From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (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 EFCD91474D0 for ; Tue, 25 Jun 2024 10:40:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719312025; cv=none; b=rBWvKuvM7NuIZos5MiY+gqEJilZSU7IytpNE/r7FdesdmTzgW8FYSPLfF4VizlTZpujJIX5rZ8jE8OfwIUU503WTPOSES0n/EyhFUAF/ylgmKcOdTDCTX8gPOyIz9i1AWFek9GGkk07pi54mMsjfNERIzPaNpSbODODv/T+Vdko= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719312025; c=relaxed/simple; bh=jjhsMyjBLNs167Af6fVDgk/N3EnAWClOVNHl0njYCVI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pjzcKxgk5h0GYW+FPKy0doQwKkXK4zxCGqPGL3CKLH8tELWnqs69aIBj8SZxVJkFSivXqIshCLIePd5KnY51bE8PTYTK7FcEjeRoJHqSWx7aL3wnq37/iuA+BaH/ATfDvbBroZHk9+3aNQ2HGZyRwC6RXWGJZxL1iFqgYKEOySU= 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=209.85.166.77 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-io1-f77.google.com with SMTP id ca18e2360f4ac-7eb7c3b8cf8so756882839f.0 for ; Tue, 25 Jun 2024 03:40:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719312023; x=1719916823; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=kgK1UFS4la58AQXniOmAAEiQhzWNq/pJ7+mm67p0TCE=; b=UYCGCu19JK6TRWcqxyvW0BPS+xNBEY/SeFg/l/kIghzb0Wu/PSN2VwrCyLgQQHOp/y XxtP2FQBXftFmX8Iin8HI3C9yOJx8ZYOBkSb7FQpa+57OK+5w82nWCYWSI5eckaOZ1oy jqTud1AQJR7590Yd3VvpWhDnUM2rHfT1Co7cKco7MsZeMbDAg3NGqRLOSl2dNXtySPuG ksks9/JRbjFiKzxfILXG/0sq40EIWilum40Hc0daKkoRkKIAhxGFRuPlYy8yC0yvixtd l/YP5Pt5KwGTTtZfMIQzmK8sBVqcgjJXoQT8ALAf2Q9wpa263+HnEQM+/FssBEFAVU3A BY/A== X-Forwarded-Encrypted: i=1; AJvYcCWnI8BEkveJvISD8cqcaUhtzk1vfP1qKHhJJ+95IjXx6BYcrG+e4ymoAhEHgYcharHItb361KgOz3gGZn0dwz5PuKochNSU X-Gm-Message-State: AOJu0YxgXg6pg5hiWoh1oWdWDTAe3QNWldFOJE36WUKge87UfUpT25LC LZHCqGmmMReItcAr2AdbP21t84Vk0F+mpm5Kx6OXy/iof9cHS7cBf19HoSXwXk4PEnW05QViky1 AFGJnDzFOrycmu2u+H8EPKUlzNDdM7yYuMu4CrynFn1ThiYagTvKo0Xc= X-Google-Smtp-Source: AGHT+IFvedSYlmHHh9pZoEksqt4QcM/uvNnSwmGL5ce63/aO/e9CtJ2kwNTf+XxzmK7vF9QZVtnhqfwK4nCjNMf9/iXXo7jFDlyk Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:8906:b0:4b9:b122:d08f with SMTP id 8926c6da1cb9f-4b9efbea327mr234949173.6.1719312021006; Tue, 25 Jun 2024 03:40:21 -0700 (PDT) Date: Tue, 25 Jun 2024 03:40:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000454110061bb48619@google.com> Subject: [syzbot] [net?] KASAN: slab-use-after-free Read in l2tp_tunnel_del_work From: syzbot To: davem@davemloft.net, edumazet@google.com, 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: b0d3969d2b4d net: ethernet: rtsn: Add support for Renesas .. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1790b32e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=e78fc116033e0ab7 dashboard link: https://syzkaller.appspot.com/bug?extid=b471b7c936301a59745b 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=14a90fb1980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7aada183897f/disk-b0d3969d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9518258e6c30/vmlinux-b0d3969d.xz kernel image: https://storage.googleapis.com/syzbot-assets/9d4a19845f65/bzImage-b0d3969d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b471b7c936301a59745b@syzkaller.appspotmail.com wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ================================================================== BUG: KASAN: slab-use-after-free in l2tp_tunnel_del_work+0xe5/0x330 net/l2tp/l2tp_core.c:1334 Read of size 8 at addr ffff88801ff3c0b8 by task kworker/u8:0/11 CPU: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.10.0-rc4-syzkaller-00836-gb0d3969d2b4d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: l2tp l2tp_tunnel_del_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 