86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
//===-- asan_posix.cc -----------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Posix-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_POSIX
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#include "asan_internal.h"
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#include "asan_interceptors.h"
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#include "asan_mapping.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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namespace __asan {
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void AsanOnSIGSEGV(int, void *siginfo, void *context) {
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uptr addr = (uptr)((siginfo_t*)siginfo)->si_addr;
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int code = (int)((siginfo_t*)siginfo)->si_code;
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// Write the first message using the bullet-proof write.
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if (13 != internal_write(2, "ASAN:SIGSEGV\n", 13)) Die();
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uptr pc, sp, bp;
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GetPcSpBp(context, &pc, &sp, &bp);
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// Access at a reasonable offset above SP, or slightly below it (to account
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// for x86_64 redzone, ARM push of multiple registers, etc) is probably a
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// stack overflow.
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// We also check si_code to filter out SEGV caused by something else other
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// then hitting the guard page or unmapped memory, like, for example,
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// unaligned memory access.
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if (addr + 128 > sp && addr < sp + 0xFFFF &&
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(code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
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ReportStackOverflow(pc, sp, bp, context, addr);
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else
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ReportSIGSEGV("SEGV", pc, sp, bp, context, addr);
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}
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// ---------------------- TSD ---------------- {{{1
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static pthread_key_t tsd_key;
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static bool tsd_key_inited = false;
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void AsanTSDInit(void (*destructor)(void *tsd)) {
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CHECK(!tsd_key_inited);
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tsd_key_inited = true;
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CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
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}
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void *AsanTSDGet() {
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CHECK(tsd_key_inited);
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return pthread_getspecific(tsd_key);
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}
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void AsanTSDSet(void *tsd) {
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CHECK(tsd_key_inited);
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pthread_setspecific(tsd_key, tsd);
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}
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void PlatformTSDDtor(void *tsd) {
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AsanThreadContext *context = (AsanThreadContext*)tsd;
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if (context->destructor_iterations > 1) {
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context->destructor_iterations--;
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CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
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return;
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}
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AsanThread::TSDDtor(tsd);
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}
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} // namespace __asan
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#endif // SANITIZER_POSIX
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