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authorKuniyuki Iwashima <kuniyu@amazon.com>2023-05-24 16:29:34 -0700
committerJakub Kicinski <kuba@kernel.org>2023-05-25 21:03:23 -0700
commit822b5a1c17df7e338b9f05d1cfe5764e37c7f74f (patch)
treeee9511f808bd9dd20dab29cc0018b6a9a3b3ce4c /net/packet
parent081e8df6819997eae236f75dd52f0c147c4be939 (diff)
af_packet: Fix data-races of pkt_sk(sk)->num.
syzkaller found a data race of pkt_sk(sk)->num. The value is changed under lock_sock() and po->bind_lock, so we need READ_ONCE() to access pkt_sk(sk)->num without these locks in packet_bind_spkt(), packet_bind(), and sk_diag_fill(). Note that WRITE_ONCE() is already added by commit c7d2ef5dd4b0 ("net/packet: annotate accesses to po->bind"). BUG: KCSAN: data-race in packet_bind / packet_do_bind write (marked) to 0xffff88802ffd1cee of 2 bytes by task 7322 on cpu 0: packet_do_bind+0x446/0x640 net/packet/af_packet.c:3236 packet_bind+0x99/0xe0 net/packet/af_packet.c:3321 __sys_bind+0x19b/0x1e0 net/socket.c:1803 __do_sys_bind net/socket.c:1814 [inline] __se_sys_bind net/socket.c:1812 [inline] __x64_sys_bind+0x40/0x50 net/socket.c:1812 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x72/0xdc read to 0xffff88802ffd1cee of 2 bytes by task 7318 on cpu 1: packet_bind+0xbf/0xe0 net/packet/af_packet.c:3322 __sys_bind+0x19b/0x1e0 net/socket.c:1803 __do_sys_bind net/socket.c:1814 [inline] __se_sys_bind net/socket.c:1812 [inline] __x64_sys_bind+0x40/0x50 net/socket.c:1812 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x72/0xdc value changed: 0x0300 -> 0x0000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7318 Comm: syz-executor.4 Not tainted 6.3.0-13380-g7fddb5b5300c #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Fixes: 96ec6327144e ("packet: Diag core and basic socket info dumping") Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzkaller <syzkaller@googlegroups.com> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20230524232934.50950-1-kuniyu@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c4
-rw-r--r--net/packet/diag.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 94c6a1ffa459..a1f9a0e9f3c8 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3299,7 +3299,7 @@ static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data_min));
name[sizeof(uaddr->sa_data_min)] = 0;
- return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
+ return packet_do_bind(sk, name, 0, READ_ONCE(pkt_sk(sk)->num));
}
static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
@@ -3317,7 +3317,7 @@ static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len
return -EINVAL;
return packet_do_bind(sk, NULL, sll->sll_ifindex,
- sll->sll_protocol ? : pkt_sk(sk)->num);
+ sll->sll_protocol ? : READ_ONCE(pkt_sk(sk)->num));
}
static struct proto packet_proto = {
diff --git a/net/packet/diag.c b/net/packet/diag.c
index d0c4eda4cdc6..f6b200cb3c06 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -143,7 +143,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
rp = nlmsg_data(nlh);
rp->pdiag_family = AF_PACKET;
rp->pdiag_type = sk->sk_type;
- rp->pdiag_num = ntohs(po->num);
+ rp->pdiag_num = ntohs(READ_ONCE(po->num));
rp->pdiag_ino = sk_ino;
sock_diag_save_cookie(sk, rp->pdiag_cookie);