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Date: Mon, 01 Jul 2024 15:06:18 -0700 From: syzbot <syzbot+c1e04a422bbc0f0f2921@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, eddyz87@...il.com, haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org, sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] [net?] stack segment fault in dev_hash_map_redirect Hello, syzbot found the following issue on: HEAD commit: 74564adfd352 Add linux-next specific files for 20240701 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=163a0f1e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=111e4e0e6fbde8f0 dashboard link: https://syzkaller.appspot.com/bug?extid=c1e04a422bbc0f0f2921 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/04b8d7db78fb/disk-74564adf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d996f4370003/vmlinux-74564adf.xz kernel image: https://storage.googleapis.com/syzbot-assets/6e7e630054e7/bzImage-74564adf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c1e04a422bbc0f0f2921@...kaller.appspotmail.com Oops: stack segment: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 12368 Comm: syz.0.2084 Not tainted 6.10.0-rc6-next-20240701-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline] RIP: 0010:__bpf_xdp_redirect_map include/linux/filter.h:1672 [inline] RIP: 0010:dev_hash_map_redirect+0x64/0x620 kernel/bpf/devmap.c:1027 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 0f 9c 3d 00 48 8b 03 48 89 44 24 08 48 8d 58 38 48 89 dd 48 c1 ed 03 <42> 0f b6 44 3d 00 84 c0 0f 85 f5 03 00 00 44 8b 33 44 89 f6 83 e6 RSP: 0018:ffffc900108f7958 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000038 RCX: 0000000000040000 RDX: ffffc90009834000 RSI: 00000000000001b9 RDI: 00000000000001ba RBP: 0000000000000007 R08: 0000000000000007 R09: ffffffff81b5e80f R10: 0000000000000004 R11: ffff888068e5da00 R12: 0000000000000008 R13: 00000000108f79b0 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fb7f29dc6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000078d4a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_prog_ec9efaa32d58ce69+0x56/0x5a __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run_xdp include/net/xdp.h:514 [inline] tun_build_skb drivers/net/tun.c:1711 [inline] tun_get_user+0x3321/0x4560 drivers/net/tun.c:1819 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb7f1b7471f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48 RSP: 002b:00007fb7f29dc010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb7f1d03fa0 RCX: 00007fb7f1b7471f RDX: 000000000000003a RSI: 0000000020000000 RDI: 00000000000000c8 RBP: 00007fb7f1bf677e R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000003a R11: 0000000000000293 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb7f1d03fa0 R15: 00007ffc3bd4c628 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline] RIP: 0010:__bpf_xdp_redirect_map include/linux/filter.h:1672 [inline] RIP: 0010:dev_hash_map_redirect+0x64/0x620 kernel/bpf/devmap.c:1027 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 0f 9c 3d 00 48 8b 03 48 89 44 24 08 48 8d 58 38 48 89 dd 48 c1 ed 03 <42> 0f b6 44 3d 00 84 c0 0f 85 f5 03 00 00 44 8b 33 44 89 f6 83 e6 RSP: 0018:ffffc900108f7958 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000038 RCX: 0000000000040000 RDX: ffffc90009834000 RSI: 00000000000001b9 RDI: 00000000000001ba RBP: 0000000000000007 R08: 0000000000000007 R09: ffffffff81b5e80f R10: 0000000000000004 R11: ffff888068e5da00 R12: 0000000000000008 R13: 00000000108f79b0 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fb7f29dc6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000078d4a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c call 0x3c80420e b: 38 00 cmp %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 0f 9c 3d 00 call 0x3d9c26 17: 48 8b 03 mov (%rbx),%rax 1a: 48 89 44 24 08 mov %rax,0x8(%rsp) 1f: 48 8d 58 38 lea 0x38(%rax),%rbx 23: 48 89 dd mov %rbx,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 0f b6 44 3d 00 movzbl 0x0(%rbp,%r15,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 0f 85 f5 03 00 00 jne 0x42d 38: 44 8b 33 mov (%rbx),%r14d 3b: 44 89 f6 mov %r14d,%esi 3e: 83 .byte 0x83 3f: e6 .byte 0xe6 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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