diff options
Diffstat (limited to 'lib/asan/asan_posix.cc')
| -rw-r--r-- | lib/asan/asan_posix.cc | 56 |
1 files changed, 3 insertions, 53 deletions
diff --git a/lib/asan/asan_posix.cc b/lib/asan/asan_posix.cc index added746ace8..17c28b0aea2a 100644 --- a/lib/asan/asan_posix.cc +++ b/lib/asan/asan_posix.cc @@ -25,7 +25,6 @@ #include "sanitizer_common/sanitizer_procmaps.h" #include <pthread.h> -#include <signal.h> #include <stdlib.h> #include <sys/time.h> #include <sys/resource.h> @@ -34,58 +33,9 @@ namespace __asan { void AsanOnDeadlySignal(int signo, void *siginfo, void *context) { - ScopedDeadlySignal signal_scope(GetCurrentThread()); - int code = (int)((siginfo_t*)siginfo)->si_code; - // Write the first message using fd=2, just in case. - // It may actually fail to write in case stderr is closed. - internal_write(2, "ASAN:DEADLYSIGNAL\n", 18); - SignalContext sig = SignalContext::Create(siginfo, context); - - // Access at a reasonable offset above SP, or slightly below it (to account - // for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is - // probably a stack overflow. -#ifdef __s390__ - // On s390, the fault address in siginfo points to start of the page, not - // to the precise word that was accessed. Mask off the low bits of sp to - // take it into account. - bool IsStackAccess = sig.addr >= (sig.sp & ~0xFFF) && - sig.addr < sig.sp + 0xFFFF; -#else - bool IsStackAccess = sig.addr + 512 > sig.sp && sig.addr < sig.sp + 0xFFFF; -#endif - -#if __powerpc__ - // Large stack frames can be allocated with e.g. - // lis r0,-10000 - // stdux r1,r1,r0 # store sp to [sp-10000] and update sp by -10000 - // If the store faults then sp will not have been updated, so test above - // will not work, because the fault address will be more than just "slightly" - // below sp. - if (!IsStackAccess && IsAccessibleMemoryRange(sig.pc, 4)) { - u32 inst = *(unsigned *)sig.pc; - u32 ra = (inst >> 16) & 0x1F; - u32 opcd = inst >> 26; - u32 xo = (inst >> 1) & 0x3FF; - // Check for store-with-update to sp. The instructions we accept are: - // stbu rs,d(ra) stbux rs,ra,rb - // sthu rs,d(ra) sthux rs,ra,rb - // stwu rs,d(ra) stwux rs,ra,rb - // stdu rs,ds(ra) stdux rs,ra,rb - // where ra is r1 (the stack pointer). - if (ra == 1 && - (opcd == 39 || opcd == 45 || opcd == 37 || opcd == 62 || - (opcd == 31 && (xo == 247 || xo == 439 || xo == 183 || xo == 181)))) - IsStackAccess = true; - } -#endif // __powerpc__ - - // We also check si_code to filter out SEGV caused by something else other - // then hitting the guard page or unmapped memory, like, for example, - // unaligned memory access. - if (IsStackAccess && (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR)) - ReportStackOverflow(sig); - else - ReportDeadlySignal(signo, sig); + StartReportDeadlySignal(); + SignalContext sig(siginfo, context); + ReportDeadlySignal(sig); } // ---------------------- TSD ---------------- {{{1 |