From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81E5C1B3724 for ; Thu, 10 Oct 2024 08:19:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728548380; cv=none; b=IKrnqCJPoz6FNVnSr8U5r5zrWzwCyzBperJ9jl+4/jimy8GcwD2R7gvSbSrLvywOM/DdW05ohKLGtycLOXb5fYRVNi7vPkub+3ZhL57e+/ETBKA+SU2WSOJ4pXOtdDsKp0eRfuLeNnpZs3aJ/+ZqTJoijqQ1+JmQxSPfKbDznLA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728548380; c=relaxed/simple; bh=+XNTr/7F9GzXEiLAha18qCWZFzo9/K3PklHkGPT4zO8=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=TK18H2AI07IOSlsMxeynaoQJxxIQGoesB8eSZxsdWlFTmEh5dir7lYlWYEEg2SGmU8k3KF5g+OyYfj9P3Mf2W+dZCpkKOQ9hTYQLivd29UMqe48OsMRvZhH726Uf8+inBjJHxl8gU9zVdrtVP9Xff2MWys3Py+arTRce6koqTlo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=f7VU25TA; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="f7VU25TA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728548378; x=1760084378; h=date:from:to:cc:subject:message-id:mime-version; bh=+XNTr/7F9GzXEiLAha18qCWZFzo9/K3PklHkGPT4zO8=; b=f7VU25TAEQnyJnQ+fbrDnMGIbyDl39dyswRmL9BfB53j5mvXvaQgP8nU 7Lp+LAY0yQPMHtsA4NDGUWOScOtisUCbdUl4+lfVb4b2NvX9ifTDhQRTM mWa+BYHPBsRngZu4rj8eEmxaWTL8nlJnqnY+JBNNn75ZgYYzBpAAeOMBm /05K3jJP5vDZOHOnuGyBu7RkQbWv+H1rwG61mKOtEgbsqxN/KS0casyj+ jjYrMWMX41Yz8DUJRz9ba40ATnll2ye0daagb5th3ylnOa/g8fnh+FfkW J0TEbLBChmEGYkLufmsVJ6UgN108ZmGDC2WNXjx70b3arwVQKyP4eupSE w==; X-CSE-ConnectionGUID: HOZ6ClUiTm6DpeXqS4EYSQ== X-CSE-MsgGUID: h5a0GU14S1yWndv6p2x/yw== X-IronPort-AV: E=McAfee;i="6700,10204,11220"; a="39252806" X-IronPort-AV: E=Sophos;i="6.11,192,1725346800"; d="scan'208";a="39252806" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2024 01:19:38 -0700 X-CSE-ConnectionGUID: 3qiNs5+BR3C99Cr0OmkMAw== X-CSE-MsgGUID: KNpFddM0R/uNFw/+YwPsEA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,192,1725346800"; d="scan'208";a="81092288" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.161.23]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2024 01:19:37 -0700 Date: Thu, 10 Oct 2024 16:18:37 +0800 From: "Lai, Yi" To: edumazet@google.com Cc: syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, yi1.lai@intel.com Subject: [Syzkaller & bisect] There is KASAN: slab-use-after-free Read in __nf_unregister_net_hook in v6.12-rc1 Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi Eric, Greetings! I used Syzkaller and found that there is KASAN: slab-use-after-free Read in __nf_unregister_net_hook in v6.12-rc1 After bisection and the first bad commit is: " 78c3253f27e5 net: use synchronize_rcu_expedited in cleanup_net() " All detailed into can be found at: https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook Syzkaller repro code: https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook/repro.c Syzkaller repro syscall steps: https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook/repro.prog Syzkaller report: https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook/repro.report Kconfig(make olddefconfig): https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook/kconfig_origin Bisect info: https://github.com/laifryiee/syzkaller_logs/tree/main/241001_170248___nf_unregister_net_hook/bisect_info.log bzImage: https://github.com/laifryiee/syzkaller_logs/raw/refs/heads/main/241001_170248___nf_unregister_net_hook/bzImage_9852d85ec9d492ebef56dc5f229416c925758edc Issue dmesg: