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authorTakashi Iwai <tiwai@suse.de>2019-02-14 11:59:09 +0100
committerTakashi Iwai <tiwai@suse.de>2019-02-14 11:59:09 +0100
commit545ad0bf840ff650bf897b1e076d6ef71615d508 (patch)
treea350e382458eee15314ccb1d9740425991a1da64
parent18d57dce8933314e903d0dcb98dd02db98145e7e (diff)
kprobes: Return error if we fail to reuse kprobe instead of
BUG_ON() (bsc#1051510). suse-commit: a34e8dd3dfcf216bf5da1cd83a3912d7ef608437
-rw-r--r--kernel/kprobes.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 4a2dd5fcee5d..43203dadefd3 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -697,9 +697,10 @@ static void unoptimize_kprobe(struct kprobe *p, bool force)
}
/* Cancel unoptimizing for reusing */
-static void reuse_unused_kprobe(struct kprobe *ap)
+static int reuse_unused_kprobe(struct kprobe *ap)
{
struct optimized_kprobe *op;
+ int ret;
BUG_ON(!kprobe_unused(ap));
/*
@@ -713,8 +714,12 @@ static void reuse_unused_kprobe(struct kprobe *ap)
/* Enable the probe again */
ap->flags &= ~KPROBE_FLAG_DISABLED;
/* Optimize it again (remove from op->list) */
- BUG_ON(!kprobe_optready(ap));
+ ret = kprobe_optready(ap);
+ if (ret)
+ return ret;
+
optimize_kprobe(ap);
+ return 0;
}
/* Remove optimized instructions */
@@ -933,11 +938,16 @@ static void __disarm_kprobe(struct kprobe *p, bool reopt)
#define kprobe_disarmed(p) kprobe_disabled(p)
#define wait_for_kprobe_optimizer() do {} while (0)
-/* There should be no unused kprobes can be reused without optimization */
-static void reuse_unused_kprobe(struct kprobe *ap)
+static int reuse_unused_kprobe(struct kprobe *ap)
{
+ /*
+ * If the optimized kprobe is NOT supported, the aggr kprobe is
+ * released at the same time that the last aggregated kprobe is
+ * unregistered.
+ * Thus there should be no chance to reuse unused kprobe.
+ */
printk(KERN_ERR "Error: There should be no unused kprobe here.\n");
- BUG_ON(kprobe_unused(ap));
+ return -EINVAL;
}
static void free_aggr_kprobe(struct kprobe *p)
@@ -1315,9 +1325,12 @@ static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p)
goto out;
}
init_aggr_kprobe(ap, orig_p);
- } else if (kprobe_unused(ap))
+ } else if (kprobe_unused(ap)) {
/* This probe is going to die. Rescue it */
- reuse_unused_kprobe(ap);
+ ret = reuse_unused_kprobe(ap);
+ if (ret)
+ goto out;
+ }
if (kprobe_gone(ap)) {
/*