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: 123d, last: 14d

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 ffff888018df9198 by task syz-executor.1/10856

CPU: 0 PID: 10856 Comm: syz-executor.1 Not tainted 5.14.0-rc2-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+0x1ae/0x29f lib/dump_stack.c:105
 print_address_description+0x66/0x3b0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x163/0x210 mm/kasan/report.c:436
 reiserfs_xattr_get+0xdf/0x970 fs/reiserfs/xattr.c:681
 reiserfs_get_acl+0x63/0x670 fs/reiserfs/xattr_acl.c:211
 get_acl+0x152/0x2e0 fs/posix_acl.c:141
 check_acl fs/namei.c:294 [inline]
 acl_permission_check fs/namei.c:339 [inline]
 generic_permission+0x2e8/0x5a0 fs/namei.c:392
 do_inode_permission fs/namei.c:446 [inline]
 inode_permission+0x28e/0x500 fs/namei.c:513
 may_open+0x228/0x3e0 fs/namei.c:2995
 do_open fs/namei.c:3372 [inline]
 path_openat+0x2666/0x36b0 fs/namei.c:3507
 do_filp_open+0x253/0x4d0 fs/namei.c:3534
 do_sys_openat2+0x124/0x460 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_openat fs/open.c:1236 [inline]
 __se_sys_openat fs/open.c:1231 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4196d4
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:00007faeb9ab8f30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004196d4
RDX: 0000000000010000 RSI: 0000000020000100 RDI: 00000000ffffff9c
RBP: 0000000020000100 R08: 0000000000000000 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000010000
R13: 0000000020000100 R14: 00007faeb9ab9000 R15: 0000000020061000

Allocated by task 8439:
 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+0xc4/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0xb4/0x390 mm/slub.c:4104
 kmalloc include/linux/slab.h:596 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 new_dir fs/proc/proc_sysctl.c:953 [inline]
 get_subdir fs/proc/proc_sysctl.c:998 [inline]
 __register_sysctl_table+0xa32/0x12a0 fs/proc/proc_sysctl.c:1347
 mpls_dev_sysctl_register+0x20a/0x2b0 net/mpls/af_mpls.c:1421
 mpls_add_dev net/mpls/af_mpls.c:1472 [inline]
 mpls_dev_notify+0x2f0/0x7d0 net/mpls/af_mpls.c:1588
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2122 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2134 [inline]
 call_netdevice_notifiers net/core/dev.c:2148 [inline]
 register_netdevice+0x160e/0x1c20 net/core/dev.c:10362
 xfrmi_create net/xfrm/xfrm_interface.c:156 [inline]
 xfrmi_newlink+0x2bb/0x430 net/xfrm/xfrm_interface.c:654
 __rtnl_newlink net/core/rtnetlink.c:3460 [inline]
 rtnl_newlink+0x13f6/0x1cd0 net/core/rtnetlink.c:3508
 rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg net/socket.c:723 [inline]
 __sys_sendto+0x541/0x720 net/socket.c:2019
 __do_sys_sendto net/socket.c:2031 [inline]
 __se_sys_sendto net/socket.c:2027 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2027
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888018df9000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 152 bytes to the right of
 256-byte region [ffff888018df9000, ffff888018df9100)
The buggy address belongs to the page:
page:ffffea0000637e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18df8
head:ffffea0000637e00 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000092ac00 0000000300000003 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 2975758927, free_ts 0
 prep_new_page mm/page_alloc.c:2433 [inline]
 get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4166
 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5388
 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2119
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0xf1/0x540 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x1cf/0x350 mm/slub.c:2800
 __slab_alloc mm/slub.c:2840 [inline]
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 __kmalloc_track_caller+0x2e5/0x390 mm/slub.c:4617
 __do_krealloc mm/slab_common.c:1206 [inline]
 krealloc+0x5c/0xf0 mm/slab_common.c:1239
 add_sysfs_param+0xc8/0x7f0 kernel/params.c:633
 kernel_add_sysfs_param+0xb0/0x126 kernel/params.c:794
 param_sysfs_builtin+0x145/0x1b9 kernel/params.c:833
 param_sysfs_init+0x68/0x6c kernel/params.c:952
 do_one_initcall+0x197/0x3f0 init/main.c:1282
 do_initcall_level+0x14a/0x1f5 init/main.c:1355
 do_initcalls+0x4b/0x8c init/main.c:1371
 kernel_init_freeable+0x3f1/0x57e init/main.c:1593
 kernel_init+0x19/0x2a0 init/main.c:1485
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888018df9080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06
 ffff888018df9100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888018df9180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888018df9200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888018df9280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (8):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
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	2021/07/08 03:29	upstream	3dbdb38e2869	95793bce	.config	log	report	info	KASAN: use-after-free Read in reiserfs_xattr_get