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Message-ID: <tip-8101376dc5f42bd93b36d4ab210b44503d0ec11f@git.kernel.org>
Date: Wed, 10 Apr 2013 02:22:53 -0700
From: tip-bot for Masami Hiramatsu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, fche@...hat.com, hpa@...or.com,
mingo@...nel.org, masami.hiramatsu.pt@...achi.com,
rostedt@...dmis.org, tglx@...utronix.de
Subject: [tip:perf/core] kprobes/x86:
Just return error for sanity check failure instead of using BUG_ON
Commit-ID: 8101376dc5f42bd93b36d4ab210b44503d0ec11f
Gitweb: http://git.kernel.org/tip/8101376dc5f42bd93b36d4ab210b44503d0ec11f
Author: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 4 Apr 2013 19:42:30 +0900
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 8 Apr 2013 17:28:34 +0200
kprobes/x86: Just return error for sanity check failure instead of using BUG_ON
Return an error from __copy_instruction() and use printk() to
give us a more productive message, since this is just an error
case which we can handle and also the BUG_ON() never tells us
why and what happened.
This is related to the following bug-report:
https://bugzilla.redhat.com/show_bug.cgi?id=910649
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Frank Ch. Eigler <fche@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: yrl.pp-manager.tt@...achi.com
Link: http://lkml.kernel.org/r/20130404104230.22862.85242.stgit@mhiramat-M0-7522
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/x86/kernel/kprobes/core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 7bfe318..9895a9a 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -353,7 +353,11 @@ int __kprobes __copy_instruction(u8 *dest, u8 *src)
* have given.
*/
newdisp = (u8 *) src + (s64) insn.displacement.value - (u8 *) dest;
- BUG_ON((s64) (s32) newdisp != newdisp); /* Sanity check. */
+ if ((s64) (s32) newdisp != newdisp) {
+ pr_err("Kprobes error: new displacement does not fit into s32 (%llx)\n", newdisp);
+ pr_err("\tSrc: %p, Dest: %p, old disp: %x\n", src, dest, insn.displacement.value);
+ return 0;
+ }
disp = (u8 *) dest + insn_offset_displacement(&insn);
*(s32 *) disp = (s32) newdisp;
}
--
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