linux/net/bpfilter
Alexei Starovoitov 66e58e0ef8 bpfilter: fix race in pipe access
syzbot reported the following crash
[  338.293946] bpfilter: read fail -512
[  338.304515] kasan: GPF could be caused by NULL-ptr deref or user memory access
[  338.311863] general protection fault: 0000 [#1] SMP KASAN
[  338.344360] RIP: 0010:__vfs_write+0x4a6/0x960
[  338.426363] Call Trace:
[  338.456967]  __kernel_write+0x10c/0x380
[  338.460928]  __bpfilter_process_sockopt+0x1d8/0x35b
[  338.487103]  bpfilter_mbox_request+0x4d/0xb0
[  338.491492]  bpfilter_ip_get_sockopt+0x6b/0x90

This can happen when multiple cpus trying to talk to user mode process
via bpfilter_mbox_request(). One cpu grabs the mutex while another goes to
sleep on the same mutex. Then former cpu sees that umh pipe is down and
shuts down the pipes. Later cpu finally acquires the mutex and crashes
on freed pipe.
Fix the race by using info.pid as an indicator that umh and pipes are healthy
and check it after acquiring the mutex.

Fixes: d2ba09c17a ("net: add skeleton of bpfilter kernel module")
Reported-by: syzbot+7ade6c94abb2774c0fee@syzkaller.appspotmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-07 20:07:28 -04:00
..
bpfilter_kern.c bpfilter: fix race in pipe access 2018-06-07 20:07:28 -04:00
Kconfig bpfilter: fix build dependency 2018-05-24 09:33:28 -04:00
main.c bpfilter: don't pass O_CREAT when opening console for debug 2018-05-24 09:36:49 -04:00
Makefile bpfilter: fix OUTPUT_FORMAT 2018-06-07 16:56:48 -04:00
msgfmt.h