Date:   Sun, 17 Jul 2022 14:52:57 -0700
From:   Dipanjan Das <mail.dipanjan.das@...il.com>
To:     almaz.alexandrovich@...agon-software.com, ntfs3@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     syzkaller@...glegroups.com
Subject: KASAN: use-after-free Read in run_unpack

Hi,

We would like to report the following bug which has been found by our
modified version of syzkaller.

======================================================
description: KASAN: use-after-free Read in run_unpack
affected file: fs/ntfs3/run.c
kernel version: 5.19-rc6
kernel commit: 32346491ddf24599decca06190ebca03ff9de7f8
git tree: upstream
kernel config: attached
crash reproducer: none
======================================================
Crash log:
======================================================
BUG: KASAN: use-after-free in run_unpack+0x89a/0x940 fs/ntfs3/run.c:897
Read of size 1 at addr ffff88817deb7178 by task syz-executor.7/24027

CPU: 1 PID: 24027 Comm: syz-executor.7 Tainted: G           OE
5.19.0-rc6-g2eae0556bb9d #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 <TASK>
 __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:313 [inline]
 print_report.cold+0xe5/0x659 mm/kasan/report.c:429
 kasan_report+0x8a/0x1b0 mm/kasan/report.c:491
 run_unpack+0x89a/0x940 fs/ntfs3/run.c:897
 run_unpack_ex+0xb8/0x680 fs/ntfs3/run.c:1010
 ntfs_read_mft fs/ntfs3/inode.c:368 [inline]
 ntfs_iget5+0xc11/0x3230 fs/ntfs3/inode.c:500
 ntfs_fill_super+0x2815/0x4b30 fs/ntfs3/super.c:1122
 get_tree_bdev+0x440/0x760 fs/super.c:1292
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1228/0x1cb0 fs/namespace.c:3370
 do_mount+0xf3/0x110 fs/namespace.c:3383
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x18f/0x230 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+0x46/0xb0
RIP: 0033:0x7f157008fe8e
Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 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:00007f157111b9f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f157008fe8e
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f157111ba50
RBP: 00007f157111ba90 R08: 00007f157111ba90 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f157111ba50 R15: 000000002007aa80
 </TASK>

Allocated by task 24027:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:39
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:441 [inline]
 ____kasan_kmalloc mm/kasan/common.c:526 [inline]
 ____kasan_kmalloc mm/kasan/common.c:479 [inline]
 __kasan_kmalloc+0xb5/0xe0 mm/kasan/common.c:535
 kasan_kmalloc include/linux/kasan.h:234 [inline]
 __kmalloc+0x1c9/0x4c0 mm/slub.c:4446
 kmalloc include/linux/slab.h:605 [inline]
 mi_init+0x8c/0xf0 fs/ntfs3/record.c:105
 ntfs_read_mft fs/ntfs3/inode.c:53 [inline]
 ntfs_iget5+0x3ca/0x3230 fs/ntfs3/inode.c:500
 ntfs_fill_super+0x26a1/0x4b30 fs/ntfs3/super.c:1085
 get_tree_bdev+0x440/0x760 fs/super.c:1292
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1228/0x1cb0 fs/namespace.c:3370
 do_mount+0xf3/0x110 fs/namespace.c:3383
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x18f/0x230 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+0x46/0xb0

