diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2012-07-30 14:40:26 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-10 00:25:01 +0100 |
| commit | 1b772a147a183c09462f0d23e041b077f158fa0f (patch) | |
| tree | e6e1b445066c1399894f14e1481db4865a49d115 /lib | |
| parent | ffb709e6aa95c3ba44fa8af9f7815e3c6cfed04e (diff) | |
lib/vsprintf.c: kptr_restrict: fix pK-error in SysRq show-all-timers(Q)
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@gmail.com>
Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vsprintf.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 993599e66e5a..d74c317f4b29 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -886,7 +886,8 @@ 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 = 2 * sizeof(void *); return string(buf, end, "pK-error", spec); |