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kprobes: Prohibit to probe native_get_debugreg

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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>
This commit is contained in:
Masami Hiramatsu 2009-08-27 13:23:32 -04:00 committed by Frederic Weisbecker
parent 8222d718b3
commit 65e234ec2c
1 changed files with 1 additions and 0 deletions
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kernel/kprobes.c
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@ -90,6 +90,7 @@ static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
*/ */
static struct kprobe_blackpoint kprobe_blacklist[] = { static struct kprobe_blackpoint kprobe_blacklist[] = {
{"preempt_schedule",}, {"preempt_schedule",},
{"native_get_debugreg",},
{NULL} /* Terminator */ {NULL} /* Terminator */
}; };