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Message-ID: <67caa2b1.050a0220.15b4b9.0077.GAE@google.com> Date: Thu, 06 Mar 2025 23:39:29 -0800 From: syzbot <syzbot+0c7bfd8cf3aecec92708@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...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?] general protection fault in bpf_map_offload_map_alloc Hello, syzbot found the following issue on: HEAD commit: 2525e16a2bae Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14d18878580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fbc61e4c6e816b7b dashboard link: https://syzkaller.appspot.com/bug?extid=0c7bfd8cf3aecec92708 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/bae047feb57e/disk-2525e16a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9f10529c6bdd/vmlinux-2525e16a.xz kernel image: https://storage.googleapis.com/syzbot-assets/8dcb6d0a6029/bzImage-2525e16a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0c7bfd8cf3aecec92708@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000197: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000cb8-0x0000000000000cbf] CPU: 1 UID: 0 PID: 9913 Comm: syz.1.1316 Not tainted 6.14.0-rc5-syzkaller-01064-g2525e16a2bae #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:netdev_need_ops_lock include/linux/netdevice.h:2792 [inline] RIP: 0010:netdev_lock_ops include/linux/netdevice.h:2803 [inline] RIP: 0010:bpf_map_offload_map_alloc+0x19a/0x910 kernel/bpf/offload.c:533 Code: 48 89 44 24 30 42 80 3c 20 00 74 08 48 89 df e8 ac e6 3b 00 48 89 5c 24 18 4c 89 2b 49 8d 9d bd 0c 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 df 06 00 00 0f b6 1b 31 ff 89 de e8 dd RSP: 0018:ffffc90002e67bc0 EFLAGS: 00010203 RAX: 0000000000000197 RBX: 0000000000000cbd RCX: ffff8880307ebc00 RDX: 0000000000000000 RSI: 0000000067ff0009 RDI: 0000000000000009 RBP: ffffc90002e67cd8 R08: ffffffff89c99bd3 R09: 1ffffffff207a16e R10: dffffc0000000000 R11: fffffbfff207a16f R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888062af0000 R15: 1ffff920005ccf80 FS: 00007f142b0266c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f142b025f98 CR3: 00000000622c6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> map_create+0x946/0x11c0 kernel/bpf/syscall.c:1455 __sys_bpf+0x6d3/0x820 kernel/bpf/syscall.c:5777 __do_sys_bpf kernel/bpf/syscall.c:5902 [inline] __se_sys_bpf kernel/bpf/syscall.c:5900 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5900 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: 0033:0x7f142a18d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f142b026038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f142a3a5fa0 RCX: 00007f142a18d169 RDX: 0000000000000048 RSI: 0000400000000000 RDI: 0000000000000000 RBP: 00007f142a20e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f142a3a5fa0 R15: 00007fff7b881dc8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netdev_need_ops_lock include/linux/netdevice.h:2792 [inline] RIP: 0010:netdev_lock_ops include/linux/netdevice.h:2803 [inline] RIP: 0010:bpf_map_offload_map_alloc+0x19a/0x910 kernel/bpf/offload.c:533 Code: 48 89 44 24 30 42 80 3c 20 00 74 08 48 89 df e8 ac e6 3b 00 48 89 5c 24 18 4c 89 2b 49 8d 9d bd 0c 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 df 06 00 00 0f b6 1b 31 ff 89 de e8 dd RSP: 0018:ffffc90002e67bc0 EFLAGS: 00010203 RAX: 0000000000000197 RBX: 0000000000000cbd RCX: ffff8880307ebc00 RDX: 0000000000000000 RSI: 0000000067ff0009 RDI: 0000000000000009 RBP: ffffc90002e67cd8 R08: ffffffff89c99bd3 R09: 1ffffffff207a16e R10: dffffc0000000000 R11: fffffbfff207a16f R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888062af0000 R15: 1ffff920005ccf80 FS: 00007f142b0266c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c38c00f98 CR3: 00000000622c6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 44 24 30 mov %rax,0x30(%rsp) 5: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) a: 74 08 je 0x14 c: 48 89 df mov %rbx,%rdi f: e8 ac e6 3b 00 call 0x3be6c0 14: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 19: 4c 89 2b mov %r13,(%rbx) 1c: 49 8d 9d bd 0c 00 00 lea 0xcbd(%r13),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 df 06 00 00 jne 0x716 37: 0f b6 1b movzbl (%rbx),%ebx 3a: 31 ff xor %edi,%edi 3c: 89 de mov %ebx,%esi 3e: e8 .byte 0xe8 3f: dd .byte 0xdd --- 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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