lib/kasprintf.c: add sanity check to kvasprintf
authorRasmus Villemoes <linux@rasmusvillemoes.dk>
Sat, 16 Jan 2016 00:58:47 +0000 (16:58 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 16 Jan 2016 19:17:27 +0000 (11:17 -0800)
commit8e2a2bfdb86ecb2421e3dd18d0fbbb42f2d943ad
tree5b5ed17a7234ad1bba7be081f533700de1a5736d
parent4d72ba014b4b0913f448ccaaaa2e8b39c54e3738
lib/kasprintf.c: add sanity check to kvasprintf

kasprintf relies on being able to replay the formatting and getting the
same result (in particular, the same length).  This will almost always
work, but it is possible that the object pointed to by a %s or %p
argument changed under us (so we might get truncated output).  Add a
somewhat paranoid sanity check and let's see if it ever triggers.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Joe Perches <joe@perches.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Maurizio Lombardi <mlombard@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/kasprintf.c