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| author |   Masami Hiramatsu <mhiramat@kernel.org> | 2021-03-25 19:08:31 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-03-25 11:37:21 +0100 |
| commit | 6dd3b8c9f58816a1354be39559f630cd1bd12159 (patch) | |
| tree | b56890da4523ca722bdc20aaf84a47532b658797 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | x86/kprobes: Use int3 instead of debug trap for single-step (diff) | |
| download | wireguard-linux-6dd3b8c9f58816a1354be39559f630cd1bd12159.tar.xz wireguard-linux-6dd3b8c9f58816a1354be39559f630cd1bd12159.zip | |
x86/kprobes: Fix to check non boostable prefixes correctly
There are 2 bugs in the can_boost() function because of using
x86 insn decoder. Since the insn->opcode never has a prefix byte,
it can not find CS override prefix in it. And the insn->attr is
the attribute of the opcode, thus inat_is_address_size_prefix(
insn->attr) always returns false.
Fix those by checking each prefix bytes with for_each_insn_prefix
loop and getting the correct attribute for each prefix byte.
Also, this removes unlikely, because this is a slow path.
Fixes: a8d11cd0714f ("kprobes/x86: Consolidate insn decoder users for copying code")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/161666691162.1120877.2808435205294352583.stgit@devnote2
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