Hello,
I found the following issue using syzkaller on:
HEAD commit : e60276b8c11ab4a8be23807bc67b04
8cfb937dfa (v6.0.8)
git tree: stable
C Reproducer : https://gist.github.com/oswalpalash/bed0eba75def3cdd34a285428e9bcdc4
Kernel .config :
https://gist.github.com/oswalpalash/0962c70d774e5ec736a047bba917cecb
Console log :
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110
Read of size 8 at addr ffff8880273c4358 by task syz-executor.1/6475
CPU: 0 PID: 6475 Comm: syz-executor.1 Not tainted 6.0.8-pasta #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xcd/0x134
print_report.cold+0xe5/0x63a
kasan_report+0x8a/0x1b0
__list_del_entry_valid+0xf2/0x110
inode_cgwb_move_to_attached+0x2ee/0x4e0
writeback_single_inode+0x3fa/0x510
write_inode_now+0x16a/0x1e0
blkdev_flush_mapping+0x168/0x220
blkdev_put_whole+0xd1/0xf0
blkdev_put+0x29b/0x700
deactivate_locked_super+0x8c/0xf0
deactivate_super+0xad/0xd0
cleanup_mnt+0x347/0x4b0
task_work_run+0xe0/0x1a0
exit_to_user_mode_prepare+0x25d/0x270
syscall_exit_to_user_mode+0x19/0x50
do_syscall_64+0x42/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f22bd29143b
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6
e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 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:00007ffe505103b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f22bd29143b
RDX: 00007f22bd228a90 RSI: 000000000000000a RDI: 00007ffe50510480
RBP: 00007ffe50510480 R08: 00007f22bd2fba1f R09: 00007ffe50510240
R10: 00000000fffffffb R11: 0000000000000246 R12: 00007f22bd2fb9f8
R13: 00007ffe50511520 R14: 0000555556f4bd90 R15: 0000000000000032
</TASK>
Allocated by task 7810:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x85/0xb0
kmem_cache_alloc_lru+0x25b/0xfb0
fat_alloc_inode+0x23/0x1e0
alloc_inode+0x61/0x1e0
new_inode_pseudo+0x13/0x80
new_inode+0x1b/0x40
fat_build_inode+0x146/0x2d0
vfat_create+0x249/0x390
lookup_open+0x10bc/0x1640
path_openat+0xa42/0x2840
do_filp_open+0x1ca/0x2a0
do_sys_openat2+0x61b/0x990
do_sys_open+0xc3/0x140
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 16:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0xf5/0x180
kmem_cache_free.part.0+0xfc/0x4a0
i_callback+0x3f/0x70
rcu_core+0x785/0x1720
__do_softirq+0x1d0/0x908
Last potentially related work creation:
kasan_save_stack+0x1e/0x40
__kasan_record_aux_stack+0x7e/0x90
call_rcu+0x99/0x740
destroy_inode+0x129/0x1b0
iput.part.0+0x5cd/0x800
iput+0x58/0x70
dentry_unlink_inode+0x2e2/0x4a0
__dentry_kill+0x374/0x5e0
dput+0x656/0xbe0
__fput+0x3cc/0xa90
task_work_run+0xe0/0x1a0
exit_to_user_mode_prepare+0x25d/0x270
syscall_exit_to_user_mode+0x19/0x50
do_syscall_64+0x42/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff8880273c4080
which belongs to the cache fat_inode_cache of size 1488
The buggy address is located 728 bytes inside of
1488-byte region [ffff8880273c4080, ffff8880273c4650)
The buggy address belongs to the physical page:
page:ffffea00009cf100 refcount:1 mapcount:0 mapping:0000000000000000
index:0xffff8880273c4ffe pfn:0x273c4
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00009cf0c8 ffff88801820e450 ffff888103e00e00
raw: ffff8880273c4ffe ffff8880273c4080 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask
0x242050(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE|__GFP_RECLAIMABLE),
pid 7810, tgid 7808 (syz-executor.1), ts 50543388569, free_ts
21285403579
prep_new_page+0x2c6/0x350
get_page_from_freelist+0xae9/0x3a80
__alloc_pages+0x321/0x710
cache_grow_begin+0x75/0x360
kmem_cache_alloc_lru+0xe72/0xfb0
fat_alloc_inode+0x23/0x1e0
alloc_inode+0x61/0x1e0
new_inode_pseudo+0x13/0x80
new_inode+0x1b/0x40
fat_fill_super+0x1c37/0x3710
