riscv: blacklist assembly symbols for kprobe

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[ Upstream commit 5014396af9 ]

Adding kprobes on some assembly functions (mainly exception handling)
will result in crashes (either recursive trap or panic). To avoid such
errors, add ASM_NOKPROBE() macro which allow adding specific symbols
into the __kprobe_blacklist section and use to blacklist the following
symbols that showed to be problematic:
- handle_exception()
- ret_from_exception()
- handle_kernel_stack_overflow()

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20231004131009.409193-1-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Clément Léger 2023-10-04 15:10:09 +02:00 • committed by Greg Kroah-Hartman

parent 18b9264a13

commit d5a9588cc3

2 changed files with 13 additions and 0 deletions

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10

arch/riscv/include/asm/asm.h

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3

arch/riscv/kernel/entry.S

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