Node 0 DMA: 3*4kB (UM) 38*8kB (UH) 31*16kB (UMEH) 16*32kB (UMH) 3*64kB (UME) 2*128kB (EH) 2*256kB (UM) 2*512kB (UE) 3*1024kB (UME) 2*2048kB (ME) 0*4096kB = 10476kB
0 pages cma reserved
Node 0 DMA32: 287*4kB (UME) 724*8kB (UME) 819*16kB (UME) 171*32kB (UME) 22*64kB (ME) 15*128kB (ME) 2*256kB (ME) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 29356kB
==================================================================
BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283
Read of size 8 at addr ffff8880a68f3910 by task syz-executor.4/1512
CPU: 0 PID: 1512 Comm: syz-executor.4 Not tainted 4.14.150 #0
Node 0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x197 lib/dump_stack.c:53
Normal:
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
0*4kB
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
0*8kB
ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283
ceph_mount+0xb6d/0x1709 fs/ceph/super.c:1009
0*16kB
mount_fs+0x97/0x2a1 fs/super.c:1237
0*32kB
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
0*64kB 0*128kB 0*256kB 0*512kB
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
0*1024kB
0*2048kB 0*4096kB
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
= 0kB
Node 1
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459f39
Normal:
RSP: 002b:00007f5520527c78 EFLAGS: 00000246
1140*4kB
ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459f39
RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040
(UMEH)
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f55205286d4
514*8kB
R13: 00000000004c6992 R14: 00000000004dbc90 R15: 00000000ffffffff
Allocated by task 1512:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
(UME)
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
129*16kB
kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618
kmalloc include/linux/slab.h:488 [inline]
kzalloc include/linux/slab.h:661 [inline]
ceph_parse_options+0xb8/0xe80 net/ceph/ceph_common.c:349
(UME)
parse_mount_options fs/ceph/super.c:466 [inline]
ceph_mount+0x3c1/0x1709 fs/ceph/super.c:998
mount_fs+0x97/0x2a1 fs/super.c:1237
483*32kB
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 1512:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
(UMEH)
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
326*64kB
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
ceph_destroy_options+0xdc/0x110 net/ceph/ceph_common.c:289
(UME) 74*128kB
ceph_destroy_client+0x9d/0xc0 net/ceph/ceph_common.c:671
create_fs_client fs/ceph/super.c:649 [inline]
ceph_mount+0xb46/0x1709 fs/ceph/super.c:1005
mount_fs+0x97/0x2a1 fs/super.c:1237
vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0x417/0x27d0 fs/namespace.c:2879
(M)
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xab/0x120 fs/namespace.c:3072
0*256kB
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
0*512kB
0*1024kB
The buggy address belongs to the object at ffff8880a68f3840
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
256-byte region [ffff8880a68f3840, ffff8880a68f3940)
The buggy address belongs to the page:
page:ffffea00029a3cc0 count:1 mapcount:0 mapping:ffff8880a68f30c0 index:0x0
0*2048kB 0*4096kB
flags: 0x1fffc0000000100(slab)
= 56528kB
raw: 01fffc0000000100 ffff8880a68f30c0 0000000000000000 000000010000000c
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
raw: ffffea00024ee1a0 ffffea00029804a0 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a68f3800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff8880a68f3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
>ffff8880a68f3900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
^
ffff8880a68f3980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
ffff8880a68f3a00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
==================================================================