mount_bdev+0x34d/0x410
legacy_get_tree+0x105/0x220
vfs_get_tree+0x89/0x2f0
path_mount+0x121b/0x1cb0
do_mount+0xf3/0x110
__x64_sys_mount+0x18f/0x230
page last free stack trace:
free_pcp_prepare+0x5ab/0xd00
free_unref_page+0x19/0x410
slab_destroy+0x14/0x50
slabs_destroy+0x6a/0x90
___cache_free+0x1e3/0x3b0
qlist_free_all+0x51/0x1c0
kasan_quarantine_reduce+0x13d/0x180
__kasan_slab_alloc+0x97/0xb0
kmem_cache_alloc+0x204/0xcc0
getname_flags+0xd2/0x5b0
vfs_fstatat+0x73/0xb0
__do_sys_newlstat+0x8b/0x110
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Memory state around the buggy address:
ffff8880273c4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880273c4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880273c4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880273c4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880273c4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
On Tue 21-02-23 21:09:23, Palash Oswal wrote:
> Hello,
> I found the following issue using syzkaller on:
> HEAD commit : e60276b8c11ab4a8be23807bc67b04
> 8cfb937dfa (v6.0.8)
> git tree: stable
>
> C Reproducer : https://gist.github.com/oswalpalash/bed0eba75def3cdd34a285428e9bcdc4
> Kernel .config :
> https://gist.github.com/oswalpalash/0962c70d774e5ec736a047bba917cecb
>
> Console log :
>
> ==================================================================
> BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110
> Read of size 8 at addr ffff8880273c4358 by task syz-executor.1/6475
OK, so FAT inode was on writeback list (through inode->i_io_list) when
being freed. This should be fixed by commit 4e3c51f4e805 ("fs: do not
update freeing inode i_io_list"). Can you check please?
Honza
>
> CPU: 0 PID: 6475 Comm: syz-executor.1 Not tainted 6.0.8-pasta #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.13.0-1ubuntu1.1 04/01/2014
> Call Trace:
> <TASK>
> dump_stack_lvl+0xcd/0x134
> print_report.cold+0xe5/0x63a
> kasan_report+0x8a/0x1b0
> __list_del_entry_valid+0xf2/0x110
> inode_cgwb_move_to_attached+0x2ee/0x4e0
> writeback_single_inode+0x3fa/0x510
> write_inode_now+0x16a/0x1e0
> blkdev_flush_mapping+0x168/0x220
> blkdev_put_whole+0xd1/0xf0
> blkdev_put+0x29b/0x700
> deactivate_locked_super+0x8c/0xf0
> deactivate_super+0xad/0xd0
> cleanup_mnt+0x347/0x4b0
> task_work_run+0xe0/0x1a0
> exit_to_user_mode_prepare+0x25d/0x270
> syscall_exit_to_user_mode+0x19/0x50
> do_syscall_64+0x42/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f22bd29143b
> Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6
> e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 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:00007ffe505103b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f22bd29143b
> RDX: 00007f22bd228a90 RSI: 000000000000000a RDI: 00007ffe50510480
> RBP: 00007ffe50510480 R08: 00007f22bd2fba1f R09: 00007ffe50510240
> R10: 00000000fffffffb R11: 0000000000000246 R12: 00007f22bd2fb9f8
> R13: 00007ffe50511520 R14: 0000555556f4bd90 R15: 0000000000000032
> </TASK>
>
> Allocated by task 7810:
> kasan_save_stack+0x1e/0x40
> __kasan_slab_alloc+0x85/0xb0
> kmem_cache_alloc_lru+0x25b/0xfb0
> fat_alloc_inode+0x23/0x1e0
> alloc_inode+0x61/0x1e0
> new_inode_pseudo+0x13/0x80
> new_inode+0x1b/0x40
> fat_build_inode+0x146/0x2d0
> vfat_create+0x249/0x390
> lookup_open+0x10bc/0x1640
> path_openat+0xa42/0x2840
> do_filp_open+0x1ca/0x2a0
> do_sys_openat2+0x61b/0x990
> do_sys_open+0xc3/0x140
> do_syscall_64+0x35/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Freed by task 16:
> kasan_save_stack+0x1e/0x40
> kasan_set_track+0x21/0x30
> kasan_set_free_info+0x20/0x30
> __kasan_slab_free+0xf5/0x180
