x86/kprobes: Push a fake return address at kretprobe_trampoline

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Change __kretprobe_trampoline() to push the address of the
__kretprobe_trampoline() as a fake return address at the bottom
of the stack frame. This fake return address will be replaced
with the correct return address in the trampoline_handler().

With this change, the ORC unwinder can check whether the return
address is modified by kretprobes or not.

Link: https://lkml.kernel.org/r/163163054185.489837.14338744048957727386.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

...

This commit is contained in:

Masami Hiramatsu 2021-09-14 23:42:22 +09:00 • committed by Steven Rostedt (VMware)

parent df91c5bccb

commit 1f36839308

1 changed files with 25 additions and 9 deletions

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arch/x86/kernel/kprobes/core.c

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