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Date: Fri, 12 Dec 2014 06:14:25 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, "Ingo Molnar" <mingo@...nel.org>,
"Andy Lutomirski" <luto@...capital.net>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
"Steven Rostedt" <rostedt@...dmis.org>
Subject: [PATCH 3.2 153/164] x86/asm/traps: Disable tracing and kprobes in
fixup_bad_iret and sync_regs
3.2.65-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Andy Lutomirski <luto@...capital.net>
commit 7ddc6a2199f1da405a2fb68c40db8899b1a8cd87 upstream.
These functions can be executed on the int3 stack, so kprobes
are dangerous. Tracing is probably a bad idea, too.
Fixes: b645af2d5905 ("x86_64, traps: Rework bad_iret")
Signed-off-by: Andy Lutomirski <luto@...capital.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/50e33d26adca60816f3ba968875801652507d0c4.1416870125.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.2:
- Use __kprobes instead of NOKPROBE_SYMBOL()
- Don't use __visible]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
arch/x86/kernel/traps.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -344,7 +344,7 @@ dotraplinkage void __kprobes do_int3(str
* for scheduling or signal handling. The actual stack switch is done in
* entry.S
*/
-asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
+asmlinkage notrace __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
{
struct pt_regs *regs = eregs;
/* Did already sync */
@@ -369,7 +369,7 @@ struct bad_iret_stack {
struct pt_regs regs;
};
-asmlinkage
+asmlinkage notrace __kprobes
struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s)
{
/*
--
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