diff options
Diffstat (limited to 'compiler-rt/lib/asan/asan_posix.cpp')
| -rw-r--r-- | compiler-rt/lib/asan/asan_posix.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/compiler-rt/lib/asan/asan_posix.cpp b/compiler-rt/lib/asan/asan_posix.cpp index 920d216624a3..d7f19d846544 100644 --- a/compiler-rt/lib/asan/asan_posix.cpp +++ b/compiler-rt/lib/asan/asan_posix.cpp @@ -17,6 +17,7 @@ #include "asan_internal.h" #include "asan_interceptors.h" #include "asan_mapping.h" +#include "asan_poisoning.h" #include "asan_report.h" #include "asan_stack.h" #include "sanitizer_common/sanitizer_libc.h" @@ -24,6 +25,7 @@ #include "sanitizer_common/sanitizer_procmaps.h" #include <pthread.h> +#include <signal.h> #include <stdlib.h> #include <sys/time.h> #include <sys/resource.h> @@ -37,6 +39,32 @@ void AsanOnDeadlySignal(int signo, void *siginfo, void *context) { ReportDeadlySignal(sig); } +bool PlatformUnpoisonStacks() { + stack_t signal_stack; + CHECK_EQ(0, sigaltstack(nullptr, &signal_stack)); + uptr sigalt_bottom = (uptr)signal_stack.ss_sp; + uptr sigalt_top = (uptr)((char *)signal_stack.ss_sp + signal_stack.ss_size); + // If we're executing on the signal alternate stack AND the Linux flag + // SS_AUTODISARM was used, then we cannot get the signal alternate stack + // bounds from sigaltstack -- sigaltstack's output looks just as if no + // alternate stack has ever been set up. + // We're always unpoisoning the signal alternate stack to support jumping + // between the default stack and signal alternate stack. + if (signal_stack.ss_flags != SS_DISABLE) + UnpoisonStack(sigalt_bottom, sigalt_top, "sigalt"); + + if (signal_stack.ss_flags != SS_ONSTACK) + return false; + + // Since we're on the signal altnerate stack, we cannot find the DEFAULT + // stack bottom using a local variable. + uptr default_bottom, tls_addr, tls_size, stack_size; + GetThreadStackAndTls(/*main=*/false, &default_bottom, &stack_size, &tls_addr, + &tls_size); + UnpoisonStack(default_bottom, default_bottom + stack_size, "default"); + return true; +} + // ---------------------- TSD ---------------- {{{1 #if SANITIZER_NETBSD && !ASAN_DYNAMIC |