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| author | Vlad Tsyrklevich <vlad@tsyrklevich.net> | 2016-10-11 15:02:47 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-13 10:20:06 -0400 |
| commit | 02a9079c66341836c4914c33c06a73245060df2e (patch) | |
| tree | 55954839f7713011d9681f7626cfb5471d0a1d15 /drivers/ptp | |
| parent | b8a4ddb2e8f44f872fb93bbda2d541b27079fd2b (diff) | |
| download | linux-02a9079c66341836c4914c33c06a73245060df2e.tar.gz linux-02a9079c66341836c4914c33c06a73245060df2e.tar.bz2 linux-02a9079c66341836c4914c33c06a73245060df2e.zip | |
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/ptp')
| -rw-r--r-- | drivers/ptp/ptp_chardev.c | 1 |
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; |