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author | Eric W. Biederman <ebiederm@xmission.com> | 2018-01-05 17:27:42 -0600 |
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committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-01-12 14:21:07 -0600 |
commit | faf1f22b61f2715224ba9b579e2a983e99b86823 (patch) | |
tree | fb871c31027141a61c4e1d898d967df6baab025d /fs | |
parent | 8c5dbf2ae00bb8667f61c5edc6521c1fa2bbe4d7 (diff) | |
download | linux-faf1f22b61f2715224ba9b579e2a983e99b86823.tar.bz2 |
signal: Ensure generic siginfos the kernel sends have all bits initialized
Call clear_siginfo to ensure stack allocated siginfos are fully
initialized before being passed to the signal sending functions.
This ensures that if there is the kind of confusion documented by
TRAP_FIXME, FPE_FIXME, or BUS_FIXME the kernel won't send unitialized
data to userspace when the kernel generates a signal with SI_USER but
the copy to userspace assumes it is a different kind of signal, and
different fields are initialized.
This also prepares the way for turning copy_siginfo_to_user
into a copy_to_user, by removing the need in many cases to perform
a field by field copy simply to skip the uninitialized fields.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/fcntl.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c index 0522e283a4f4..c17369659f4a 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -737,6 +737,7 @@ static void send_sigio_to_task(struct task_struct *p, delivered even if we can't queue. Failure to queue in this case _should_ be reported; we fall back to SIGIO in that case. --sct */ + clear_siginfo(&si); si.si_signo = signum; si.si_errno = 0; si.si_code = reason; |