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| author | Eric W. Biederman <ebiederm@xmission.com> | 2019-05-15 12:23:03 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2019-05-27 09:36:28 -0500 |
| commit | 1dfd1711de2952fd1bfeea7152bd1687a4eea771 (patch) | |
| tree | 538d0563415e622d7ed2de7c3333ff9c929b8972 /net | |
| parent | fee109901f392a96189bd84a41845535a52bd94d (diff) | |
| download | linux-1dfd1711de2952fd1bfeea7152bd1687a4eea771.tar.bz2 | |
signal/bpfilter: Fix bpfilter_kernl to use send_sig not force_sig
The locking in force_sig_info is not prepared to deal with
a task that exits or execs (as sighand may change). As force_sig
is only built to handle synchronous exceptions.
Further the function force_sig_info changes the signal state if the
signal is ignored, or blocked or if SIGNAL_UNKILLABLE will prevent the
delivery of the signal. The signal SIGKILL can not be ignored and can
not be blocked and SIGNAL_UNKILLABLE won't prevent it from being
delivered.
So using force_sig rather than send_sig for SIGKILL is pointless.
Because it won't impact the sending of the signal and and because
using force_sig is wrong, replace force_sig with send_sig.
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bpfilter/bpfilter_kern.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 7ee4fea93637..c0f0990f30b6 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -22,7 +22,7 @@ static void shutdown_umh(void) tsk = get_pid_task(find_vpid(bpfilter_ops.info.pid), PIDTYPE_PID); if (tsk) { - force_sig(SIGKILL, tsk); + send_sig(SIGKILL, tsk, 1); put_task_struct(tsk); } } |