat)5, fd, (uptr)buf);
2
←
Calling 'internal_syscall<int, unsigned long>'
→
4
←
Returning from 'internal_syscall<int, unsigned long>'
→
5
←
Returning without writing to 'buf->st_size'
→
365# endif
366#else
367 struct stat64 buf64;
368 int res = internal_syscall(SYSCALL(fstat64)__NR_fstat64, fd, &buf64);
369 stat64_to_stat(&buf64, (struct stat *)buf);
370 return res;
371#endif
372}
373
374uptr internal_filesize(fd_t fd) {
375 struct stat st;
376 if (internal_fstat(fd, &st))
1
Calling 'internal_fstat'
→
6
←
Returning from 'internal_fstat'
→
7
←
Assuming the condition is false
→
8
←
Taking false branch
→
377 return -1;
378 return (uptr)st.st_size;
9
←
Undefined or garbage value returned to caller
379}
380
381uptr internal_dup(int oldfd) {
382 return internal_syscall(SYSCALL(dup)32, oldfd);
383}
384
385uptr internal_dup2(int oldfd, int newfd) {
386#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
387 return internal_syscall(SYSCALL(dup3)292, oldfd, newfd, 0);
388#else
389 return internal_syscall(SYSCALL(dup2)33, oldfd, newfd);
390#endif
391}
392
393uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
394#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
395 return internal_syscall(SYSCALL(readlinkat)267, AT_FDCWD-100, (uptr)path, (uptr)buf,
396 bufsize);
397#elif SANITIZER_OPENBSD0
398 return internal_syscall(SYSCALL(readlinkat)267, AT_FDCWD-100, (uptr)path, (uptr)buf,
399 bufsize);
400#else
401 return internal_syscall(SYSCALL(readlink)89, (uptr)path, (uptr)buf, bufsize);
402#endif
403}
404
405uptr internal_unlink(const char *path) {
406#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0 || SANITIZER_OPENBSD0
407 return internal_syscall(SYSCALL(unlinkat)263, AT_FDCWD-100, (uptr)path, 0);
408#else
409 return internal_syscall(SYSCALL(unlink)87, (uptr)path);
410#endif
411}
412
413uptr internal_rename(const char *oldpath, const char *newpath) {
414#if defined(__riscv)
415 return internal_syscall(SYSCALL(renameat2)316, AT_FDCWD-100, (uptr)oldpath, AT_FDCWD-100,
416 (uptr)newpath, 0);
417#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0 || SANITIZER_OPENBSD0
418 return internal_syscall(SYSCALL(renameat)264, AT_FDCWD-100, (uptr)oldpath, AT_FDCWD-100,
419 (uptr)newpath);
420#else
421 return internal_syscall(SYSCALL(rename)82, (uptr)oldpath, (uptr)newpath);
422#endif
423}
424
425uptr internal_sched_yield() {
426 return internal_syscall(SYSCALL(sched_yield)24);
427}
428
429void internal__exit(int exitcode) {
430#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
431 internal_syscall(SYSCALL(exit)60, exitcode);
432#else
433 internal_syscall(SYSCALL(exit_group)231, exitcode);
434#endif
435 Die(); // Unreachable.
436}
437
438unsigned int internal_sleep(unsigned int seconds) {
439 struct timespec ts;
440 ts.tv_sec = seconds;
441 ts.tv_nsec = 0;
442 int res = internal_syscall(SYSCALL(nanosleep)35, &ts, &ts);
443 if (res) return ts.tv_sec;
444 return 0;
445}
446
447uptr internal_execve(const char *filename, char *const argv[],
448 char *const envp[]) {
449 return internal_syscall(SYSCALL(execve)59, (uptr)filename, (uptr)argv,
450 (uptr)envp);
451}
452#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
453
454// ----------------- sanitizer_common.h
455bool FileExists(const char *filename) {
456 if (ShouldMockFailureToOpen(filename))
457 return false;
458 struct stat st;
459#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
460 if (internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, filename, &st, 0))
461#else
462 if (internal_stat(filename, &st))
463#endif
464 return false;
465 // Sanity check: filename is a regular file.
466 return S_ISREG(st.st_mode)((((st.st_mode)) & 0170000) == (0100000));
467}
468
469#if !SANITIZER_NETBSD0
470tid_t GetTid() {
471#if SANITIZER_FREEBSD0
472 long Tid;
473 thr_self(&Tid);
474 return Tid;
475#elif SANITIZER_OPENBSD0
476 return internal_syscall(SYSCALL(getthrid)__NR_getthrid);
477#elif SANITIZER_SOLARIS0
478 return thr_self();
479#else
480 return internal_syscall(SYSCALL(gettid)186);
481#endif
482}
483
484int TgKill(pid_t pid, tid_t tid, int sig) {
485#if SANITIZER_LINUX1
486 return internal_syscall(SYSCALL(tgkill)234, pid, tid, sig);
487#elif SANITIZER_FREEBSD0
488 return internal_syscall(SYSCALL(thr_kill2)__NR_thr_kill2, pid, tid, sig);
489#elif SANITIZER_OPENBSD0
490 (void)pid;
491 return internal_syscall(SYSCALL(thrkill)__NR_thrkill, tid, sig, nullptr);
492#elif SANITIZER_SOLARIS0
493 (void)pid;
494 return thr_kill(tid, sig);
495#endif
496}
497#endif
498
499#if !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
500u64 NanoTime() {
501#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
502 timeval tv;
503#else
504 kernel_timeval tv;
505#endif
506 internal_memset(&tv, 0, sizeof(tv));
507 internal_syscall(SYSCALL(gettimeofday)96, &tv, 0);
508 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
509}
510
511uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) {
512 return internal_syscall(SYSCALL(clock_gettime)228, clk_id, tp);
513}
514#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
515
516// Like getenv, but reads env directly from /proc (on Linux) or parses the
517// 'environ' array (on some others) and does not use libc. This function
518// should be called first inside __asan_init.
519const char *GetEnv(const char *name) {
520#if SANITIZER_FREEBSD0 || SANITIZER_NETBSD0 || SANITIZER_OPENBSD0 || \
521 SANITIZER_SOLARIS0
522 if (::environ != 0) {
523 uptr NameLen = internal_strlen(name);
524 for (char **Env = ::environ; *Env != 0; Env++) {
525 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
526 return (*Env) + NameLen + 1;
527 }
528 }
529 return 0; // Not found.
530#elif SANITIZER_LINUX1
531 static char *environ;
532 static uptr len;
533 static bool inited;
534 if (!inited) {
535 inited = true;
536 uptr environ_size;
537 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
538 environ = nullptr;
539 }
540 if (!environ || len == 0) return nullptr;
541 uptr namelen = internal_strlen(name);
542 const char *p = environ;
543 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
544 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
545 const char* endp =
546 (char*)internal_memchr(p, '\0', len - (p - environ));
547 if (!endp) // this entry isn't NUL terminated
548 return nullptr;
549 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
550 return p + namelen + 1; // point after =
551 p = endp + 1;
552 }
553 return nullptr; // Not found.
554#else
555#error "Unsupported platform"
556#endif
557}
558
559#if !SANITIZER_FREEBSD0 && !SANITIZER_NETBSD0 && !SANITIZER_OPENBSD0 && \
560 !SANITIZER_GO0
561extern "C" {
562SANITIZER_WEAK_ATTRIBUTE__attribute__((weak)) extern void *__libc_stack_end;
563}
564#endif
565
566#if !SANITIZER_FREEBSD0 && !SANITIZER_NETBSD0 && \
567 !SANITIZER_OPENBSD0
568static void ReadNullSepFileToArray(const char *path, char ***arr,
569 int arr_size) {
570 char *buff;
571 uptr buff_size;
572 uptr buff_len;
573 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
574 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
575 (*arr)[0] = nullptr;
576 return;
577 }
578 (*arr)[0] = buff;
579 int count, i;
580 for (count = 1, i = 1; ; i++) {
581 if (buff[i] == 0) {
582 if (buff[i+1] == 0) break;
583 (*arr)[count] = &buff[i+1];
584 CHECK_LE(count, arr_size - 1)do { __sanitizer::u64 v1 = (__sanitizer::u64)((count)); __sanitizer
::u64 v2 = (__sanitizer::u64)((arr_size - 1)); if (__builtin_expect
(!!(!(v1 <= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 584, "(" "(count)" ") " "<=" " (" "(arr_size - 1)" ")", v1
, v2); } while (false); // FIXME: make this more flexible.
585 count++;
586 }
587 }
588 (*arr)[count] = nullptr;
589}
590#endif
591
592#if !SANITIZER_OPENBSD0
593static void GetArgsAndEnv(char ***argv, char ***envp) {
594#if SANITIZER_FREEBSD0
595 // On FreeBSD, retrieving the argument and environment arrays is done via the
596 // kern.ps_strings sysctl, which returns a pointer to a structure containing
597 // this information. See also <sys/exec.h>.
598 ps_strings *pss;
599 uptr sz = sizeof(pss);
600 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL__null, 0) == -1) {
601 Printf("sysctl kern.ps_strings failed\n");
602 Die();
603 }
604 *argv = pss->ps_argvstr;
605 *envp = pss->ps_envstr;
606#elif SANITIZER_NETBSD0
607 *argv = __ps_strings->ps_argvstr;
608 *envp = __ps_strings->ps_envstr;
609#else // SANITIZER_FREEBSD
610#if !SANITIZER_GO0
611 if (&__libc_stack_end) {
612 uptr* stack_end = (uptr*)__libc_stack_end;
613 // Normally argc can be obtained from *stack_end, however, on ARM glibc's
614 // _start clobbers it:
615 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75
616 // Do not special-case ARM and infer argc from argv everywhere.
