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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2023-07-11 10:50:58 +0900 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-08-02 16:27:07 +0200 |
| commit | b65413768abd27a55af74945aec58127a52b30a8 (patch) | |
| tree | 1d9c2172862d662d72a06ad9d5251bc9b152ac1e /tools/arch | |
| parent | d7114f83ee051dfeac82546d7ba03d74f8b92af3 (diff) | |
x86/kprobes: Prohibit probing on compiler generated CFI checking code
Prohibit probing on the compiler generated CFI typeid checking code
because it is used for decoding typeid when CFI error happens.
The compiler generates the following instruction sequence for indirect
call checks on x86;
movl -<id>, %r10d ; 6 bytes
addl -4(%reg), %r10d ; 4 bytes
je .Ltmp1 ; 2 bytes
ud2 ; <- regs->ip
And handle_cfi_failure() decodes these instructions (movl and addl)
for the typeid and the target address. Thus if we put a kprobe on
those instructions, the decode will fail and report a wrong typeid
and target address.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/168904025785.116016.12766408611437534723.stgit@devnote2
Diffstat (limited to 'tools/arch')
0 files changed, 0 insertions, 0 deletions