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| author |  Peter Collingbourne <pcc@google.com>
| 2020-11-20 12:33:46 -0800 |
|---|---|---|
| committer |  Catalin Marinas <catalin.marinas@arm.com>
| 2020-11-23 18:17:39 +0000 |
| commit | dceec3ff78076757311d92a388d50d0251fb7dbb (patch) | |
| tree | e51d2de16335fcd21dce9f5342846d5e868b14ad /arch/arm64/include/asm/exception.h | |
| parent | signal: define the SA_EXPOSE_TAGBITS bit in sa_flags (diff) | |
| download | linux-dceec3ff78076757311d92a388d50d0251fb7dbb.tar.gz linux-dceec3ff78076757311d92a388d50d0251fb7dbb.tar.bz2 linux-dceec3ff78076757311d92a388d50d0251fb7dbb.zip | |
arm64: expose FAR_EL1 tag bits in siginfo
The kernel currently clears the tag bits (i.e. bits 56-63) in the fault
address exposed via siginfo.si_addr and sigcontext.fault_address. However,
the tag bits may be needed by tools in order to accurately diagnose
memory errors, such as HWASan [1] or future tools based on the Memory
Tagging Extension (MTE).
Expose these bits via the arch_untagged_si_addr mechanism, so that
they are only exposed to signal handlers with the SA_EXPOSE_TAGBITS
flag set.
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://linux-review.googlesource.com/id/Ia8876bad8c798e0a32df7c2ce1256c4771c81446
Link: https://lore.kernel.org/r/0010296597784267472fa13b39f8238d87a72cf8.1605904350.git.pcc@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/exception.h')
| -rw-r--r-- | arch/arm64/include/asm/exception.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h index 99b9383cd036..2a8aa1884d8a 100644 --- a/arch/arm64/include/asm/exception.h +++ b/arch/arm64/include/asm/exception.h @@ -32,7 +32,7 @@ static inline u32 disr_to_esr(u64 disr) } asmlinkage void enter_from_user_mode(void); -void do_mem_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs); +void do_mem_abort(unsigned long far, unsigned int esr, struct pt_regs *regs); void do_undefinstr(struct pt_regs *regs); void do_bti(struct pt_regs *regs); asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr); |