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Message-ID: <CALAgD-77-2pS6L2=xCKBLDpvQejExZ2jWLnOWRsd1whwRXKn_A@mail.gmail.com> Date: Sat, 24 Aug 2024 21:42:59 -0700 From: Xingyu Li <xli399@....edu> To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org, shaozhengchao@...wei.com, horms@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: BUG: general protection fault in fib_rules_event Hi, We found a bug in Linux 6.10. It seems like a null pointer dereference bug. The bug report is as follow: Bug report: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 19006 Comm: syz-executor Not tainted 6.10.0 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:detach_rules net/core/fib_rules.c:1231 [inline] RIP: 0010:fib_rules_event+0x998/0xc00 net/core/fib_rules.c:1263 Code: 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 e0 8b 0a f9 4d 8b 27 4d 39 fc 0f 84 d1 01 00 00 4d 8d 74 24 10 4d 89 f5 49 c1 ed 03 <41> 0f b6 44 1d 00 84 c0 0f 85 fe 00 00 00 41 8b 2e 48 8b 04 24 0f RSP: 0000:ffffc90002e17548 EFLAGS: 00010202 RAX: ffffffff88e9d1bf RBX: dffffc0000000000 RCX: ffff88801c229e00 RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff88e9d15f R09: ffffffff88e9c7c7 R10: 0000000000000003 R11: ffff88801c229e00 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000010 R15: ffff888135ce6080 FS: 0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555597f281c0 CR3: 0000000026ad2000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> notifier_call_chain kernel/notifier.c:93 [inline] raw_notifier_call_chain+0xe0/0x180 kernel/notifier.c:461 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] unregister_netdevice_many_notify+0xd65/0x16d0 net/core/dev.c:11219 unregister_netdevice_many net/core/dev.c:11277 [inline] unregister_netdevice_queue+0x2ff/0x370 net/core/dev.c:11156 unregister_netdevice include/linux/netdevice.h:3119 [inline] __tun_detach+0x6ad/0x15e0 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x104/0x1b0 drivers/net/tun.c:3500 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x239/0x2f0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa13/0x2560 kernel/exit.c:876 do_group_exit+0x1fd/0x2b0 kernel/exit.c:1025 get_signal+0x1697/0x1730 kernel/signal.c:2909 arch_do_signal_or_restart+0x92/0x7f0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x95/0x280 kernel/entry/common.c:218 do_syscall_64+0x8a/0x150 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x67/0x6f RIP: 0033:0x7f1dd437f3fc Code: Unable to access opcode bytes at 0x7f1dd437f3d2. RSP: 002b:00007ffded2aa8f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007f1dd437f3fc RDX: 0000000000000028 RSI: 00007ffded2aa9a0 RDI: 00000000000000f9 RBP: 00007ffded2aa94c R08: 0000000000000000 R09: 0079746972756365 R10: 00007f1dd45147e0 R11: 0000000000000246 R12: 0000555579f775eb R13: 0000555579f77590 R14: 000000000008620e R15: 00007ffded2aa9a0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:detach_rules net/core/fib_rules.c:1231 [inline] RIP: 0010:fib_rules_event+0x998/0xc00 net/core/fib_rules.c:1263 Code: 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 e0 8b 0a f9 4d 8b 27 4d 39 fc 0f 84 d1 01 00 00 4d 8d 74 24 10 4d 89 f5 49 c1 ed 03 <41> 0f b6 44 1d 00 84 c0 0f 85 fe 00 00 00 41 8b 2e 48 8b 04 24 0f RSP: 0000:ffffc90002e17548 EFLAGS: 00010202 RAX: ffffffff88e9d1bf RBX: dffffc0000000000 RCX: ffff88801c229e00 RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff88e9d15f R09: ffffffff88e9c7c7 R10: 0000000000000003 R11: ffff88801c229e00 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000010 R15: ffff888135ce6080 FS: 0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc95549118 CR3: 000000000d932000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 8: 74 08 je 0x12 a: 4c 89 ff mov %r15,%rdi d: e8 e0 8b 0a f9 call 0xf90a8bf2 12: 4d 8b 27 mov (%r15),%r12 15: 4d 39 fc cmp %r15,%r12 18: 0f 84 d1 01 00 00 je 0x1ef 1e: 4d 8d 74 24 10 lea 0x10(%r12),%r14 23: 4d 89 f5 mov %r14,%r13 26: 49 c1 ed 03 shr $0x3,%r13 * 2a: 41 0f b6 44 1d 00 movzbl 0x0(%r13,%rbx,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 0f 85 fe 00 00 00 jne 0x136 38: 41 8b 2e mov (%r14),%ebp 3b: 48 8b 04 24 mov (%rsp),%rax 3f: 0f .byte 0xf -- Yours sincerely, Xingyu
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