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When building with CONFIG_UBSAN_TRAP=y on arm64, Clang encodes the UBSAN check (handler) type in the esr. Extract this and actually report these traps as coming from the specific UBSAN check that tripped. Before: Internal error: BRK handler: 00000000f20003e8 [#1] PREEMPT SMP After: Internal error: UBSAN: shift out of bounds: 00000000f2005514 [#1] PREEMPT SMP Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Mukesh Ojha <quic_mojha@quicinc.com> Reviewed-by: Fangrui Song <maskray@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: John Stultz <jstultz@google.com> Cc: Yongqin Liu <yongqin.liu@linaro.org> Cc: Sami Tolvanen <samitolvanen@google.com> Cc: Yury Norov <yury.norov@gmail.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Marco Elver <elver@google.com> Cc: linux-arm-kernel@lists.infradead.org Cc: llvm@lists.linux.dev Signed-off-by: Kees Cook <keescook@chromium.org>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_BRK_IMM_H
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#define __ASM_BRK_IMM_H
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/*
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* #imm16 values used for BRK instruction generation
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* 0x004: for installing kprobes
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* 0x005: for installing uprobes
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* 0x006: for kprobe software single-step
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* Allowed values for kgdb are 0x400 - 0x7ff
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* 0x100: for triggering a fault on purpose (reserved)
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* 0x400: for dynamic BRK instruction
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* 0x401: for compile time BRK instruction
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* 0x800: kernel-mode BUG() and WARN() traps
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* 0x9xx: tag-based KASAN trap (allowed values 0x900 - 0x9ff)
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* 0x55xx: Undefined Behavior Sanitizer traps ('U' << 8)
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* 0x8xxx: Control-Flow Integrity traps
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*/
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#define KPROBES_BRK_IMM 0x004
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#define UPROBES_BRK_IMM 0x005
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#define KPROBES_BRK_SS_IMM 0x006
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#define FAULT_BRK_IMM 0x100
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#define KGDB_DYN_DBG_BRK_IMM 0x400
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#define KGDB_COMPILED_DBG_BRK_IMM 0x401
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#define BUG_BRK_IMM 0x800
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#define KASAN_BRK_IMM 0x900
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#define KASAN_BRK_MASK 0x0ff
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#define UBSAN_BRK_IMM 0x5500
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#define UBSAN_BRK_MASK 0x00ff
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#define CFI_BRK_IMM_TARGET GENMASK(4, 0)
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#define CFI_BRK_IMM_TYPE GENMASK(9, 5)
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#define CFI_BRK_IMM_BASE 0x8000
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#define CFI_BRK_IMM_MASK (CFI_BRK_IMM_TARGET | CFI_BRK_IMM_TYPE)
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#endif
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