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authorDan Rosenberg <drosenberg@vsecurity.com>2012-07-30 14:40:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 17:25:14 -0700
commit3715c5309f6d175c3053672b73fd4f73be16fd07 (patch)
tree1edebc7992a0df311b4fffc5b5f58f206a0cc2fb /lib/vsprintf.c
parent80f548e04d0b1d67d4fa8f59dbecc247f7b71c92 (diff)
downloadlinux-3715c5309f6d175c3053672b73fd4f73be16fd07.tar.gz
lib/vsprintf.c: kptr_restrict: fix pK-error in SysRq show-all-timers(Q)
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@gmail.com> Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index a0b5f15c92c..225aa683e17 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1045,7 +1045,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
* %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 = default_width;
return string(buf, end, "pK-error", spec);