Bug Summary

File:compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
Warning:line 387, 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 -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/projects/compiler-rt/lib/sanitizer_common -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -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-14~++20210828111110+16086d47c0d0/build-llvm/projects/compiler-rt/lib/sanitizer_common -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/include -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/.. -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/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-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-unused-parameter -Wno-variadic-macros -Wno-format-pedantic -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/projects/compiler-rt/lib/sanitizer_common -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0=. -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 -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-08-28-193554-24367-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/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_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#if SANITIZER_GO0
42#undef st_atimest_atim.tv_sec
43#undef st_mtimest_mtim.tv_sec
44#undef st_ctimest_ctim.tv_sec
45#define st_atimest_atim.tv_sec st_atim
46#define st_mtimest_mtim.tv_sec st_mtim
47#define st_ctimest_ctim.tv_sec st_ctim
48#endif
49#include <asm/stat.h>
50#undef stat
51#endif
52
53#include <dlfcn.h>
54#include <errno(*__errno_location ()).h>
55#include <fcntl.h>
56#include <link.h>
57#include <pthread.h>
58#include <sched.h>
59#include <signal.h>
60#include <sys/mman.h>
61#include <sys/param.h>
62#if !SANITIZER_SOLARIS0
63#include <sys/ptrace.h>
64#endif
65#include <sys/resource.h>
66#include <sys/stat.h>
67#include <sys/syscall.h>
68#include <sys/time.h>
69#include <sys/types.h>
70#include <ucontext.h>
71#include <unistd.h>
72
73#if SANITIZER_LINUX1
74#include <sys/utsname.h>
75#endif
76
77#if SANITIZER_LINUX1 && !SANITIZER_ANDROID0
78#include <sys/personality.h>
79#endif
80
81#if SANITIZER_FREEBSD0
82#include <sys/exec.h>
83#include <sys/sysctl.h>
84#include <machine/atomic.h>
85extern "C" {
86// <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
87// FreeBSD 9.2 and 10.0.
88#include <sys/umtx.h>
89}
90#include <sys/thr.h>
91#endif // SANITIZER_FREEBSD
92
93#if SANITIZER_NETBSD0
94#include <limits.h> // For NAME_MAX
95#include <sys/sysctl.h>
96#include <sys/exec.h>
97extern struct ps_strings *__ps_strings;
98#endif // SANITIZER_NETBSD
99
100#if SANITIZER_SOLARIS0
101#include <stdlib.h>
102#include <thread.h>
103#define environ _environ
104#endif
105
106extern char **environ;
107
108#if SANITIZER_LINUX1
109// <linux/time.h>
110struct kernel_timeval {
111 long tv_sec;
112 long tv_usec;
113};
114
115// <linux/futex.h> is broken on some linux distributions.
116const int FUTEX_WAIT = 0;
117const int FUTEX_WAKE = 1;
118const int FUTEX_PRIVATE_FLAG = 128;
119const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG;
120const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG;
121#endif // SANITIZER_LINUX
122
123// Are we using 32-bit or 64-bit Linux syscalls?
124// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
125// but it still needs to use 64-bit syscalls.
126#if SANITIZER_LINUX1 && (defined(__x86_64__1) || defined(__powerpc64__) || \
127 SANITIZER_WORDSIZE64 == 64)
128# define SANITIZER_LINUX_USES_64BIT_SYSCALLS1 1
129#else
130# define SANITIZER_LINUX_USES_64BIT_SYSCALLS1 0
131#endif
132
133// Note : FreeBSD had implemented both
134// Linux apis, available from
135// future 12.x version most likely
136#if SANITIZER_LINUX1 && defined(__NR_getrandom318)
137# if !defined(GRND_NONBLOCK1)
138# define GRND_NONBLOCK1 1
139# endif
140# define SANITIZER_USE_GETRANDOM1 1
141#else
142# define SANITIZER_USE_GETRANDOM1 0
143#endif // SANITIZER_LINUX && defined(__NR_getrandom)
144
145#if SANITIZER_FREEBSD0 && __FreeBSD_version >= 1200000
146# define SANITIZER_USE_GETENTROPY0 1
147#else
148# define SANITIZER_USE_GETENTROPY0 0
149#endif
150
151namespace __sanitizer {
152
153#if SANITIZER_LINUX1 && defined(__x86_64__1)
154#include "sanitizer_syscall_linux_x86_64.inc"
155#elif SANITIZER_LINUX1 && SANITIZER_RISCV640
156#include "sanitizer_syscall_linux_riscv64.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# elif SANITIZER_LINUX1 && defined(__hexagon__)
162# include "sanitizer_syscall_linux_hexagon.inc"
163# else
164# include "sanitizer_syscall_generic.inc"
165# endif
166
167// --------------- sanitizer_libc.h
168#if !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
169#if !SANITIZER_S3900
170uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
171 u64 offset) {
172#if SANITIZER_FREEBSD0 || SANITIZER_LINUX_USES_64BIT_SYSCALLS1
173 return internal_syscall(SYSCALL(mmap)9, (uptr)addr, length, prot, flags, fd,
174 offset);
175#else
176 // mmap2 specifies file offset in 4096-byte units.
177 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 177, "(" "(IsAligned(offset, 4096))" ") " "!=" " (" "0" ")"
, v1, v2); } while (false);
178 return internal_syscall(SYSCALL(mmap2)__NR_mmap2, addr, length, prot, flags, fd,
179 offset / 4096);
180#endif
181}
182#endif // !SANITIZER_S390
183
184uptr internal_munmap(void *addr, uptr length) {
185 return internal_syscall(SYSCALL(munmap)11, (uptr)addr, length);
186}
187
188#if SANITIZER_LINUX1
189uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags,
190 void *new_address) {
191 return internal_syscall(SYSCALL(mremap)25, (uptr)old_address, old_size,
192 new_size, flags, (uptr)new_address);
193}
194#endif
195
196int internal_mprotect(void *addr, uptr length, int prot) {
197 return internal_syscall(SYSCALL(mprotect)10, (uptr)addr, length, prot);
198}
199
200int internal_madvise(uptr addr, uptr length, int advice) {
201 return internal_syscall(SYSCALL(madvise)28, addr, length, advice);
202}
203
204uptr internal_close(fd_t fd) {
205 return internal_syscall(SYSCALL(close)3, fd);
206}
207
208uptr internal_open(const char *filename, int flags) {
209#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
210 return internal_syscall(SYSCALL(openat)257, AT_FDCWD-100, (uptr)filename, flags);
211#else
212 return internal_syscall(SYSCALL(open)2, (uptr)filename, flags);
213#endif
214}
215
216uptr internal_open(const char *filename, int flags, u32 mode) {
217#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
218 return internal_syscall(SYSCALL(openat)257, AT_FDCWD-100, (uptr)filename, flags,
219 mode);
220#else
221 return internal_syscall(SYSCALL(open)2, (uptr)filename, flags, mode);
222#endif
223}
224
225uptr internal_read(fd_t fd, void *buf, uptr count) {
226 sptr res;
227 HANDLE_EINTR(res,{ int rverrno; do { res = ((sptr)internal_syscall(0, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); }
228 (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); };
229 return res;
230}
231
232uptr internal_write(fd_t fd, const void *buf, uptr count) {
233 sptr res;
234 HANDLE_EINTR(res,{ int rverrno; do { res = ((sptr)internal_syscall(1, fd, (uptr
)buf, count)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); }
235 (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); };
236 return res;
237}
238
239uptr internal_ftruncate(fd_t fd, uptr size) {
240 sptr res;
241 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); }
242 (OFF_T)size)){ int rverrno; do { res = ((sptr)internal_syscall(77, fd, (OFF_T
)size)); } while (internal_iserror(res, &rverrno) &&
rverrno == 4); };
243 return res;
244}
245
246#if !SANITIZER_LINUX_USES_64BIT_SYSCALLS1 && SANITIZER_LINUX1
247static void stat64_to_stat(struct stat64 *in, struct stat *out) {
248 internal_memset(out, 0, sizeof(*out));
249 out->st_dev = in->st_dev;
250 out->st_ino = in->st_ino;
251 out->st_mode = in->st_mode;
252 out->st_nlink = in->st_nlink;
253 out->st_uid = in->st_uid;
254 out->st_gid = in->st_gid;
255 out->st_rdev = in->st_rdev;
256 out->st_size = in->st_size;
257 out->st_blksize = in->st_blksize;
258 out->st_blocks = in->st_blocks;
259 out->st_atimest_atim.tv_sec = in->st_atimest_atim.tv_sec;
260 out->st_mtimest_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
261 out->st_ctimest_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
262}
263#endif
264
265#if defined(__mips64)
266// Undefine compatibility macros from <sys/stat.h>
267// so that they would not clash with the kernel_stat
268// st_[a|m|c]time fields
269#if !SANITIZER_GO0
270#undef st_atimest_atim.tv_sec
271#undef st_mtimest_mtim.tv_sec
272#undef st_ctimest_ctim.tv_sec
273#endif
274#if defined(SANITIZER_ANDROID0)
275// Bionic sys/stat.h defines additional macros
276// for compatibility with the old NDKs and
277// they clash with the kernel_stat structure
278// st_[a|m|c]time_nsec fields.