617 int argc = 0;
618 while (stack_end[argc + 1]) argc++;
619 *argv = (char**)(stack_end + 1);
620 *envp = (char**)(stack_end + argc + 2);
621 } else {
622#endif // !SANITIZER_GO
623 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
624 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
625 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
626#if !SANITIZER_GO0
627 }
628#endif // !SANITIZER_GO
629#endif // SANITIZER_FREEBSD
630}
631
632char **GetArgv() {
633 char **argv, **envp;
634 GetArgsAndEnv(&argv, &envp);
635 return argv;
636}
637
638char **GetEnviron() {
639 char **argv, **envp;
640 GetArgsAndEnv(&argv, &envp);
641 return envp;
642}
643
644#endif // !SANITIZER_OPENBSD
645
646#if !SANITIZER_SOLARIS0
647enum MutexState {
648 MtxUnlocked = 0,
649 MtxLocked = 1,
650 MtxSleeping = 2
651};
652
653BlockingMutex::BlockingMutex() {
654 internal_memset(this, 0, sizeof(*this));
655}
656
657void BlockingMutex::Lock() {
658 CHECK_EQ(owner_, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((owner_)); __sanitizer
::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect(!!(!
(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 658, "(" "(owner_)" ") " "==" " (" "(0)" ")", v1, v2); } while
(false);
659 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
660 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
661 return;
662 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
663#if SANITIZER_FREEBSD0
664 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
665#elif SANITIZER_NETBSD0
666 sched_yield(); /* No userspace futex-like synchronization */
667#else
668 internal_syscall(SYSCALL(futex)202, (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping,
669 0, 0, 0);
670#endif
671 }
672}
673
674void BlockingMutex::Unlock() {
675 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
676 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
677 CHECK_NE(v, MtxUnlocked)do { __sanitizer::u64 v1 = (__sanitizer::u64)((v)); __sanitizer
::u64 v2 = (__sanitizer::u64)((MtxUnlocked)); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 677, "(" "(v)" ") " "!=" " (" "(MtxUnlocked)" ")", v1, v2);
} while (false);
678 if (v == MtxSleeping) {
679#if SANITIZER_FREEBSD0
680 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
681#elif SANITIZER_NETBSD0
682 /* No userspace futex-like synchronization */
683#else
684 internal_syscall(SYSCALL(futex)202, (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0);
685#endif
686 }
687}
688
689void BlockingMutex::CheckLocked() {
690 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
691 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed))do { __sanitizer::u64 v1 = (__sanitizer::u64)((MtxUnlocked));
__sanitizer::u64 v2 = (__sanitizer::u64)((atomic_load(m, memory_order_relaxed
))); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 691, "(" "(MtxUnlocked)" ") " "!=" " (" "(atomic_load(m, memory_order_relaxed))"
")", v1, v2); } while (false);
692}
693#endif // !SANITIZER_SOLARIS
694
695// ----------------- sanitizer_linux.h
696// The actual size of this structure is specified by d_reclen.
697// Note that getdents64 uses a different structure format. We only provide the
698// 32-bit syscall here.
699#if SANITIZER_NETBSD0
700// Not used
701#elif SANITIZER_OPENBSD0
702// struct dirent is different for Linux and us. At this moment, we use only
703// d_fileno (Linux call this d_ino), d_reclen, and d_name.
704struct linux_dirent {
705 u64 d_ino; // d_fileno
706 u16 d_reclen;
707 u16 d_namlen; // not used
708 u8 d_type; // not used
709 char d_name[NAME_MAX255 + 1];
710};
711#else
712struct linux_dirent {
713#if SANITIZER_X320 || defined(__aarch64__)
714 u64 d_ino;
715 u64 d_off;
716#else
717 unsigned long d_ino;
718 unsigned long d_off;
719#endif
720 unsigned short d_reclen;
721#ifdef __aarch64__
722 unsigned char d_type;
723#endif
724 char d_name[256];
725};
726#endif
727
728#if !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
729// Syscall wrappers.
730uptr internal_ptrace(int request, int pid, void *addr, void *data) {
731 return internal_syscall(SYSCALL(ptrace)101, request, pid, (uptr)addr,
732 (uptr)data);
733}
734
735uptr internal_waitpid(int pid, int *status, int options) {
736 return internal_syscall(SYSCALL(wait4)61, pid, (uptr)status, options,
737 0 /* rusage */);
738}
739
740uptr internal_getpid() {
741 return internal_syscall(SYSCALL(getpid)39);
742}
743
744uptr internal_getppid() {
745 return internal_syscall(SYSCALL(getppid)110);
746}
747
748int internal_dlinfo(void *handle, int request, void *p) {
749#if SANITIZER_FREEBSD0
750 return dlinfo(handle, request, p);
751#else
752 UNIMPLEMENTED()do { do { __sanitizer::u64 v1 = (__sanitizer::u64)((0 &&
"unimplemented")); __sanitizer::u64 v2 = (__sanitizer::u64)(
0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 752, "(" "(0 && \"unimplemented\")" ") " "!=" " (" "0"
")", v1, v2); } while (false); Die(); } while (0);
753#endif
754}
755
756uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
757#if SANITIZER_FREEBSD0
758 return internal_syscall(SYSCALL(getdirentries)__NR_getdirentries, fd, (uptr)dirp, count, NULL__null);
759#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
760 return internal_syscall(SYSCALL(getdents64)217, fd, (uptr)dirp, count);
761#else
762 return internal_syscall(SYSCALL(getdents)78, fd, (uptr)dirp, count);
763#endif
764}
765
766uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
767 return internal_syscall(SYSCALL(lseek)8, fd, offset, whence);
768}
769
770#if SANITIZER_LINUX1
771uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
772 return internal_syscall(SYSCALL(prctl)157, option, arg2, arg3, arg4, arg5);
773}
774#endif
775
776uptr internal_sigaltstack(const void *ss, void *oss) {
777 return internal_syscall(SYSCALL(sigaltstack)131, (uptr)ss, (uptr)oss);
778}
779
780int internal_fork() {
781#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
782 return internal_syscall(SYSCALL(clone)56, SIGCHLD17, 0);
783#else
784 return internal_syscall(SYSCALL(fork)57);
785#endif
786}
787
788#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
789int internal_sysctl(const int *name, unsigned int namelen, void *oldp,
790 uptr *oldlenp, const void *newp, uptr newlen) {
791#if SANITIZER_OPENBSD0
792 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp,
793 (size_t)newlen);
794#else
795 return internal_syscall(SYSCALL(__sysctl)__NR___sysctl, name, namelen, oldp,
796 (size_t *)oldlenp, newp, (size_t)newlen);
797#endif
798}
799
800#if SANITIZER_FREEBSD0
801int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp,
802 const void *newp, uptr newlen) {
803 // Note: this function can be called during startup, so we need to avoid
804 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname()
805 // is a real syscall, but for older versions it calls sysctlnametomib()
806 // followed by sysctl(). To avoid calling the intercepted version and
807 // asserting if this happens during startup, call the real sysctlnametomib()
808 // followed by internal_sysctl() if the syscall is not available.
809#ifdef SYS___sysctlbyname
810 return internal_syscall(SYSCALL(__sysctlbyname)__NR___sysctlbyname, sname,
811 internal_strlen(sname), oldp, (size_t *)oldlenp, newp,
812 (size_t)newlen);
813#else
814 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr;
815 if (!real_sysctlnametomib)
816 real_sysctlnametomib =
817 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT((void *) -1l), "sysctlnametomib");
818 CHECK(real_sysctlnametomib)do { __sanitizer::u64 v1 = (__sanitizer::u64)((real_sysctlnametomib
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 818, "(" "(real_sysctlnametomib)" ") " "!=" " (" "0" ")", v1
, v2); } while (false);
819
820 int oid[CTL_MAXNAME];
821 size_t len = CTL_MAXNAME;
822 if (real_sysctlnametomib(sname, oid, &len) == -1)
823 return (-1);
824 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen);
825#endif
826}
827#endif
828#endif
829
830#if SANITIZER_LINUX1
831#define SA_RESTORER0x04000000 0x04000000
832// Doesn't set sa_restorer if the caller did not set it, so use with caution
833//(see below).
834int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
835 __sanitizer_kernel_sigaction_t k_act, k_oldact;
836 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
837 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
838 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
839 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
840 if (u_act) {
841 k_act.handler = u_act->handler;
842 k_act.sigaction = u_act->sigaction;
843 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
844 sizeof(__sanitizer_kernel_sigset_t));
845 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
846 k_act.sa_flags = u_act->sa_flags | SA_RESTORER0x04000000;
847 // FIXME: most often sa_restorer is unset, however the kernel requires it
848 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
849 // If sa_restorer passed to the kernel is NULL, the program may crash upon
850 // signal delivery or fail to unwind the stack in the signal handler.
851 // libc implementation of sigaction() passes its own restorer to
852 // rt_sigaction, so we need to do the same (we'll need to reimplement the
853 // restorers; for x86_64 the restorer address can be obtained from
854 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
855#if !SANITIZER_ANDROID0 || !SANITIZER_MIPS320
856 k_act.sa_restorer = u_act->sa_restorer;
857#endif
858 }
859
860 uptr result = internal_syscall(SYSCALL(rt_sigaction)13, (uptr)signum,
861 (uptr)(u_act ? &k_act : nullptr),
862 (uptr)(u_oldact ? &k_oldact : nullptr),
863 (uptr)sizeof(__sanitizer_kernel_sigset_t));
864
865 if ((result == 0) && u_oldact) {
866 u_oldact->handler = k_oldact.handler;
867 u_oldact->sigaction = k_oldact.sigaction;
868 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
869 sizeof(__sanitizer_kernel_sigset_t));
870 u_oldact->sa_flags = k_oldact.sa_flags;
871#if !SANITIZER_ANDROID0 || !SANITIZER_MIPS320
872 u_oldact->sa_restorer = k_oldact.sa_restorer;
873#endif
874 }
875 return result;
876}
877#endif // SANITIZER_LINUX
878
879uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
880 __sanitizer_sigset_t *oldset) {
881#if SANITIZER_FREEBSD0 || SANITIZER_OPENBSD0
882 return internal_syscall(SYSCALL(sigprocmask)__NR_sigprocmask, how, set, oldset);
883#else
884 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
885 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
886 return internal_syscall(SYSCALL(rt_sigprocmask)14, (uptr)how, (uptr)k_set,
887 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t));
888#endif
889}
890
891void internal_sigfillset(__sanitizer_sigset_t *set) {
892 internal_memset(set, 0xff, sizeof(*set));
893}
894
895void internal_sigemptyset(__sanitizer_sigset_t *set) {
896 internal_memset(set, 0, sizeof(*set));
897}
898
899#if SANITIZER_LINUX1
900void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
901 signum -= 1;
902 CHECK_GE(signum, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((signum)); __sanitizer
::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect(!!(!
