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Subject[tip:perf/core] kprobes: Verify jprobe entry point
Commit-ID:  05662bdb64c746079de7ac4dc4fb4caa5e8e119f
Gitweb: http://git.kernel.org/tip/05662bdb64c746079de7ac4dc4fb4caa5e8e119f
Author: Namhyung Kim <namhyung@gmail.com>
AuthorDate: Wed, 15 Sep 2010 10:04:27 +0900
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 15 Sep 2010 10:44:01 +0200

kprobes: Verify jprobe entry point

Verify jprobe's entry point is a function entry point
using kallsyms' offset value.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
LKML-Reference: <1284512670-2369-3-git-send-email-namhyung@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/kprobes.c | 14 +++++++++-----
1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 8f96701..1b0dbe0 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1339,14 +1339,18 @@ int __kprobes register_jprobes(struct jprobe **jps, int num)
if (num <= 0)
return -EINVAL;
for (i = 0; i < num; i++) {
- unsigned long addr;
+ unsigned long addr, offset;
jp = jps[i];
addr = arch_deref_entry_point(jp->entry);

- /* Todo: Verify probepoint is a function entry point */
- jp->kp.pre_handler = setjmp_pre_handler;
- jp->kp.break_handler = longjmp_break_handler;
- ret = register_kprobe(&jp->kp);
+ /* Verify probepoint is a function entry point */
+ if (kallsyms_lookup_size_offset(addr, NULL, &offset) &&
+ offset == 0) {
+ jp->kp.pre_handler = setjmp_pre_handler;
+ jp->kp.break_handler = longjmp_break_handler;
+ ret = register_kprobe(&jp->kp);
+ } else
+ ret = -EINVAL;

if (ret < 0) {
if (i > 0)

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