CVE-2024-57902

In the Linux kernel, the following vulnerability has been resolved:

af_packet: fix vlan_get_tci() vs MSG_PEEK

Blamed commit forgot MSG_PEEK case, allowing a crash [1] as found

by syzbot.

Rework vlan_get_tci() to not touch skb at all,

so that it can be used from many cpus on the same skb.

Add a const qualifier to skb argument.

[1]

skbuff: skb_under_panic: text:ffffffff8a8da482 len:32 put:14 head:ffff88807a1d5800 data:ffff88807a1d5810 tail:0x14 end:0x140 dev:<NULL>

------------[ cut here ]------------

kernel BUG at net/core/skbuff.c:206 !

Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI

CPU: 0 UID: 0 PID: 5880 Comm: syz-executor172 Not tainted 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]

RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216

Code: 0b 8d 48 c7 c6 9e 6c 26 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 3a 5a 79 f7 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3

RSP: 0018:ffffc90003baf5b8 EFLAGS: 00010286

RAX: 0000000000000087 RBX: dffffc0000000000 RCX: 8565c1eec37aa000

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: ffff88802616fb50 R08: ffffffff817f0a4c R09: 1ffff92000775e50

R10: dffffc0000000000 R11: fffff52000775e51 R12: 0000000000000140

R13: ffff88807a1d5800 R14: ffff88807a1d5810 R15: 0000000000000014

FS: 00007fa03261f6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007ffd65753000 CR3: 0000000031720000 CR4: 00000000003526f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

skb_push+0xe5/0x100 net/core/skbuff.c:2636

vlan_get_tci+0x272/0x550 net/packet/af_packet.c:565

packet_recvmsg+0x13c9/0x1ef0 net/packet/af_packet.c:3616

sock_recvmsg_nosec net/socket.c:1044 [inline]

sock_recvmsg+0x22f/0x280 net/socket.c:1066

____sys_recvmsg+0x1c6/0x480 net/socket.c:2814

___sys_recvmsg net/socket.c:2856 [inline]

do_recvmmsg+0x426/0xab0 net/socket.c:2951

__sys_recvmmsg net/socket.c:3025 [inline]

__do_sys_recvmmsg net/socket.c:3048 [inline]

__se_sys_recvmmsg net/socket.c:3041 [inline]

__x64_sys_recvmmsg+0x199/0x250 net/socket.c:3041

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83