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kprobes: Verify jprobe entry point

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

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Namhyung Kim 2010-09-15 10:04:27 +09:00 • committed by Ingo Molnar
commit 05662bdb64
1 changed files with 9 additions and 5 deletions
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14
kernel/kprobes.c
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@ -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)