mirror of
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134 lines
4.2 KiB
C++
134 lines
4.2 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_posix.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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const char *DescribeSignalOrException(int signo) {
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switch (signo) {
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case SIGFPE:
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return "FPE";
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case SIGILL:
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return "ILL";
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case SIGABRT:
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return "ABRT";
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default:
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return "SEGV";
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}
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}
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void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
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ScopedDeadlySignal signal_scope(GetCurrentThread());
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int code = (int)((siginfo_t*)siginfo)->si_code;
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// Write the first message using fd=2, just in case.
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// It may actually fail to write in case stderr is closed.
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internal_write(2, "ASAN:DEADLYSIGNAL\n", 18);
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SignalContext sig = SignalContext::Create(siginfo, context);
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// Access at a reasonable offset above SP, or slightly below it (to account
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// for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
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// probably a stack overflow.
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#ifdef __s390__
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// On s390, the fault address in siginfo points to start of the page, not
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// to the precise word that was accessed. Mask off the low bits of sp to
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// take it into account.
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bool IsStackAccess = sig.addr >= (sig.sp & ~0xFFF) &&
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sig.addr < sig.sp + 0xFFFF;
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#else
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bool IsStackAccess = sig.addr + 512 > sig.sp && sig.addr < sig.sp + 0xFFFF;
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#endif
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#if __powerpc__
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// Large stack frames can be allocated with e.g.
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// lis r0,-10000
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// stdux r1,r1,r0 # store sp to [sp-10000] and update sp by -10000
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// If the store faults then sp will not have been updated, so test above
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// will not work, becase the fault address will be more than just "slightly"
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// below sp.
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if (!IsStackAccess && IsAccessibleMemoryRange(sig.pc, 4)) {
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u32 inst = *(unsigned *)sig.pc;
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u32 ra = (inst >> 16) & 0x1F;
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u32 opcd = inst >> 26;
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u32 xo = (inst >> 1) & 0x3FF;
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// Check for store-with-update to sp. The instructions we accept are:
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// stbu rs,d(ra) stbux rs,ra,rb
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// sthu rs,d(ra) sthux rs,ra,rb
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// stwu rs,d(ra) stwux rs,ra,rb
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// stdu rs,ds(ra) stdux rs,ra,rb
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// where ra is r1 (the stack pointer).
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if (ra == 1 &&
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(opcd == 39 || opcd == 45 || opcd == 37 || opcd == 62 ||
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(opcd == 31 && (xo == 247 || xo == 439 || xo == 183 || xo == 181))))
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IsStackAccess = true;
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}
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#endif // __powerpc__
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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 (IsStackAccess && (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
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ReportStackOverflow(sig);
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else
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ReportDeadlySignal(signo, sig);
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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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