(v1 >= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 902, "(" "(signum)" ") " ">=" " (" "(0)" ")", v1, v2); }
while (false);
903 CHECK_LT(signum, sizeof(*set) * 8)do { __sanitizer::u64 v1 = (__sanitizer::u64)((signum)); __sanitizer
::u64 v2 = (__sanitizer::u64)((sizeof(*set) * 8)); if (__builtin_expect
(!!(!(v1 < v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 903, "(" "(signum)" ") " "<" " (" "(sizeof(*set) * 8)" ")"
, v1, v2); } while (false);
904 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
905 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
906 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
907 k_set->sig[idx] &= ~(1 << bit);
908}
909
910bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
911 signum -= 1;
912 CHECK_GE(signum, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((signum)); __sanitizer
::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect(!!(!
(v1 >= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 912, "(" "(signum)" ") " ">=" " (" "(0)" ")", v1, v2); }
while (false);
913 CHECK_LT(signum, sizeof(*set) * 8)do { __sanitizer::u64 v1 = (__sanitizer::u64)((signum)); __sanitizer
::u64 v2 = (__sanitizer::u64)((sizeof(*set) * 8)); if (__builtin_expect
(!!(!(v1 < v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 913, "(" "(signum)" ") " "<" " (" "(sizeof(*set) * 8)" ")"
, v1, v2); } while (false);
914 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
915 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
916 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
917 return k_set->sig[idx] & (1 << bit);
918}
919#elif SANITIZER_FREEBSD0
920void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
921 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
922 sigdelset(rset, signum);
923}
924
925bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
926 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
927 return sigismember(rset, signum);
928}
929#endif
930#endif // !SANITIZER_SOLARIS
931
932#if !SANITIZER_NETBSD0
933// ThreadLister implementation.
934ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) {
935 char task_directory_path[80];
936 internal_snprintf(task_directory_path, sizeof(task_directory_path),
937 "/proc/%d/task/", pid);
938 descriptor_ = internal_open(task_directory_path, O_RDONLY00 | O_DIRECTORY0200000);
939 if (internal_iserror(descriptor_)) {
940 Report("Can't open /proc/%d/task for reading.\n", pid);
941 }
942}
943
944ThreadLister::Result ThreadLister::ListThreads(
945 InternalMmapVector<tid_t> *threads) {
946 if (internal_iserror(descriptor_))
947 return Error;
948 internal_lseek(descriptor_, 0, SEEK_SET0);
949 threads->clear();
950
951 Result result = Ok;
952 for (bool first_read = true;; first_read = false) {
953 // Resize to max capacity if it was downsized by IsAlive.
954 buffer_.resize(buffer_.capacity());
955 CHECK_GE(buffer_.size(), 4096)do { __sanitizer::u64 v1 = (__sanitizer::u64)((buffer_.size()
)); __sanitizer::u64 v2 = (__sanitizer::u64)((4096)); if (__builtin_expect
(!!(!(v1 >= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 955, "(" "(buffer_.size())" ") " ">=" " (" "(4096)" ")",
v1, v2); } while (false);
956 uptr read = internal_getdents(
957 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size());
958 if (!read)
959 return result;
960 if (internal_iserror(read)) {
961 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
962 return Error;
963 }
964
965 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) {
966 struct linux_dirent *entry = (struct linux_dirent *)begin;
967 begin += entry->d_reclen;
968 if (entry->d_ino == 1) {
969 // Inode 1 is for bad blocks and also can be a reason for early return.
970 // Should be emitted if kernel tried to output terminating thread.
971 // See proc_task_readdir implementation in Linux.
972 result = Incomplete;
973 }
974 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9')
975 threads->push_back(internal_atoll(entry->d_name));
976 }
977
978 // Now we are going to detect short-read or early EOF. In such cases Linux
979 // can return inconsistent list with missing alive threads.
980 // Code will just remember that the list can be incomplete but it will
981 // continue reads to return as much as possible.
982 if (!first_read) {
983 // The first one was a short-read by definition.
984 result = Incomplete;
985 } else if (read > buffer_.size() - 1024) {
986 // Read was close to the buffer size. So double the size and assume the
987 // worst.
988 buffer_.resize(buffer_.size() * 2);
989 result = Incomplete;
990 } else if (!threads->empty() && !IsAlive(threads->back())) {
991 // Maybe Linux early returned from read on terminated thread (!pid_alive)
992 // and failed to restore read position.
993 // See next_tid and proc_task_instantiate in Linux.
994 result = Incomplete;
995 }
996 }
997}
998
999bool ThreadLister::IsAlive(int tid) {
1000 // /proc/%d/task/%d/status uses same call to detect alive threads as
1001 // proc_task_readdir. See task_state implementation in Linux.
1002 char path[80];
1003 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid);
1004 if (!ReadFileToVector(path, &buffer_) || buffer_.empty())
1005 return false;
1006 buffer_.push_back(0);
1007 static const char kPrefix[] = "\nPPid:";
1008 const char *field = internal_strstr(buffer_.data(), kPrefix);
1009 if (!field)
1010 return false;
1011 field += internal_strlen(kPrefix);
1012 return (int)internal_atoll(field) != 0;
1013}
1014
1015ThreadLister::~ThreadLister() {
1016 if (!internal_iserror(descriptor_))
1017 internal_close(descriptor_);
1018}
1019#endif
1020
1021#if SANITIZER_WORDSIZE64 == 32
1022// Take care of unusable kernel area in top gigabyte.
1023static uptr GetKernelAreaSize() {
1024#if SANITIZER_LINUX1 && !SANITIZER_X320
1025 const uptr gbyte = 1UL << 30;
1026
1027 // Firstly check if there are writable segments
1028 // mapped to top gigabyte (e.g. stack).
1029 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
1030 if (proc_maps.Error())
1031 return 0;
1032 MemoryMappedSegment segment;
1033 while (proc_maps.Next(&segment)) {
1034 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0;
1035 }
1036
1037#if !SANITIZER_ANDROID0
1038 // Even if nothing is mapped, top Gb may still be accessible
1039 // if we are running on 64-bit kernel.
1040 // Uname may report misleading results if personality type
1041 // is modified (e.g. under schroot) so check this as well.
1042 struct utsname uname_info;
1043 int pers = personality(0xffffffffUL);
1044 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 &&
1045 internal_strstr(uname_info.machine, "64"))
1046 return 0;
1047#endif // SANITIZER_ANDROID
1048
1049 // Top gigabyte is reserved for kernel.
1050 return gbyte;
1051#else
1052 return 0;
1053#endif // SANITIZER_LINUX && !SANITIZER_X32
1054}
1055#endif // SANITIZER_WORDSIZE == 32
1056
1057uptr GetMaxVirtualAddress() {
1058#if (SANITIZER_NETBSD0 || SANITIZER_OPENBSD0) && defined(__x86_64__1)
1059 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE)
1060#elif SANITIZER_WORDSIZE64 == 64
1061# if defined(__powerpc64__) || defined(__aarch64__)
1062 // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
1063 // We somehow need to figure out which one we are using now and choose
1064 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
1065 // Note that with 'ulimit -s unlimited' the stack is moved away from the top
1066 // of the address space, so simply checking the stack address is not enough.
1067 // This should (does) work for both PowerPC64 Endian modes.
1068 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
1069 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()(__sanitizer::uptr) __builtin_frame_address(0)) + 1)) - 1;
1070# elif defined(__mips64)
1071 return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
1072# elif defined(__s390x__)
1073 return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
1074#elif defined(__sparc__)
1075 return ~(uptr)0;
1076# else
1077 return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
1078# endif
1079#else // SANITIZER_WORDSIZE == 32
1080# if defined(__s390__)
1081 return (1ULL << 31) - 1; // 0x7fffffff;
1082# else
1083 return (1ULL << 32) - 1; // 0xffffffff;
1084# endif
1085#endif // SANITIZER_WORDSIZE
1086}
1087
1088uptr GetMaxUserVirtualAddress() {
1089 uptr addr = GetMaxVirtualAddress();
1090#if SANITIZER_WORDSIZE64 == 32 && !defined(__s390__)
1091 if (!common_flags()->full_address_space)
1092 addr -= GetKernelAreaSize();
1093 CHECK_LT(reinterpret_cast<uptr>(&addr), addr)do { __sanitizer::u64 v1 = (__sanitizer::u64)((reinterpret_cast
<uptr>(&addr))); __sanitizer::u64 v2 = (__sanitizer
::u64)((addr)); if (__builtin_expect(!!(!(v1 < v2)), 0)) __sanitizer
::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1093, "(" "(reinterpret_cast<uptr>(&addr))" ") " "<"
" (" "(addr)" ")", v1, v2); } while (false);
1094#endif
1095 return addr;
1096}
1097
1098#if !SANITIZER_ANDROID0
1099uptr GetPageSize() {
1100#if SANITIZER_LINUX1 && (defined(__x86_64__1) || defined(__i386__)) && \
1101 defined(EXEC_PAGESIZE4096)
1102 return EXEC_PAGESIZE4096;
1103#elif SANITIZER_FREEBSD0 || SANITIZER_NETBSD0
1104// Use sysctl as sysconf can trigger interceptors internally.
1105 int pz = 0;
1106 uptr pzl = sizeof(pz);
1107 int mib[2] = {CTL_HW, HW_PAGESIZE};
1108 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0);
1109 CHECK_EQ(rv, 0)do { __sanitizer::u64 v1 = (__sanitizer::u64)((rv)); __sanitizer
::u64 v2 = (__sanitizer::u64)((0)); if (__builtin_expect(!!(!
