This is a note to let you know that I've just added the patch titled
Revert "bpf, sockmap: Prevent lock inversion deadlock in map delete elem"
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-bpf-sockmap-prevent-lock-inversion-deadlock-i.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit adcf1ec1c6c92860ec9544fd2375fa0840b03d69
Author: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Date: Mon May 27 13:20:08 2024 +0200
Revert "bpf, sockmap: Prevent lock inversion deadlock in map delete elem"
[ Upstream commit 3b9ce0491a43e9af7f108b2f1bced7cd35931660 ]
This reverts commit ff91059932401894e6c86341915615c5eb0eca48.
This check is no longer needed. BPF programs attached to tracepoints are
now rejected by the verifier when they attempt to delete from a
sockmap/sockhash maps.
Signed-off-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240527-sockmap-verify-deletes-v1-2-944b372f2101@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 01be07b485fad..a37143d181f95 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -411,9 +411,6 @@ static int __sock_map_delete(struct bpf_stab *stab, struct sock *sk_test,
struct sock *sk;
int err = 0;
- if (irqs_disabled())
- return -EOPNOTSUPP; /* locks here are hardirq-unsafe */
-
spin_lock_bh(&stab->lock);
sk = *psk;
if (!sk_test || sk_test == sk)
@@ -936,9 +933,6 @@ static long sock_hash_delete_elem(struct bpf_map *map, void *key)
struct bpf_shtab_elem *elem;
int ret = -ENOENT;
- if (irqs_disabled())
- return -EOPNOTSUPP; /* locks here are hardirq-unsafe */
-
hash = sock_hash_bucket_hash(key, key_size);
bucket = sock_hash_select_bucket(htab, hash);
