https://github.com/torvalds/linux
Revision 63dc6325ff41ee9e570bde705ac34a39c5dbeb44 authored by Masami Hiramatsu (Google) on 19 December 2022, 14:35:19 UTC, committed by Peter Zijlstra on 27 December 2022, 11:51:58 UTC
Since the CONFIG_RETHUNK and CONFIG_SLS will use INT3 for stopping
speculative execution after function return, kprobe jump optimization
always fails on the functions with such INT3 inside the function body.
(It already checks the INT3 padding between functions, but not inside
 the function)

To avoid this issue, as same as kprobes, check whether the INT3 comes
from kgdb or not, and if so, stop decoding and make it fail. The other
INT3 will come from CONFIG_RETHUNK/CONFIG_SLS and those can be
treated as a one-byte instruction.

Fixes: e463a09af2f0 ("x86: Add straight-line-speculation mitigation")
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/167146051929.1374301.7419382929328081706.stgit@devnote3
1 parent 1993bf9
History
Tip revision: 63dc6325ff41ee9e570bde705ac34a39c5dbeb44 authored by Masami Hiramatsu (Google) on 19 December 2022, 14:35:19 UTC
x86/kprobes: Fix optprobe optimization check with CONFIG_RETHUNK
Tip revision: 63dc632
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