> kmem_cache_free.part.0+0xfc/0x4a0
> i_callback+0x3f/0x70
> rcu_core+0x785/0x1720
> __do_softirq+0x1d0/0x908
>
> Last potentially related work creation:
> kasan_save_stack+0x1e/0x40
> __kasan_record_aux_stack+0x7e/0x90
> call_rcu+0x99/0x740
> destroy_inode+0x129/0x1b0
> iput.part.0+0x5cd/0x800
> iput+0x58/0x70
> dentry_unlink_inode+0x2e2/0x4a0
> __dentry_kill+0x374/0x5e0
> dput+0x656/0xbe0
> __fput+0x3cc/0xa90
> task_work_run+0xe0/0x1a0
> exit_to_user_mode_prepare+0x25d/0x270
> syscall_exit_to_user_mode+0x19/0x50
> do_syscall_64+0x42/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> The buggy address belongs to the object at ffff8880273c4080
> which belongs to the cache fat_inode_cache of size 1488
> The buggy address is located 728 bytes inside of
> 1488-byte region [ffff8880273c4080, ffff8880273c4650)
>
> The buggy address belongs to the physical page:
> page:ffffea00009cf100 refcount:1 mapcount:0 mapping:0000000000000000
> index:0xffff8880273c4ffe pfn:0x273c4
> flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
> raw: 00fff00000000200 ffffea00009cf0c8 ffff88801820e450 ffff888103e00e00
> raw: ffff8880273c4ffe ffff8880273c4080 0000000100000002 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 0, migratetype Reclaimable, gfp_mask
> 0x242050(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE|__GFP_RECLAIMABLE),
> pid 7810, tgid 7808 (syz-executor.1), ts 50543388569, free_ts
> 21285403579
> prep_new_page+0x2c6/0x350
> get_page_from_freelist+0xae9/0x3a80
> __alloc_pages+0x321/0x710
> cache_grow_begin+0x75/0x360
> kmem_cache_alloc_lru+0xe72/0xfb0
> fat_alloc_inode+0x23/0x1e0
> alloc_inode+0x61/0x1e0
> new_inode_pseudo+0x13/0x80
> new_inode+0x1b/0x40
> fat_fill_super+0x1c37/0x3710
> mount_bdev+0x34d/0x410
> legacy_get_tree+0x105/0x220
> vfs_get_tree+0x89/0x2f0
> path_mount+0x121b/0x1cb0
> do_mount+0xf3/0x110
> __x64_sys_mount+0x18f/0x230
> page last free stack trace:
> free_pcp_prepare+0x5ab/0xd00
> free_unref_page+0x19/0x410
> slab_destroy+0x14/0x50
> slabs_destroy+0x6a/0x90
> ___cache_free+0x1e3/0x3b0
> qlist_free_all+0x51/0x1c0
> kasan_quarantine_reduce+0x13d/0x180
> __kasan_slab_alloc+0x97/0xb0
> kmem_cache_alloc+0x204/0xcc0
> getname_flags+0xd2/0x5b0
> vfs_fstatat+0x73/0xb0
> __do_sys_newlstat+0x8b/0x110
> do_syscall_64+0x35/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Memory state around the buggy address:
> ffff8880273c4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8880273c4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff8880273c4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff8880273c4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8880273c4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
--
Jan Kara <[email protected]>
SUSE Labs, CR
On Tue, Feb 28, 2023 at 4:45 AM Jan Kara <[email protected]> wrote:
>
> On Tue 21-02-23 21:09:23, Palash Oswal wrote:
> > Hello,
> > I found the following issue using syzkaller on:
> > HEAD commit : e60276b8c11ab4a8be23807bc67b04
> > 8cfb937dfa (v6.0.8)
> > git tree: stable
> >
> > C Reproducer : https://gist.github.com/oswalpalash/bed0eba75def3cdd34a285428e9bcdc4
> > Kernel .config :
> > https://gist.github.com/oswalpalash/0962c70d774e5ec736a047bba917cecb
> >
> > Console log :
> >
> > ==================================================================
> > BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110
> > Read of size 8 at addr ffff8880273c4358 by task syz-executor.1/6475
>
> OK, so FAT inode was on writeback list (through inode->i_io_list) when
> being freed. This should be fixed by commit 4e3c51f4e805 ("fs: do not
> update freeing inode i_io_list"). Can you check please?
