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authorVlad Tsyrklevich <vlad@tsyrklevich.net>2016-10-11 15:02:47 +0200
committerDavid S. Miller <davem@davemloft.net>2016-10-13 10:20:06 -0400
commit02a9079c66341836c4914c33c06a73245060df2e (patch)
tree55954839f7713011d9681f7626cfb5471d0a1d15 /drivers
parentb8a4ddb2e8f44f872fb93bbda2d541b27079fd2b (diff)
downloadlinux-02a9079c66341836c4914c33c06a73245060df2e.tar.bz2
drivers/ptp: Fix kernel memory disclosure
The reserved field precise_offset->rsv is not cleared before being copied to user space, leaking kernel stack memory. Clear the struct before it's copied. Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ptp/ptp_chardev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index d637c933c8a9..58a97d420572 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -193,6 +193,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
if (err)
break;
+ memset(&precise_offset, 0, sizeof(precise_offset));
ts = ktime_to_timespec64(xtstamp.device);
precise_offset.device.sec = ts.tv_sec;
precise_offset.device.nsec = ts.tv_nsec;