https://github.com/laifryiee/syzkaller_logs/blob/main/241001_170248___nf_unregister_net_hook/9852d85ec9d492ebef56dc5f229416c925758edc_dmesg.log " [ 16.910304] ================================================================== [ 16.910757] BUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0 [ 16.911156] Read of size 8 at addr ffff8880106fe400 by task repro/725 [ 16.911529] [ 16.911674] CPU: 1 UID: 0 PID: 725 Comm: repro Not tainted 6.12.0-rc1-9852d85ec9d4+ #1 [ 16.912338] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 16.913460] Call Trace: [ 16.913859] [ 16.913983] dump_stack_lvl+0xea/0x150 [ 16.914262] print_report+0xce/0x610 [ 16.914585] ? __nf_unregister_net_hook+0x640/0x6b0 [ 16.914845] ? kasan_complete_mode_report_info+0x80/0x200 [ 16.915133] ? __nf_unregister_net_hook+0x640/0x6b0 [ 16.915497] kasan_report+0xcc/0x110 [ 16.915687] ? __nf_unregister_net_hook+0x640/0x6b0 [ 16.916082] ? __pfx_bpf_link_release+0x10/0x10 [ 16.916398] __asan_report_load8_noabort+0x18/0x20 [ 16.916655] __nf_unregister_net_hook+0x640/0x6b0 [ 16.916895] ? __pfx_bpf_link_release+0x10/0x10 [ 16.917177] ? __pfx_bpf_link_release+0x10/0x10 [ 16.917467] nf_unregister_net_hook+0xea/0x140 [ 16.917770] bpf_nf_link_release+0xda/0x1e0 [ 16.917983] bpf_link_free+0x139/0x2d0 [ 16.918187] bpf_link_release+0x68/0x80 [ 16.918397] __fput+0x414/0xb60 [ 16.918603] ____fput+0x22/0x30 [ 16.918777] task_work_run+0x19c/0x2b0 [ 16.919006] ? __pfx_task_work_run+0x10/0x10 [ 16.919235] ? free_nsproxy+0x344/0x470 [ 16.919448] ? switch_task_namespaces+0xf9/0x110 [ 16.919711] do_exit+0xb19/0x2a30 [ 16.919913] ? audit_log_end+0x156/0x2c0 [ 16.920202] ? __pfx_do_exit+0x10/0x10 [ 16.920419] ? audit_seccomp+0x1b2/0x220 [ 16.920656] ? audit_seccomp+0x1b9/0x220 [ 16.920872] __secure_computing+0x2f5/0x350 [ 16.921109] syscall_trace_enter+0x9b/0x230 [ 16.921354] do_syscall_64+0x115/0x140 [ 16.921551] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 16.921816] RIP: 0033:0x7f2464518a4d [ 16.922038] Code: Unable to access opcode bytes at 0x7f2464518a23. [ 16.922363] RSP: 002b:00007ffe02122928 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 16.922759] RAX: ffffffffffffffda RBX: 00007f24645f69e0 RCX: 00007f2464518a4d [ 16.923163] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000 [ 16.923583] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020 [ 16.923965] R10: 00007ffe021227d0 R11: 0000000000000246 R12: 00007f24645f69e0 [ 16.924353] R13: 00007f24645fbf00 R14: 0000000000000001 R15: 00007f24645fbee8 [ 16.924750] [ 16.924870] [ 16.924962] Allocated by task 725: [ 16.925153] kasan_save_stack+0x2c/0x60 [ 16.925387] kasan_save_track+0x18/0x40 [ 16.925607] kasan_save_alloc_info+0x3c/0x50 [ 16.925853] __kasan_slab_alloc+0x62/0x80 [ 16.926065] kmem_cache_alloc_noprof+0x114/0x370 [ 16.926334] copy_net_ns+0xf0/0x6e0 [ 16.926520] create_new_namespaces+0x403/0xb40 [ 16.926769] unshare_nsproxy_namespaces+0xca/0x200 [ 16.927038] ksys_unshare+0x424/0xa10 [ 16.927242] __x64_sys_unshare+0x3a/0x50 [ 16.927451] x64_sys_call+0xcf1/0x20d0 [ 16.927670] do_syscall_64+0x6d/0x140 [ 16.927888] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 16.928148] [ 16.928243] Freed by task 51: [ 16.928414] kasan_save_stack+0x2c/0x60 [ 16.928631] kasan_save_track+0x18/0x40 [ 16.928841] kasan_save_free_info+0x3f/0x60 [ 16.929073] __kasan_slab_free+0x3d/0x60 [ 16.929308] kmem_cache_free+0x1aa/0x550 [ 