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AJvYcCUttQMmHO/OGxKGnJY1iOzddcZ45C19j9dLcbGojEYDG5xgdy9EvFf5W5g51dN3VrQpvchA6lF71wi1oA0=@vger.kernel.org X-Gm-Message-State: AOJu0Yz8Ag4FCx4i0hoLcDKWW4Sptr+qY25HN4O6ZPEM/gc2VgArbFM7 +/3sRaijHxhUMKRXFYqR3qtIqPBMMpv9Yf0UiT5fVZGmvFQnFMjhFG7p0+bsMVuvX9OTpSSjBQr dSvL9/6zGtsMntT3z0dYL9Sj1l3O8hbgCWW/KNnNFcDmv/pzbcPRtzBY= X-Google-Smtp-Source: AGHT+IEwI6B+dlKHv/y/aEPxt0aVvx7ZJ7WD6o5hHU84RsVaN6gwX/WD2oCD2wet+VskTJ0A07Ju6JKY057qQT4hNakRZV6worUV Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:17c7:b0:3d9:6d60:709e with SMTP id e9e14a558f8ab-3d97ada9f06mr73351205ab.4.1746285985151; Sat, 03 May 2025 08:26:25 -0700 (PDT) Date: Sat, 03 May 2025 08:26:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <681635a1.a70a0220.254cdc.001e.GAE@google.com> Subject: [syzbot] [net?] KASAN: global-out-of-bounds Read in fib6_ifdown (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 95d3481af6dc Merge tag 'spi-fix-v6.15-rc4' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16fe6a70580000 kernel config: https://syzkaller.appspot.com/x/.config?x=541aa584278da96c dashboard link: https://syzkaller.appspot.com/bug?extid=ba503006f24effba2ba0 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13bca0f4580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-95d3481a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6ece5d5205be/vmlinux-95d3481a.xz kernel image: https://storage.googleapis.com/syzbot-assets/eba7ece24cf0/bzImage-95d3481a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ba503006f24effba2ba0@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in fib6_ifdown+0x7f5/0x8f0 net/ipv6/route.c:4901 Read of size 8 at addr ffffffff9af98530 by task syz-executor/19807 CPU: 3 UID: 0 PID: 19807 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00256-g95d3481af6dc #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 fib6_ifdown+0x7f5/0x8f0 net/ipv6/route.c:4901 fib6_clean_node+0x2a4/0x5b0 net/ipv6/ip6_fib.c:2199 fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2124 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2172 fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2252 __fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4951 [inline] rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:4956 addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3854 addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3777 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2176 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] dev_close_many+0x319/0x630 net/core/dev.c:1731 unregister_netdevice_many_notify+0x578/0x26f0 net/core/dev.c:11952 unregister_netdevice_many net/core/dev.c:12046 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11889 unregister_netdevice include/linux/netdevice.h:3374 [inline] __tun_detach+0x1249/0x1540 drivers/net/tun.c:620 tun_detach drivers/net/tun.c:636 [inline] tun_chr_close+0xc2/0x230 drivers/net/tun.c:3390 __fput+0x3ff/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xafb/0x2c30 kernel/exit.c:953 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fae80990887 Code: Unable to access opcode bytes at 0x7fae8099085d. RSP: 002b:00007ffc98e694b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000029 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 00007fae80990887 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 000000000000000a RBP: 00007ffc98e69bec R08: 00007ffc98e694dc R09: 0079746972756365 R10: 00007ffc98e69540 R11: 0000000000000206 R12: 00007fae80b7ec80 R13: 00000000000927c0 R14: 000000000003d637 R15: 00007fae80b80e40 The buggy address belongs to the variable: __key.0+0x30/0x40 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1af98 flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002000 ffffea00006be608 ffffea00006be608 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffffffff9af98400: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 ffffffff9af98480: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 >ffffffff9af98500: 00 00 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 ^ ffffffff9af98580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f9 ffffffff9af98600: f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9 ================================================================== --- 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@googlegroups.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 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. 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