279#undef st_atime_nsec
280#undef st_mtime_nsec
281#undef st_ctime_nsec
282#endif
283static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
284 internal_memset(out, 0, sizeof(*out));
285 out->st_dev = in->st_dev;
286 out->st_ino = in->st_ino;
287 out->st_mode = in->st_mode;
288 out->st_nlink = in->st_nlink;
289 out->st_uid = in->st_uid;
290 out->st_gid = in->st_gid;
291 out->st_rdev = in->st_rdev;
292 out->st_size = in->st_size;
293 out->st_blksize = in->st_blksize;
294 out->st_blocks = in->st_blocks;
295#if defined(__USE_MISC1) || \
296 defined(__USE_XOPEN2K81) || \
297 defined(SANITIZER_ANDROID0)
298 out->st_atim.tv_sec = in->st_atimest_atim.tv_sec;
299 out->st_atim.tv_nsec = in->st_atime_nsec;
300 out->st_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
301 out->st_mtim.tv_nsec = in->st_mtime_nsec;
302 out->st_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
303 out->st_ctim.tv_nsec = in->st_ctime_nsec;
304#else
305 out->st_atimest_atim.tv_sec = in->st_atimest_atim.tv_sec;
306 out->st_atimensec = in->st_atime_nsec;
307 out->st_mtimest_mtim.tv_sec = in->st_mtimest_mtim.tv_sec;
308 out->st_mtimensec = in->st_mtime_nsec;
309 out->st_ctimest_ctim.tv_sec = in->st_ctimest_ctim.tv_sec;
310 out->st_atimensec = in->st_ctime_nsec;
311#endif
312}
313#endif
314
315uptr internal_stat(const char *path, void *buf) {
316#if SANITIZER_FREEBSD0
317 return internal_syscall(SYSCALL(fstatat)__NR_fstatat, AT_FDCWD-100, (uptr)path, (uptr)buf, 0);
318#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
319 return internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, (uptr)path, (uptr)buf,
320 0);
321#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS1
322# if defined(__mips64)
323 // For mips64, stat syscall fills buffer in the format of kernel_stat
324 struct kernel_stat kbuf;
325 int res = internal_syscall(SYSCALL(stat)4, path, &kbuf);
326 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
327 return res;
328# else
329 return internal_syscall(SYSCALL(stat)4, (uptr)path, (uptr)buf);
330# endif
331#else
332 struct stat64 buf64;
333 int res = internal_syscall(SYSCALL(stat64)__NR_stat64, path, &buf64);
334 stat64_to_stat(&buf64, (struct stat *)buf);
335 return res;
336#endif
337}
338
339uptr internal_lstat(const char *path, void *buf) {
340#if SANITIZER_FREEBSD0
341 return internal_syscall(SYSCALL(fstatat)__NR_fstatat, AT_FDCWD-100, (uptr)path, (uptr)buf,
342 AT_SYMLINK_NOFOLLOW0x100);
343#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
344 return internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, (uptr)path, (uptr)buf,
345 AT_SYMLINK_NOFOLLOW0x100);
346#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS1
347# if SANITIZER_MIPS640
348 // For mips64, lstat syscall fills buffer in the format of kernel_stat
349 struct kernel_stat kbuf;
350 int res = internal_syscall(SYSCALL(lstat)6, path, &kbuf);
351 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
352 return res;
353# else
354 return internal_syscall(SYSCALL(lstat)6, (uptr)path, (uptr)buf);
355# endif
356#else
357 struct stat64 buf64;
358 int res = internal_syscall(SYSCALL(lstat64)__NR_lstat64, path, &buf64);
359 stat64_to_stat(&buf64, (struct stat *)buf);
360 return res;
361#endif
362}
363
364uptr internal_fstat(fd_t fd, void *buf) {
365#if SANITIZER_FREEBSD0 || SANITIZER_LINUX_USES_64BIT_SYSCALLS1
366#if SANITIZER_MIPS640
367 // For mips64, fstat syscall fills buffer in the format of kernel_stat
368 struct kernel_stat kbuf;
369 int res = internal_syscall(SYSCALL(fstat)5, fd, &kbuf);
370 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
371 return res;
372# else
373 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'
→
374# endif
375#else
376 struct stat64 buf64;
377 int res = internal_syscall(SYSCALL(fstat64)__NR_fstat64, fd, &buf64);
378 stat64_to_stat(&buf64, (struct stat *)buf);
379 return res;
380#endif
381}
382
383uptr internal_filesize(fd_t fd) {
384 struct stat st;
385 if (internal_fstat(fd, &st))
1
Calling 'internal_fstat'
→
6
←
Returning from 'internal_fstat'
→
7
←
Assuming the condition is false
→
8
←
Taking false branch
→
386 return -1;
387 return (uptr)st.st_size;
9
←
Undefined or garbage value returned to caller
388}
389
390uptr internal_dup(int oldfd) {
391 return internal_syscall(SYSCALL(dup)32, oldfd);
392}
393
394uptr internal_dup2(int oldfd, int newfd) {
395#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
396 return internal_syscall(SYSCALL(dup3)292, oldfd, newfd, 0);
397#else
398 return internal_syscall(SYSCALL(dup2)33, oldfd, newfd);
399#endif
400}
401
402uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
403#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
404 return internal_syscall(SYSCALL(readlinkat)267, AT_FDCWD-100, (uptr)path, (uptr)buf,
405 bufsize);
406#else
407 return internal_syscall(SYSCALL(readlink)89, (uptr)path, (uptr)buf, bufsize);
408#endif
409}
410
411uptr internal_unlink(const char *path) {
412#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
413 return internal_syscall(SYSCALL(unlinkat)263, AT_FDCWD-100, (uptr)path, 0);
414#else
415 return internal_syscall(SYSCALL(unlink)87, (uptr)path);
416#endif
417}
418
419uptr internal_rename(const char *oldpath, const char *newpath) {
420#if defined(__riscv) && defined(__linux__1)
421 return internal_syscall(SYSCALL(renameat2)316, AT_FDCWD-100, (uptr)oldpath, AT_FDCWD-100,
422 (uptr)newpath, 0);
423#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
424 return internal_syscall(SYSCALL(renameat)264, AT_FDCWD-100, (uptr)oldpath, AT_FDCWD-100,
425 (uptr)newpath);
426#else
427 return internal_syscall(SYSCALL(rename)82, (uptr)oldpath, (uptr)newpath);
428#endif
429}
430
431uptr internal_sched_yield() {
432 return internal_syscall(SYSCALL(sched_yield)24);
433}
434
435void internal_usleep(u64 useconds) {
436 struct timespec ts;
437 ts.tv_sec = useconds / 1000000;
438 ts.tv_nsec = (useconds % 1000000) * 1000;
439 internal_syscall(SYSCALL(nanosleep)35, &ts, &ts);
440}
441
442uptr internal_execve(const char *filename, char *const argv[],
443 char *const envp[]) {
444 return internal_syscall(SYSCALL(execve)59, (uptr)filename, (uptr)argv,
445 (uptr)envp);
446}
447#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
448
449#if !SANITIZER_NETBSD0
450void internal__exit(int exitcode) {
451#if SANITIZER_FREEBSD0 || SANITIZER_SOLARIS0
452 internal_syscall(SYSCALL(exit)60, exitcode);
453#else
454 internal_syscall(SYSCALL(exit_group)231, exitcode);
455#endif
456 Die(); // Unreachable.
457}
458#endif // !SANITIZER_NETBSD
459
460// ----------------- sanitizer_common.h
461bool FileExists(const char *filename) {
462 if (ShouldMockFailureToOpen(filename))
463 return false;
464 struct stat st;
465#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
466 if (internal_syscall(SYSCALL(newfstatat)262, AT_FDCWD-100, filename, &st, 0))
467#else
468 if (internal_stat(filename, &st))
469#endif
470 return false;
471 // Sanity check: filename is a regular file.
472 return S_ISREG(st.st_mode)((((st.st_mode)) & 0170000) == (0100000));
473}
474
475#if !SANITIZER_NETBSD0
476tid_t GetTid() {
477#if SANITIZER_FREEBSD0
478 long Tid;
479 thr_self(&Tid);
480 return Tid;
481#elif SANITIZER_SOLARIS0
482 return thr_self();
483#else
484 return internal_syscall(SYSCALL(gettid)186);
485#endif
486}
487
488int TgKill(pid_t pid, tid_t tid, int sig) {
489#if SANITIZER_LINUX1
490 return internal_syscall(SYSCALL(tgkill)234, pid, tid, sig);
491#elif SANITIZER_FREEBSD0
492 return internal_syscall(SYSCALL(thr_kill2)__NR_thr_kill2, pid, tid, sig);
493#elif SANITIZER_SOLARIS0
494 (void)pid;
495 return thr_kill(tid, sig);
496#endif
497}
498#endif
499
500#if SANITIZER_GLIBC1
501u64 NanoTime() {
502 kernel_timeval tv;
503 internal_memset(&tv, 0, sizeof(tv));
504 internal_syscall(SYSCALL(gettimeofday)96, &tv, 0);
505 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000;
506}
507// Used by real_clock_gettime.
508uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) {
509 return internal_syscall(SYSCALL(clock_gettime)228, clk_id, tp);
510}
511#elif !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
512u64 NanoTime() {
513 struct timespec ts;
514 clock_gettime(CLOCK_REALTIME0, &ts);
515 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
516}
517#endif
518
519// Like getenv, but reads env directly from /proc (on Linux) or parses the
520// 'environ' array (on some others) and does not use libc. This function
521// should be called first inside __asan_init.
522const char *GetEnv(const char *name) {
523#if SANITIZER_FREEBSD0 || SANITIZER_NETBSD0 || SANITIZER_SOLARIS0
524 if (::environ != 0) {
525 uptr NameLen = internal_strlen(name);
526 for (char **Env = ::environ; *Env != 0; Env++) {
527 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
528 return (*Env) + NameLen + 1;
529 }
530 }
531 return 0; // Not found.
532#elif SANITIZER_LINUX1
533 static char *environ;
534 static uptr len;
535 static bool inited;
536 if (!inited) {
537 inited = true;
538 uptr environ_size;
539 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
540 environ = nullptr;
541 }
542 if (!environ || len == 0) return nullptr;
543 uptr namelen = internal_strlen(name);
544 const char *p = environ;
545 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
546 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
547 const char* endp =
548 (char*)internal_memchr(p, '\0', len - (p - environ));
549 if (!endp) // this entry isn't NUL terminated
550 return nullptr;
551 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
552 return p + namelen + 1; // point after =
553 p = endp + 1;
554 }
555 return nullptr; // Not found.
556#else
557#error "Unsupported platform"
558#endif
559}
560
561#if !SANITIZER_FREEBSD0 && !SANITIZER_NETBSD0 && !SANITIZER_GO0
562extern "C" {
563SANITIZER_WEAK_ATTRIBUTE__attribute__((weak)) extern void *__libc_stack_end;
564}
565#endif
566
567#if !SANITIZER_FREEBSD0 && !SANITIZER_NETBSD0
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-14~++20210828111110+16086d47c0d0/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
592static void GetArgsAndEnv(char ***argv, char ***envp) {
593#if SANITIZER_FREEBSD0
594 // On FreeBSD, retrieving the argument and environment arrays is done via the
595 // kern.ps_strings sysctl, which returns a pointer to a structure containing
596 // this information. See also <sys/exec.h>.
