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| author | Eric Dumazet <edumazet@google.com> | 2021-09-29 15:57:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-06 15:42:35 +0200 |
| commit | 0fcfaa8ed9d1dcbe377b202a1b3cdfd4e566114c (patch) | |
| tree | afde2152a06ae07ecf21a6afb310a2f210301c46 /include/net | |
| parent | 694b0cee7f8546b69a80996a29cb3cf4149c0453 (diff) | |
| download | linux-stable-0fcfaa8ed9d1dcbe377b202a1b3cdfd4e566114c.tar.gz linux-stable-0fcfaa8ed9d1dcbe377b202a1b3cdfd4e566114c.tar.bz2 linux-stable-0fcfaa8ed9d1dcbe377b202a1b3cdfd4e566114c.zip | |
af_unix: fix races in sk_peer_pid and sk_peer_cred accesses
[ Upstream commit 35306eb23814444bd4021f8a1c3047d3cb0c8b2b ]
Jann Horn reported that SO_PEERCRED and SO_PEERGROUPS implementations
are racy, as af_unix can concurrently change sk_peer_pid and sk_peer_cred.
In order to fix this issue, this patch adds a new spinlock that needs
to be used whenever these fields are read or written.
Jann also pointed out that l2cap_sock_get_peer_pid_cb() is currently
reading sk->sk_peer_pid which makes no sense, as this field
is only possibly set by AF_UNIX sockets.
We will have to clean this in a separate patch.
This could be done by reverting b48596d1dc25 "Bluetooth: L2CAP: Add get_peer_pid callback"
or implementing what was truly expected.
Fixes: 109f6e39fa07 ("af_unix: Allow SO_PEERCRED to work across namespaces.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jann Horn <jannh@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/sock.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index d3dd89b6e2cb..079b5f6f13d8 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -470,8 +470,10 @@ struct sock { u32 sk_ack_backlog; u32 sk_max_ack_backlog; kuid_t sk_uid; + spinlock_t sk_peer_lock; struct pid *sk_peer_pid; const struct cred *sk_peer_cred; + long sk_rcvtimeo; ktime_t sk_stamp; #if BITS_PER_LONG==32 |