arm64: Recover kretprobe modified return address in stacktrace

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Since the kretprobe replaces the function return address with
the kretprobe_trampoline on the stack, stack unwinder shows it
instead of the correct return address.

This checks whether the next return address is the
__kretprobe_trampoline(), and if so, try to find the correct
return address from the kretprobe instance list. For this purpose
this adds 'kr_cur' loop cursor to memorize the current kretprobe
instance.

With this fix, now arm64 can enable
CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE, and pass the
kprobe self tests.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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This commit is contained in:

Masami Hiramatsu 2021-10-21 09:55:09 +09:00 • committed by Steven Rostedt (VMware)

parent fc6d647638

commit cd9bc2c925

3 changed files with 12 additions and 0 deletions

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1

arch/arm64/Kconfig

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4

arch/arm64/include/asm/stacktrace.h

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7

arch/arm64/kernel/stacktrace.c

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