l2tp_tunnel_del_work+0xe5/0x330 net/l2tp/l2tp_core.c:1334 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5308: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] l2tp_session_create+0x3b/0xc20 net/l2tp/l2tp_core.c:1675 pppol2tp_connect+0xca3/0x17a0 net/l2tp/l2tp_ppp.c:782 __sys_connect_file net/socket.c:2049 [inline] __sys_connect+0x2df/0x310 net/socket.c:2066 __do_sys_connect net/socket.c:2076 [inline] __se_sys_connect net/socket.c:2073 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2073 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 24: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x149/0x360 mm/slub.c:4558 __sk_destruct+0x58/0x5f0 net/core/sock.c:2191 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2809 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3072 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3176 pppol2tp_release+0x24b/0x350 net/l2tp/l2tp_ppp.c:457 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801ff3c000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 184 bytes inside of freed 1024-byte region [ffff88801ff3c000, ffff88801ff3c400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ff38 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015041dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015041dc0 dead000000000122 0000000000000000 head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea00007fce01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 170500836332, free_ts 170485857715 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2e43/0x2f00 mm/page_alloc.c:3420 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4678 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2265 allocate_slab+0x5a/0x2f0 mm/slub.c:2428 new_slab mm/slub.c:2481 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667 __slab_alloc+0x58/0xa0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4142 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:666 alloc_skb include/linux/skbuff.h:1320 [inline] nlmsg_new include/net/netlink.h:1015 [inline] inet6_rt_notify+0xdf/0x290 net/ipv6/route.c:6180 fib6_add_rt2node net/ipv6/ip6_fib.c:1266 [inline] fib6_add+0x1e33/0x4430 net/ipv6/ip6_fib.c:1495 __ip6_ins_rt net/ipv6/route.c:1314 [inline] ip6_ins_rt+0x106/0x170 net/ipv6/route.c:1324 __ipv6_ifa_notify+0x5d2/0x1230 net/ipv6/addrconf.c:6267 ipv6_ifa_notify net/ipv6/addrconf.c:6306 [inline] addrconf_dad_completed+0x181/0xcd0 net/ipv6/addrconf.c:4319 addrconf_dad_work+0xdc2/0x16f0 page last free pid 5306 tgid 5306 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2583 discard_slab mm/slub.c:2527 [inline] __put_partials+0xeb/0x130 mm/slub.c:2995 put_cpu_partial+0x17c/0x250 mm/slub.c:3070 __slab_free+0x2ea/0x3d0 mm/slub.c:4307 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4008 ptlock_alloc mm/memory.c:6444 [inline] ptlock_init include/linux/mm.h:2968 [inline] pmd_ptlock_init include/linux/mm.h:3068 [inline] pagetable_pmd_ctor include/linux/mm.h:3106 [inline] pmd_alloc_one_noprof include/asm-generic/pgalloc.h:141 [inline] __pmd_alloc+0x110/0x630 mm/memory.c:5925 pmd_alloc include/linux/mm.h:2866 [inline] __handle_mm_fault mm/memory.c:5483 [inline] handle_mm_fault+0xf4c/0x1ba0 mm/memory.c:5688 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Memory state around the buggy address: ffff88801ff3bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801ff3c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ff3c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ff3c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ff3c180: 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 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