Masami Hiramatsu 070c57885e x86/kprobes: Restore BTF if the single-stepping is cancelled
[ Upstream commit 78ff2733ff352175eb7f4418a34654346e1b6cd2 ]

Fix to restore BTF if single-stepping causes a page fault and
it is cancelled.

Usually the BTF flag was restored when the single stepping is done
(in resume_execution()). However, if a page fault happens on the
single stepping instruction, the fault handler is invoked and
the single stepping is cancelled. Thus, the BTF flag is not
restored.

Fixes: 1ecc798c6764 ("x86: debugctlmsr kprobes")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/160389546985.106936.12727996109376240993.stgit@devnote2
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-12-30 11:51:22 +01:00
..
2020-05-10 10:31:31 +02:00
2020-11-05 11:43:33 +01:00
2019-09-27 13:02:19 -07:00
2020-11-05 11:43:14 +01:00