>
> Honza
>
I have verified that the commit fixes the bug. Tested against v6.0.11
on the stable tree.
Thanks
> >
> > CPU: 0 PID: 6475 Comm: syz-executor.1 Not tainted 6.0.8-pasta #2
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > 1.13.0-1ubuntu1.1 04/01/2014
> > Call Trace:
> > <TASK>
> > dump_stack_lvl+0xcd/0x134
> > print_report.cold+0xe5/0x63a
> > kasan_report+0x8a/0x1b0
> > __list_del_entry_valid+0xf2/0x110
> > inode_cgwb_move_to_attached+0x2ee/0x4e0
> > writeback_single_inode+0x3fa/0x510
> > write_inode_now+0x16a/0x1e0
> > blkdev_flush_mapping+0x168/0x220
> > blkdev_put_whole+0xd1/0xf0
> > blkdev_put+0x29b/0x700
> > deactivate_locked_super+0x8c/0xf0
> > deactivate_super+0xad/0xd0
> > cleanup_mnt+0x347/0x4b0
> > task_work_run+0xe0/0x1a0
> > exit_to_user_mode_prepare+0x25d/0x270
> > syscall_exit_to_user_mode+0x19/0x50
> > do_syscall_64+0x42/0xb0
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> > RIP: 0033:0x7f22bd29143b
> > Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6
> > e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 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:00007ffe505103b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
> > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f22bd29143b
> > RDX: 00007f22bd228a90 RSI: 000000000000000a RDI: 00007ffe50510480
> > RBP: 00007ffe50510480 R08: 00007f22bd2fba1f R09: 00007ffe50510240
> > R10: 00000000fffffffb R11: 0000000000000246 R12: 00007f22bd2fb9f8
> > R13: 00007ffe50511520 R14: 0000555556f4bd90 R15: 0000000000000032
> > </TASK>
> >
> > Allocated by task 7810:
> > kasan_save_stack+0x1e/0x40
> > __kasan_slab_alloc+0x85/0xb0
> > kmem_cache_alloc_lru+0x25b/0xfb0
> > fat_alloc_inode+0x23/0x1e0
> > alloc_inode+0x61/0x1e0
> > new_inode_pseudo+0x13/0x80
> > new_inode+0x1b/0x40
> > fat_build_inode+0x146/0x2d0
> > vfat_create+0x249/0x390
> > lookup_open+0x10bc/0x1640
> > path_openat+0xa42/0x2840
> > do_filp_open+0x1ca/0x2a0
> > do_sys_openat2+0x61b/0x990
> > do_sys_open+0xc3/0x140
> > do_syscall_64+0x35/0xb0
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > Freed by task 16:
> > kasan_save_stack+0x1e/0x40
> > kasan_set_track+0x21/0x30
> > kasan_set_free_info+0x20/0x30
> > __kasan_slab_free+0xf5/0x180
> > kmem_cache_free.part.0+0xfc/0x4a0
> > i_callback+0x3f/0x70
> > rcu_core+0x785/0x1720
> > __do_softirq+0x1d0/0x908
> >
> > Last potentially related work creation:
> > kasan_save_stack+0x1e/0x40
> > __kasan_record_aux_stack+0x7e/0x90
> > call_rcu+0x99/0x740
> > destroy_inode+0x129/0x1b0
> > iput.part.0+0x5cd/0x800
> > iput+0x58/0x70
> > dentry_unlink_inode+0x2e2/0x4a0
> > __dentry_kill+0x374/0x5e0
> > dput+0x656/0xbe0
> > __fput+0x3cc/0xa90
> > task_work_run+0xe0/0x1a0
> > exit_to_user_mode_prepare+0x25d/0x270
> > syscall_exit_to_user_mode+0x19/0x50
> > do_syscall_64+0x42/0xb0
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > The buggy address belongs to the object at ffff8880273c4080
> > which belongs to the cache fat_inode_cache of size 1488
> > The buggy address is located 728 bytes inside of
> > 1488-byte region [ffff8880273c4080, ffff8880273c4650)
> >
> > The buggy address belongs to the physical page:
> > page:ffffea00009cf100 refcount:1 mapcount:0 mapping:0000000000000000
