Messages in this thread Patch in this message |  | | | Date | Sat, 17 Oct 2009 09:57:58 GMT | | From | tip-bot for Masami Hiramatsu <> | | Subject | [tip:perf/probes] kprobes: Prohibit to probe native_get_debugreg |
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Commit-ID: 65e234ec2c4a0659ca22531dc1372a185f088517 Gitweb: http://git.kernel.org/tip/65e234ec2c4a0659ca22531dc1372a185f088517 Author: Masami Hiramatsu <mhiramat@redhat.com> AuthorDate: Thu, 27 Aug 2009 13:23:32 -0400 Committer: Frederic Weisbecker <fweisbec@gmail.com> CommitDate: Sun, 30 Aug 2009 03:15:55 +0200
kprobes: Prohibit to probe native_get_debugreg
Since do_debug() calls get_debugreg(), native_get_debugreg() will be called from singlestepping. This can cause an int3 infinite loop.
We can't put it in the .text.kprobes section because it is inlined, then we blacklist its name.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> LKML-Reference: <20090827172332.8246.34194.stgit@localhost.localdomain> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> --- kernel/kprobes.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index f72e96c..3267d90 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -90,6 +90,7 @@ static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash) */ static struct kprobe_blackpoint kprobe_blacklist[] = { {"preempt_schedule",}, + {"native_get_debugreg",}, {NULL} /* Terminator */ };
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