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authorVasiliy Kulikov <segooon@gmail.com>2010-10-27 15:34:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:14 -0700
commitb9b1134260e036fb75c468514569864dd6722f3e (patch)
tree1b93c6c85e6ed6aaf582f91ed9827586de002730 /drivers/char/ppdev.c
parent19714a8af8fe8618a9beace1f7a3bb10d55d5e2f (diff)
drivers/char/ppdev.c: fix information leak to userland
Structure par_timeout is copied to userland with some padding fields unitialized. Field tv_usec has type __kernel_suseconds_t, it differs from tv_sec's type on some architectures. It leads to leaking of stack memory. Signed-off-by: Vasiliy Kulikov <segooon@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/ppdev.c')
-rw-r--r--drivers/char/ppdev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 723152d978a9..f176dbaeb15a 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -613,6 +613,7 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case PPGETTIME:
to_jiffies = pp->pdev->timeout;
+ memset(&par_timeout, 0, sizeof(par_timeout));
par_timeout.tv_sec = to_jiffies / HZ;
par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))