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authorNamhyung Kim <namhyung@gmail.com>2010-09-15 10:04:27 +0900
committerIngo Molnar <mingo@elte.hu>2010-09-15 10:44:01 +0200
commit05662bdb64c746079de7ac4dc4fb4caa5e8e119f (patch)
tree135bb59f626099718f6a325ae1c6a1155015b79e /kernel/kprobes.c
parentedbaadbe42b0b790618ec49d29626223529d8195 (diff)
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>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 8f967016cef..1b0dbe06707 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)