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| author | Kito Cheng <kito.cheng@sifive.com> | 2024-11-15 12:14:54 +0800 |
|---|---|---|
| committer | Kito Cheng <kito.cheng@sifive.com> | 2024-11-25 06:34:33 +0000 |
| commit | 63c68752768fd6d67c695e09c85e0e1ca59cd6d4 (patch) | |
| tree | db22e5ec77d788752b497e3f8246f8a66096a2ec /gcc/system.h | |
| parent | e4f4b2dc08b6720acab563db48fd4b0427d2b0c6 (diff) | |
| download | gcc-63c68752768fd6d67c695e09c85e0e1ca59cd6d4.zip gcc-63c68752768fd6d67c695e09c85e0e1ca59cd6d4.tar.gz gcc-63c68752768fd6d67c695e09c85e0e1ca59cd6d4.tar.bz2 | |
asan: Support dynamic shadow offset
AddressSanitizer has supported dynamic shadow offsets since 2016[1], but
GCC hasn't implemented this yet because targets using dynamic shadow
offsets, such as Fuchsia and iOS, are mostly unsupported in GCC.
However, RISC-V 64 switched to dynamic shadow offsets this year[2] because
virtual memory space support varies across different RISC-V cores, such as
Sv39, Sv48, and Sv57. We realized that the best way to handle this
situation is by using a dynamic shadow offset to obtain the offset at
runtime.
We introduce a new target hook, TARGET_ASAN_DYNAMIC_SHADOW_OFFSET_P, to
determine if the target is using a dynamic shadow offset, so this change
won't affect the static offset path. Additionally, TARGET_ASAN_SHADOW_OFFSET
continues to work even if TARGET_ASAN_DYNAMIC_SHADOW_OFFSET_P is non-zero,
ensuring that KASAN functions as expected.
This patch set has been verified on the Banana Pi F3, currently one of the
most popular RISC-V development boards. All AddressSanitizer-related tests
passed without introducing new regressions.
It was also verified on AArch64 and x86_64 with no regressions in
AddressSanitizer.
[1] https://github.com/llvm/llvm-project/commit/130a190bf08a3d955d9db24dac936159dc049e12
[2] https://github.com/llvm/llvm-project/commit/da0c8b275564f814a53a5c19497669ae2d99538d
gcc/ChangeLog:
* asan.cc (asan_dynamic_shadow_offset_p): New.
(asan_shadow_memory_dynamic_address): New.
(asan_local_shadow_memory_dynamic_address): New.
(get_asan_shadow_memory_dynamic_address_decl): New.
(asan_maybe_insert_dynamic_shadow_at_function_entry): New.
(asan_emit_stack_protection): Support dynamic shadow offset.
(build_shadow_mem_access): Ditto.
* asan.h (asan_maybe_insert_dynamic_shadow_at_function_entry): New.
* doc/tm.texi (TARGET_ASAN_DYNAMIC_SHADOW_OFFSET_P): New.
* doc/tm.texi.in (TARGET_ASAN_DYNAMIC_SHADOW_OFFSET_P): Ditto.
* sanopt.cc (pass_sanopt::execute): Handle dynamic shadow offset.
* target.def (asan_dynamic_shadow_offset_p): New.
* toplev.cc (process_options): Handle dynamic shadow offset.
Diffstat (limited to 'gcc/system.h')
0 files changed, 0 insertions, 0 deletions