(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1109, "(" "(rv)" ") " "==" " (" "(0)" ")", v1, v2); } while
(false);
1110 return (uptr)pz;
1111#elif SANITIZER_USE_GETAUXVAL1
1112 return getauxval(AT_PAGESZ6);
1113#else
1114 return sysconf(_SC_PAGESIZE_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
1115#endif
1116}
1117#endif // !SANITIZER_ANDROID
1118
1119#if !SANITIZER_OPENBSD0
1120uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
1121#if SANITIZER_SOLARIS0
1122 const char *default_module_name = getexecname();
1123 CHECK_NE(default_module_name, NULL)do { __sanitizer::u64 v1 = (__sanitizer::u64)((default_module_name
)); __sanitizer::u64 v2 = (__sanitizer::u64)((__null)); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1123, "(" "(default_module_name)" ") " "!=" " (" "(__null)"
")", v1, v2); } while (false);
1124 return internal_snprintf(buf, buf_len, "%s", default_module_name);
1125#else
1126#if SANITIZER_FREEBSD0 || SANITIZER_NETBSD0
1127#if SANITIZER_FREEBSD0
1128 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
1129#else
1130 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
1131#endif
1132 const char *default_module_name = "kern.proc.pathname";
1133 uptr Size = buf_len;
1134 bool IsErr =
1135 (internal_sysctl(Mib, ARRAY_SIZE(Mib)(sizeof(Mib)/sizeof((Mib)[0])), buf, &Size, NULL__null, 0) != 0);
1136 int readlink_error = IsErr ? errno(*__errno_location ()) : 0;
1137 uptr module_name_len = Size;
1138#else
1139 const char *default_module_name = "/proc/self/exe";
1140 uptr module_name_len = internal_readlink(
1141 default_module_name, buf, buf_len);
1142 int readlink_error;
1143 bool IsErr = internal_iserror(module_name_len, &readlink_error);
1144#endif // SANITIZER_SOLARIS
1145 if (IsErr) {
1146 // We can't read binary name for some reason, assume it's unknown.
1147 Report("WARNING: reading executable name failed with errno %d, "
1148 "some stack frames may not be symbolized\n", readlink_error);
1149 module_name_len = internal_snprintf(buf, buf_len, "%s",
1150 default_module_name);
1151 CHECK_LT(module_name_len, buf_len)do { __sanitizer::u64 v1 = (__sanitizer::u64)((module_name_len
)); __sanitizer::u64 v2 = (__sanitizer::u64)((buf_len)); if (
__builtin_expect(!!(!(v1 < v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1151, "(" "(module_name_len)" ") " "<" " (" "(buf_len)" ")"
, v1, v2); } while (false);
1152 }
1153 return module_name_len;
1154#endif
1155}
1156#endif // !SANITIZER_OPENBSD
1157
1158uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
1159#if SANITIZER_LINUX1
1160 char *tmpbuf;
1161 uptr tmpsize;
1162 uptr tmplen;
1163 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
1164 1024 * 1024)) {
1165 internal_strncpy(buf, tmpbuf, buf_len);
1166 UnmapOrDie(tmpbuf, tmpsize);
1167 return internal_strlen(buf);
1168 }
1169#endif
1170 return ReadBinaryName(buf, buf_len);
1171}
1172
1173// Match full names of the form /path/to/base_name{-,.}*
1174bool LibraryNameIs(const char *full_name, const char *base_name) {
1175 const char *name = full_name;
1176 // Strip path.
1177 while (*name != '\0') name++;
1178 while (name > full_name && *name != '/') name--;
1179 if (*name == '/') name++;
1180 uptr base_name_length = internal_strlen(base_name);
1181 if (internal_strncmp(name, base_name, base_name_length)) return false;
1182 return (name[base_name_length] == '-' || name[base_name_length] == '.');
1183}
1184
1185#if !SANITIZER_ANDROID0
1186// Call cb for each region mapped by map.
1187void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
1188 CHECK_NE(map, nullptr)do { __sanitizer::u64 v1 = (__sanitizer::u64)((map)); __sanitizer
::u64 v2 = (__sanitizer::u64)((nullptr)); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1188, "(" "(map)" ") " "!=" " (" "(nullptr)" ")", v1, v2); }
while (false);
1189#if !SANITIZER_FREEBSD0 && !SANITIZER_OPENBSD0
1190 typedef ElfW(Phdr)Elf64_Phdr Elf_Phdr;
1191 typedef ElfW(Ehdr)Elf64_Ehdr Elf_Ehdr;
1192#endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
1193 char *base = (char *)map->l_addr;
1194 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
1195 char *phdrs = base + ehdr->e_phoff;
1196 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
1197
1198 // Find the segment with the minimum base so we can "relocate" the p_vaddr
1199 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
1200 // objects have a non-zero base.
1201 uptr preferred_base = (uptr)-1;
1202 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
1203 Elf_Phdr *phdr = (Elf_Phdr *)iter;
1204 if (phdr->p_type == PT_LOAD1 && preferred_base > (uptr)phdr->p_vaddr)
1205 preferred_base = (uptr)phdr->p_vaddr;
1206 }
1207
1208 // Compute the delta from the real base to get a relocation delta.
1209 sptr delta = (uptr)base - preferred_base;
1210 // Now we can figure out what the loader really mapped.
1211 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
1212 Elf_Phdr *phdr = (Elf_Phdr *)iter;
1213 if (phdr->p_type == PT_LOAD1) {
1214 uptr seg_start = phdr->p_vaddr + delta;
1215 uptr seg_end = seg_start + phdr->p_memsz;
1216 // None of these values are aligned. We consider the ragged edges of the
1217 // load command as defined, since they are mapped from the file.
1218 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
1219 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
1220 cb((void *)seg_start, seg_end - seg_start);
1221 }
1222 }
1223}
1224#endif
1225
1226#if defined(__x86_64__1) && SANITIZER_LINUX1
1227// We cannot use glibc's clone wrapper, because it messes with the child
1228// task's TLS. It writes the PID and TID of the child task to its thread
1229// descriptor, but in our case the child task shares the thread descriptor with
1230// the parent (because we don't know how to allocate a new thread
1231// descriptor to keep glibc happy). So the stock version of clone(), when
1232// used with CLONE_VM, would end up corrupting the parent's thread descriptor.
1233uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1234 int *parent_tidptr, void *newtls, int *child_tidptr) {
1235 long long res;
1236 if (!fn || !child_stack)
1237 return -EINVAL22;
1238 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1238, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1239 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1240 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1241 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1242 register void *r8 __asm__("r8") = newtls;
1243 register int *r10 __asm__("r10") = child_tidptr;
1244 __asm__ __volatile__(
1245 /* %rax = syscall(%rax = SYSCALL(clone),
1246 * %rdi = flags,
1247 * %rsi = child_stack,
1248 * %rdx = parent_tidptr,
1249 * %r8 = new_tls,
1250 * %r10 = child_tidptr)
1251 */
1252 "syscall\n"
1253
1254 /* if (%rax != 0)
1255 * return;
1256 */
1257 "testq %%rax,%%rax\n"
1258 "jnz 1f\n"
1259
1260 /* In the child. Terminate unwind chain. */
1261 // XXX: We should also terminate the CFI unwind chain
1262 // here. Unfortunately clang 3.2 doesn't support the
1263 // necessary CFI directives, so we skip that part.
1264 "xorq %%rbp,%%rbp\n"
1265
1266 /* Call "fn(arg)". */
1267 "popq %%rax\n"
1268 "popq %%rdi\n"
1269 "call *%%rax\n"
1270
1271 /* Call _exit(%rax). */
1272 "movq %%rax,%%rdi\n"
1273 "movq %2,%%rax\n"
1274 "syscall\n"
1275
1276 /* Return to parent. */
1277 "1:\n"
1278 : "=a" (res)
1279 : "a"(SYSCALL(clone)56), "i"(SYSCALL(exit)60),
1280 "S"(child_stack),
1281 "D"(flags),
1282 "d"(parent_tidptr),
1283 "r"(r8),
1284 "r"(r10)
1285 : "memory", "r11", "rcx");
1286 return res;
1287}
1288#elif defined(__mips__)
1289uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1290 int *parent_tidptr, void *newtls, int *child_tidptr) {
1291 long long res;
1292 if (!fn || !child_stack)
1293 return -EINVAL22;
1294 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1294, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1295 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1296 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1297 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1298 register void *a3 __asm__("$7") = newtls;
1299 register int *a4 __asm__("$8") = child_tidptr;
1300 // We don't have proper CFI directives here because it requires alot of code
1301 // for very marginal benefits.
1302 __asm__ __volatile__(
1303 /* $v0 = syscall($v0 = __NR_clone,
1304 * $a0 = flags,
1305 * $a1 = child_stack,
1306 * $a2 = parent_tidptr,
1307 * $a3 = new_tls,
1308 * $a4 = child_tidptr)
1309 */
1310 ".cprestore 16;\n"
1311 "move $4,%1;\n"
1312 "move $5,%2;\n"
1313 "move $6,%3;\n"
1314 "move $7,%4;\n"
1315 /* Store the fifth argument on stack
1316 * if we are using 32-bit abi.
