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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2785:b0:3d2:aa73:7b7a with SMTP id e9e14a558f8ab-3d88ed8d70emr151088955ab.12.1745289626073; Mon, 21 Apr 2025 19:40:26 -0700 (PDT) Date: Mon, 21 Apr 2025 19:40:26 -0700 In-Reply-To: <0000000000009e3ae2061a97c386@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6807019a.050a0220.380c13.0001.GAE@google.com> Subject: Re: [syzbot] [hams?] KASAN: slab-use-after-free Read in rose_get_neigh From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, ralf@linux-mips.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9d7a0577c9db gcc-15: disable '-Wunterminated-string-initia.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=139b5ccc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=efa83f9a6dd67d67 dashboard link: https://syzkaller.appspot.com/bug?extid=e04e2c007ba2c80476cb 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=15652c70580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17676c70580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/97d5bc2781eb/disk-9d7a0577.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/25887608b61e/vmlinux-9d7a0577.xz kernel image: https://storage.googleapis.com/syzbot-assets/505d68dbd87d/bzImage-9d7a0577.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e04e2c007ba2c80476cb@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in rose_get_neigh+0x549/0x640 net/rose/rose_route.c:692 Read of size 1 at addr ffff888036f04c30 by task syz-executor234/6532 CPU: 0 UID: 0 PID: 6532 Comm: syz-executor234 Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 rose_get_neigh+0x549/0x640 net/rose/rose_route.c:692 rose_connect+0x2d4/0x1540 net/rose/af_rose.c:816 __sys_connect_file+0x13e/0x1a0 net/socket.c:2038 __sys_connect+0x14d/0x170 net/socket.c:2057 __do_sys_connect net/socket.c:2063 [inline] __se_sys_connect net/socket.c:2060 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2060 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb5b7a9cc29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1f 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb5b7223168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fb5b7b22438 RCX: 00007fb5b7a9cc29 RDX: 0000000000000040 RSI: 0000200000000040 RDI: 0000000000000006 RBP: 00007fb5b7b22430 R08: 00007fb5b72236c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb5b7b2243c R13: 000000000000006e R14: 00007ffe0d8e5c80 R15: 00007ffe0d8e5d68 Allocated by task 5886: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] rose_add_node net/rose/rose_route.c:85 [inline] rose_rt_ioctl+0x87e/0x1d40 net/rose/rose_route.c:747 rose_ioctl+0x64d/0x7d0 net/rose/af_rose.c:1380 sock_do_ioctl+0x115/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6532: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2398 [inline] slab_free mm/slub.c:4656 [inline] kfree+0x2b6/0x4d0 mm/slub.c:4855 rose_remove_neigh+0x25e/0x370 net/rose/rose_route.c:240 rose_rt_device_down+0x2aa/0x390 net/rose/rose_route.c:522 rose_device_event+0xfc/0x120 net/rose/af_rose.c:248 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_notify_flags+0x1f7/0x2e0 net/core/dev.c:9407 netif_change_flags+0x108/0x160 net/core/dev.c:9434 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 dev_ifsioc+0x1498/0x1f70 net/core/dev_ioctl.c:565 dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821 sock_do_ioctl+0x19d/0x280 net/socket.c:1204 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888036f04c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of freed 512-byte region [ffff888036f04c00, ffff888036f04e00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36f04 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b441c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b441c80 dead000000000122 0000000000000000 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0000dbc101 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5825, tgid 5825 (syz-executor234), ts 69568665808, free_ts 69397287194 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab mm/slub.c:2632 [inline] new_slab+0x244/0x340 mm/slub.c:2686 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3872 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x33f/0x18e0 net/ipv6/route.c:3802 addrconf_f6i_alloc+0x391/0x670 net/ipv6/route.c:4631 ipv6_add_addr+0x531/0x1fe0 net/ipv6/addrconf.c:1121 inet6_addr_add+0x256/0x960 net/ipv6/addrconf.c:3049 inet6_rtm_newaddr+0x1619/0x1c70 net/ipv6/addrconf.c:5060 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 page last free pid 5827 tgid 5827 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2730 [inline] __put_partials+0x16d/0x1c0 mm/slub.c:3199 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] __kmalloc_cache_noprof+0x1f1/0x3e0 mm/slub.c:4367 kmalloc_noprof include/linux/slab.h:905 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:664 [inline] netdevice_event+0x365/0x9d0 drivers/infiniband/core/roce_gid_mgmt.c:823 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] netif_set_mac_address+0x378/0x4a0 net/core/dev.c:9601 do_setlink.constprop.0+0x9f1/0x44b0 net/core/rtnetlink.c:3103 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 Memory state around the buggy address: ffff888036f04b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888036f04b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888036f04c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888036f04c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888036f04d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.