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| author | David S. Miller <davem@davemloft.net> | 2023-09-04 11:06:16 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-04 11:06:16 +0100 |
| commit | 2861f09c11122127ac2fadc85c735844b7bb6d49 (patch) | |
| tree | 332b4a89cd819ad45d81d5465c093852942323af | |
| parent | 718e6b51298e0f254baca0d40ab52a00e004e014 (diff) | |
| parent | b192812905e4b134f7b7994b079eb647e9d2d37e (diff) | |
| download | linux-2861f09c11122127ac2fadc85c735844b7bb6d49.tar.gz | |
Merge branch 'af_unix-data-races'
Kuniyuki Iwashima says:
====================
af_unix: Fix four data-races.
While running syzkaller, KCSAN reported 3 data-races with
systemd-coredump using AF_UNIX sockets.
This series fixes the three and another one inspiered by
one of the reports.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/sock.c | 6 | ||||
| -rw-r--r-- | net/unix/af_unix.c | 2 | ||||
| -rw-r--r-- | net/unix/scm.c | 6 |
3 files changed, 7 insertions, 7 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index d3c7b53368d22..16584e2dd6481 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2747,9 +2747,9 @@ static long sock_wait_for_wmem(struct sock *sk, long timeo) prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) break; - if (sk->sk_shutdown & SEND_SHUTDOWN) + if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) break; - if (sk->sk_err) + if (READ_ONCE(sk->sk_err)) break; timeo = schedule_timeout(timeo); } @@ -2777,7 +2777,7 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, goto failure; err = -EPIPE; - if (sk->sk_shutdown & SEND_SHUTDOWN) + if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) goto failure; if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf)) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 86930a8ed012b..3e8a04a136688 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -680,7 +680,7 @@ static void unix_release_sock(struct sock *sk, int embrion) * What the above comment does talk about? --ANK(980817) */ - if (unix_tot_inflight) + if (READ_ONCE(unix_tot_inflight)) unix_gc(); /* Garbage collect fds */ } diff --git a/net/unix/scm.c b/net/unix/scm.c index e9dde7176c8a3..6ff628f2349f5 100644 --- a/net/unix/scm.c +++ b/net/unix/scm.c @@ -64,7 +64,7 @@ void unix_inflight(struct user_struct *user, struct file *fp) /* Paired with READ_ONCE() in wait_for_unix_gc() */ WRITE_ONCE(unix_tot_inflight, unix_tot_inflight + 1); } - user->unix_inflight++; + WRITE_ONCE(user->unix_inflight, user->unix_inflight + 1); spin_unlock(&unix_gc_lock); } @@ -85,7 +85,7 @@ void unix_notinflight(struct user_struct *user, struct file *fp) /* Paired with READ_ONCE() in wait_for_unix_gc() */ WRITE_ONCE(unix_tot_inflight, unix_tot_inflight - 1); } - user->unix_inflight--; + WRITE_ONCE(user->unix_inflight, user->unix_inflight - 1); spin_unlock(&unix_gc_lock); } @@ -99,7 +99,7 @@ static inline bool too_many_unix_fds(struct task_struct *p) { struct user_struct *user = current_user(); - if (unlikely(user->unix_inflight > task_rlimit(p, RLIMIT_NOFILE))) + if (unlikely(READ_ONCE(user->unix_inflight) > task_rlimit(p, RLIMIT_NOFILE))) return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN); return false; } |