1ad9551f1d
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> (cherry picked from commit dceec3ff78076757311d92a388d50d0251fb7dbb) [pcc: resolved minor conflicts in arch/arm64/include/asm/exception.h and arch/arm64/mm/fault.c] Bug: 135772972 Change-Id: Ia8876bad8c798e0a32df7c2ce1256c4771c81446
38 lines
868 B
C
38 lines
868 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/system_misc.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_SYSTEM_MISC_H
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#define __ASM_SYSTEM_MISC_H
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#ifndef __ASSEMBLY__
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <linux/irqflags.h>
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#include <linux/signal.h>
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#include <linux/ratelimit.h>
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#include <linux/reboot.h>
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struct pt_regs;
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void die(const char *msg, struct pt_regs *regs, int err);
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struct siginfo;
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void arm64_notify_die(const char *str, struct pt_regs *regs,
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int signo, int sicode, unsigned long far,
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int err);
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void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
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struct pt_regs *),
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int sig, int code, const char *name);
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struct mm_struct;
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extern void __show_regs(struct pt_regs *);
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SYSTEM_MISC_H */
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