Masami Hiramatsu 296da2049f x86/kprobes: Fix to check non boostable prefixes correctly ...

[ Upstream commit 6dd3b8c9f5 ]

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: a8d11cd071 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-05-14 09:50:24 +02:00

..

common.h

…

core.c

x86/kprobes: Fix to check non boostable prefixes correctly

2021-05-14 09:50:24 +02:00

ftrace.c

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Makefile

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opt.c

x86/kprobes: Fix optprobe to detect INT3 padding correctly

2020-12-12 15:25:17 +01:00