x86/kprobes: Fix to identify indirect jmp and others using range case

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Fix can_boost() to identify indirect jmp and others using range case
correctly.

Since the condition in switch statement is opcode & 0xf0, it can not
evaluate to 0xff case. This should be under the 0xf0 case. However,
there is no reason to use the conbinations of the bit-masked condition
and lower bit checking.

Use range case to clean up the switch statement too.

Fixes: 6256e668b7 ("x86/kprobes: Use int3 instead of debug trap for single-step")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/161666692308.1120877.4675552834049546493.stgit@devnote2

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Masami Hiramatsu 2021-03-25 19:08:43 +09:00 • committed by Ingo Molnar

parent 6dd3b8c9f5

commit 2f706e0e5e

1 changed files with 20 additions and 24 deletions

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arch/x86/kernel/kprobes/core.c

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