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Message-ID: <000000000000371fcb061a736a5b@google.com> Date: Sun, 09 Jun 2024 04:34:25 -0700 From: syzbot <syzbot+cca39e6e84a367a7e6f6@...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@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: Re: [syzbot] [bpf?] [net?] general protection fault in dev_map_enqueue (2) syzbot has found a reproducer for the following issue on: HEAD commit: c44711b78608 liquidio: Adjust a NULL pointer handling path.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=1175e6f6980000 kernel config: https://syzkaller.appspot.com/x/.config?x=333ebe38d43c42e2 dashboard link: https://syzkaller.appspot.com/bug?extid=cca39e6e84a367a7e6f6 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=172b3126980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17caa30a980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/47ff53e982e7/disk-c44711b7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7b10dcb52f35/vmlinux-c44711b7.xz kernel image: https://storage.googleapis.com/syzbot-assets/b4a6bf6f87c5/bzImage-c44711b7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cca39e6e84a367a7e6f6@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 5098 Comm: syz-executor784 Not tainted 6.10.0-rc2-syzkaller-00228-gc44711b78608 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:dev_map_enqueue+0x31/0x3e0 kernel/bpf/devmap.c:539 Code: 41 56 41 55 41 54 53 48 83 ec 18 49 89 d4 49 89 f5 48 89 fd 49 be 00 00 00 00 00 fc ff df e8 46 9c d7 ff 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 a0 5e 3d 00 4c 8b 7d 00 48 83 c5 RSP: 0018:ffffc9000343f678 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807eb31e00 RDX: 0000000000000000 RSI: ffff88802224a070 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff89625806 R09: ffffffff896257c3 R10: 0000000000000004 R11: ffff88807eb31e00 R12: ffff8880151d8000 R13: ffff88802224a070 R14: dffffc0000000000 R15: 0000000000000000 FS: 00005555867d5380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdc79c59303 CR3: 0000000022bc8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __xdp_do_redirect_frame net/core/filter.c:4397 [inline] xdp_do_redirect_frame+0x2a6/0x660 net/core/filter.c:4451 xdp_test_run_batch net/bpf/test_run.c:336 [inline] bpf_test_run_xdp_live+0xe60/0x1e60 net/bpf/test_run.c:384 bpf_prog_test_run_xdp+0x80e/0x11b0 net/bpf/test_run.c:1281 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4292 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5706 __do_sys_bpf kernel/bpf/syscall.c:5795 [inline] __se_sys_bpf kernel/bpf/syscall.c:5793 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5793 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: 0033:0x7fdc79c5b239 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff5780f908 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdc79c5b239 RDX: 0000000000000050 RSI: 0000000020000240 RDI: 000000000000000a RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dev_map_enqueue+0x31/0x3e0 kernel/bpf/devmap.c:539 Code: 41 56 41 55 41 54 53 48 83 ec 18 49 89 d4 49 89 f5 48 89 fd 49 be 00 00 00 00 00 fc ff df e8 46 9c d7 ff 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 a0 5e 3d 00 4c 8b 7d 00 48 83 c5 RSP: 0018:ffffc9000343f678 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807eb31e00 RDX: 0000000000000000 RSI: ffff88802224a070 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff89625806 R09: ffffffff896257c3 R10: 0000000000000004 R11: ffff88807eb31e00 R12: ffff8880151d8000 R13: ffff88802224a070 R14: dffffc0000000000 R15: 0000000000000000 FS: 00005555867d5380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdc79c59303 CR3: 0000000022bc8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 56 push %r14 2: 41 55 push %r13 4: 41 54 push %r12 6: 53 push %rbx 7: 48 83 ec 18 sub $0x18,%rsp b: 49 89 d4 mov %rdx,%r12 e: 49 89 f5 mov %rsi,%r13 11: 48 89 fd mov %rdi,%rbp 14: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 1b: fc ff df 1e: e8 46 9c d7 ff call 0xffd79c69 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 a0 5e 3d 00 call 0x3d5ed9 39: 4c 8b 7d 00 mov 0x0(%rbp),%r15 3d: 48 rex.W 3e: 83 .byte 0x83 3f: c5 .byte 0xc5 --- 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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