1317 */
1318#if SANITIZER_WORDSIZE64 == 32
1319 "lw %5,16($29);\n"
1320#else
1321 "move $8,%5;\n"
1322#endif
1323 "li $2,%6;\n"
1324 "syscall;\n"
1325
1326 /* if ($v0 != 0)
1327 * return;
1328 */
1329 "bnez $2,1f;\n"
1330
1331 /* Call "fn(arg)". */
1332#if SANITIZER_WORDSIZE64 == 32
1333#ifdef __BIG_ENDIAN__
1334 "lw $25,4($29);\n"
1335 "lw $4,12($29);\n"
1336#else
1337 "lw $25,0($29);\n"
1338 "lw $4,8($29);\n"
1339#endif
1340#else
1341 "ld $25,0($29);\n"
1342 "ld $4,8($29);\n"
1343#endif
1344 "jal $25;\n"
1345
1346 /* Call _exit($v0). */
1347 "move $4,$2;\n"
1348 "li $2,%7;\n"
1349 "syscall;\n"
1350
1351 /* Return to parent. */
1352 "1:\n"
1353 : "=r" (res)
1354 : "r"(flags),
1355 "r"(child_stack),
1356 "r"(parent_tidptr),
1357 "r"(a3),
1358 "r"(a4),
1359 "i"(__NR_clone56),
1360 "i"(__NR_exit60)
1361 : "memory", "$29" );
1362 return res;
1363}
1364#elif SANITIZER_RISCV640
1365uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1366 int *parent_tidptr, void *newtls, int *child_tidptr) {
1367 long long res;
1368 if (!fn || !child_stack)
1369 return -EINVAL22;
1370 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1370, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1371 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1372 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1373 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1374
1375 register int (*__fn)(void *) __asm__("a0") = fn;
1376 register void *__stack __asm__("a1") = child_stack;
1377 register int __flags __asm__("a2") = flags;
1378 register void *__arg __asm__("a3") = arg;
1379 register int *__ptid __asm__("a4") = parent_tidptr;
1380 register void *__tls __asm__("a5") = newtls;
1381 register int *__ctid __asm__("a6") = child_tidptr;
1382
1383 __asm__ __volatile__(
1384 "mv a0,a2\n" /* flags */
1385 "mv a2,a4\n" /* ptid */
1386 "mv a3,a5\n" /* tls */
1387 "mv a4,a6\n" /* ctid */
1388 "addi a7, zero, %9\n" /* clone */
1389
1390 "ecall\n"
1391
1392 /* if (%r0 != 0)
1393 * return %r0;
1394 */
1395 "bnez a0, 1f\n"
1396
1397 /* In the child, now. Call "fn(arg)". */
1398 "ld a0, 8(sp)\n"
1399 "ld a1, 16(sp)\n"
1400 "jalr a1\n"
1401
1402 /* Call _exit(%r0). */
1403 "addi a7, zero, %10\n"
1404 "ecall\n"
1405 "1:\n"
1406
1407 : "=r"(res)
1408 : "i"(-EINVAL22), "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1409 "r"(__ptid), "r"(__tls), "r"(__ctid), "i"(__NR_clone56), "i"(__NR_exit60)
1410 : "ra", "memory");
1411 return res;
1412}
1413#elif defined(__aarch64__)
1414uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1415 int *parent_tidptr, void *newtls, int *child_tidptr) {
1416 long long res;
1417 if (!fn || !child_stack)
1418 return -EINVAL22;
1419 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1419, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1420 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1421 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1422 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1423
1424 register int (*__fn)(void *) __asm__("x0") = fn;
1425 register void *__stack __asm__("x1") = child_stack;
1426 register int __flags __asm__("x2") = flags;
1427 register void *__arg __asm__("x3") = arg;
1428 register int *__ptid __asm__("x4") = parent_tidptr;
1429 register void *__tls __asm__("x5") = newtls;
1430 register int *__ctid __asm__("x6") = child_tidptr;
1431
1432 __asm__ __volatile__(
1433 "mov x0,x2\n" /* flags */
1434 "mov x2,x4\n" /* ptid */
1435 "mov x3,x5\n" /* tls */
1436 "mov x4,x6\n" /* ctid */
1437 "mov x8,%9\n" /* clone */
1438
1439 "svc 0x0\n"
1440
1441 /* if (%r0 != 0)
1442 * return %r0;
1443 */
1444 "cmp x0, #0\n"
1445 "bne 1f\n"
1446
1447 /* In the child, now. Call "fn(arg)". */
1448 "ldp x1, x0, [sp], #16\n"
1449 "blr x1\n"
1450
1451 /* Call _exit(%r0). */
1452 "mov x8, %10\n"
1453 "svc 0x0\n"
1454 "1:\n"
1455
1456 : "=r" (res)
1457 : "i"(-EINVAL22),
1458 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1459 "r"(__ptid), "r"(__tls), "r"(__ctid),
1460 "i"(__NR_clone56), "i"(__NR_exit60)
1461 : "x30", "memory");
1462 return res;
1463}
1464#elif defined(__powerpc64__)
1465uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1466 int *parent_tidptr, void *newtls, int *child_tidptr) {
1467 long long res;
1468// Stack frame structure.
1469#if SANITIZER_PPC64V10
1470// Back chain == 0 (SP + 112)
1471// Frame (112 bytes):
1472// Parameter save area (SP + 48), 8 doublewords
1473// TOC save area (SP + 40)
1474// Link editor doubleword (SP + 32)
1475// Compiler doubleword (SP + 24)
1476// LR save area (SP + 16)
1477// CR save area (SP + 8)
1478// Back chain (SP + 0)
1479# define FRAME_SIZE 112
1480# define FRAME_TOC_SAVE_OFFSET 40
1481#elif SANITIZER_PPC64V20
1482// Back chain == 0 (SP + 32)
1483// Frame (32 bytes):
1484// TOC save area (SP + 24)
1485// LR save area (SP + 16)
1486// CR save area (SP + 8)
1487// Back chain (SP + 0)
1488# define FRAME_SIZE 32
1489# define FRAME_TOC_SAVE_OFFSET 24
1490#else
1491# error "Unsupported PPC64 ABI"
1492#endif
1493 if (!fn || !child_stack)
1494 return -EINVAL22;
1495 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1495, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1496
1497 register int (*__fn)(void *) __asm__("r3") = fn;
1498 register void *__cstack __asm__("r4") = child_stack;
1499 register int __flags __asm__("r5") = flags;
1500 register void *__arg __asm__("r6") = arg;
1501 register int *__ptidptr __asm__("r7") = parent_tidptr;
1502 register void *__newtls __asm__("r8") = newtls;
1503 register int *__ctidptr __asm__("r9") = child_tidptr;
1504
1505 __asm__ __volatile__(
1506 /* fn and arg are saved across the syscall */
1507 "mr 28, %5\n\t"
1508 "mr 27, %8\n\t"
1509
1510 /* syscall
1511 r0 == __NR_clone
1512 r3 == flags
1513 r4 == child_stack
1514 r5 == parent_tidptr
1515 r6 == newtls
1516 r7 == child_tidptr */
1517 "mr 3, %7\n\t"
1518 "mr 5, %9\n\t"
1519 "mr 6, %10\n\t"
1520 "mr 7, %11\n\t"
1521 "li 0, %3\n\t"
1522 "sc\n\t"
1523
1524 /* Test if syscall was successful */
1525 "cmpdi cr1, 3, 0\n\t"
1526 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
1527 "bne- cr1, 1f\n\t"
1528
1529 /* Set up stack frame */
1530 "li 29, 0\n\t"
1531 "stdu 29, -8(1)\n\t"
1532 "stdu 1, -%12(1)\n\t"
1533 /* Do the function call */
1534 "std 2, %13(1)\n\t"
1535#if SANITIZER_PPC64V10
1536 "ld 0, 0(28)\n\t"
1537 "ld 2, 8(28)\n\t"
1538 "mtctr 0\n\t"
1539#elif SANITIZER_PPC64V20
1540 "mr 12, 28\n\t"
1541 "mtctr 12\n\t"
1542#else
1543# error "Unsupported PPC64 ABI"
1544#endif
1545 "mr 3, 27\n\t"
1546 "bctrl\n\t"
1547 "ld 2, %13(1)\n\t"
1548
1549 /* Call _exit(r3) */
1550 "li 0, %4\n\t"
1551 "sc\n\t"
1552
1553 /* Return to parent */
1554 "1:\n\t"
1555 "mr %0, 3\n\t"
1556 : "=r" (res)
1557 : "0" (-1),
1558 "i" (EINVAL22),
1559 "i" (__NR_clone56),
1560 "i" (__NR_exit60),
1561 "r" (__fn),
1562 "r" (__cstack),
1563 "r" (__flags),
1564 "r" (__arg),
1565 "r" (__ptidptr),
1566 "r" (__newtls),
1567 "r" (__ctidptr),
1568 "i" (FRAME_SIZE),
1569 "i" (FRAME_TOC_SAVE_OFFSET)
1570 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
1571 return res;
1572}
1573#elif defined(__i386__) && SANITIZER_LINUX1
1574uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1575 int *parent_tidptr, void *newtls, int *child_tidptr) {
1576 int res;
1577 if (!fn || !child_stack)
1578 return -EINVAL22;
1579 CHECK_EQ(0, (uptr)child_stack % 16)do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)(((uptr)child_stack % 16)); if (
__builtin_expect(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1579, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1580 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
1581 ((unsigned int *)child_stack)[0] = (uptr)flags;
1582 ((unsigned int *)child_stack)[1] = (uptr)0;
1583 ((unsigned int *)child_stack)[2] = (uptr)fn;
1584 ((unsigned int *)child_stack)[3] = (uptr)arg;
1585 __asm__ __volatile__(
1586 /* %eax = syscall(%eax = SYSCALL(clone),
1587 * %ebx = flags,
1588 * %ecx = child_stack,
1589 * %edx = parent_tidptr,
1590 * %esi = new_tls,
1591 * %edi = child_tidptr)
1592 */
1593
1594 /* Obtain flags */
1595 "movl (%%ecx), %%ebx\n"
1596 /* Do the system call */
1597 "pushl %%ebx\n"
1598 "pushl %%esi\n"
1599 "pushl %%edi\n"
1600 /* Remember the flag value. */
1601 "movl %%ebx, (%%ecx)\n"
1602 "int $0x80\n"
1603 "popl %%edi\n"
1604 "popl %%esi\n"
1605 "popl %%ebx\n"
1606
1607 /* if (%eax != 0)
1608 * return;
1609 */
1610
1611 "test %%eax,%%eax\n"
1612 "jnz 1f\n"
1613
1614 /* terminate the stack frame */
1615 "xorl %%ebp,%%ebp\n"
1616 /* Call FN. */
1617 "call *%%ebx\n"
1618#ifdef PIC
1619 "call here\n"
1620 "here:\n"
1621 "popl %%ebx\n"
1622 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
1623#endif
1624 /* Call exit */
1625 "movl %%eax, %%ebx\n"
1626 "movl %2, %%eax\n"
1627 "int $0x80\n"
1628 "1:\n"
1629 : "=a" (res)
1630 : "a"(SYSCALL(clone)56), "i"(SYSCALL(exit)60),
1631 "c"(child_stack),
1632 "d"(parent_tidptr),
1633 "S"(newtls),
1634 "D"(child_tidptr)
1635 : "memory");
1636 return res;
1637}
1638#elif defined(__arm__) && SANITIZER_LINUX1
1639uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1640 int *parent_tidptr, void *newtls, int *child_tidptr) {
1641 unsigned int res;
1642 if (!fn || !child_stack)
1643 return -EINVAL22;
1644 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
1645 ((unsigned int *)child_stack)[0] = (uptr)fn;
1646 ((unsigned int *)child_stack)[1] = (uptr)arg;
1647 register int r0 __asm__("r0") = flags;
1648 register void *r1 __asm__("r1") = child_stack;
1649 register int *r2 __asm__("r2") = parent_tidptr;
1650 register void *r3 __asm__("r3") = newtls;
1651 register int *r4 __asm__("r4") = child_tidptr;
1652 register int r7 __asm__("r7") = __NR_clone56;
1653
1654#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
1655# define ARCH_HAS_BX
1656#endif
1657#if __ARM_ARCH > 4
1658# define ARCH_HAS_BLX
1659#endif
1660
1661#ifdef ARCH_HAS_BX
1662# ifdef ARCH_HAS_BLX
1663# define BLX(R) "blx " #R "\n"
1664# else
1665# define BLX(R) "mov lr, pc; bx " #R "\n"
1666# endif
1667#else
1668# define BLX(R) "mov lr, pc; mov pc," #R "\n"
1669#endif
1670
1671 __asm__ __volatile__(
1672 /* %r0 = syscall(%r7 = SYSCALL(clone),
1673 * %r0 = flags,
1674 * %r1 = child_stack,
1675 * %r2 = parent_tidptr,
1676 * %r3 = new_tls,
1677 * %r4 = child_tidptr)
1678 */
1679
1680 /* Do the system call */
1681 "swi 0x0\n"
1682
1683 /* if (%r0 != 0)
1684 * return %r0;
1685 */
1686 "cmp r0, #0\n"
1687 "bne 1f\n"
1688
1689 /* In the child, now. Call "fn(arg)". */
1690 "ldr r0, [sp, #4]\n"
1691 "ldr ip, [sp], #8\n"
1692 BLX(ip)
1693 /* Call _exit(%r0). */
1694 "mov r7, %7\n"
1695 "swi 0x0\n"
1696 "1:\n"
1697 "mov %0, r0\n"
1698 : "=r"(res)
1699 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
1700 "i"(__NR_exit60)
1701 : "memory");
1702 return res;
1703}
1704#endif // defined(__x86_64__) && SANITIZER_LINUX
1705
1706#if SANITIZER_LINUX1
1707int internal_uname(struct utsname *buf) {
1708 return internal_syscall(SYSCALL(uname)63, buf);
1709}
1710#endif
1711
1712#if SANITIZER_ANDROID0
1713#if __ANDROID_API__ < 21
1714extern "C" __attribute__((weak)) int dl_iterate_phdr(
1715 int (*)(struct dl_phdr_info *, size_t, void *), void *);
1716#endif
1717
1718static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
1719 void *data) {
1720 // Any name starting with "lib" indicates a bug in L where library base names
1721 // are returned instead of paths.