> > index:0xffff8880273c4ffe pfn:0x273c4
> > flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
> > raw: 00fff00000000200 ffffea00009cf0c8 ffff88801820e450 ffff888103e00e00
> > raw: ffff8880273c4ffe ffff8880273c4080 0000000100000002 0000000000000000
> > page dumped because: kasan: bad access detected
> > page_owner tracks the page as allocated
> > page last allocated via order 0, migratetype Reclaimable, gfp_mask
> > 0x242050(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE|__GFP_RECLAIMABLE),
> > pid 7810, tgid 7808 (syz-executor.1), ts 50543388569, free_ts
> > 21285403579
> > prep_new_page+0x2c6/0x350
> > get_page_from_freelist+0xae9/0x3a80
> > __alloc_pages+0x321/0x710
> > cache_grow_begin+0x75/0x360
> > kmem_cache_alloc_lru+0xe72/0xfb0
> > fat_alloc_inode+0x23/0x1e0
> > alloc_inode+0x61/0x1e0
> > new_inode_pseudo+0x13/0x80
> > new_inode+0x1b/0x40
> > fat_fill_super+0x1c37/0x3710
> > mount_bdev+0x34d/0x410
> > legacy_get_tree+0x105/0x220
> > vfs_get_tree+0x89/0x2f0
> > path_mount+0x121b/0x1cb0
> > do_mount+0xf3/0x110
> > __x64_sys_mount+0x18f/0x230
> > page last free stack trace:
> > free_pcp_prepare+0x5ab/0xd00
> > free_unref_page+0x19/0x410
> > slab_destroy+0x14/0x50
> > slabs_destroy+0x6a/0x90
> > ___cache_free+0x1e3/0x3b0
> > qlist_free_all+0x51/0x1c0
> > kasan_quarantine_reduce+0x13d/0x180
> > __kasan_slab_alloc+0x97/0xb0
> > kmem_cache_alloc+0x204/0xcc0
> > getname_flags+0xd2/0x5b0
> > vfs_fstatat+0x73/0xb0
> > __do_sys_newlstat+0x8b/0x110
> > do_syscall_64+0x35/0xb0
> > entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > Memory state around the buggy address:
> > ffff8880273c4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff8880273c4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > >ffff8880273c4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ^
> > ffff8880273c4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff8880273c4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ==================================================================
> --
> Jan Kara <[email protected]>
> SUSE Labs, CR
On Tue 28-02-23 22:33:32, Palash Oswal wrote:
> On Tue, Feb 28, 2023 at 4:45 AM Jan Kara <[email protected]> wrote:
> >
> > On Tue 21-02-23 21:09:23, Palash Oswal wrote:
> > > Hello,
> > > I found the following issue using syzkaller on:
> > > HEAD commit : e60276b8c11ab4a8be23807bc67b04
> > > 8cfb937dfa (v6.0.8)
> > > git tree: stable
> > >
> > > C Reproducer : https://gist.github.com/oswalpalash/bed0eba75def3cdd34a285428e9bcdc4
> > > Kernel .config :
> > > https://gist.github.com/oswalpalash/0962c70d774e5ec736a047bba917cecb
> > >
> > > Console log :
> > >
> > > ==================================================================
> > > BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110
> > > Read of size 8 at addr ffff8880273c4358 by task syz-executor.1/6475
> >
> > OK, so FAT inode was on writeback list (through inode->i_io_list) when
> > being freed. This should be fixed by commit 4e3c51f4e805 ("fs: do not
> > update freeing inode i_io_list"). Can you check please?
> >
> > Honza
> >
>
> I have verified that the commit fixes the bug. Tested against v6.0.11
> on the stable tree.
Thanks for testing!
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR