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Date: Fri, 05 Jul 2024 22:08:22 -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: Re: [syzbot] [bpf?] [net?] stack segment fault in dev_hash_map_redirect syzbot has found a reproducer for the following issue on: HEAD commit: 0b58e108042b Add linux-next specific files for 20240703 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=165ce371980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed034204f2e40e53 dashboard link: https://syzkaller.appspot.com/bug?extid=c1e04a422bbc0f0f2921 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=14987969980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11955485980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1d079762feae/disk-0b58e108.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e53996c8d8c2/vmlinux-0b58e108.xz kernel image: https://storage.googleapis.com/syzbot-assets/a0bf21cdd844/bzImage-0b58e108.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: 0 UID: 0 PID: 5094 Comm: syz-executor316 Not tainted 6.10.0-rc6-next-20240703-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:1699 [inline] RIP: 0010:dev_hash_map_redirect+0x64/0x620 kernel/bpf/devmap.c:1022 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 9f 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:ffffc9000356f958 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000038 RCX: ffff8880276e9e00 RDX: 0000000000000000 RSI: 000000000356f9b0 RDI: ffff88802f22f000 RBP: 0000000000000007 R08: 0000000000000007 R09: ffffffff81b5ee2f R10: 0000000000000004 R11: ffff8880276e9e00 R12: 0000000000000008 R13: 000000000356f9b0 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055557ccb9380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021d5ab98 CR3: 0000000022250000 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: 0033:0x7fbd788a7f10 Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d b1 e1 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89 RSP: 002b:00007ffde33a9838 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbd788a7f10 RDX: 000000000000004e RSI: 0000000020000540 RDI: 00000000000000c8 RBP: 0000000000000000 R08: 00007ffde33a9968 R09: 00007ffde33a9968 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </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:1699 [inline] RIP: 0010:dev_hash_map_redirect+0x64/0x620 kernel/bpf/devmap.c:1022 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 9f 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:ffffc9000356f958 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000038 RCX: ffff8880276e9e00 RDX: 0000000000000000 RSI: 000000000356f9b0 RDI: ffff88802f22f000 RBP: 0000000000000007 R08: 0000000000000007 R09: ffffffff81b5ee2f R10: 0000000000000004 R11: ffff8880276e9e00 R12: 0000000000000008 R13: 000000000356f9b0 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055557ccb9380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021d5ab98 CR3: 0000000022250000 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 9f 9c 3d 00 call 0x3d9cb6 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 --- 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.
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