KASAN: use-after-free Read in ceph_destroy

Title	Replies (including bot)	Last reply
[PATCH 4.18 000/168] 4.18.13-stable review	180 (180)	2018/10/10 05:52
[PATCH AUTOSEL 4.18 01/76] mac80211: Run TXQ teardown code before de-registering interfaces	75 (75)	2018/09/24 14:48
KASAN: use-after-free Read in ceph_destroy_options	1 (2)	2018/08/23 19:06

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: use-after-free Read in ceph_destroy_options	syz		error	55	1356d	2099d	0/1	upstream: reported syz repro on 2019/04/30 23:53

linux-4.14

KASAN: use-after-free Read in ceph_destroy_options

syz

error

1356d

2099d

0/1

upstream: reported syz repro on 2019/04/30 23:53

================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xe0/0x110 net/ceph/ceph_common.c:289 Read of size 8 at addr ffff8801d8f4dd50 by task syz-executor2/7977 CPU: 0 PID: 7977 Comm: syz-executor2 Not tainted 4.18.0-next-20180822+ #45 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ceph_destroy_options+0xe0/0x110 net/ceph/ceph_common.c:289 ceph_mount+0xeab/0x1cc0 fs/ceph/super.c:1047 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fae7dd45c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fae7dd466d4 RCX: 0000000000457089 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 00000000009300a0 R08: 00000000200000c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d2750 R14: 00000000004c7bdf R15: 0000000000000000 Allocated by task 7977: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x730 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] ceph_parse_options+0xfe/0x1230 net/ceph/ceph_common.c:355 parse_mount_options fs/ceph/super.c:491 [inline] ceph_mount+0x4b9/0x1cc0 fs/ceph/super.c:1036 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7977: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x210 mm/slab.c:3813 ceph_destroy_options+0xd4/0x110 net/ceph/ceph_common.c:295 ceph_destroy_client+0x139/0x1a0 net/ceph/ceph_common.c:680 create_fs_client fs/ceph/super.c:677 [inline] ceph_mount+0xf6e/0x1cc0 fs/ceph/super.c:1043 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d8f4dc80 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff8801d8f4dc80, ffff8801d8f4dd80) The buggy address belongs to the page: page:ffffea000763d340 count:1 mapcount:0 mapping:ffff8801dac007c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006c0e448 ffffea00072ca688 ffff8801dac007c0 raw: 0000000000000000 ffff8801d8f4d000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d8f4dc00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d8f4dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d8f4dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d8f4dd80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801d8f4de00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================