From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A3E171EBA1E for ; Thu, 1 May 2025 14:38:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746110318; cv=none; b=d8BIxeAKPQbHmESf9RO5tJT6DC9yj5vvGvhv1Q0m17w7W9IgJ366O5UKA9wOYrYiuQsRzjpyczPg9HL2XbN7lMbp2D+4iK32ozYMiomMF8z25yHgXyUAEJeq4t8PYOmYQjruKArRNk8TZah5fdRfYmKraFwDibyz9/jRrfUgx1c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746110318; c=relaxed/simple; bh=KCkjp+EpuR8S9I6wB/cD5poo1xuHeOtCrvFhXFMGsGc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=p39c3U7/zDN8ZzYmylU9zrq6GFwi8s6nTxA7vFZ2IeYA+L1cOaUPiF7lBhxCiPEi344WBt28zfmSzfvon2YINKI5sZ3a3UR/9fPjSMH9za1DZ6nlHdUSzusvZs4ZWohaOxVl+g1uHPEd0VapJ1Ub7KF/IGPO8oGchLUNgnBtRr8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.206 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f206.google.com with SMTP id e9e14a558f8ab-3d458e61faaso11419605ab.0 for ; Thu, 01 May 2025 07:38:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746110316; x=1746715116; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=bKT3CYx5Pp/t3vJLkcUCm39fapLPEuWc8A4ri9U3ddY=; b=XiVWwlzsiNHMwqitqFlPbjcsAtY4jdZwSxALlWDV2yt5yu7RUbjcl9d4PdiUuLIBrN JaakEUQWKos5QEek4/27vDaPMC/cdLKWgBf1ZYEIhufYNGyyL9A7Gad20TQs/33S81K/ T65dfpahEV3hjtPHmIywQEFWbLKhJw/3AoyhUEIxr2awskNdsad2Tg2UQuSDPVtyZ1lc kgc3hOzSwORBOhoK9chQ0wmFb+YElZPmqMzlSYgWVYEzpTDYrDysTF5dS9m1Q9u806a0 uUmwx0nb7kOPdo7bok8hKMX6KXpG1iv99fW/dTdq4Dw+CpNurUmxCYNvCiii6fjs7UvA Iusg== X-Forwarded-Encrypted: i=1; AJvYcCWVE+Hbrybw3M7RWFikPouIREV7tSI9SPyGTxM8tkWW0wrUdgvQKTT+AT+nxxCZ6/ebRp6XWvg=@vger.kernel.org X-Gm-Message-State: AOJu0YzLFA2V3RxJuUW5U0wgtMsaSpOHR++8JJmMqJ7KUsAH+AZpE8mw ivdAiHcPGWsB5uFUeiEtSNf7fMiIh3jQ7yCRaRjnGLPN1ZNIE7YeJS6EtecCM7+mraSXrNWOQA+ lcj7COyRR94gYLK4uYM7VTntQthPiCOWT+ILavXi20k2reNAMYboxZig= X-Google-Smtp-Source: AGHT+IFW1RvcxF1W+8esYW4nnWpbjFRstR87BcxGy+Vj6deAijA+e1yU/Ssn1eDn0QZXOUSVDHXBBs/RCbKLqlT/X66vvcgUrgZa Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:ce4d:0:b0:3d8:122f:9f07 with SMTP id e9e14a558f8ab-3d970babe0fmr26951955ab.10.1746110315769; Thu, 01 May 2025 07:38:35 -0700 (PDT) Date: Thu, 01 May 2025 07:38:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6813876b.050a0220.14dd7d.0011.GAE@google.com> Subject: [syzbot] [batman?] KASAN: slab-use-after-free Write in batadv_forw_packet_queue From: syzbot To: antonio@mandelbit.com, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, marek.lindner@mailbox.org, netdev@vger.kernel.org, pabeni@redhat.com, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4f79eaa2ceac kbuild: Properly disable -Wunterminated-strin.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11996f74580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a42a9d552788177b dashboard link: https://syzkaller.appspot.com/bug?extid=4a354e37723883878eed compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/822d3af2e031/disk-4f79eaa2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1a60cd781b04/vmlinux-4f79eaa2.xz kernel image: https://storage.googleapis.com/syzbot-assets/37d5d556e0a9/bzImage-4f79eaa2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4a354e37723883878eed@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:1026 [inline] BUG: KASAN: slab-use-after-free in batadv_forw_packet_queue+0x187/0x260 net/batman-adv/send.c:688 Write of size 8 at addr ffff888026fc7c08 by task kworker/u8:2/21326 CPU: 1 UID: 0 PID: 21326 Comm: kworker/u8:2 Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xb4/0x290 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 hlist_add_head include/linux/list.h:1026 [inline] batadv_forw_packet_queue+0x187/0x260 net/batman-adv/send.c:688 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:857 [inline] batadv_iv_ogm_schedule+0xabd/0xea0 net/batman-adv/bat_iv_ogm.c:876 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1720 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 21326: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4372 kmalloc_noprof include/linux/slab.h:905 [inline] batadv_forw_packet_alloc+0x1e9/0x390 net/batman-adv/send.c:519 batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:571 [inline] batadv_iv_ogm_queue_add+0x85f/0xd30 net/batman-adv/bat_iv_ogm.c:678 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:857 [inline] batadv_iv_ogm_schedule+0xabd/0xea0 net/batman-adv/bat_iv_ogm.c:876 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1720 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 21326: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 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+0x193/0x440 mm/slub.c:4855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548 insert_work+0x3d/0x330 kernel/workqueue.c:2183 __queue_work+0xbd9/0xfe0 kernel/workqueue.c:2345 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1835 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x646/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff888026fc7c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff888026fc7c00, ffff888026fc7e00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26fc4 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 ffff88801a041c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a041c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea00009bf101 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 3510, tgid 3510 (kworker/u8:7), ts 186249926857, free_ts 186186911857 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x21c7/0x22a0 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3872 __slab_alloc mm/slub.c:3962 [inline] __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4367 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] device_private_init drivers/base/core.c:3537 [inline] device_add+0xbe/0xb50 drivers/base/core.c:3588 netdev_register_kobject+0x156/0x2f0 net/core/net-sysfs.c:2336 register_netdevice+0x126c/0x1af0 net/core/dev.c:11009 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:960 [inline] nsim_create+0xb19/0xef0 drivers/net/netdevsim/netdev.c:1028 __nsim_dev_port_add+0x70a/0xb20 drivers/net/netdevsim/dev.c:1393 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1449 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1501 [inline] nsim_dev_reload_up+0x451/0x780 drivers/net/netdevsim/dev.c:988 devlink_reload+0x4e9/0x8d0 net/devlink/dev.c:474 devlink_pernet_pre_exit+0x1d9/0x3d0 net/devlink/core.c:509 page last free pid 5188 tgid 5188 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xb05/0xcd0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2730 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3199 put_cpu_partial+0x17c/0x250 mm/slub.c:3274 __slab_free+0x2f7/0x400 mm/slub.c:4526 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 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] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4217 vm_area_dup+0x2b/0x5c0 kernel/fork.c:488 dup_mmap kernel/fork.c:672 [inline] dup_mm kernel/fork.c:1734 [inline] copy_mm+0xbe1/0x2100 kernel/fork.c:1786 copy_process+0x16d3/0x3b80 kernel/fork.c:2429 kernel_clone+0x224/0x7f0 kernel/fork.c:2844 __do_sys_clone kernel/fork.c:2987 [inline] __se_sys_clone kernel/fork.c:2971 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2971 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888026fc7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888026fc7b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888026fc7c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026fc7c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026fc7d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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 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