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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a48:b0:373:8d04:28b2 with SMTP id e9e14a558f8ab-375e00059bemr6072995ab.0.1718627044424; Mon, 17 Jun 2024 05:24:04 -0700 (PDT) Date: Mon, 17 Jun 2024 05:24:04 -0700 In-Reply-To: <20240617102946.1524-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007c0e06061b150a3b@google.com> Subject: Re: [syzbot] [ntfs3?] KASAN: slab-use-after-free Read in chrdev_open From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Read in chrdev_open loop0: detected capacity change from 0 to 4096 ================================================================== BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x4c/0xf0 lib/list_debug.c:29 Read of size 8 at addr ffff8880433aba48 by task syz-executor.0/5464 CPU: 1 PID: 5464 Comm: syz-executor.0 Not tainted 6.10.0-rc3-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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 __list_add_valid_or_report+0x4c/0xf0 lib/list_debug.c:29 __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add include/linux/list.h:169 [inline] chrdev_open+0x2a9/0x630 fs/char_dev.c:396 do_dentry_open+0x98f/0x1750 fs/open.c:958 do_open fs/namei.c:3650 [inline] path_openat+0x289f/0x3280 fs/namei.c:3807 do_filp_open+0x235/0x490 fs/namei.c:3834 do_sys_openat2+0x13e/0x1d0 fs/open.c:1408 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1434 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 RIP: 0033:0x7f6f9567dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f6f963b60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6f957abf80 RCX: 00007f6f9567dea9 RDX: 0000000000000000 RSI: 0000000020002140 RDI: ffffffffffffff9c RBP: 00007f6f956ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6f957abf80 R15: 00007fffeeba0e38 Allocated by task 5451: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 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_lru_noprof+0x139/0x2b0 mm/slub.c:4020 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:563 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x69/0x1e0 fs/inode.c:1007 new_inode+0x22/0x1d0 fs/inode.c:1033 ntfs_new_inode+0x45/0x100 fs/ntfs3/fsntfs.c:1688 ntfs_create_inode+0x5f1/0x3680 fs/ntfs3/inode.c:1347 ntfs_mknod+0x3c/0x50 fs/ntfs3/namei.c:122 vfs_mknod+0x36d/0x3b0 fs/namei.c:4009 do_mknodat+0x3ec/0x5b0 __do_sys_mknodat fs/namei.c:4087 [inline] __se_sys_mknodat fs/namei.c:4084 [inline] __x64_sys_mknodat+0xa9/0xc0 fs/namei.c:4084 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 16: 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] kmem_cache_free+0x145/0x350 mm/slub.c:4512 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 __dentry_kill+0x20d/0x630 fs/dcache.c:603 shrink_kill+0xa9/0x2c0 fs/dcache.c:1048 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1075 shrink_dcache_parent+0xcb/0x3b0 do_one_tree+0x23/0xe0 fs/dcache.c:1538 shrink_dcache_for_umount+0x7d/0x130 fs/dcache.c:1555 generic_shutdown_super+0x6a/0x2d0 fs/super.c:620 kill_block_super+0x44/0x90 fs/super.c:1676 ntfs3_kill_sb+0x44/0x1b0 fs/ntfs3/super.c:1798 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1275 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 ffff8880433ab3a0 which belongs to the cache ntfs_inode_cache of size 1760 The buggy address is located 1704 bytes inside of freed 1760-byte region [ffff8880433ab3a0, ffff8880433aba80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x433a8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802367d401 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff88801a37bc80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080110011 00000001ffffefff ffff88802367d401 head: 00fff00000000040 ffff88801a37bc80 dead000000000122 0000000000000000 head: 0000000000000000 0000000080110011 00000001ffffefff ffff88802367d401 head: 00fff00000000003 ffffea00010cea01 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 Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5451, tgid 5450 (syz-executor.0), ts 85231803751, free_ts 15194610819 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] kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4020 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:563 alloc_inode fs/inode.c:261 [inline] iget5_locked+0xa4/0x280 fs/inode.c:1235 ntfs_iget5+0xd5/0x3b10 fs/ntfs3/inode.c:532 ntfs_security_init+0x110/0xcc0 fs/ntfs3/fsntfs.c:1882 ntfs_fill_super+0x4329/0x4a20 fs/ntfs3/super.c:1530 get_tree_bdev+0x3f7/0x570 fs/super.c:1615 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3360 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2583 free_contig_range+0x9e/0x160 mm/page_alloc.c:6637 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1038 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1418 do_one_initcall+0x248/0x880 init/main.c:1267 do_initcall_level+0x157/0x210 init/main.c:1329 do_initcalls+0x3f/0x80 init/main.c:1345 kernel_init_freeable+0x435/0x5d0 init/main.c:1578 kernel_init+0x1d/0x2b0 init/main.c:1467 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880433ab900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880433ab980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880433aba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880433aba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880433abb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Tested on: commit: 83a7eefe Linux 6.10-rc3 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=14c92012980000 kernel config: https://syzkaller.appspot.com/x/.config?x=c79815c08cc14227 dashboard link: https://syzkaller.appspot.com/bug?extid=5d34cc6474499a5ff516 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=17df5446980000