597 ps_strings *pss;
598 uptr sz = sizeof(pss);
599 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL__null, 0) == -1) {
600 Printf("sysctl kern.ps_strings failed\n");
601 Die();
602 }
603 *argv = pss->ps_argvstr;
604 *envp = pss->ps_envstr;
605#elif SANITIZER_NETBSD0
606 *argv = __ps_strings->ps_argvstr;
607 *envp = __ps_strings->ps_envstr;
608#else // SANITIZER_FREEBSD
609#if !SANITIZER_GO0
610 if (&__libc_stack_end) {
611 uptr* stack_end = (uptr*)__libc_stack_end;
612 // Normally argc can be obtained from *stack_end, however, on ARM glibc's
613 // _start clobbers it:
614 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75
615 // Do not special-case ARM and infer argc from argv everywhere.
616 int argc = 0;
617 while (stack_end[argc + 1]) argc++;
618 *argv = (char**)(stack_end + 1);
619 *envp = (char**)(stack_end + argc + 2);
620 } else {
621#endif // !SANITIZER_GO
622 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
623 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
624 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
625#if !SANITIZER_GO0
626 }
627#endif // !SANITIZER_GO
628#endif // SANITIZER_FREEBSD
629}
630
631char **GetArgv() {
632 char **argv, **envp;
633 GetArgsAndEnv(&argv, &envp);
634 return argv;
635}
636
637char **GetEnviron() {
638 char **argv, **envp;
639 GetArgsAndEnv(&argv, &envp);
640 return envp;
641}
642
643#if !SANITIZER_SOLARIS0
644void FutexWait(atomic_uint32_t *p, u32 cmp) {
645# if SANITIZER_FREEBSD0
646 _umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0);
647# elif SANITIZER_NETBSD0
648 sched_yield(); /* No userspace futex-like synchronization */
649# else
650 internal_syscall(SYSCALL(futex)202, (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0);
651# endif
652}
653
654void FutexWake(atomic_uint32_t *p, u32 count) {
655# if SANITIZER_FREEBSD0
656 _umtx_op(p, UMTX_OP_WAKE, count, 0, 0);
657# elif SANITIZER_NETBSD0
658 /* No userspace futex-like synchronization */
659# else
660 internal_syscall(SYSCALL(futex)202, (uptr)p, FUTEX_WAKE_PRIVATE, count, 0, 0, 0);
661# endif
662}
663
664# endif // !SANITIZER_SOLARIS
665
666// ----------------- sanitizer_linux.h
667// The actual size of this structure is specified by d_reclen.
668// Note that getdents64 uses a different structure format. We only provide the
669// 32-bit syscall here.
670#if SANITIZER_NETBSD0
671// Not used
672#else
673struct linux_dirent {
674#if SANITIZER_X320 || defined(__aarch64__) || SANITIZER_RISCV640
675 u64 d_ino;
676 u64 d_off;
677#else
678 unsigned long d_ino;
679 unsigned long d_off;
680#endif
681 unsigned short d_reclen;
682#if defined(__aarch64__) || SANITIZER_RISCV640
683 unsigned char d_type;
684#endif
685 char d_name[256];
686};
687#endif
688
689#if !SANITIZER_SOLARIS0 && !SANITIZER_NETBSD0
690// Syscall wrappers.
691uptr internal_ptrace(int request, int pid, void *addr, void *data) {
692 return internal_syscall(SYSCALL(ptrace)101, request, pid, (uptr)addr,
693 (uptr)data);
694}
695
696uptr internal_waitpid(int pid, int *status, int options) {
697 return internal_syscall(SYSCALL(wait4)61, pid, (uptr)status, options,
698 0 /* rusage */);
699}
700
701uptr internal_getpid() {
702 return internal_syscall(SYSCALL(getpid)39);
703}
704
705uptr internal_getppid() {
706 return internal_syscall(SYSCALL(getppid)110);
707}
708
709int internal_dlinfo(void *handle, int request, void *p) {
710#if SANITIZER_FREEBSD0
711 return dlinfo(handle, request, p);
712#else
713 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 713, "(" "(0 && \"unimplemented\")" ") " "!=" " (" "0"
")", v1, v2); } while (false); Die(); } while (0);
714#endif
715}
716
717uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
718#if SANITIZER_FREEBSD0
719 return internal_syscall(SYSCALL(getdirentries)__NR_getdirentries, fd, (uptr)dirp, count, NULL__null);
720#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
721 return internal_syscall(SYSCALL(getdents64)217, fd, (uptr)dirp, count);
722#else
723 return internal_syscall(SYSCALL(getdents)78, fd, (uptr)dirp, count);
724#endif
725}
726
727uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
728 return internal_syscall(SYSCALL(lseek)8, fd, offset, whence);
729}
730
731#if SANITIZER_LINUX1
732uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
733 return internal_syscall(SYSCALL(prctl)157, option, arg2, arg3, arg4, arg5);
734}
735#endif
736
737uptr internal_sigaltstack(const void *ss, void *oss) {
738 return internal_syscall(SYSCALL(sigaltstack)131, (uptr)ss, (uptr)oss);
739}
740
741int internal_fork() {
742#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS0
743 return internal_syscall(SYSCALL(clone)56, SIGCHLD17, 0);
744#else
745 return internal_syscall(SYSCALL(fork)57);
746#endif
747}
748
749#if SANITIZER_FREEBSD0
750int internal_sysctl(const int *name, unsigned int namelen, void *oldp,
751 uptr *oldlenp, const void *newp, uptr newlen) {
752 return internal_syscall(SYSCALL(__sysctl)__NR___sysctl, name, namelen, oldp,
753 (size_t *)oldlenp, newp, (size_t)newlen);
754}
755
756int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp,
757 const void *newp, uptr newlen) {
758 // Note: this function can be called during startup, so we need to avoid
759 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname()
760 // is a real syscall, but for older versions it calls sysctlnametomib()
761 // followed by sysctl(). To avoid calling the intercepted version and
762 // asserting if this happens during startup, call the real sysctlnametomib()
763 // followed by internal_sysctl() if the syscall is not available.
764#ifdef SYS___sysctlbyname
765 return internal_syscall(SYSCALL(__sysctlbyname)__NR___sysctlbyname, sname,
766 internal_strlen(sname), oldp, (size_t *)oldlenp, newp,
767 (size_t)newlen);
768#else
769 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr;
770 if (!real_sysctlnametomib)
771 real_sysctlnametomib =
772 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT((void *) -1l), "sysctlnametomib");
773 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 773, "(" "(real_sysctlnametomib)" ") " "!=" " (" "0" ")", v1
, v2); } while (false);
774
775 int oid[CTL_MAXNAME];
776 size_t len = CTL_MAXNAME;
777 if (real_sysctlnametomib(sname, oid, &len) == -1)
778 return (-1);
779 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen);
780#endif
781}
782#endif
783
784#if SANITIZER_LINUX1
785#define SA_RESTORER0x04000000 0x04000000
786// Doesn't set sa_restorer if the caller did not set it, so use with caution
787//(see below).
788int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
789 __sanitizer_kernel_sigaction_t k_act, k_oldact;
790 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
791 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
792 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
793 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
794 if (u_act) {
795 k_act.handler = u_act->handler;
796 k_act.sigaction = u_act->sigaction;
797 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
798 sizeof(__sanitizer_kernel_sigset_t));
799 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
800 k_act.sa_flags = u_act->sa_flags | SA_RESTORER0x04000000;
801 // FIXME: most often sa_restorer is unset, however the kernel requires it
802 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
803 // If sa_restorer passed to the kernel is NULL, the program may crash upon
804 // signal delivery or fail to unwind the stack in the signal handler.
805 // libc implementation of sigaction() passes its own restorer to
806 // rt_sigaction, so we need to do the same (we'll need to reimplement the
807 // restorers; for x86_64 the restorer address can be obtained from
808 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
809#if !SANITIZER_ANDROID0 || !SANITIZER_MIPS320
810 k_act.sa_restorer = u_act->sa_restorer;
811#endif
812 }
813
814 uptr result = internal_syscall(SYSCALL(rt_sigaction)13, (uptr)signum,
815 (uptr)(u_act ? &k_act : nullptr),
816 (uptr)(u_oldact ? &k_oldact : nullptr),
817 (uptr)sizeof(__sanitizer_kernel_sigset_t));
818
819 if ((result == 0) && u_oldact) {
820 u_oldact->handler = k_oldact.handler;
821 u_oldact->sigaction = k_oldact.sigaction;
822 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
823 sizeof(__sanitizer_kernel_sigset_t));
824 u_oldact->sa_flags = k_oldact.sa_flags;
825#if !SANITIZER_ANDROID0 || !SANITIZER_MIPS320
826 u_oldact->sa_restorer = k_oldact.sa_restorer;
827#endif
828 }
829 return result;
830}
831#endif // SANITIZER_LINUX
832
833uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
834 __sanitizer_sigset_t *oldset) {
835#if SANITIZER_FREEBSD0
836 return internal_syscall(SYSCALL(sigprocmask)__NR_sigprocmask, how, set, oldset);
837#else
838 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
839 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
840 return internal_syscall(SYSCALL(rt_sigprocmask)14, (uptr)how, (uptr)k_set,
841 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t));
842#endif
843}
844
845void internal_sigfillset(__sanitizer_sigset_t *set) {
846 internal_memset(set, 0xff, sizeof(*set));
847}
848
849void internal_sigemptyset(__sanitizer_sigset_t *set) {
850 internal_memset(set, 0, sizeof(*set));
851}
852
853#if SANITIZER_LINUX1
854void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
855 signum -= 1;
856 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 856, "(" "(signum)" ") " ">=" " (" "(0)" ")", v1, v2); }
while (false);
857 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 857, "(" "(signum)" ") " "<" " (" "(sizeof(*set) * 8)" ")"
, v1, v2); } while (false);
858 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
859 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
860 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
861 k_set->sig[idx] &= ~((uptr)1 << bit);
862}
863
864bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
865 signum -= 1;
866 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 866, "(" "(signum)" ") " ">=" " (" "(0)" ")", v1, v2); }
while (false);
867 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 867, "(" "(signum)" ") " "<" " (" "(sizeof(*set) * 8)" ")"
, v1, v2); } while (false);
868 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
869 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
870 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
871 return k_set->sig[idx] & ((uptr)1 << bit);
872}
873#elif SANITIZER_FREEBSD0
874void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
875 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
876 sigdelset(rset, signum);
877}
878
879bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
880 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
881 return sigismember(rset, signum);
882}
883#endif
884#endif // !SANITIZER_SOLARIS
885
886#if !SANITIZER_NETBSD0
887// ThreadLister implementation.
888ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) {
889 char task_directory_path[80];
890 internal_snprintf(task_directory_path, sizeof(task_directory_path),
891 "/proc/%d/task/", pid);
892 descriptor_ = internal_open(task_directory_path, O_RDONLY00 | O_DIRECTORY0200000);
893 if (internal_iserror(descriptor_)) {
894 Report("Can't open /proc/%d/task for reading.\n", pid);
895 }
896}
897
898ThreadLister::Result ThreadLister::ListThreads(
899 InternalMmapVector<tid_t> *threads) {
900 if (internal_iserror(descriptor_))
901 return Error;
902 internal_lseek(descriptor_, 0, SEEK_SET0);
903 threads->clear();
904
905 Result result = Ok;
906 for (bool first_read = true;; first_read = false) {
907 // Resize to max capacity if it was downsized by IsAlive.
908 buffer_.resize(buffer_.capacity());
909 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 909, "(" "(buffer_.size())" ") " ">=" " (" "(4096)" ")",
v1, v2); } while (false);
910 uptr read = internal_getdents(
911 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size());
912 if (!read)
913 return result;
914 if (internal_iserror(read)) {
915 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
916 return Error;
917 }
918
919 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) {
920 struct linux_dirent *entry = (struct linux_dirent *)begin;
921 begin += entry->d_reclen;
922 if (entry->d_ino == 1) {
923 // Inode 1 is for bad blocks and also can be a reason for early return.
924 // Should be emitted if kernel tried to output terminating thread.
925 // See proc_task_readdir implementation in Linux.
926 result = Incomplete;
927 }
928 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9')
929 threads->push_back(internal_atoll(entry->d_name));
930 }
931
932 // Now we are going to detect short-read or early EOF. In such cases Linux
933 // can return inconsistent list with missing alive threads.
934 // Code will just remember that the list can be incomplete but it will
935 // continue reads to return as much as possible.
936 if (!first_read) {
937 // The first one was a short-read by definition.
938 result = Incomplete;
939 } else if (read > buffer_.size() - 1024) {
940 // Read was close to the buffer size. So double the size and assume the
941 // worst.
942 buffer_.resize(buffer_.size() * 2);
943 result = Incomplete;
944 } else if (!threads->empty() && !IsAlive(threads->back())) {
945 // Maybe Linux early returned from read on terminated thread (!pid_alive)
946 // and failed to restore read position.
947 // See next_tid and proc_task_instantiate in Linux.
948 result = Incomplete;
949 }
950 }
951}
952
953bool ThreadLister::IsAlive(int tid) {
954 // /proc/%d/task/%d/status uses same call to detect alive threads as
955 // proc_task_readdir. See task_state implementation in Linux.
956 char path[80];
957 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid);
958 if (!ReadFileToVector(path, &buffer_) || buffer_.empty())
959 return false;
960 buffer_.push_back(0);
961 static const char kPrefix[] = "\nPPid:";
962 const char *field = internal_strstr(buffer_.data(), kPrefix);
963 if (!field)
964 return false;
965 field += internal_strlen(kPrefix);
966 return (int)internal_atoll(field) != 0;
967}
968
969ThreadLister::~ThreadLister() {
970 if (!internal_iserror(descriptor_))
971 internal_close(descriptor_);
972}
973#endif
974
975#if SANITIZER_WORDSIZE64 == 32
976// Take care of unusable kernel area in top gigabyte.
977static uptr GetKernelAreaSize() {
978#if SANITIZER_LINUX1 && !SANITIZER_X320
979 const uptr gbyte = 1UL << 30;
980
981 // Firstly check if there are writable segments
982 // mapped to top gigabyte (e.g. stack).
983 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
984 if (proc_maps.Error())
985 return 0;
986 MemoryMappedSegment segment;
987 while (proc_maps.Next(&segment)) {
988 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0;
989 }
990
991#if !SANITIZER_ANDROID0
992 // Even if nothing is mapped, top Gb may still be accessible
993 // if we are running on 64-bit kernel.
994 // Uname may report misleading results if personality type
995 // is modified (e.g. under schroot) so check this as well.
996 struct utsname uname_info;
997 int pers = personality(0xffffffffUL);
998 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 &&
999 internal_strstr(uname_info.machine, "64"))
1000 return 0;
1001#endif // SANITIZER_ANDROID
1002
1003 // Top gigabyte is reserved for kernel.
1004 return gbyte;
1005#else
1006 return 0;
1007#endif // SANITIZER_LINUX && !SANITIZER_X32
1008}
1009#endif // SANITIZER_WORDSIZE == 32
1010
1011uptr GetMaxVirtualAddress() {
1012#if SANITIZER_NETBSD0 && defined(__x86_64__1)
1013 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE)
1014#elif SANITIZER_WORDSIZE64 == 64
1015# if defined(__powerpc64__) || defined(__aarch64__)
1016 // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
1017 // We somehow need to figure out which one we are using now and choose
1018 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
1019 // Note that with 'ulimit -s unlimited' the stack is moved away from the top
1020 // of the address space, so simply checking the stack address is not enough.
1021 // This should (does) work for both PowerPC64 Endian modes.
1022 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
1023 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()(__sanitizer::uptr) __builtin_frame_address(0)) + 1)) - 1;
1024#elif SANITIZER_RISCV640
1025 return (1ULL << 38) - 1;
1026# elif defined(__mips64)
1027 return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
1028# elif defined(__s390x__)
1029 return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
1030#elif defined(__sparc__)
1031 return ~(uptr)0;
1032# else
1033 return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
1034# endif
1035#else // SANITIZER_WORDSIZE == 32
1036# if defined(__s390__)
1037 return (1ULL << 31) - 1; // 0x7fffffff;
1038# else
1039 return (1ULL << 32) - 1; // 0xffffffff;
1040# endif
1041#endif // SANITIZER_WORDSIZE
1042}
1043
1044uptr GetMaxUserVirtualAddress() {
1045 uptr addr = GetMaxVirtualAddress();
1046#if SANITIZER_WORDSIZE64 == 32 && !defined(__s390__)
1047 if (!common_flags()->full_address_space)
1048 addr -= GetKernelAreaSize();
1049 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1049, "(" "(reinterpret_cast<uptr>(&addr))" ") " "<"
" (" "(addr)" ")", v1, v2); } while (false);
1050#endif
1051 return addr;
1052}
1053
1054#if !SANITIZER_ANDROID0
1055uptr GetPageSize() {
1056#if SANITIZER_LINUX1 && (defined(__x86_64__1) || defined(__i386__)) && \
1057 defined(EXEC_PAGESIZE4096)
1058 return EXEC_PAGESIZE4096;
1059#elif SANITIZER_FREEBSD0 || SANITIZER_NETBSD0
1060// Use sysctl as sysconf can trigger interceptors internally.
1061 int pz = 0;
1062 uptr pzl = sizeof(pz);
1063 int mib[2] = {CTL_HW, HW_PAGESIZE};
1064 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0);
1065 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1065, "(" "(rv)" ") " "==" " (" "(0)" ")", v1, v2); } while
(false);
1066 return (uptr)pz;
1067#elif SANITIZER_USE_GETAUXVAL1
1068 return getauxval(AT_PAGESZ6);
1069#else
1070 return sysconf(_SC_PAGESIZE_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
1071#endif
1072}
1073#endif // !SANITIZER_ANDROID
1074
1075uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
1076#if SANITIZER_SOLARIS0
1077 const char *default_module_name = getexecname();
1078 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1078, "(" "(default_module_name)" ") " "!=" " (" "(__null)"
")", v1, v2); } while (false);
1079 return internal_snprintf(buf, buf_len, "%s", default_module_name);
1080#else
1081#if SANITIZER_FREEBSD0 || SANITIZER_NETBSD0
1082#if SANITIZER_FREEBSD0
1083 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
1084#else
1085 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
1086#endif
1087 const char *default_module_name = "kern.proc.pathname";
1088 uptr Size = buf_len;
1089 bool IsErr =
1090 (internal_sysctl(Mib, ARRAY_SIZE(Mib)(sizeof(Mib)/sizeof((Mib)[0])), buf, &Size, NULL__null, 0) != 0);
1091 int readlink_error = IsErr ? errno(*__errno_location ()) : 0;
1092 uptr module_name_len = Size;
1093#else
1094 const char *default_module_name = "/proc/self/exe";
1095 uptr module_name_len = internal_readlink(
1096 default_module_name, buf, buf_len);
1097 int readlink_error;
1098 bool IsErr = internal_iserror(module_name_len, &readlink_error);
1099#endif // SANITIZER_SOLARIS
1100 if (IsErr) {
1101 // We can't read binary name for some reason, assume it's unknown.
1102 Report("WARNING: reading executable name failed with errno %d, "
1103 "some stack frames may not be symbolized\n", readlink_error);
1104 module_name_len = internal_snprintf(buf, buf_len, "%s",
1105 default_module_name);
1106 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1106, "(" "(module_name_len)" ") " "<" " (" "(buf_len)" ")"
, v1, v2); } while (false);
1107 }
1108 return module_name_len;
1109#endif
1110}
1111
1112uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
1113#if SANITIZER_LINUX1
1114 char *tmpbuf;
1115 uptr tmpsize;
1116 uptr tmplen;
1117 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
1118 1024 * 1024)) {
1119 internal_strncpy(buf, tmpbuf, buf_len);
1120 UnmapOrDie(tmpbuf, tmpsize);
1121 return internal_strlen(buf);
1122 }
1123#endif
1124 return ReadBinaryName(buf, buf_len);
1125}
1126
1127// Match full names of the form /path/to/base_name{-,.}*
1128bool LibraryNameIs(const char *full_name, const char *base_name) {
1129 const char *name = full_name;
1130 // Strip path.
1131 while (*name != '\0') name++;
1132 while (name > full_name && *name != '/') name--;
1133 if (*name == '/') name++;
1134 uptr base_name_length = internal_strlen(base_name);
1135 if (internal_strncmp(name, base_name, base_name_length)) return false;
1136 return (name[base_name_length] == '-' || name[base_name_length] == '.');
1137}
1138
1139#if !SANITIZER_ANDROID0
1140// Call cb for each region mapped by map.
1141void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
1142 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1142, "(" "(map)" ") " "!=" " (" "(nullptr)" ")", v1, v2); }
while (false);
1143#if !SANITIZER_FREEBSD0
1144 typedef ElfW(Phdr)Elf64_Phdr Elf_Phdr;
1145 typedef ElfW(Ehdr)Elf64_Ehdr Elf_Ehdr;
1146#endif // !SANITIZER_FREEBSD
1147 char *base = (char *)map->l_addr;
1148 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
1149 char *phdrs = base + ehdr->e_phoff;
1150 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
1151
1152 // Find the segment with the minimum base so we can "relocate" the p_vaddr
1153 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
1154 // objects have a non-zero base.
1155 uptr preferred_base = (uptr)-1;
1156 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
1157 Elf_Phdr *phdr = (Elf_Phdr *)iter;
1158 if (phdr->p_type == PT_LOAD1 && preferred_base > (uptr)phdr->p_vaddr)
1159 preferred_base = (uptr)phdr->p_vaddr;
1160 }
1161
1162 // Compute the delta from the real base to get a relocation delta.
1163 sptr delta = (uptr)base - preferred_base;
1164 // Now we can figure out what the loader really mapped.
1165 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
1166 Elf_Phdr *phdr = (Elf_Phdr *)iter;
1167 if (phdr->p_type == PT_LOAD1) {
1168 uptr seg_start = phdr->p_vaddr + delta;
1169 uptr seg_end = seg_start + phdr->p_memsz;
1170 // None of these values are aligned. We consider the ragged edges of the
1171 // load command as defined, since they are mapped from the file.
1172 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
1173 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
1174 cb((void *)seg_start, seg_end - seg_start);
1175 }
1176 }
1177}
1178#endif
1179
1180#if SANITIZER_LINUX1
1181#if defined(__x86_64__1)
1182// We cannot use glibc's clone wrapper, because it messes with the child
1183// task's TLS. It writes the PID and TID of the child task to its thread
1184// descriptor, but in our case the child task shares the thread descriptor with
1185// the parent (because we don't know how to allocate a new thread
1186// descriptor to keep glibc happy). So the stock version of clone(), when
1187// used with CLONE_VM, would end up corrupting the parent's thread descriptor.
1188uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1189 int *parent_tidptr, void *newtls, int *child_tidptr) {
1190 long long res;
1191 if (!fn || !child_stack)
1192 return -EINVAL22;
1193 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1193, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1194 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1195 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1196 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1197 register void *r8 __asm__("r8") = newtls;
1198 register int *r10 __asm__("r10") = child_tidptr;
1199 __asm__ __volatile__(
1200 /* %rax = syscall(%rax = SYSCALL(clone),
1201 * %rdi = flags,
1202 * %rsi = child_stack,
1203 * %rdx = parent_tidptr,
1204 * %r8 = new_tls,
1205 * %r10 = child_tidptr)
1206 */
1207 "syscall\n"
1208
1209 /* if (%rax != 0)
1210 * return;
1211 */
1212 "testq %%rax,%%rax\n"
1213 "jnz 1f\n"
1214
1215 /* In the child. Terminate unwind chain. */
1216 // XXX: We should also terminate the CFI unwind chain
1217 // here. Unfortunately clang 3.2 doesn't support the
1218 // necessary CFI directives, so we skip that part.
1219 "xorq %%rbp,%%rbp\n"
1220
1221 /* Call "fn(arg)". */
1222 "popq %%rax\n"
1223 "popq %%rdi\n"
1224 "call *%%rax\n"
1225
1226 /* Call _exit(%rax). */
1227 "movq %%rax,%%rdi\n"
1228 "movq %2,%%rax\n"
1229 "syscall\n"
1230
1231 /* Return to parent. */
1232 "1:\n"
1233 : "=a" (res)
1234 : "a"(SYSCALL(clone)56), "i"(SYSCALL(exit)60),
1235 "S"(child_stack),
1236 "D"(flags),
1237 "d"(parent_tidptr),
1238 "r"(r8),
1239 "r"(r10)
1240 : "memory", "r11", "rcx");
1241 return res;
1242}
1243#elif defined(__mips__)
1244uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1245 int *parent_tidptr, void *newtls, int *child_tidptr) {
1246 long long res;
1247 if (!fn || !child_stack)
1248 return -EINVAL22;
1249 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1249, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1250 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1251 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1252 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1253 register void *a3 __asm__("$7") = newtls;
1254 register int *a4 __asm__("$8") = child_tidptr;
1255 // We don't have proper CFI directives here because it requires alot of code
1256 // for very marginal benefits.
1257 __asm__ __volatile__(
1258 /* $v0 = syscall($v0 = __NR_clone,
1259 * $a0 = flags,
1260 * $a1 = child_stack,
1261 * $a2 = parent_tidptr,
1262 * $a3 = new_tls,
1263 * $a4 = child_tidptr)
1264 */
1265 ".cprestore 16;\n"
1266 "move $4,%1;\n"
1267 "move $5,%2;\n"
1268 "move $6,%3;\n"
1269 "move $7,%4;\n"
1270 /* Store the fifth argument on stack
1271 * if we are using 32-bit abi.
1272 */
1273#if SANITIZER_WORDSIZE64 == 32
1274 "lw %5,16($29);\n"
1275#else
1276 "move $8,%5;\n"
1277#endif
1278 "li $2,%6;\n"
1279 "syscall;\n"
1280
1281 /* if ($v0 != 0)
1282 * return;
1283 */
1284 "bnez $2,1f;\n"
1285
1286 /* Call "fn(arg)". */
1287#if SANITIZER_WORDSIZE64 == 32
1288#ifdef __BIG_ENDIAN__
1289 "lw $25,4($29);\n"
1290 "lw $4,12($29);\n"
1291#else
1292 "lw $25,0($29);\n"
1293 "lw $4,8($29);\n"
1294#endif
1295#else
1296 "ld $25,0($29);\n"
1297 "ld $4,8($29);\n"
1298#endif
1299 "jal $25;\n"
1300
1301 /* Call _exit($v0). */
1302 "move $4,$2;\n"
1303 "li $2,%7;\n"
1304 "syscall;\n"
1305
1306 /* Return to parent. */
1307 "1:\n"
1308 : "=r" (res)
1309 : "r"(flags),
1310 "r"(child_stack),
1311 "r"(parent_tidptr),
1312 "r"(a3),
1313 "r"(a4),
1314 "i"(__NR_clone56),
1315 "i"(__NR_exit60)
1316 : "memory", "$29" );
1317 return res;
1318}
1319#elif SANITIZER_RISCV640
1320uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1321 int *parent_tidptr, void *newtls, int *child_tidptr) {
1322 if (!fn || !child_stack)
1323 return -EINVAL22;
1324
1325 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1325, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1326
1327 register int res __asm__("a0");
1328 register int __flags __asm__("a0") = flags;
1329 register void *__stack __asm__("a1") = child_stack;
1330 register int *__ptid __asm__("a2") = parent_tidptr;
1331 register void *__tls __asm__("a3") = newtls;
1332 register int *__ctid __asm__("a4") = child_tidptr;
1333 register int (*__fn)(void *) __asm__("a5") = fn;
1334 register void *__arg __asm__("a6") = arg;
1335 register int nr_clone __asm__("a7") = __NR_clone56;
1336
1337 __asm__ __volatile__(
1338 "ecall\n"
1339
1340 /* if (a0 != 0)
1341 * return a0;
1342 */
1343 "bnez a0, 1f\n"
1344
1345 // In the child, now. Call "fn(arg)".
1346 "mv a0, a6\n"
1347 "jalr a5\n"
1348
1349 // Call _exit(a0).
1350 "addi a7, zero, %9\n"
1351 "ecall\n"
1352 "1:\n"
1353
1354 : "=r"(res)
1355 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid),
1356 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit60)
1357 : "memory");
1358 return res;
1359}
1360#elif defined(__aarch64__)
1361uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1362 int *parent_tidptr, void *newtls, int *child_tidptr) {
1363 long long res;
1364 if (!fn || !child_stack)
1365 return -EINVAL22;
1366 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1366, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1367 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1368 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1369 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1370
1371 register int (*__fn)(void *) __asm__("x0") = fn;
1372 register void *__stack __asm__("x1") = child_stack;
1373 register int __flags __asm__("x2") = flags;
1374 register void *__arg __asm__("x3") = arg;
1375 register int *__ptid __asm__("x4") = parent_tidptr;
1376 register void *__tls __asm__("x5") = newtls;
1377 register int *__ctid __asm__("x6") = child_tidptr;
1378
1379 __asm__ __volatile__(
1380 "mov x0,x2\n" /* flags */
1381 "mov x2,x4\n" /* ptid */
1382 "mov x3,x5\n" /* tls */
1383 "mov x4,x6\n" /* ctid */
1384 "mov x8,%9\n" /* clone */
1385
1386 "svc 0x0\n"
1387
1388 /* if (%r0 != 0)
1389 * return %r0;
1390 */
1391 "cmp x0, #0\n"
1392 "bne 1f\n"
1393
1394 /* In the child, now. Call "fn(arg)". */
1395 "ldp x1, x0, [sp], #16\n"
1396 "blr x1\n"
1397
1398 /* Call _exit(%r0). */
1399 "mov x8, %10\n"
1400 "svc 0x0\n"
1401 "1:\n"
1402
1403 : "=r" (res)
1404 : "i"(-EINVAL22),
1405 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1406 "r"(__ptid), "r"(__tls), "r"(__ctid),
1407 "i"(__NR_clone56), "i"(__NR_exit60)
1408 : "x30", "memory");
1409 return res;
1410}
1411#elif defined(__powerpc64__)
1412uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1413 int *parent_tidptr, void *newtls, int *child_tidptr) {
1414 long long res;
1415// Stack frame structure.
