KASAN: slab-out-of-bounds Read in reiserfs_xattr

KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
Status: upstream: reported on 2021/04/13 05:55
Reported-by: syzbot+72ba979b6681c3369db4@syzkaller.appspotmail.com
First crash: 238d, last: 27d

Sample crash report:

==================================================================
BUG: KASAN: slab-out-of-bounds in reiserfs_xattr_get+0xdf/0x970 fs/reiserfs/xattr.c:681
Read of size 8 at addr ffff888022ba3798 by task syz-executor.2/21495

CPU: 1 PID: 21495 Comm: syz-executor.2 Not tainted 5.15.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 print_address_description+0x66/0x3e0 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report+0x19a/0x1f0 mm/kasan/report.c:459
 reiserfs_xattr_get+0xdf/0x970 fs/reiserfs/xattr.c:681
 reiserfs_get_acl+0x7b/0x690 fs/reiserfs/xattr_acl.c:214
 get_acl+0x154/0x2e0 fs/posix_acl.c:152
 check_acl fs/namei.c:305 [inline]
 acl_permission_check fs/namei.c:350 [inline]
 generic_permission+0x2e8/0x5a0 fs/namei.c:403
 do_inode_permission fs/namei.c:457 [inline]
 inode_permission+0x28e/0x500 fs/namei.c:524
 may_open+0x228/0x3e0 fs/namei.c:3051
 do_open fs/namei.c:3426 [inline]
 path_openat+0x2736/0x3670 fs/namei.c:3561
 do_filp_open+0x277/0x4f0 fs/namei.c:3588
 do_sys_openat2+0x13b/0x500 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_openat fs/open.c:1232 [inline]
 __se_sys_openat fs/open.c:1227 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1227
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f18f1f50a04
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44
RSP: 002b:00007f18ef512f30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f18f1f50a04
RDX: 0000000000010000 RSI: 0000000020000100 RDI: 00000000ffffff9c
RBP: 0000000020000100 R08: 0000000000000000 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000010000
R13: 0000000020000100 R14: 00007f18ef513000 R15: 0000000020065600

Allocated by task 32155:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_trace+0x9f/0x310 mm/slub.c:3240
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 smk_fetch security/smack/smack_lsm.c:288 [inline]
 smack_d_instantiate+0x9f1/0xd10 security/smack/smack_lsm.c:3451
 security_d_instantiate+0xa5/0x100 security/security.c:2039
 d_instantiate+0x51/0x90 fs/dcache.c:2008
 shmem_mknod+0x165/0x1b0 mm/shmem.c:2841
 lookup_open fs/namei.c:3282 [inline]
 open_last_lookups fs/namei.c:3352 [inline]
 path_openat+0x1397/0x3670 fs/namei.c:3558
 do_filp_open+0x277/0x4f0 fs/namei.c:3588
 do_sys_openat2+0x13b/0x500 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_open fs/open.c:1224 [inline]
 __se_sys_open fs/open.c:1220 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1220
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xf1/0x130 mm/kasan/generic.c:348
 kvfree_call_rcu+0x11b/0x880 kernel/rcu/tree.c:3552
 drop_sysctl_table+0x2cd/0x400 fs/proc/proc_sysctl.c:1647
 drop_sysctl_table+0x2eb/0x400 fs/proc/proc_sysctl.c:1650
 unregister_sysctl_table+0x88/0x130 fs/proc/proc_sysctl.c:1685
 __devinet_sysctl_unregister net/ipv4/devinet.c:2600 [inline]
 devinet_sysctl_unregister net/ipv4/devinet.c:2628 [inline]
 inetdev_destroy net/ipv4/devinet.c:324 [inline]
 inetdev_event+0x71d/0x1410 net/ipv4/devinet.c:1598
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:391
 call_netdevice_notifiers_info net/core/dev.c:1996 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 unregister_netdevice_many+0xfae/0x19e0 net/core/dev.c:11050
 default_device_exit_batch+0x44b/0x4b0 net/core/dev.c:11580
 ops_exit_list net/core/net_namespace.c:171 [inline]
 cleanup_net+0x7ec/0xc50 net/core/net_namespace.c:591
 process_one_work+0x853/0x1140 kernel/workqueue.c:2297
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

The buggy address belongs to the object at ffff888022ba3600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 152 bytes to the right of
 256-byte region [ffff888022ba3600, ffff888022ba3700)
The buggy address belongs to the page:
page:ffffea00008ae880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22ba2
head:ffffea00008ae880 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000712280 0000000700000007 ffff888011041b40
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 22, ts 9825804176, free_ts 0
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4155
 __alloc_pages+0x255/0x580 mm/page_alloc.c:5381
 alloc_slab_page mm/slub.c:1770 [inline]
 allocate_slab+0xcc/0x4d0 mm/slub.c:1907
 new_slab mm/slub.c:1970 [inline]
 ___slab_alloc+0x41e/0xc40 mm/slub.c:3001
 __slab_alloc mm/slub.c:3088 [inline]
 slab_alloc_node mm/slub.c:3179 [inline]
 slab_alloc mm/slub.c:3221 [inline]
 kmem_cache_alloc_trace+0x28a/0x310 mm/slub.c:3238
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 smk_fetch security/smack/smack_lsm.c:288 [inline]
 smack_d_instantiate+0x65d/0xd10 security/smack/smack_lsm.c:3408
 security_d_instantiate+0xa5/0x100 security/security.c:2039
 d_instantiate+0x51/0x90 fs/dcache.c:2008
 shmem_mknod+0x165/0x1b0 mm/shmem.c:2841
 vfs_mknod+0x4f5/0x710 fs/namei.c:3763
 handle_create drivers/base/devtmpfs.c:215 [inline]
 handle drivers/base/devtmpfs.c:380 [inline]
 devtmpfs_work_loop+0x921/0x1080 drivers/base/devtmpfs.c:395
 devtmpfsd+0x44/0x50 drivers/base/devtmpfs.c:437
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888022ba3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022ba3700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888022ba3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888022ba3800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022ba3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (18):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/10/31 11:28	upstream	180eca540ae0	098b5d53	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/10/25 07:20	upstream	87066fdd2e30	4f0000ee	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/10/05 17:04	upstream	f6274b06e326	0a63fd36	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/10/01 07:01	upstream	4de593fb965f	1d849ab4	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/09/06 15:42	upstream	0319b848b155	6ca60148	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/08/22 19:53	upstream	1bdc3d5be7e1	b599f2fc	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/08/19 06:17	upstream	d6d09a694205	a2fe1cb5	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/08/16 13:35	upstream	7c60610d4767	33c26cb7	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/08/10 11:25	upstream	9a73fa375d58	6972b106	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/07/22 15:03	upstream	3d5895cd3517	302e51de	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/06/12 00:27	upstream	f21b807c3cf8	1ba81399	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/06/06 10:51	upstream	f5b6eb1e0182	500c2339	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/05/30 17:06	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/04/14 01:33	upstream	eebe426d32e1	a184b83e	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/04/08 01:29	upstream	3a22981230f9	6a81331a	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/04/03 19:38	upstream	57fbdb15ec42	6a81331a	.config	log	report	info	KASAN: slab-out-of-bounds Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/10/03 23:44	upstream	9e1ff307c779	db0f5787	.config	log	report	info	KASAN: use-after-free Read in reiserfs_xattr_get
ci-upstream-kasan-gce-smack-root	2021/07/08 03:29	upstream	3dbdb38e2869	95793bce	.config	log	report	info	KASAN: use-after-free Read in reiserfs_xattr_get