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authorKeshavamurthy Anil S <anil.s.keshavamurthy@intel.com>2005-12-12 00:37:34 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 08:57:45 -0800
commitbf8d5c52c3b6b27061e3b7d779057fd9a6cac164 (patch)
treee4371185eba27db47282410dd490b78598d20636 /kernel/kprobes.c
parent00d7c05ab168c10f9b520e07400923267bc04419 (diff)
downloadop-kernel-dev-bf8d5c52c3b6b27061e3b7d779057fd9a6cac164.zip
op-kernel-dev-bf8d5c52c3b6b27061e3b7d779057fd9a6cac164.tar.gz
[PATCH] kprobes: increment kprobe missed count for multiprobes
When multiple probes are registered at the same address and if due to some recursion (probe getting triggered within a probe handler), we skip calling pre_handlers and just increment nmissed field. The below patch make sure it walks the list for multiple probes case. Without the below patch we get incorrect results of nmissed count for multiple probe case. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index e4f0fc62..3bb71e6 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -246,6 +246,19 @@ static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
return ret;
}
+/* Walks the list and increments nmissed count for multiprobe case */
+void __kprobes kprobes_inc_nmissed_count(struct kprobe *p)
+{
+ struct kprobe *kp;
+ if (p->pre_handler != aggr_pre_handler) {
+ p->nmissed++;
+ } else {
+ list_for_each_entry_rcu(kp, &p->list, list)
+ kp->nmissed++;
+ }
+ return;
+}
+
/* Called with kretprobe_lock held */
struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)
{
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