1722 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
1723 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
1724 *(bool *)data = true;
1725 return 1;
1726 }
1727 return 0;
1728}
1729
1730static atomic_uint32_t android_api_level;
1731
1732static AndroidApiLevel AndroidDetectApiLevelStatic() {
1733#if __ANDROID_API__ <= 19
1734 return ANDROID_KITKAT;
1735#elif __ANDROID_API__ <= 22
1736 return ANDROID_LOLLIPOP_MR1;
1737#else
1738 return ANDROID_POST_LOLLIPOP;
1739#endif
1740}
1741
1742static AndroidApiLevel AndroidDetectApiLevel() {
1743 if (!&dl_iterate_phdr)
1744 return ANDROID_KITKAT; // K or lower
1745 bool base_name_seen = false;
1746 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
1747 if (base_name_seen)
1748 return ANDROID_LOLLIPOP_MR1; // L MR1
1749 return ANDROID_POST_LOLLIPOP; // post-L
1750 // Plain L (API level 21) is completely broken wrt ASan and not very
1751 // interesting to detect.
1752}
1753
1754extern "C" __attribute__((weak)) void* _DYNAMIC;
1755
1756AndroidApiLevel AndroidGetApiLevel() {
1757 AndroidApiLevel level =
1758 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
1759 if (level) return level;
1760 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic()
1761 : AndroidDetectApiLevel();
1762 atomic_store(&android_api_level, level, memory_order_relaxed);
1763 return level;
1764}
1765
1766#endif
1767
1768static HandleSignalMode GetHandleSignalModeImpl(int signum) {
1769 switch (signum) {
1770 case SIGABRT6:
1771 return common_flags()->handle_abort;
1772 case SIGILL4:
1773 return common_flags()->handle_sigill;
1774 case SIGTRAP5:
1775 return common_flags()->handle_sigtrap;
1776 case SIGFPE8:
1777 return common_flags()->handle_sigfpe;
1778 case SIGSEGV11:
1779 return common_flags()->handle_segv;
1780 case SIGBUS7:
1781 return common_flags()->handle_sigbus;
1782 }
1783 return kHandleSignalNo;
1784}
1785
1786HandleSignalMode GetHandleSignalMode(int signum) {
1787 HandleSignalMode result = GetHandleSignalModeImpl(signum);
1788 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
1789 return kHandleSignalExclusive;
1790 return result;
1791}
1792
1793#if !SANITIZER_GO0
1794void *internal_start_thread(void *(*func)(void *arg), void *arg) {
1795 // Start the thread with signals blocked, otherwise it can steal user signals.
1796 __sanitizer_sigset_t set, old;
1797 internal_sigfillset(&set);
1798#if SANITIZER_LINUX1 && !SANITIZER_ANDROID0
1799 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
1800 // on any thread, setuid call hangs (see test/tsan/setuid.c).
1801 internal_sigdelset(&set, 33);
1802#endif
1803 internal_sigprocmask(SIG_SETMASK2, &set, &old);
1804 void *th;
1805 real_pthread_create(&th, nullptr, func, arg);
1806 internal_sigprocmask(SIG_SETMASK2, &old, nullptr);
1807 return th;
1808}
1809
1810void internal_join_thread(void *th) {
1811 real_pthread_join(th, nullptr);
1812}
1813#else
1814void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; }
1815
1816void internal_join_thread(void *th) {}
1817#endif
1818
1819#if defined(__aarch64__)
1820// Android headers in the older NDK releases miss this definition.
1821struct __sanitizer_esr_context {
1822 struct _aarch64_ctx head;
1823 uint64_t esr;
1824};
1825
1826static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
1827 static const u32 kEsrMagic = 0x45535201;
1828 u8 *aux = ucontext->uc_mcontext.__reserved;
1829 while (true) {
1830 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
1831 if (ctx->size == 0) break;
1832 if (ctx->magic == kEsrMagic) {
1833 *esr = ((__sanitizer_esr_context *)ctx)->esr;
1834 return true;
1835 }
1836 aux += ctx->size;
1837 }
1838 return false;
1839}
1840#endif
1841
1842#if SANITIZER_OPENBSD0
1843using Context = sigcontext;
1844#else
1845using Context = ucontext_t;
1846#endif
1847
1848SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
1849 Context *ucontext = (Context *)context;
1850#if defined(__x86_64__1) || defined(__i386__)
1851 static const uptr PF_WRITE = 1U << 1;
1852#if SANITIZER_FREEBSD0
1853 uptr err = ucontext->uc_mcontext.mc_err;
1854#elif SANITIZER_NETBSD0
1855 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR];
1856#elif SANITIZER_OPENBSD0
1857 uptr err = ucontext->sc_err;
1858#elif SANITIZER_SOLARIS0 && defined(__i386__)
1859 const int Err = 13;
1860 uptr err = ucontext->uc_mcontext.gregs[Err];
1861#else
1862 uptr err = ucontext->uc_mcontext.gregs[REG_ERRREG_ERR];
1863#endif // SANITIZER_FREEBSD
1864 return err & PF_WRITE ? WRITE : READ;
1865#elif defined(__mips__)
1866 uint32_t *exception_source;
1867 uint32_t faulty_instruction;
1868 uint32_t op_code;
1869
1870 exception_source = (uint32_t *)ucontext->uc_mcontext.pc;
1871 faulty_instruction = (uint32_t)(*exception_source);
1872
1873 op_code = (faulty_instruction >> 26) & 0x3f;
1874
1875 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions.
1876 switch (op_code) {
1877 case 0x28: // sb
1878 case 0x29: // sh
1879 case 0x2b: // sw
1880 case 0x3f: // sd
1881#if __mips_isa_rev < 6
1882 case 0x2c: // sdl
1883 case 0x2d: // sdr
1884 case 0x2a: // swl
1885 case 0x2e: // swr
1886#endif
1887 return SignalContext::WRITE;
1888
1889 case 0x20: // lb
1890 case 0x24: // lbu
1891 case 0x21: // lh
1892 case 0x25: // lhu
1893 case 0x23: // lw
1894 case 0x27: // lwu
1895 case 0x37: // ld
1896#if __mips_isa_rev < 6
1897 case 0x1a: // ldl
1898 case 0x1b: // ldr
1899 case 0x22: // lwl
1900 case 0x26: // lwr
1901#endif
1902 return SignalContext::READ;
1903#if __mips_isa_rev == 6
1904 case 0x3b: // pcrel
1905 op_code = (faulty_instruction >> 19) & 0x3;
1906 switch (op_code) {
1907 case 0x1: // lwpc
1908 case 0x2: // lwupc
1909 return SignalContext::READ;
1910 }
1911#endif
1912 }
1913 return SignalContext::UNKNOWN;
1914#elif defined(__arm__)
1915 static const uptr FSR_WRITE = 1U << 11;
1916 uptr fsr = ucontext->uc_mcontext.error_code;
1917 return fsr & FSR_WRITE ? WRITE : READ;
1918#elif defined(__aarch64__)
1919 static const u64 ESR_ELx_WNR = 1U << 6;
1920 u64 esr;
1921 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
1922 return esr & ESR_ELx_WNR ? WRITE : READ;
1923#elif defined(__sparc__)
1924 // Decode the instruction to determine the access type.
1925 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype).
1926#if SANITIZER_SOLARIS0
1927 uptr pc = ucontext->uc_mcontext.gregs[REG_PC];
1928#else
1929 // Historical BSDism here.
