This is a note to let you know that I've just added the patch titled
lib/vsprintf.c: kptr_restrict: fix pK-error in SysRq show-all-timers(Q)
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
lib-vsprintf.c-kptr_restrict-fix-pk-error-in-sysrq-show-all-timers-q.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b772a147a183c09462f0d23e041b077f158fa0f Mon Sep 17 00:00:00 2001
From: Dan Rosenberg <drosenberg@xxxxxxxxxxxxx>
Date: Mon, 30 Jul 2012 14:40:26 -0700
Subject: lib/vsprintf.c: kptr_restrict: fix pK-error in SysRq show-all-timers(Q)
From: Dan Rosenberg <drosenberg@xxxxxxxxxxxxx>
commit 3715c5309f6d175c3053672b73fd4f73be16fd07 upstream.
When using ALT+SysRq+Q all the pointers are replaced with "pK-error" like
this:
[23153.208033] .base: pK-error
with echo h > /proc/sysrq-trigger it works:
[23107.776363] .base: ffff88023e60d540
The intent behind this behavior was to return "pK-error" in cases where
the %pK format specifier was used in interrupt context, because the
CAP_SYSLOG check wouldn't be meaningful. Clearly this should only apply
when kptr_restrict is actually enabled though.
Reported-by: Stevie Trujillo <stevie.trujillo@xxxxxxxxx>
Signed-off-by: Dan Rosenberg <dan.j.rosenberg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/vsprintf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -926,7 +926,8 @@ char *pointer(const char *fmt, char *buf
* %pK cannot be used in IRQ context because its test
* for CAP_SYSLOG would be meaningless.
*/
- if (in_irq() || in_serving_softirq() || in_nmi()) {
+ if (kptr_restrict && (in_irq() || in_serving_softirq() ||
+ in_nmi())) {
if (spec.field_width == -1)
spec.field_width = 2 * sizeof(void *);
return string(buf, end, "pK-error", spec);
Patches currently in stable-queue which might be from drosenberg@xxxxxxxxxxxxx are
queue-3.4/lib-vsprintf.c-kptr_restrict-fix-pk-error-in-sysrq-show-all-timers-q.patch
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