syzbot has found a reproducer for the following issue on: HEAD commit: 577e4432f3ac tcp: add sanity checks to rx zerocopy git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=149a6fe0180000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e23375d0c3afdc8 dashboard link: https://syzkaller.appspot.com/bug?extid=fd7b34375c1c8ce29c93 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e2ddf4180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c5d592180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d512cc35258d/disk-577e4432.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/83484fcd4968/vmlinux-577e4432.xz kernel image: https://storage.googleapis.com/syzbot-assets/dc2452784eec/bzImage-577e4432.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fd7b34375c1c8ce29c93@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 8000000023d8f067 P4D 8000000023d8f067 PUD 7af79067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN PTI CPU: 1 PID: 5255 Comm: syz-executor278 Not tainted 6.8.0-rc1-syzkaller-00195-g577e4432f3ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc9000437f8c8 EFLAGS: 00010246 RAX: 1ffff1100482de5c RBX: ffff88802416f2e0 RCX: ffff888023a7bb80 RDX: 0000000000000000 RSI: ffff88802416f000 RDI: ffff888023a96800 RBP: ffffc9000437fad0 R08: ffffffff8957112c R09: 1ffffffff2590c84 R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000004 R14: ffffffff89570ff9 R15: ffff888023a96800 FS: 00007f8dfb0eb6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000023dae000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> sk_psock_verdict_data_ready+0x232/0x340 net/core/skmsg.c:1230 unix_stream_sendmsg+0x9b4/0x1230 net/unix/af_unix.c:2293 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f8dfb16c729 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8dfb0eb218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8dfb1f6368 RCX: 00007f8dfb16c729 RDX: 0000000000040000 RSI: 0000000020000980 RDI: 0000000000000003 RBP: 00007f8dfb1f6360 R08: 00007fff2e940fc7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8dfb1f636c R13: 00007f8dfb1c3074 R14: 656c6c616b7a7973 R15: 00007fff2e940fc8 </TASK> Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc9000437f8c8 EFLAGS: 00010246 RAX: 1ffff1100482de5c RBX: ffff88802416f2e0 RCX: ffff888023a7bb80 RDX: 0000000000000000 RSI: ffff88802416f000 RDI: ffff888023a96800 RBP: ffffc9000437fad0 R08: ffffffff8957112c R09: 1ffffffff2590c84 R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000004 R14: ffffffff89570ff9 R15: ffff888023a96800 FS: 00007f8dfb0eb6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000023dae000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
