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author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2018-08-16 20:46:41 +0000 |
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committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2018-08-16 20:46:41 +0000 |
commit | 006c035e3b2ee510449506de2903d3c7fb7784da (patch) | |
tree | 4d45324e510147a981fd9da55079e8f570219266 /compiler-rt/include | |
parent | 4b9569516e45e139c8fd6b821f861bd9e7539fff (diff) |
[hwasan] Add __hwasan_handle_longjmp.
Summary:
A callback to annotate longjmp-like code.
Unlike __asan_handle_no_return, in hwasan we can not conservatively
"unpoison" the entire thread stack, because there is no such thing as
unpoisoned memory. Pointer and memory tags must always match.
Reviewers: vitalybuka, kcc
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D50752
Diffstat (limited to 'compiler-rt/include')
-rw-r--r-- | compiler-rt/include/sanitizer/hwasan_interface.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/compiler-rt/include/sanitizer/hwasan_interface.h b/compiler-rt/include/sanitizer/hwasan_interface.h index 9ca73bc1072..78644aa9d4f 100644 --- a/compiler-rt/include/sanitizer/hwasan_interface.h +++ b/compiler-rt/include/sanitizer/hwasan_interface.h @@ -40,6 +40,13 @@ extern "C" { /// Set pointer tag. Previous tag is lost. void *__hwasan_tag_pointer(const volatile void *p, unsigned char tag); + // Set memory tag from the current SP address to the given address to zero. + // This is meant to annotate longjmp and other non-local jumps. + // This function needs to know the (almost) exact destination frame address; + // clearing shadow for the entire thread stack like __asan_handle_no_return + // does would cause false reports. + void __hwasan_handle_longjmp(const void *sp_dst); + // Print shadow and origin for the memory range to stderr in a human-readable // format. void __hwasan_print_shadow(const volatile void *x, size_t size); |