16.929529] cleanup_net+0x8af/0xae0 [ 16.929745] process_one_work+0x92e/0x1b50 [ 16.929981] worker_thread+0x68d/0xe90 [ 16.930204] kthread+0x35a/0x470 [ 16.930424] ret_from_fork+0x56/0x90 [ 16.930626] ret_from_fork_asm+0x1a/0x30 [ 16.930843] [ 16.930935] The buggy address belongs to the object at ffff8880106fd400 [ 16.930935] which belongs to the cache net_namespace of size 6912 [ 16.931597] The buggy address is located 4096 bytes inside of [ 16.931597] freed 6912-byte region [ffff8880106fd400, ffff8880106fef00) [ 16.932280] [ 16.932430] The buggy address belongs to the physical page: [ 16.932757] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106f8 [ 16.933195] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 16.933592] memcg:ffff88801157d281 [ 16.933783] flags: 0xfffffc0000040(head|node=0|zone=1|lastcpupid=0x1fffff) [ 16.934155] page_type: f5(slab) [ 16.934329] raw: 000fffffc0000040 ffff88800d71cdc0 dead000000000122 0000000000000000 [ 16.934782] raw: 0000000000000000 0000000080040004 00000001f5000000 ffff88801157d281 [ 16.935209] head: 000fffffc0000040 ffff88800d71cdc0 dead000000000122 0000000000000000 [ 16.935610] head: 0000000000000000 0000000080040004 00000001f5000000 ffff88801157d281 [ 16.936038] head: 000fffffc0000003 ffffea000041be01 ffffffffffffffff 0000000000000000 [ 16.936507] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 16.936913] page dumped because: kasan: bad access detected [ 16.937285] [ 16.937398] Memory state around the buggy address: [ 16.937698] ffff8880106fe300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.938149] ffff8880106fe380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.938634] >ffff8880106fe400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.939010] ^ " I hope you find it useful. Regards, Yi Lai --- If you don't need the following environment to reproduce the problem or if you already have one reproduced environment, please ignore the following information. How to reproduce: git clone https://gitlab.com/xupengfe/repro_vm_env.git cd repro_vm_env tar -xvf repro_vm_env.tar.gz cd repro_vm_env; ./start3.sh // it needs qemu-system-x86_64 and I used v7.1.0 // start3.sh will load bzImage_2241ab53cbb5cdb08a6b2d4688feb13971058f65 v6.2-rc5 kernel // You could change the bzImage_xxx as you want // Maybe you need to remove line "-drive if=pflash,format=raw,readonly=on,file=./OVMF_CODE.fd \" for different qemu version You could use below command to log in, there is no password for root. ssh -p 10023 root@localhost After login vm(virtual machine) successfully, you could transfer reproduced binary to the vm by below way, and reproduce the problem in vm: gcc -pthread -o repro repro.c scp -P 10023 repro root@localhost:/root/ Get the bzImage for target kernel: Please use target kconfig and copy it to kernel_src/.config make olddefconfig make -jx bzImage //x should equal or less than cpu num your pc has Fill the bzImage file into above start3.sh to load the target kernel in vm. Tips: If you already have qemu-system-x86_64, please ignore below info. If you want to install qemu v7.1.0 version: git clone https://github.com/qemu/qemu.git cd qemu git checkout -f v7.1.0 mkdir build cd build yum install -y ninja-build.x86_64 yum -y install libslirp-devel.x86_64 ../configure --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-sdl --enable-usb-redir --enable-slirp make make install