1416#if SANITIZER_PPC64V10
1417// Back chain == 0 (SP + 112)
1418// Frame (112 bytes):
1419// Parameter save area (SP + 48), 8 doublewords
1420// TOC save area (SP + 40)
1421// Link editor doubleword (SP + 32)
1422// Compiler doubleword (SP + 24)
1423// LR save area (SP + 16)
1424// CR save area (SP + 8)
1425// Back chain (SP + 0)
1426# define FRAME_SIZE 112
1427# define FRAME_TOC_SAVE_OFFSET 40
1428#elif SANITIZER_PPC64V20
1429// Back chain == 0 (SP + 32)
1430// Frame (32 bytes):
1431// TOC save area (SP + 24)
1432// LR save area (SP + 16)
1433// CR save area (SP + 8)
1434// Back chain (SP + 0)
1435# define FRAME_SIZE 32
1436# define FRAME_TOC_SAVE_OFFSET 24
1437#else
1438# error "Unsupported PPC64 ABI"
1439#endif
1440 if (!fn || !child_stack)
1441 return -EINVAL22;
1442 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1442, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1443
1444 register int (*__fn)(void *) __asm__("r3") = fn;
1445 register void *__cstack __asm__("r4") = child_stack;
1446 register int __flags __asm__("r5") = flags;
1447 register void *__arg __asm__("r6") = arg;
1448 register int *__ptidptr __asm__("r7") = parent_tidptr;
1449 register void *__newtls __asm__("r8") = newtls;
1450 register int *__ctidptr __asm__("r9") = child_tidptr;
1451
1452 __asm__ __volatile__(
1453 /* fn and arg are saved across the syscall */
1454 "mr 28, %5\n\t"
1455 "mr 27, %8\n\t"
1456
1457 /* syscall
1458 r0 == __NR_clone
1459 r3 == flags
1460 r4 == child_stack
1461 r5 == parent_tidptr
1462 r6 == newtls
1463 r7 == child_tidptr */
1464 "mr 3, %7\n\t"
1465 "mr 5, %9\n\t"
1466 "mr 6, %10\n\t"
1467 "mr 7, %11\n\t"
1468 "li 0, %3\n\t"
1469 "sc\n\t"
1470
1471 /* Test if syscall was successful */
1472 "cmpdi cr1, 3, 0\n\t"
1473 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
1474 "bne- cr1, 1f\n\t"
1475
1476 /* Set up stack frame */
1477 "li 29, 0\n\t"
1478 "stdu 29, -8(1)\n\t"
1479 "stdu 1, -%12(1)\n\t"
1480 /* Do the function call */
1481 "std 2, %13(1)\n\t"
1482#if SANITIZER_PPC64V10
1483 "ld 0, 0(28)\n\t"
1484 "ld 2, 8(28)\n\t"
1485 "mtctr 0\n\t"
1486#elif SANITIZER_PPC64V20
1487 "mr 12, 28\n\t"
1488 "mtctr 12\n\t"
1489#else
1490# error "Unsupported PPC64 ABI"
1491#endif
1492 "mr 3, 27\n\t"
1493 "bctrl\n\t"
1494 "ld 2, %13(1)\n\t"
1495
1496 /* Call _exit(r3) */
1497 "li 0, %4\n\t"
1498 "sc\n\t"
1499
1500 /* Return to parent */
1501 "1:\n\t"
1502 "mr %0, 3\n\t"
1503 : "=r" (res)
1504 : "0" (-1),
1505 "i" (EINVAL22),
1506 "i" (__NR_clone56),
1507 "i" (__NR_exit60),
1508 "r" (__fn),
1509 "r" (__cstack),
1510 "r" (__flags),
1511 "r" (__arg),
1512 "r" (__ptidptr),
1513 "r" (__newtls),
1514 "r" (__ctidptr),
1515 "i" (FRAME_SIZE),
1516 "i" (FRAME_TOC_SAVE_OFFSET)
1517 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
1518 return res;
1519}
1520#elif defined(__i386__)
1521uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1522 int *parent_tidptr, void *newtls, int *child_tidptr) {
1523 int res;
1524 if (!fn || !child_stack)
1525 return -EINVAL22;
1526 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 1526, "(" "(0)" ") " "==" " (" "((uptr)child_stack % 16)" ")"
, v1, v2); } while (false);
1527 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
1528 ((unsigned int *)child_stack)[0] = (uptr)flags;
1529 ((unsigned int *)child_stack)[1] = (uptr)0;
1530 ((unsigned int *)child_stack)[2] = (uptr)fn;
1531 ((unsigned int *)child_stack)[3] = (uptr)arg;
1532 __asm__ __volatile__(
1533 /* %eax = syscall(%eax = SYSCALL(clone),
1534 * %ebx = flags,
1535 * %ecx = child_stack,
1536 * %edx = parent_tidptr,
1537 * %esi = new_tls,
1538 * %edi = child_tidptr)
1539 */
1540
1541 /* Obtain flags */
1542 "movl (%%ecx), %%ebx\n"
1543 /* Do the system call */
1544 "pushl %%ebx\n"
1545 "pushl %%esi\n"
1546 "pushl %%edi\n"
1547 /* Remember the flag value. */
1548 "movl %%ebx, (%%ecx)\n"
1549 "int $0x80\n"
1550 "popl %%edi\n"
1551 "popl %%esi\n"
1552 "popl %%ebx\n"
1553
1554 /* if (%eax != 0)
1555 * return;
1556 */
1557
1558 "test %%eax,%%eax\n"
1559 "jnz 1f\n"
1560
1561 /* terminate the stack frame */
1562 "xorl %%ebp,%%ebp\n"
1563 /* Call FN. */
1564 "call *%%ebx\n"
1565#ifdef PIC
1566 "call here\n"
1567 "here:\n"
1568 "popl %%ebx\n"
1569 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
1570#endif
1571 /* Call exit */
1572 "movl %%eax, %%ebx\n"
1573 "movl %2, %%eax\n"
1574 "int $0x80\n"
1575 "1:\n"
1576 : "=a" (res)
1577 : "a"(SYSCALL(clone)56), "i"(SYSCALL(exit)60),
1578 "c"(child_stack),
1579 "d"(parent_tidptr),
1580 "S"(newtls),
1581 "D"(child_tidptr)
1582 : "memory");
1583 return res;
1584}
1585#elif defined(__arm__)
1586uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1587 int *parent_tidptr, void *newtls, int *child_tidptr) {
1588 unsigned int res;
1589 if (!fn || !child_stack)
1590 return -EINVAL22;
1591 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
1592 ((unsigned int *)child_stack)[0] = (uptr)fn;
1593 ((unsigned int *)child_stack)[1] = (uptr)arg;
1594 register int r0 __asm__("r0") = flags;
1595 register void *r1 __asm__("r1") = child_stack;
1596 register int *r2 __asm__("r2") = parent_tidptr;
1597 register void *r3 __asm__("r3") = newtls;
1598 register int *r4 __asm__("r4") = child_tidptr;
1599 register int r7 __asm__("r7") = __NR_clone56;
1600
1601#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
1602# define ARCH_HAS_BX
1603#endif
1604#if __ARM_ARCH > 4
1605# define ARCH_HAS_BLX
1606#endif
1607
1608#ifdef ARCH_HAS_BX
1609# ifdef ARCH_HAS_BLX
1610# define BLX(R) "blx " #R "\n"
1611# else
1612# define BLX(R) "mov lr, pc; bx " #R "\n"
1613# endif
1614#else
1615# define BLX(R) "mov lr, pc; mov pc," #R "\n"
1616#endif
1617
1618 __asm__ __volatile__(
1619 /* %r0 = syscall(%r7 = SYSCALL(clone),
1620 * %r0 = flags,
1621 * %r1 = child_stack,
1622 * %r2 = parent_tidptr,
1623 * %r3 = new_tls,
1624 * %r4 = child_tidptr)
1625 */
1626
1627 /* Do the system call */
1628 "swi 0x0\n"
1629
1630 /* if (%r0 != 0)
1631 * return %r0;
1632 */
1633 "cmp r0, #0\n"
1634 "bne 1f\n"
1635
1636 /* In the child, now. Call "fn(arg)". */
1637 "ldr r0, [sp, #4]\n"
1638 "ldr ip, [sp], #8\n"
1639 BLX(ip)
1640 /* Call _exit(%r0). */
1641 "mov r7, %7\n"
1642 "swi 0x0\n"
1643 "1:\n"
1644 "mov %0, r0\n"
1645 : "=r"(res)
1646 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
1647 "i"(__NR_exit60)
1648 : "memory");
1649 return res;
1650}
1651#endif
1652#endif // SANITIZER_LINUX
1653
1654#if SANITIZER_LINUX1
1655int internal_uname(struct utsname *buf) {
1656 return internal_syscall(SYSCALL(uname)63, buf);
1657}
1658#endif
1659
1660#if SANITIZER_ANDROID0
1661#if __ANDROID_API__ < 21
1662extern "C" __attribute__((weak)) int dl_iterate_phdr(
1663 int (*)(struct dl_phdr_info *, size_t, void *), void *);
1664#endif
1665
1666static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
1667 void *data) {
1668 // Any name starting with "lib" indicates a bug in L where library base names
1669 // are returned instead of paths.
1670 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
1671 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
1672 *(bool *)data = true;
1673 return 1;
1674 }
1675 return 0;
1676}
1677
1678static atomic_uint32_t android_api_level;
1679
1680static AndroidApiLevel AndroidDetectApiLevelStatic() {
1681#if __ANDROID_API__ <= 19
1682 return ANDROID_KITKAT;
1683#elif __ANDROID_API__ <= 22
1684 return ANDROID_LOLLIPOP_MR1;
1685#else
1686 return ANDROID_POST_LOLLIPOP;
1687#endif
1688}
1689
1690static AndroidApiLevel AndroidDetectApiLevel() {
1691 if (!&dl_iterate_phdr)
1692 return ANDROID_KITKAT; // K or lower
1693 bool base_name_seen = false;
1694 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
1695 if (base_name_seen)
1696 return ANDROID_LOLLIPOP_MR1; // L MR1
1697 return ANDROID_POST_LOLLIPOP; // post-L
1698 // Plain L (API level 21) is completely broken wrt ASan and not very
1699 // interesting to detect.
1700}
1701
1702extern "C" __attribute__((weak)) void* _DYNAMIC;
1703
1704AndroidApiLevel AndroidGetApiLevel() {
1705 AndroidApiLevel level =
1706 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
1707 if (level) return level;
1708 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic()
1709 : AndroidDetectApiLevel();
1710 atomic_store(&android_api_level, level, memory_order_relaxed);
1711 return level;
1712}
1713
1714#endif
1715
1716static HandleSignalMode GetHandleSignalModeImpl(int signum) {
1717 switch (signum) {
1718 case SIGABRT6:
1719 return common_flags()->handle_abort;
1720 case SIGILL4:
1721 return common_flags()->handle_sigill;
1722 case SIGTRAP5:
1723 return common_flags()->handle_sigtrap;
1724 case SIGFPE8:
1725 return common_flags()->handle_sigfpe;
1726 case SIGSEGV11:
1727 return common_flags()->handle_segv;
1728 case SIGBUS7:
1729 return common_flags()->handle_sigbus;
1730 }
1731 return kHandleSignalNo;
1732}
1733
1734HandleSignalMode GetHandleSignalMode(int signum) {
1735 HandleSignalMode result = GetHandleSignalModeImpl(signum);
1736 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
1737 return kHandleSignalExclusive;
1738 return result;
1739}
1740
1741#if !SANITIZER_GO0
1742void *internal_start_thread(void *(*func)(void *arg), void *arg) {
1743 // Start the thread with signals blocked, otherwise it can steal user signals.