Freed by task 24027:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:39
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:378
 ____kasan_slab_free mm/kasan/common.c:371 [inline]
 ____kasan_slab_free mm/kasan/common.c:329 [inline]
 __kasan_slab_free+0x12b/0x1a0 mm/kasan/common.c:379
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1754 [inline]
 slab_free_freelist_hook mm/slub.c:1780 [inline]
 slab_free mm/slub.c:3536 [inline]
 kfree+0xec/0x4b0 mm/slub.c:4584
 mi_clear fs/ntfs3/ntfs_fs.h:1105 [inline]
 ni_clear+0x287/0x690 fs/ntfs3/frecord.c:132
 evict+0x2ed/0x5a0 fs/inode.c:664
 iput_final fs/inode.c:1744 [inline]
 iput.part.0+0x5d2/0x800 fs/inode.c:1770
 iput+0x58/0x70 fs/inode.c:1760
 ntfs_fill_super+0x27ca/0x4b30 fs/ntfs3/super.c:1112
 get_tree_bdev+0x440/0x760 fs/super.c:1292
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1228/0x1cb0 fs/namespace.c:3370
 do_mount+0xf3/0x110 fs/namespace.c:3383
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x18f/0x230 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+0x46/0xb0

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:39
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:356
 call_rcu kernel/rcu/tree.c:3126 [inline]
 call_rcu+0x99/0x740 kernel/rcu/tree.c:3101
 netlink_release+0xe42/0x1cb0 net/netlink/af_netlink.c:815
 __sock_release+0xcd/0x280 net/socket.c:650
 sock_close+0x18/0x20 net/socket.c:1365
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xe0/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x253/0x260 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88817deb7000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 376 bytes inside of
 2048-byte region [ffff88817deb7000, ffff88817deb7800)

The buggy address belongs to the physical page:
page:ffffea0005f7ac00 refcount:1 mapcount:0 mapping:0000000000000000
index:0x0 pfn:0x17deb0
head:ffffea0005f7ac00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x17ff00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 017ff00000010200 ffffea0005a5d200 dead000000000002 ffff888100042000
raw: 0000000000000000 0000000080080008 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
0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC),
pid 6709, tgid 6709 (syz-executor.6), ts 103552445322, free_ts
103518093507
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2449 [inline]
 prep_new_page+0x297/0x330 mm/page_alloc.c:2456
 get_page_from_freelist+0x2142/0x3c80 mm/page_alloc.c:4198
 __alloc_pages+0x321/0x710 mm/page_alloc.c:5426
 alloc_pages+0x119/0x250 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab mm/slub.c:1969 [inline]
 new_slab+0x2a9/0x3f0 mm/slub.c:2029
 ___slab_alloc+0xd5a/0x1140 mm/slub.c:3031
 __slab_alloc.isra.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmalloc+0x3a9/0x4c0 mm/slub.c:4442
 kmalloc include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 ops_init+0xfb/0x420 net/core/net_namespace.c:124
 setup_net+0x5d7/0xc60 net/core/net_namespace.c:325
 copy_net_ns+0x2d9/0x660 net/core/net_namespace.c:471
 create_new_namespaces.isra.0+0x3cb/0xae0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc8/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x450/0x920 kernel/fork.c:3174
 __do_sys_unshare kernel/fork.c:3245 [inline]
 __se_sys_unshare kernel/fork.c:3243 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3243
 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:1371 [inline]
 free_pcp_prepare+0x51f/0xd00 mm/page_alloc.c:1421
 free_unref_page_prepare mm/page_alloc.c:3343 [inline]
 free_unref_page+0x19/0x5b0 mm/page_alloc.c:3438
 do_slab_free mm/slub.c:3524 [inline]
 ___cache_free+0x12c/0x140 mm/slub.c:3543
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x13d/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:451
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook+0x4d/0x4f0 mm/slab.h:750
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x1be/0x460 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:655
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:987
 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x314/0xba0 fs/sysfs/group.c:148
 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:188
 internal_create_groups fs/sysfs/group.c:184 [inline]
 sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:214
 device_add_groups drivers/base/core.c:2483 [inline]
 device_add_attrs drivers/base/core.c:2642 [inline]
 device_add+0x1545/0x1da0 drivers/base/core.c:3379

Memory state around the buggy address:
 ffff88817deb7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88817deb7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88817deb7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff88817deb7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88817deb7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

-- 
Thanks & Regards,

Dipanjan

Download attachment "5.19-rc6.config" of type "application/octet-stream" (232249 bytes)

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