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| author | Eric Dumazet <edumazet@google.com> | 2021-04-14 12:36:44 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 09:50:38 +0200 |
| commit | 2b3ae007c6394446562f9ba2e5043fb209ab3fb0 (patch) | |
| tree | 307bebfbfb48ead0646837e9d2a8e2b73950ac24 /net/packet/internal.h | |
| parent | 3a1c395703bef879cc13b4b02530db72d2c3aeb6 (diff) | |
| download | kernel_replicant_linux-2b3ae007c6394446562f9ba2e5043fb209ab3fb0.tar.gz kernel_replicant_linux-2b3ae007c6394446562f9ba2e5043fb209ab3fb0.tar.bz2 kernel_replicant_linux-2b3ae007c6394446562f9ba2e5043fb209ab3fb0.zip | |
net/packet: remove data races in fanout operations
[ Upstream commit 94f633ea8ade8418634d152ad0931133338226f6 ]
af_packet fanout uses RCU rules to ensure f->arr elements
are not dismantled before RCU grace period.
However, it lacks rcu accessors to make sure KCSAN and other tools
wont detect data races. Stupid compilers could also play games.
Fixes: dc99f600698d ("packet: Add fanout support.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: "Gong, Sishuai" <sishuai@purdue.edu>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/packet/internal.h')
| -rw-r--r-- | net/packet/internal.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/packet/internal.h b/net/packet/internal.h index baafc3f3fa25..7af1e9179385 100644 --- a/net/packet/internal.h +++ b/net/packet/internal.h @@ -94,7 +94,7 @@ struct packet_fanout { spinlock_t lock; refcount_t sk_ref; struct packet_type prot_hook ____cacheline_aligned_in_smp; - struct sock *arr[]; + struct sock __rcu *arr[]; }; struct packet_rollover { |