From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71F57C6FA86 for ; Tue, 27 Sep 2022 10:52:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231429AbiI0Kwo (ORCPT ); Tue, 27 Sep 2022 06:52:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231247AbiI0Kwl (ORCPT ); Tue, 27 Sep 2022 06:52:41 -0400 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE66910CA72 for ; Tue, 27 Sep 2022 03:52:40 -0700 (PDT) Received: by mail-il1-f197.google.com with SMTP id k6-20020a92c246000000b002f80993e780so6546052ilo.13 for ; Tue, 27 Sep 2022 03:52:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date; bh=CCI4JCWesHxQYpGABAjBNdE2vpv5Ggt3Vpj/S4NlBos=; b=WbF2xu+Fcuw9K/3mfPiten6mNNgV5trH5HVo+UFmwQ4XjaC/zsQKkohId2uVY2gFXw EHXtJaStYSGedz4uFY25z0+hX9GysGZfoavXX21iq0XHObznj79YucawDkkPdcKm4ZWq B3yystQBzsSqxYJ9bzFQhZCc2GGn8W29UUM7zkbZiYVQl2y1d0gXuzN7lDklasPXWhu0 tcL0GzWAib1TBDOQ4pcEY8WYrSyfUhHrqK9XfILI5d3D2ii6G30/F27WxbaakUvE1UoT e1lIl99iUbIpAlf1xHE5e+B5o3IujSzK3dgk8cMVE4Fy6fkBaHOsFMwranUEkYGeIAf8 iccQ== X-Gm-Message-State: ACrzQf35r91FIcZLVzGT6KPFCnjpAHTDtWZQUpuAu6yqZnoveFOtCKxA +CVH67b7q7b9uuvDPSUYk42Zv6Csedz4w/FsRO2eIC1OUjOr X-Google-Smtp-Source: AMsMyM5Wf1XEO/s1l//RN1/VMEdrJPip8ZZqB3cRJ/0sLuovG18a+0nOFizWpeKUOHP8Lg8vp/JAzBQa8ZV+Oi8iLhd5mYg8EtzM MIME-Version: 1.0 X-Received: by 2002:a05:6638:304b:b0:341:d6bc:7bd9 with SMTP id u11-20020a056638304b00b00341d6bc7bd9mr14624993jak.294.1664275960197; Tue, 27 Sep 2022 03:52:40 -0700 (PDT) Date: Tue, 27 Sep 2022 03:52:40 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006a789905e9a67167@google.com> Subject: [syzbot] KASAN: use-after-free Read in register_shrinker_prepared (2) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=139c8540880000 kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294 dashboard link: https://syzkaller.appspot.com/bug?extid=ff796f04613b4c84ad89 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/95c7bf83c07e/disk-aaa11ce2.raw.xz vmlinux: https://storage.googleapis.com/b161cd56a7a3/vmlinux-aaa11ce2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ff796f04613b4c84ad89@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 Read of size 8 at addr ffff88807c60b5c8 by task syz-executor.0/9090 CPU: 1 PID: 9090 Comm: syz-executor.0 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] register_shrinker_prepared+0x37/0x120 mm/vmscan.c:695 sget_fc+0x5e7/0x7c0 fs/super.c:581 vfs_get_super fs/super.c:1163 [inline] get_tree_nodev+0x24/0x1d0 fs/super.c:1198 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f691348a669 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6914629168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f69135abf80 RCX: 00007f691348a669 RDX: 0000000020000100 RSI: 0000000020000180 RDI: 0000000000000000 RBP: 00007f69134e5560 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda5cb705f R14: 00007f6914629300 R15: 0000000000022000 Allocated by task 9062: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] kzalloc include/linux/slab.h:695 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:125 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3193 __do_sys_unshare kernel/fork.c:3264 [inline] __se_sys_unshare kernel/fork.c:3262 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 9062: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 ops_init+0xcd/0x470 net/core/net_namespace.c:140 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3193 __do_sys_unshare kernel/fork.c:3264 [inline] __se_sys_unshare kernel/fork.c:3262 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2796 netlink_release+0xeff/0x1db0 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_release+0x87/0x1b0 net/socket.c:678 netlink_kernel_release+0x4b/0x60 net/netlink/af_netlink.c:2107 genl_pernet_exit+0x34/0x70 net/netlink/genetlink.c:1416 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:163 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2796 netlink_release+0xeff/0x1db0 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_release+0x87/0x1b0 net/socket.c:678 netlink_kernel_release+0x4b/0x60 net/netlink/af_netlink.c:2107 rdma_dev_exit_net+0x32e/0x550 drivers/infiniband/core/device.c:1152 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:163 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88807c60b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1480 bytes inside of 2048-byte region [ffff88807c60b000, ffff88807c60b800) The buggy address belongs to the physical page: page:ffffea0001f18200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xdead000000000100 pfn:0x7c608 head:ffffea0001f18200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011842000 dead000000080008 0000000000000000 raw: dead000000000100 dead000000000122 00000001ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5290, tgid 5287 (syz-executor.3), ts 351717085963, free_ts 351714173315 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 __do_kmalloc_node mm/slab_common.c:933 [inline] __kmalloc+0x44/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] kzalloc include/linux/slab.h:695 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:125 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3193 __do_sys_unshare kernel/fork.c:3264 [inline] __se_sys_unshare kernel/fork.c:3262 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2532 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:754 [inline] slab_alloc_node mm/slub.c:3336 [inline] slab_alloc mm/slub.c:3344 [inline] __kmem_cache_alloc_lru mm/slub.c:3351 [inline] kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3360 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:320 vfs_fstatat+0x73/0xb0 fs/stat.c:266 __do_sys_newfstatat+0x94/0x120 fs/stat.c:437 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807c60b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c60b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807c60b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c60b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c60b680: 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.