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net/packet: convert po->auxdata to an atomic flag

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[ Upstream commit fd53c297aa7b077ae98a3d3d2d3aa278a1686ba6 ]

po->auxdata can be read while another thread
is changing its value, potentially raising KCSAN splat.

Convert it to PACKET_SOCK_AUXDATA flag.

Fixes: 8dc4194474 ("[PACKET]: Add optional checksum computation for recvmsg")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet
2023-03-16 01:10:08 +00:00
committed by Greg Kroah-Hartman
parent 5ca1be3658
commit 05c6db12ae
3 changed files with 6 additions and 8 deletions
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4
net/packet/internal.h
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@@ -118,8 +118,7 @@ struct packet_sock {
struct mutex pg_vec_lock;
unsigned long flags;
unsigned int running; /* bind_lock must be held */
unsigned int auxdata:1, /* writer must hold sock lock */
has_vnet_hdr:1,
unsigned int has_vnet_hdr:1, /* writer must hold sock lock */
tp_loss:1,
tp_tx_has_off:1;
int pressure;
@@ -146,6 +145,7 @@ static struct packet_sock *pkt_sk(struct sock *sk)
enum packet_sock_flags {
PACKET_SOCK_ORIGDEV,
PACKET_SOCK_AUXDATA,
};
static inline void packet_sock_flag_set(struct packet_sock *po,