1744 __sanitizer_sigset_t set, old;
1745 internal_sigfillset(&set);
1746#if SANITIZER_LINUX1 && !SANITIZER_ANDROID0
1747 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
1748 // on any thread, setuid call hangs (see test/tsan/setuid.c).
1749 internal_sigdelset(&set, 33);
1750#endif
1751 internal_sigprocmask(SIG_SETMASK2, &set, &old);
1752 void *th;
1753 real_pthread_create(&th, nullptr, func, arg);
1754 internal_sigprocmask(SIG_SETMASK2, &old, nullptr);
1755 return th;
1756}
1757
1758void internal_join_thread(void *th) {
1759 real_pthread_join(th, nullptr);
1760}
1761#else
1762void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; }
1763
1764void internal_join_thread(void *th) {}
1765#endif
1766
1767#if defined(__aarch64__)
1768// Android headers in the older NDK releases miss this definition.
1769struct __sanitizer_esr_context {
1770 struct _aarch64_ctx head;
1771 uint64_t esr;
1772};
1773
1774static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
1775 static const u32 kEsrMagic = 0x45535201;
1776 u8 *aux = ucontext->uc_mcontext.__reserved;
1777 while (true) {
1778 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
1779 if (ctx->size == 0) break;
1780 if (ctx->magic == kEsrMagic) {
1781 *esr = ((__sanitizer_esr_context *)ctx)->esr;
1782 return true;
1783 }
1784 aux += ctx->size;
1785 }
1786 return false;
1787}
1788#endif
1789
1790using Context = ucontext_t;
1791
1792SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
1793 Context *ucontext = (Context *)context;
1794#if defined(__x86_64__1) || defined(__i386__)
1795 static const uptr PF_WRITE = 1U << 1;
1796#if SANITIZER_FREEBSD0
1797 uptr err = ucontext->uc_mcontext.mc_err;
1798#elif SANITIZER_NETBSD0
1799 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR];
1800#elif SANITIZER_SOLARIS0 && defined(__i386__)
1801 const int Err = 13;
1802 uptr err = ucontext->uc_mcontext.gregs[Err];
1803#else
1804 uptr err = ucontext->uc_mcontext.gregs[REG_ERRREG_ERR];
1805#endif // SANITIZER_FREEBSD
1806 return err & PF_WRITE ? WRITE : READ;
1807#elif defined(__mips__)
1808 uint32_t *exception_source;
1809 uint32_t faulty_instruction;
1810 uint32_t op_code;
1811
1812 exception_source = (uint32_t *)ucontext->uc_mcontext.pc;
1813 faulty_instruction = (uint32_t)(*exception_source);
1814
1815 op_code = (faulty_instruction >> 26) & 0x3f;
1816
1817 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions.
1818 switch (op_code) {
1819 case 0x28: // sb
1820 case 0x29: // sh
1821 case 0x2b: // sw
1822 case 0x3f: // sd
1823#if __mips_isa_rev < 6
1824 case 0x2c: // sdl
1825 case 0x2d: // sdr
1826 case 0x2a: // swl
1827 case 0x2e: // swr
1828#endif
1829 return SignalContext::WRITE;
1830
1831 case 0x20: // lb
1832 case 0x24: // lbu
1833 case 0x21: // lh
1834 case 0x25: // lhu
1835 case 0x23: // lw
1836 case 0x27: // lwu
1837 case 0x37: // ld
1838#if __mips_isa_rev < 6
1839 case 0x1a: // ldl
1840 case 0x1b: // ldr
1841 case 0x22: // lwl
1842 case 0x26: // lwr
1843#endif
1844 return SignalContext::READ;
1845#if __mips_isa_rev == 6
1846 case 0x3b: // pcrel
1847 op_code = (faulty_instruction >> 19) & 0x3;
1848 switch (op_code) {
1849 case 0x1: // lwpc
1850 case 0x2: // lwupc
1851 return SignalContext::READ;
1852 }
1853#endif
1854 }
1855 return SignalContext::UNKNOWN;
1856#elif defined(__arm__)
1857 static const uptr FSR_WRITE = 1U << 11;
1858 uptr fsr = ucontext->uc_mcontext.error_code;
1859 return fsr & FSR_WRITE ? WRITE : READ;
1860#elif defined(__aarch64__)
1861 static const u64 ESR_ELx_WNR = 1U << 6;
1862 u64 esr;
1863 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
1864 return esr & ESR_ELx_WNR ? WRITE : READ;
1865#elif defined(__sparc__)
1866 // Decode the instruction to determine the access type.
1867 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype).
1868#if SANITIZER_SOLARIS0
1869 uptr pc = ucontext->uc_mcontext.gregs[REG_PC];
1870#else
1871 // Historical BSDism here.
1872 struct sigcontext *scontext = (struct sigcontext *)context;
1873#if defined(__arch64__)
1874 uptr pc = scontext->sigc_regs.tpc;
1875#else
1876 uptr pc = scontext->si_regs.pc;
1877#endif
1878#endif
1879 u32 instr = *(u32 *)pc;
1880 return (instr >> 21) & 1 ? WRITE: READ;
1881#elif defined(__riscv)
1882#if SANITIZER_FREEBSD0
1883 unsigned long pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc;
1884#else
1885 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC];
1886#endif
1887 unsigned faulty_instruction = *(uint16_t *)pc;
1888
1889#if defined(__riscv_compressed)
1890 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction
1891 // set op_bits to the instruction bits [1, 0, 15, 14, 13]
1892 unsigned op_bits =
1893 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13);
1894 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive
1895 switch (op_bits) {
1896 case 0b10'010: // c.lwsp (rd != x0)
1897#if __riscv_xlen == 64
1898 case 0b10'011: // c.ldsp (rd != x0)
1899#endif
1900 return rd ? SignalContext::READ : SignalContext::UNKNOWN;
1901 case 0b00'010: // c.lw
1902#if __riscv_flen >= 32 && __riscv_xlen == 32
1903 case 0b10'011: // c.flwsp
1904#endif
1905#if __riscv_flen >= 32 || __riscv_xlen == 64
1906 case 0b00'011: // c.flw / c.ld
1907#endif
1908#if __riscv_flen == 64
1909 case 0b00'001: // c.fld
1910 case 0b10'001: // c.fldsp
1911#endif
1912 return SignalContext::READ;
1913 case 0b00'110: // c.sw
1914 case 0b10'110: // c.swsp
1915#if __riscv_flen >= 32 || __riscv_xlen == 64
1916 case 0b00'111: // c.fsw / c.sd
1917 case 0b10'111: // c.fswsp / c.sdsp
1918#endif
1919#if __riscv_flen == 64
1920 case 0b00'101: // c.fsd
1921 case 0b10'101: // c.fsdsp
1922#endif
1923 return SignalContext::WRITE;
1924 default:
1925 return SignalContext::UNKNOWN;
1926 }
1927 }
1928#endif
1929
1930 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits
1931 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive
1932 switch (opcode) {
1933 case 0b0000011: // loads
1934 switch (funct3) {
1935 case 0b000: // lb
1936 case 0b001: // lh
1937 case 0b010: // lw
1938#if __riscv_xlen == 64
1939 case 0b011: // ld
1940#endif
1941 case 0b100: // lbu
1942 case 0b101: // lhu
1943 return SignalContext::READ;
1944 default:
1945 return SignalContext::UNKNOWN;
1946 }
1947 case 0b0100011: // stores
1948 switch (funct3) {
1949 case 0b000: // sb
1950 case 0b001: // sh
1951 case 0b010: // sw
1952#if __riscv_xlen == 64
1953 case 0b011: // sd
1954#endif
1955 return SignalContext::WRITE;
1956 default:
1957 return SignalContext::UNKNOWN;
1958 }
1959#if __riscv_flen >= 32
1960 case 0b0000111: // floating-point loads
1961 switch (funct3) {
1962 case 0b010: // flw
1963#if __riscv_flen == 64
1964 case 0b011: // fld
1965#endif
1966 return SignalContext::READ;
1967 default:
1968 return SignalContext::UNKNOWN;
1969 }
1970 case 0b0100111: // floating-point stores
1971 switch (funct3) {
1972 case 0b010: // fsw
1973#if __riscv_flen == 64
1974 case 0b011: // fsd
1975#endif
1976 return SignalContext::WRITE;
1977 default:
1978 return SignalContext::UNKNOWN;
1979 }
1980#endif
1981 default:
1982 return SignalContext::UNKNOWN;
1983 }
1984#else
1985 (void)ucontext;
1986 return UNKNOWN; // FIXME: Implement.
1987#endif
1988}
1989
1990bool SignalContext::IsTrueFaultingAddress() const {
1991 auto si = static_cast<const siginfo_t *>(siginfo);
1992 // SIGSEGV signals without a true fault address have si_code set to 128.
1993 return si->si_signo == SIGSEGV11 && si->si_code != 128;
1994}
1995
1996void SignalContext::DumpAllRegisters(void *context) {
1997 // FIXME: Implement this.
