maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[compiler-rt][Darwin] Disable EXC_GUARD exceptions 

ASan/TSan use mmap in a way that creates “deallocation gaps” which
triggers EXC_GUARD exceptions on macOS 10.15+ (XNU 19.0+).  Let's
suppress those.
This commit is contained in:
Julian Lettner 2020-07-29 09:55:52 -07:00
parent c114352edf
commit 7e946d0c82
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
View File

@ -831,6 +831,19 @@ void SignalContext::InitPcSpBp() {
GetPcSpBp(context, &pc, &sp, &bp);
}
// ASan/TSan use mmap in a way that creates “deallocation gaps” which triggers
// EXC_GUARD exceptions on macOS 10.15+ (XNU 19.0+).
static void DisableMmapExcGuardExceptions() {
using task_exc_guard_behavior_t = uint32_t;
using task_set_exc_guard_behavior_t =
kern_return_t(task_t task, task_exc_guard_behavior_t behavior);
auto *set_behavior = (task_set_exc_guard_behavior_t *)dlsym(
RTLD_DEFAULT, "task_set_exc_guard_behavior");
if (set_behavior == nullptr) return;
const task_exc_guard_behavior_t task_exc_guard_none = 0;
set_behavior(mach_task_self(), task_exc_guard_none);
}
void InitializePlatformEarly() {
// Only use xnu_fast_mmap when on x86_64 and the kernel supports it.
use_xnu_fast_mmap =
@ -839,6 +852,8 @@ void InitializePlatformEarly() {
#else
false;
#endif
if (GetDarwinKernelVersion() >= DarwinKernelVersion(19, 0))
DisableMmapExcGuardExceptions();
}
#if !SANITIZER_GO