syzbot


KASAN: slab-use-after-free Read in chrdev_open

Status: upstream: reported C repro on 2024/04/26 12:00
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+5d34cc6474499a5ff516@syzkaller.appspotmail.com
First crash: 53d, last: 22d
Cause bisection: introduced by (bisect log) :
commit ef9297007e9904588682699e618c56401f61d1c2
Author: Kari Argillander <kari.argillander@gmail.com>
Date: Thu Sep 2 15:40:49 2021 +0000

  fs/ntfs3: Make binary search to search smaller chunks in beginning

Crash: KASAN: use-after-free Read in chrdev_open (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] KASAN: slab-use-after-free Read in chrdev_open 16 (35) 2024/06/17 12:24
[PATCH] fs/ntfs3: dealing with situations where dir_search_u may return null 1 (1) 2024/06/02 09:56
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: use-after-free Read in chrdev_open C error 14 657d 1223d 0/1 upstream: reported C repro on 2021/02/11 04:55
android-54 general protection fault in chrdev_open C 1 741d 741d 0/2 auto-obsoleted due to no activity on 2023/04/22 08:07
linux-4.14 KASAN: use-after-free Read in chrdev_open C error 4 658d 1231d 0/1 upstream: reported C repro on 2021/02/03 08:18
android-5-10 general protection fault in chrdev_open C error 1 741d 740d 2/2 fixed on 2023/08/02 14:36
Last patch testing requests (18)
Created Duration User Patch Repo Result
2024/06/17 10:30 1h06m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b report log
2024/06/16 11:15 53m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b error OK
2024/06/16 06:33 51m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b error OK
2024/06/15 10:40 1h07m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b report log
2024/06/15 06:48 51m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b report log
2024/06/15 00:04 1h06m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b error OK
2024/06/14 12:48 43m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b error OK
2024/06/02 09:22 19m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e33c4963bf53 OK log
2024/05/29 11:49 11m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2024/05/28 22:58 11m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2024/05/28 11:08 11m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2024/05/27 23:57 24m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2024/05/27 11:30 16m almaz.alexandrovich@paragon-software.com upstream report log
2024/05/10 02:36 12m retest repro upstream report log
2024/04/27 10:44 10m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e33c4963bf53 report log
2024/04/27 09:18 11m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e33c4963bf53 report log
2024/04/27 06:29 11m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e33c4963bf53 report log
2024/04/27 02:06 12m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e33c4963bf53 report log

Sample crash report:
==================================================================
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 ffff888076eed7c8 by task syz-executor427/5079

CPU: 0 PID: 5079 Comm: syz-executor427 Not tainted 6.9.0-rc5-syzkaller-00053-ge33c4963bf53 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __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+0x907/0x15a0 fs/open.c:955
 do_open fs/namei.c:3642 [inline]
 path_openat+0x2860/0x3240 fs/namei.c:3799
 do_filp_open+0x235/0x490 fs/namei.c:3826
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1432
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f722cb71329
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff23332778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f722cb71329
RDX: 0000000000000000 RSI: 0000000020002140 RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 00007fff233327b0 R09: 00007fff233327b0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2333279c
R13: 0000000000000001 R14: 431bde82d7b634db R15: 00007fff233327d0
 </TASK>

Allocated by task 5077:
 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:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc_lru+0x178/0x350 mm/slub.c:3864
 alloc_inode_sb include/linux/fs.h:3091 [inline]
 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:557
 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+0x687/0x3c30 fs/ntfs3/inode.c:1333
 ntfs_mknod+0x41/0x60 fs/ntfs3/namei.c:128
 vfs_mknod+0x36d/0x3b0 fs/namei.c:4001
 do_mknodat+0x3ec/0x5b0
 __do_sys_mknodat fs/namei.c:4079 [inline]
 __se_sys_mknodat fs/namei.c:4076 [inline]
 __x64_sys_mknodat+0xa9/0xc0 fs/namei.c:4076
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 0:
 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+0xa6/0xe0 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:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:4344
 rcu_do_batch kernel/rcu/tree.c:2196 [inline]
 rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
 __do_softirq+0x2c6/0x980 kernel/softirq.c:554

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:2734 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838
 __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:619
 kill_block_super+0x44/0x90 fs/super.c:1675
 ntfs3_kill_sb+0x44/0x1b0 fs/ntfs3/super.c:1785
 deactivate_locked_super+0xc4/0x130 fs/super.c:472
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 ptrace_notify+0x2d2/0x380 kernel/signal.c:2404
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x273/0x370 kernel/entry/common.c:218
 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888076eed120
 which belongs to the cache ntfs_inode_cache of size 1760
The buggy address is located 1704 bytes inside of
 freed 1760-byte region [ffff888076eed120, ffff888076eed800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76ee8
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000840 ffff888019777dc0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
head: 00fff80000000840 ffff888019777dc0 dead000000000122 0000000000000000
head: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
head: 00fff80000000003 ffffea0001dbba01 dead000000000122 00000000ffffffff
head: 0000000800000000 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 0xd2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5077, tgid 1360935967 (syz-executor427), ts 5077, free_ts 25749663853
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317
 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2175
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2391
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc_lru+0x253/0x350 mm/slub.c:3864
 alloc_inode_sb include/linux/fs.h:3091 [inline]
 ntfs_alloc_inode+0x28/0x80 fs/ntfs3/super.c:557
 alloc_inode fs/inode.c:261 [inline]
 iget5_locked+0xa4/0x280 fs/inode.c:1235
 ntfs_iget5+0xc7/0x3b70 fs/ntfs3/inode.c:525
 ntfs_fill_super+0x2f01/0x49c0 fs/ntfs3/super.c:1300
 get_tree_bdev+0x3f7/0x570 fs/super.c:1614
 vfs_get_tree+0x90/0x2a0 fs/super.c:1779
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
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:1141 [inline]
 free_unref_page_prepare+0x97b/0xaa0 mm/page_alloc.c:2347
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
 free_contig_range+0x9e/0x160 mm/page_alloc.c:6572
 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1036
 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1416
 do_one_initcall+0x248/0x880 init/main.c:1245
 do_initcall_level+0x157/0x210 init/main.c:1307
 do_initcalls+0x3f/0x80 init/main.c:1323
 kernel_init_freeable+0x435/0x5d0 init/main.c:1555
 kernel_init+0x1d/0x2b0 init/main.c:1444
 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:
 ffff888076eed680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888076eed700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888076eed780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888076eed800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888076eed880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/26 01:42 upstream e33c4963bf53 8bdc0f22 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: slab-use-after-free Read in chrdev_open
2024/04/26 01:01 upstream e33c4963bf53 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-use-after-free Read in chrdev_open
* Struck through repros no longer work on HEAD.