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| author | Eric W. Biederman <ebiederm@xmission.com> | 2017-07-24 21:53:03 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-01-12 21:34:45 +0100 |
| commit | 9943d3accb4ec5a85e72c65a9959257fa7d12500 (patch) | |
| tree | d5de2c756cebab39175066202c56eda0b3b8deb8 | |
| parent | signal: Ensure no siginfo union member increases the size of struct siginfo (diff) | |
| download | linux-9943d3accb4ec5a85e72c65a9959257fa7d12500.tar.xz linux-9943d3accb4ec5a85e72c65a9959257fa7d12500.zip | |
signal: Clear si_sys_private before copying siginfo to userspace
In preparation for unconditionally copying the whole of siginfo
to userspace clear si_sys_private. So this kernel internal
value is guaranteed not to make it to userspace.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | kernel/signal.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index b9e5d825ee46..18aa55c1bb4f 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -643,6 +643,9 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) spin_unlock(&tsk->sighand->siglock); posixtimer_rearm(info); spin_lock(&tsk->sighand->siglock); + + /* Don't expose the si_sys_private value to userspace */ + info->si_sys_private = 0; } #endif return signr; |