diff options
Diffstat (limited to 'absl/debugging/failure_signal_handler.cc')
| -rw-r--r-- | absl/debugging/failure_signal_handler.cc | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/absl/debugging/failure_signal_handler.cc b/absl/debugging/failure_signal_handler.cc index 5e8f0b05..9f399d02 100644 --- a/absl/debugging/failure_signal_handler.cc +++ b/absl/debugging/failure_signal_handler.cc @@ -33,6 +33,10 @@ #include <sys/mman.h> #endif +#ifdef __linux__ +#include <sys/prctl.h> +#endif + #include <algorithm> #include <atomic> #include <cerrno> @@ -138,7 +142,8 @@ static bool SetupAlternateStackOnce() { const size_t page_mask = static_cast<size_t>(sysconf(_SC_PAGESIZE)) - 1; #endif size_t stack_size = - (std::max<size_t>(SIGSTKSZ, 65536) + page_mask) & ~page_mask; + (std::max(static_cast<size_t>(SIGSTKSZ), size_t{65536}) + page_mask) & + ~page_mask; #if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \ defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER) // Account for sanitizer instrumentation requiring additional stack space. @@ -171,6 +176,20 @@ static bool SetupAlternateStackOnce() { if (sigaltstack(&sigstk, nullptr) != 0) { ABSL_RAW_LOG(FATAL, "sigaltstack() failed with errno=%d", errno); } + +#ifdef __linux__ +#if defined(PR_SET_VMA) && defined(PR_SET_VMA_ANON_NAME) + // Make a best-effort attempt to name the allocated region in + // /proc/$PID/smaps. + // + // The call to prctl() may fail if the kernel was not configured with the + // CONFIG_ANON_VMA_NAME kernel option. This is OK since the call is + // primarily a debugging aid. + prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, sigstk.ss_sp, sigstk.ss_size, + "absl-signalstack"); +#endif +#endif // __linux__ + return true; } |