x86/ibt,kprobes: Cure sym+0 equals fentry woes

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In order to allow kprobes to skip the ENDBR instructions at sym+0 for
X86_KERNEL_IBT builds, change _kprobe_addr() to take an architecture
callback to inspect the function at hand and modify the offset if
needed.

This streamlines the existing interface to cover more cases and
require less hooks. Once PowerPC gets fully converted there will only
be the one arch hook.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.405947704@infradead.org

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This commit is contained in:

Peter Zijlstra 2022-03-08 16:30:32 +01:00

parent e52fc2cf3f

commit cc66bb9145

4 changed files with 92 additions and 28 deletions

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34

arch/powerpc/kernel/kprobes.c

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17

arch/x86/kernel/kprobes/core.c

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3

include/linux/kprobes.h

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66

kernel/kprobes.c

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