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Message-ID: <67f36908.050a0220.0a13.027f.GAE@google.com>
Date: Sun, 06 Apr 2025 22:56:24 -0700
From: syzbot <syzbot+10d145ea96fc91185445@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
horms@...nel.org, kuba@...nel.org, kuniyu@...zon.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com,
sdf@...ichev.me, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] general protection fault in addrconf_add_ifaddr
Hello,
syzbot found the following issue on:
HEAD commit: 8bc251e5d874 Merge tag 'nf-25-04-03' of git://git.kernel.o..
git tree: net
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14981178580000
kernel config: https://syzkaller.appspot.com/x/.config?x=24f9c4330e7c0609
dashboard link: https://syzkaller.appspot.com/bug?extid=10d145ea96fc91185445
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=120f023f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e5c94c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a500d5daba83/disk-8bc251e5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2459c792199a/vmlinux-8bc251e5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/558655fb055e/bzImage-8bc251e5.xz
The issue was bisected to:
commit 8965c160b8f7333df895321c8aa6bad4a7175f2b
Author: Stanislav Fomichev <sdf@...ichev.me>
Date: Tue Apr 1 16:34:44 2025 +0000
net: use netif_disable_lro in ipv6_add_dev
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1334423f980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=10b4423f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1734423f980000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10d145ea96fc91185445@...kaller.appspotmail.com
Fixes: 8965c160b8f7 ("net: use netif_disable_lro in ipv6_add_dev")
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000198: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000cc0-0x0000000000000cc7]
CPU: 1 UID: 0 PID: 5850 Comm: syz-executor155 Not tainted 6.14.0-syzkaller-12504-g8bc251e5d874 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline]
RIP: 0010:addrconf_add_ifaddr+0x23e/0x590 net/ipv6/addrconf.c:3157
Code: 03 00 00 8b b4 24 c4 00 00 00 48 8b 7c 24 18 e8 18 a3 25 ff 49 89 c5 48 8d 98 c5 0c 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 38 <42> 0f b6 04 20 84 c0 0f 85 03 03 00 00 48 89 5c 24 28 0f b6 1b 31
RSP: 0018:ffffc90003f3fa00 EFLAGS: 00010203
RAX: 0000000000000198 RBX: 0000000000000cc5 RCX: ffff88807bf51e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9ac50c80
RBP: ffffc90003f3fb50 R08: ffffffff905fc777 R09: 1ffffffff20bf8ee
R10: dffffc0000000000 R11: fffffbfff20bf8ef R12: dffffc0000000000
R13: 0000000000000000 R14: 00002000000000c0 R15: 1ffff920007e7f48
FS: 0000555559d6c380(0000) GS:ffff888125099000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c2 CR3: 000000003508e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
inet6_ioctl+0x148/0x280 net/ipv6/af_inet6.c:580
sock_do_ioctl+0x15a/0x490 net/socket.c:1190
sock_ioctl+0x644/0x900 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff0337e62e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdf3f7f118 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffdf3f7f2e8 RCX: 00007ff0337e62e9
RDX: 00002000000000c0 RSI: 0000000000008916 RDI: 0000000000000003
RBP: 00007ff033859610 R08: 0000000000000000 R09: 00007ffdf3f7f2e8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdf3f7f2d8 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:30 [inline]
RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline]
RIP: 0010:addrconf_add_ifaddr+0x23e/0x590 net/ipv6/addrconf.c:3157
Code: 03 00 00 8b b4 24 c4 00 00 00 48 8b 7c 24 18 e8 18 a3 25 ff 49 89 c5 48 8d 98 c5 0c 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 38 <42> 0f b6 04 20 84 c0 0f 85 03 03 00 00 48 89 5c 24 28 0f b6 1b 31
RSP: 0018:ffffc90003f3fa00 EFLAGS: 00010203
RAX: 0000000000000198 RBX: 0000000000000cc5 RCX: ffff88807bf51e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9ac50c80
RBP: ffffc90003f3fb50 R08: ffffffff905fc777 R09: 1ffffffff20bf8ee
R10: dffffc0000000000 R11: fffffbfff20bf8ef R12: dffffc0000000000
R13: 0000000000000000 R14: 00002000000000c0 R15: 1ffff920007e7f48
FS: 0000555559d6c380(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004585c0 CR3: 000000003508e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 00 add (%rax),%eax
2: 00 8b b4 24 c4 00 add %cl,0xc424b4(%rbx)
8: 00 00 add %al,(%rax)
a: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi
f: e8 18 a3 25 ff call 0xff25a32c
14: 49 89 c5 mov %rax,%r13
17: 48 8d 98 c5 0c 00 00 lea 0xcc5(%rax),%rbx
1e: 48 89 d8 mov %rbx,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 48 89 44 24 38 mov %rax,0x38(%rsp)
* 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 03 03 00 00 jne 0x33a
37: 48 89 5c 24 28 mov %rbx,0x28(%rsp)
3c: 0f b6 1b movzbl (%rbx),%ebx
3f: 31 .byte 0x31
---
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.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
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If you want to overwrite report's subsystems, reply with:
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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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