1998}
1999
2000static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
2001#if SANITIZER_NETBSD0
2002 // This covers all NetBSD architectures
2003 ucontext_t *ucontext = (ucontext_t *)context;
2004 *pc = _UC_MACHINE_PC(ucontext);
2005 *bp = _UC_MACHINE_FP(ucontext);
2006 *sp = _UC_MACHINE_SP(ucontext);
2007#elif defined(__arm__)
2008 ucontext_t *ucontext = (ucontext_t*)context;
2009 *pc = ucontext->uc_mcontext.arm_pc;
2010 *bp = ucontext->uc_mcontext.arm_fp;
2011 *sp = ucontext->uc_mcontext.arm_sp;
2012#elif defined(__aarch64__)
2013 ucontext_t *ucontext = (ucontext_t*)context;
2014 *pc = ucontext->uc_mcontext.pc;
2015 *bp = ucontext->uc_mcontext.regs[29];
2016 *sp = ucontext->uc_mcontext.sp;
2017#elif defined(__hppa__)
2018 ucontext_t *ucontext = (ucontext_t*)context;
2019 *pc = ucontext->uc_mcontext.sc_iaoq[0];
2020 /* GCC uses %r3 whenever a frame pointer is needed. */
2021 *bp = ucontext->uc_mcontext.sc_gr[3];
2022 *sp = ucontext->uc_mcontext.sc_gr[30];
2023#elif defined(__x86_64__1)
2024# if SANITIZER_FREEBSD0
2025 ucontext_t *ucontext = (ucontext_t*)context;
2026 *pc = ucontext->uc_mcontext.mc_rip;
2027 *bp = ucontext->uc_mcontext.mc_rbp;
2028 *sp = ucontext->uc_mcontext.mc_rsp;
2029# else
2030 ucontext_t *ucontext = (ucontext_t*)context;
2031 *pc = ucontext->uc_mcontext.gregs[REG_RIPREG_RIP];
2032 *bp = ucontext->uc_mcontext.gregs[REG_RBPREG_RBP];
2033 *sp = ucontext->uc_mcontext.gregs[REG_RSPREG_RSP];
2034# endif
2035#elif defined(__i386__)
2036# if SANITIZER_FREEBSD0
2037 ucontext_t *ucontext = (ucontext_t*)context;
2038 *pc = ucontext->uc_mcontext.mc_eip;
2039 *bp = ucontext->uc_mcontext.mc_ebp;
2040 *sp = ucontext->uc_mcontext.mc_esp;
2041# else
2042 ucontext_t *ucontext = (ucontext_t*)context;
2043# if SANITIZER_SOLARIS0
2044 /* Use the numeric values: the symbolic ones are undefined by llvm
2045 include/llvm/Support/Solaris.h. */
2046# ifndef REG_EIP
2047# define REG_EIP 14 // REG_PC
2048# endif
2049# ifndef REG_EBP
2050# define REG_EBP 6 // REG_FP
2051# endif
2052# ifndef REG_UESP
2053# define REG_UESP 17 // REG_SP
2054# endif
2055# endif
2056 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
2057 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
2058 *sp = ucontext->uc_mcontext.gregs[REG_UESP];
2059# endif
2060#elif defined(__powerpc__) || defined(__powerpc64__)
2061 ucontext_t *ucontext = (ucontext_t*)context;
2062 *pc = ucontext->uc_mcontext.regs->nip;
2063 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
2064 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
2065 // pointer, but GCC always uses r31 when we need a frame pointer.
2066 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
2067#elif defined(__sparc__)
2068#if defined(__arch64__) || defined(__sparcv9)
2069#define STACK_BIAS 2047
2070#else
2071#define STACK_BIAS 0
2072# endif
2073# if SANITIZER_SOLARIS0
2074 ucontext_t *ucontext = (ucontext_t *)context;
2075 *pc = ucontext->uc_mcontext.gregs[REG_PC];
2076 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS;
2077#else
2078 // Historical BSDism here.
2079 struct sigcontext *scontext = (struct sigcontext *)context;
2080#if defined(__arch64__)
2081 *pc = scontext->sigc_regs.tpc;
2082 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS;
2083#else
2084 *pc = scontext->si_regs.pc;
2085 *sp = scontext->si_regs.u_regs[14];
2086#endif
2087# endif
2088 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS;
2089#elif defined(__mips__)
2090 ucontext_t *ucontext = (ucontext_t*)context;
2091 *pc = ucontext->uc_mcontext.pc;
2092 *bp = ucontext->uc_mcontext.gregs[30];
2093 *sp = ucontext->uc_mcontext.gregs[29];
2094#elif defined(__s390__)
2095 ucontext_t *ucontext = (ucontext_t*)context;
2096# if defined(__s390x__)
2097 *pc = ucontext->uc_mcontext.psw.addr;
2098# else
2099 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
2100# endif
2101 *bp = ucontext->uc_mcontext.gregs[11];
2102 *sp = ucontext->uc_mcontext.gregs[15];
2103#elif defined(__riscv)
2104 ucontext_t *ucontext = (ucontext_t*)context;
2105# if SANITIZER_FREEBSD0
2106 *pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc;
2107 *bp = ucontext->uc_mcontext.mc_gpregs.gp_s[0];
2108 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp;
2109# else
2110 *pc = ucontext->uc_mcontext.__gregs[REG_PC];
2111 *bp = ucontext->uc_mcontext.__gregs[REG_S0];
2112 *sp = ucontext->uc_mcontext.__gregs[REG_SP];
2113# endif
2114# elif defined(__hexagon__)
2115 ucontext_t *ucontext = (ucontext_t *)context;
2116 *pc = ucontext->uc_mcontext.pc;
2117 *bp = ucontext->uc_mcontext.r30;
2118 *sp = ucontext->uc_mcontext.r29;
2119# else
2120# error "Unsupported arch"
2121# endif
2122}
2123
2124void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
2125
2126void InitializePlatformEarly() {
2127 // Do nothing.
2128}
2129
2130void MaybeReexec() {
2131 // No need to re-exec on Linux.
2132}
2133
2134void CheckASLR() {
2135#if SANITIZER_NETBSD0
2136 int mib[3];
2137 int paxflags;
2138 uptr len = sizeof(paxflags);
2139
2140 mib[0] = CTL_PROC;
2141 mib[1] = internal_getpid();
2142 mib[2] = PROC_PID_PAXFLAGS;
2143
2144 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctl(mib, 3, &paxflags, &
len, __null, 0) == -1), 0)) {
2145 Printf("sysctl failed\n");
2146 Die();
2147 }
2148
2149 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)__builtin_expect(!!(paxflags & CTL_PROC_PAXFLAGS_ASLR), 0
)) {
2150 Printf("This sanitizer is not compatible with enabled ASLR.\n"
2151 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n",
2152 GetArgv()[0]);
2153 Die();
2154 }
2155#elif SANITIZER_PPC64V20
2156 // Disable ASLR for Linux PPC64LE.
2157 int old_personality = personality(0xffffffff);
2158 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
2159 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)
2160 "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)
2161 "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)
2162 "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);
2163 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 2163, "(" "(personality(old_personality | ADDR_NO_RANDOMIZE))"
") " "!=" " (" "(-1)" ")", v1, v2); } while (false);
2164 ReExec();
2165 }
2166#elif SANITIZER_FREEBSD0
2167 int aslr_pie;
2168 uptr len = sizeof(aslr_pie);
2169#if SANITIZER_WORDSIZE64 == 64
2170 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)
2171 &aslr_pie, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctlbyname("kern.elf64.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)) {
2172 // We're making things less 'dramatic' here since
2173 // the OID is not necessarily guaranteed to be here
2174 // just yet regarding FreeBSD release
2175 return;
2176 }
2177
2178 if (aslr_pie > 0) {
2179 Printf("This sanitizer is not compatible with enabled ASLR "
2180 "and binaries compiled with PIE\n");
2181 Die();
2182 }
2183#endif
2184 // there might be 32 bits compat for 64 bits
2185 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)
2186 &aslr_pie, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctlbyname("kern.elf32.aslr.pie_enable"
, &aslr_pie, &len, __null, 0) == -1), 0)) {
2187 return;
2188 }
2189
2190 if (aslr_pie > 0) {
2191 Printf("This sanitizer is not compatible with enabled ASLR "
2192 "and binaries compiled with PIE\n");
2193 Die();
2194 }
2195#else
2196 // Do nothing
2197#endif
2198}
2199
2200void CheckMPROTECT() {
2201#if SANITIZER_NETBSD0
2202 int mib[3];
2203 int paxflags;
2204 uptr len = sizeof(paxflags);
2205
2206 mib[0] = CTL_PROC;
2207 mib[1] = internal_getpid();
2208 mib[2] = PROC_PID_PAXFLAGS;
2209
2210 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)__builtin_expect(!!(internal_sysctl(mib, 3, &paxflags, &
len, __null, 0) == -1), 0)) {
2211 Printf("sysctl failed\n");
2212 Die();
2213 }
2214
2215 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)__builtin_expect(!!(paxflags & CTL_PROC_PAXFLAGS_MPROTECT
), 0)) {
2216 Printf("This sanitizer is not compatible with enabled MPROTECT\n");
2217 Die();
2218 }
2219#else
2220 // Do nothing
2221#endif
2222}
2223
2224void CheckNoDeepBind(const char *filename, int flag) {
2225#ifdef RTLD_DEEPBIND0x00008
2226 if (flag & RTLD_DEEPBIND0x00008) {
2227 Report(
2228 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
2229 " which is incompatible with sanitizer runtime "
2230 "(see https://github.com/google/sanitizers/issues/611 for details"
2231 "). If you want to run %s library under sanitizers please remove "
2232 "RTLD_DEEPBIND from dlopen flags.\n",
2233 filename, filename);
2234 Die();
2235 }
2236#endif
2237}
2238
2239uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
2240 uptr *largest_gap_found,
2241 uptr *max_occupied_addr) {
2242 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-14~++20210828111110+16086d47c0d0/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp"
, 2242, "(" "(0 && \"FindAvailableMemoryRange is not available\")"
") " "!=" " (" "0" ")", v1, v2); } while (false); Die(); } while
(0);
2243 return 0;
2244}
2245
2246bool GetRandom(void *buffer, uptr length, bool blocking) {
2247 if (!buffer || !length || length > 256)
2248 return false;
2249#if SANITIZER_USE_GETENTROPY0
2250 uptr rnd = getentropy(buffer, length);
2251 int rverrno = 0;
2252 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT14)
2253 return false;
2254 else if (rnd == 0)
2255 return true;
2256#endif // SANITIZER_USE_GETENTROPY
2257
2258#if SANITIZER_USE_GETRANDOM1
2259 static atomic_uint8_t skip_getrandom_syscall;
2260 if (!atomic_load_relaxed(&skip_getrandom_syscall)) {
2261 // Up to 256 bytes, getrandom will not be interrupted.
2262 uptr res = internal_syscall(SYSCALL(getrandom)318, buffer, length,
2263 blocking ? 0 : GRND_NONBLOCK1);
2264 int rverrno = 0;
2265 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS38)
2266 atomic_store_relaxed(&skip_getrandom_syscall, 1);
2267 else if (res == length)
2268 return true;
2269 }
2270#endif // SANITIZER_USE_GETRANDOM
2271 // Up to 256 bytes, a read off /dev/urandom will not be interrupted.
2272 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom.
2273 uptr fd = internal_open("/dev/urandom", O_RDONLY00);
2274 if (internal_iserror(fd))
2275 return false;
2276 uptr res = internal_read(fd, buffer, length);
2277 if (internal_iserror(res))
2278 return false;
2279 internal_close(fd);
2280 return true;
2281}
2282
2283} // namespace __sanitizer
2284
2285#endif
←

/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/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}