1930 struct sigcontext *scontext = (struct sigcontext *)context;
1931#if defined(__arch64__)
1932 uptr pc = scontext->sigc_regs.tpc;
1933#else
1934 uptr pc = scontext->si_regs.pc;
1935#endif
1936#endif
1937 u32 instr = *(u32 *)pc;
1938 return (instr >> 21) & 1 ? WRITE: READ;
1939#elif defined(__riscv)
1940 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC];
1941 unsigned faulty_instruction = *(uint16_t *)pc;
1942
1943#if defined(__riscv_compressed)
1944 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction
1945 // set op_bits to the instruction bits [1, 0, 15, 14, 13]
1946 unsigned op_bits =
1947 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13);
1948 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive
1949 switch (op_bits) {
1950 case 0b10'010: // c.lwsp (rd != x0)
1951#if __riscv_xlen == 64
1952 case 0b10'011: // c.ldsp (rd != x0)
1953#endif
1954 return rd ? SignalContext::READ : SignalContext::UNKNOWN;
1955 case 0b00'010: // c.lw
1956#if __riscv_flen >= 32 && __riscv_xlen == 32
1957 case 0b10'011: // c.flwsp
1958#endif
1959#if __riscv_flen >= 32 || __riscv_xlen == 64
1960 case 0b00'011: // c.flw / c.ld
1961#endif
1962#if __riscv_flen == 64
1963 case 0b00'001: // c.fld
1964 case 0b10'001: // c.fldsp
1965#endif
1966 return SignalContext::READ;
1967 case 0b00'110: // c.sw
1968 case 0b10'110: // c.swsp
1969#if __riscv_flen >= 32 || __riscv_xlen == 64
1970 case 0b00'111: // c.fsw / c.sd
1971 case 0b10'111: // c.fswsp / c.sdsp
1972#endif
1973#if __riscv_flen == 64
1974 case 0b00'101: // c.fsd
1975 case 0b10'101: // c.fsdsp
1976#endif
1977 return SignalContext::WRITE;
1978 default:
1979 return SignalContext::UNKNOWN;
1980 }
1981 }
1982#endif
1983
1984 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits
1985 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive
1986 switch (opcode) {
1987 case 0b0000011: // loads
1988 switch (funct3) {
1989 case 0b000: // lb
1990 case 0b001: // lh
1991 case 0b010: // lw
1992#if __riscv_xlen == 64
1993 case 0b011: // ld
1994#endif
1995 case 0b100: // lbu
1996 case 0b101: // lhu
1997 return SignalContext::READ;
1998 default:
1999 return SignalContext::UNKNOWN;
2000 }
2001 case 0b0100011: // stores
2002 switch (funct3) {
2003 case 0b000: // sb
2004 case 0b001: // sh
2005 case 0b010: // sw
2006#if __riscv_xlen == 64
2007 case 0b011: // sd
2008#endif
2009 return SignalContext::WRITE;
2010 default:
2011 return SignalContext::UNKNOWN;
2012 }
2013#if __riscv_flen >= 32
2014 case 0b0000111: // floating-point loads
2015 switch (funct3) {
2016 case 0b010: // flw
2017#if __riscv_flen == 64
2018 case 0b011: // fld
2019#endif
2020 return SignalContext::READ;
2021 default:
2022 return SignalContext::UNKNOWN;
2023 }
2024 case 0b0100111: // floating-point stores
2025 switch (funct3) {
2026 case 0b010: // fsw
2027#if __riscv_flen == 64
2028 case 0b011: // fsd
2029#endif
2030 return SignalContext::WRITE;
2031 default:
2032 return SignalContext::UNKNOWN;
2033 }
2034#endif
2035 default:
2036 return SignalContext::UNKNOWN;
2037 }
2038#else
2039 (void)ucontext;
2040 return UNKNOWN; // FIXME: Implement.
2041#endif
2042}
2043
2044bool SignalContext::IsTrueFaultingAddress() const {
2045 auto si = static_cast<const siginfo_t *>(siginfo);
2046 // SIGSEGV signals without a true fault address have si_code set to 128.
2047 return si->si_signo == SIGSEGV11 && si->si_code != 128;
2048}
2049
2050void SignalContext::DumpAllRegisters(void *context) {
2051 // FIXME: Implement this.
2052}
2053
2054static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
2055#if SANITIZER_NETBSD0
2056 // This covers all NetBSD architectures
2057 ucontext_t *ucontext = (ucontext_t *)context;
2058 *pc = _UC_MACHINE_PC(ucontext);
2059 *bp = _UC_MACHINE_FP(ucontext);
2060 *sp = _UC_MACHINE_SP(ucontext);
2061#elif defined(__arm__)
2062 ucontext_t *ucontext = (ucontext_t*)context;
2063 *pc = ucontext->uc_mcontext.arm_pc;
2064 *bp = ucontext->uc_mcontext.arm_fp;
2065 *sp = ucontext->uc_mcontext.arm_sp;
2066#elif defined(__aarch64__)
2067 ucontext_t *ucontext = (ucontext_t*)context;
2068 *pc = ucontext->uc_mcontext.pc;
2069 *bp = ucontext->uc_mcontext.regs[29];
2070 *sp = ucontext->uc_mcontext.sp;
2071#elif defined(__hppa__)
2072 ucontext_t *ucontext = (ucontext_t*)context;
2073 *pc = ucontext->uc_mcontext.sc_iaoq[0];
2074 /* GCC uses %r3 whenever a frame pointer is needed. */
2075 *bp = ucontext->uc_mcontext.sc_gr[3];
2076 *sp = ucontext->uc_mcontext.sc_gr[30];
2077#elif defined(__x86_64__1)
2078# if SANITIZER_FREEBSD0
2079 ucontext_t *ucontext = (ucontext_t*)context;
2080 *pc = ucontext->uc_mcontext.mc_rip;
2081 *bp = ucontext->uc_mcontext.mc_rbp;
2082 *sp = ucontext->uc_mcontext.mc_rsp;
2083#elif SANITIZER_OPENBSD0
2084 sigcontext *ucontext = (sigcontext *)context;
2085 *pc = ucontext->sc_rip;
2086 *bp = ucontext->sc_rbp;
2087 *sp = ucontext->sc_rsp;
2088# else
2089 ucontext_t *ucontext = (ucontext_t*)context;
2090 *pc = ucontext->uc_mcontext.gregs[REG_RIPREG_RIP];
2091 *bp = ucontext->uc_mcontext.gregs[REG_RBPREG_RBP];
2092 *sp = ucontext->uc_mcontext.gregs[REG_RSPREG_RSP];
2093# endif
2094#elif defined(__i386__)
2095# if SANITIZER_FREEBSD0
2096 ucontext_t *ucontext = (ucontext_t*)context;
2097 *pc = ucontext->uc_mcontext.mc_eip;
2098 *bp = ucontext->uc_mcontext.mc_ebp;
2099 *sp = ucontext->uc_mcontext.mc_esp;
2100#elif SANITIZER_OPENBSD0
2101 sigcontext *ucontext = (sigcontext *)context;
2102 *pc = ucontext->sc_eip;
2103 *bp = ucontext->sc_ebp;
2104 *sp = ucontext->sc_esp;
2105# else
2106 ucontext_t *ucontext = (ucontext_t*)context;
2107# if SANITIZER_SOLARIS0
2108 /* Use the numeric values: the symbolic ones are undefined by llvm
2109 include/llvm/Support/Solaris.h. */
2110# ifndef REG_EIP
2111# define REG_EIP 14 // REG_PC
2112# endif
2113# ifndef REG_EBP
2114# define REG_EBP 6 // REG_FP
2115# endif
2116# ifndef REG_UESP
2117# define REG_UESP 17 // REG_SP
2118# endif
2119# endif
2120 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
2121 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
2122 *sp = ucontext->uc_mcontext.gregs[REG_UESP];
2123# endif
2124#elif defined(__powerpc__) || defined(__powerpc64__)
2125 ucontext_t *ucontext = (ucontext_t*)context;
2126 *pc = ucontext->uc_mcontext.regs->nip;
2127 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
2128 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
2129 // pointer, but GCC always uses r31 when we need a frame pointer.
2130 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
2131#elif defined(__sparc__)
2132#if defined(__arch64__) || defined(__sparcv9)
2133#define STACK_BIAS 2047
2134#else
2135#define STACK_BIAS 0
2136# endif
2137# if SANITIZER_SOLARIS0
2138 ucontext_t *ucontext = (ucontext_t *)context;
2139 *pc = ucontext->uc_mcontext.gregs[REG_PC];
2140 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS;
2141#else
2142 // Historical BSDism here.
2143 struct sigcontext *scontext = (struct sigcontext *)context;
2144#if defined(__arch64__)
2145 *pc = scontext->sigc_regs.tpc;
2146 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS;
2147#else
2148 *pc = scontext->si_regs.pc;
2149 *sp = scontext->si_regs.u_regs[14];
2150#endif
2151# endif
2152 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS;
2153#elif defined(__mips__)
2154 ucontext_t *ucontext = (ucontext_t*)context;
2155 *pc = ucontext->uc_mcontext.pc;
2156 *bp = ucontext->uc_mcontext.gregs[30];
2157 *sp = ucontext->uc_mcontext.gregs[29];
2158#elif defined(__s390__)
2159 ucontext_t *ucontext = (ucontext_t*)context;
2160# if defined(__s390x__)
2161 *pc = ucontext->uc_mcontext.psw.addr;
2162# else
2163 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
2164# endif
2165 *bp = ucontext->uc_mcontext.gregs[11];
2166 *sp = ucontext->uc_mcontext.gregs[15];
2167#elif defined(__riscv)
2168 ucontext_t *ucontext = (ucontext_t*)context;
2169 *pc = ucontext->uc_mcontext.__gregs[REG_PC];
2170 *bp = ucontext->uc_mcontext.__gregs[REG_S0];
2171 *sp = ucontext->uc_mcontext.__gregs[REG_SP];
2172#else
2173# error "Unsupported arch"
2174#endif
2175}
2176
2177void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
2178
2179void InitializePlatformEarly() {
2180 // Do nothing.
2181}
2182
2183void MaybeReexec() {
2184 // No need to re-exec on Linux.
2185}
2186
2187void CheckASLR() {
2188#if SANITIZER_NETBSD0
2189 int mib[3];
2190 int paxflags;
2191 uptr len = sizeof(paxflags);
2192
2193 mib[0] = CTL_PROC;
2194 mib[1] = internal_getpid();
2195 mib[2] = PROC_PID_PAXFLAGS;
2196
2197 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctl(mib, 3, &paxflags, &
len, __null, 0) == -1), 0)) {
2198 Printf("sysctl failed\n");
2199 Die();
2200 }
2201
2202 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)__builtin_expect(!!(paxflags & CTL_PROC_PAXFLAGS_ASLR), 0
)) {
2203 Printf("This sanitizer is not compatible with enabled ASLR.\n"
2204 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n",
2205 GetArgv()[0]);
2206 Die();
2207 }
2208#elif SANITIZER_PPC64V20
2209 // Disable ASLR for Linux PPC64LE.
2210 int old_personality = personality(0xffffffff);
2211 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
2212 VReport(1, "WARNING: Program is being run with address space layout "do { if ((uptr)Verbosity() >= (1)) Report("WARNING: Program is being run with address space layout "
"randomization (ASLR) enabled which prevents the thread and "
"memory sanitizers from working on powerpc64le.\n" "ASLR will be disabled and the program re-executed.\n"
); } while (0)
2213 "randomization (ASLR) enabled which prevents the thread and "do { if ((uptr)Verbosity() >= (1)) Report("WARNING: Program is being run with address space layout "
"randomization (ASLR) enabled which prevents the thread and "
"memory sanitizers from working on powerpc64le.\n" "ASLR will be disabled and the program re-executed.\n"
); } while (0)
2214 "memory sanitizers from working on powerpc64le.\n"do { if ((uptr)Verbosity() >= (1)) Report("WARNING: Program is being run with address space layout "
"randomization (ASLR) enabled which prevents the thread and "
"memory sanitizers from working on powerpc64le.\n" "ASLR will be disabled and the program re-executed.\n"
); } while (0)
2215 "ASLR will be disabled and the program re-executed.\n")do { if ((uptr)Verbosity() >= (1)) Report("WARNING: Program is being run with address space layout "
"randomization (ASLR) enabled which prevents the thread and "
"memory sanitizers from working on powerpc64le.\n" "ASLR will be disabled and the program re-executed.\n"
); } while (0);
2216 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1)do { __sanitizer::u64 v1 = (__sanitizer::u64)((personality(old_personality
| ADDR_NO_RANDOMIZE))); __sanitizer::u64 v2 = (__sanitizer::
u64)((-1)); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 2216, "(" "(personality(old_personality | ADDR_NO_RANDOMIZE))"
") " "!=" " (" "(-1)" ")", v1, v2); } while (false);
2217 ReExec();
2218 }
2219#elif SANITIZER_FREEBSD0
2220 int aslr_pie;
2221 uptr len = sizeof(aslr_pie);
2222#if SANITIZER_WORDSIZE64 == 64
2223 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable",__builtin_expect(!!(internal_sysctlbyname("kern.elf64.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)
2224 &aslr_pie, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctlbyname("kern.elf64.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)) {
2225 // We're making things less 'dramatic' here since
2226 // the OID is not necessarily guaranteed to be here
2227 // just yet regarding FreeBSD release
2228 return;
2229 }
2230
2231 if (aslr_pie > 0) {
2232 Printf("This sanitizer is not compatible with enabled ASLR "
2233 "and binaries compiled with PIE\n");
2234 Die();
2235 }
2236#endif
2237 // there might be 32 bits compat for 64 bits
2238 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable",__builtin_expect(!!(internal_sysctlbyname("kern.elf32.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)
2239 &aslr_pie, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctlbyname("kern.elf32.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)) {
2240 return;
2241 }
2242
2243 if (aslr_pie > 0) {
2244 Printf("This sanitizer is not compatible with enabled ASLR "
2245 "and binaries compiled with PIE\n");
2246 Die();
2247 }
2248#else
2249 // Do nothing
2250#endif
2251}
2252
2253void CheckMPROTECT() {
2254#if SANITIZER_NETBSD0
2255 int mib[3];
2256 int paxflags;
2257 uptr len = sizeof(paxflags);
2258
2259 mib[0] = CTL_PROC;
2260 mib[1] = internal_getpid();
2261 mib[2] = PROC_PID_PAXFLAGS;
2262
2263 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctl(mib, 3, &paxflags, &
len, __null, 0) == -1), 0)) {
2264 Printf("sysctl failed\n");
2265 Die();
2266 }
2267
2268 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)__builtin_expect(!!(paxflags & CTL_PROC_PAXFLAGS_MPROTECT
), 0)) {
2269 Printf("This sanitizer is not compatible with enabled MPROTECT\n");
2270 Die();
2271 }
2272#else
2273 // Do nothing
2274#endif
2275}
2276
2277void PrintModuleMap() { }
2278
2279void CheckNoDeepBind(const char *filename, int flag) {
2280#ifdef RTLD_DEEPBIND0x00008
2281 if (flag & RTLD_DEEPBIND0x00008) {
2282 Report(
2283 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
2284 " which is incompatible with sanitizer runtime "
2285 "(see https://github.com/google/sanitizers/issues/611 for details"
2286 "). If you want to run %s library under sanitizers please remove "
2287 "RTLD_DEEPBIND from dlopen flags.\n",
2288 filename, filename);
2289 Die();
2290 }
2291#endif
2292}
2293
2294uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
2295 uptr *largest_gap_found,
2296 uptr *max_occupied_addr) {
2297 UNREACHABLE("FindAvailableMemoryRange is not available")do { do { __sanitizer::u64 v1 = (__sanitizer::u64)((0 &&
"FindAvailableMemoryRange is not available")); __sanitizer::
u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1 !=
v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 2297, "(" "(0 && \"FindAvailableMemoryRange is not available\")"
") " "!=" " (" "0" ")", v1, v2); } while (false); Die(); } while
(0);
2298 return 0;
2299}
2300
2301bool GetRandom(void *buffer, uptr length, bool blocking) {
2302 if (!buffer || !length || length > 256)
2303 return false;
2304#if SANITIZER_USE_GETENTROPY0
2305 uptr rnd = getentropy(buffer, length);
2306 int rverrno = 0;
2307 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT14)
2308 return false;
2309 else if (rnd == 0)
2310 return true;
2311#endif // SANITIZER_USE_GETENTROPY
2312
2313#if SANITIZER_USE_GETRANDOM1
2314 static atomic_uint8_t skip_getrandom_syscall;
2315 if (!atomic_load_relaxed(&skip_getrandom_syscall)) {
2316 // Up to 256 bytes, getrandom will not be interrupted.
2317 uptr res = internal_syscall(SYSCALL(getrandom)318, buffer, length,
2318 blocking ? 0 : GRND_NONBLOCK1);
2319 int rverrno = 0;
2320 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS38)
2321 atomic_store_relaxed(&skip_getrandom_syscall, 1);
2322 else if (res == length)
2323 return true;
2324 }
2325#endif // SANITIZER_USE_GETRANDOM
2326 // Up to 256 bytes, a read off /dev/urandom will not be interrupted.
2327 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom.
2328 uptr fd = internal_open("/dev/urandom", O_RDONLY00);
2329 if (internal_iserror(fd))
2330 return false;
2331 uptr res = internal_read(fd, buffer, length);
2332 if (internal_iserror(res))
2333 return false;
2334 internal_close(fd);
2335 return true;
2336}
2337
2338} // namespace __sanitizer
2339
2340#endif
←

/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/compiler-rt/lib/sanitizer_common/sanitizer_syscall_linux_x86_64.inc

1//===-- sanitizer_syscall_linux_x86_64.inc ----------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Implementations of internal_syscall and internal_iserror for Linux/x86_64.
10//
11//===----------------------------------------------------------------------===//
12
13#define SYSCALL(name)__NR_name __NR_ ## name
14
15static uptr internal_syscall(u64 nr) {
16 u64 retval;
17 asm volatile("syscall" : "=a"(retval) : "a"(nr) : "rcx", "r11",
18 "memory", "cc");
19 return retval;
20}
21
22template <typename T1>
23static uptr internal_syscall(u64 nr, T1 arg1) {
24 u64 retval;
25 asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1) :
26 "rcx", "r11", "memory", "cc");
27 return retval;
28}
29
30template <typename T1, typename T2>
31static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2) {
32 u64 retval;
33 asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
34 "S"((u64)arg2) : "rcx", "r11", "memory", "cc");
35 return retval;
3
←
Returning without writing to 'arg2->st_size'
→
36}
37
38template <typename T1, typename T2, typename T3>
39static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3) {
40 u64 retval;
41 asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
42 "S"((u64)arg2), "d"((u64)arg3) : "rcx", "r11", "memory", "cc");
43 return retval;
44}
45
46template <typename T1, typename T2, typename T3, typename T4>
47static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4) {
48 u64 retval;
49 asm volatile("mov %5, %%r10;"
50 "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
51 "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4) :
52 "rcx", "r11", "r10", "memory", "cc");
53 return retval;
54}
55
56template <typename T1, typename T2, typename T3, typename T4, typename T5>
57static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
58 T5 arg5) {
59 u64 retval;
60 asm volatile("mov %5, %%r10;"
61 "mov %6, %%r8;"
62 "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
63 "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5) :
64 "rcx", "r11", "r10", "r8", "memory", "cc");
65 return retval;
66}
67
68template <typename T1, typename T2, typename T3, typename T4, typename T5,
69 typename T6>
70static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
71 T5 arg5, T6 arg6) {
72 u64 retval;
73 asm volatile("mov %5, %%r10;"
74 "mov %6, %%r8;"
75 "mov %7, %%r9;"
76 "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
77 "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5),
78 "r"((u64)arg6) : "rcx", "r11", "r10", "r8", "r9",
79 "memory", "cc");
80 return retval;
81}
82
83bool internal_iserror(uptr retval, int *rverrno) {
84 if (retval >= (uptr)-4095) {
85 if (rverrno)
86 *rverrno = -retval;
87 return true;
88 }
89 return false;
90}