1965979 pages RAM 0 pages HighMem/MovableOnly 339048 pages reserved 0 pages cma reserved ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff888078636c90 by task syz-executor.4/13580 CPU: 0 PID: 13580 Comm: syz-executor.4 Not tainted 4.14.171-syzkaller #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+0x13e/0x194 lib/dump_stack.c:58 kdevtmpfs invoked oom-killer: gfp_mask=0x14040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null) print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 , order=1, oom_score_adj=0 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 ceph_mount+0xb6c/0x15d8 fs/ceph/super.c:1018 mount_fs+0x92/0x2a0 fs/super.c:1237 kdevtmpfs cpuset= vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c449 RSP: 002b:00007f62e7946c78 EFLAGS: 00000246 / ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f62e79476d4 RCX: 000000000045c449 RDX: 0000000020000140 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000074a R14: 00000000004c9d14 R15: 000000000076bf2c mems_allowed=0-1 CPU: 1 PID: 20 Comm: kdevtmpfs Not tainted 4.14.171-syzkaller #0 Allocated by task 13580: Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 Call Trace: set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x14d/0x7b0 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 parse_mount_options fs/ceph/super.c:475 [inline] ceph_mount+0x39f/0x15d8 fs/ceph/super.c:1007 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 dump_header+0x178/0x6d4 mm/oom_kill.c:422 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 13580: oom_kill_process.cold+0x10/0xae3 mm/oom_kill.c:861 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 out_of_memory mm/oom_kill.c:1084 [inline] out_of_memory+0x2d5/0x1110 mm/oom_kill.c:1023 ceph_destroy_client+0x90/0xb0 net/ceph/ceph_common.c:671 create_fs_client fs/ceph/super.c:658 [inline] ceph_mount+0xb45/0x15d8 fs/ceph/super.c:1014 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 __alloc_pages_may_oom mm/page_alloc.c:3344 [inline] __alloc_pages_slowpath+0x1fbf/0x26c0 mm/page_alloc.c:4033 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 __alloc_pages_nodemask+0x5d3/0x700 mm/page_alloc.c:4198 The buggy address belongs to the object at ffff888078636bc0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff888078636bc0, ffff888078636cc0) The buggy address belongs to the page: page:ffffea0001e18d80 count:1 mapcount:0 mapping:ffff888078636080 index:0x0 __alloc_pages include/linux/gfp.h:484 [inline] __alloc_pages_node include/linux/gfp.h:497 [inline] kmem_getpages mm/slab.c:1419 [inline] cache_grow_begin+0x7b/0x410 mm/slab.c:2676 flags: 0xfffe0000000100(slab) fallback_alloc+0x205/0x2b0 mm/slab.c:3217 raw: 00fffe0000000100 ffff888078636080 0000000000000000 000000010000000c __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3382 [inline] kmem_cache_alloc+0x1ea/0x770 mm/slab.c:3550 raw: ffffea00026c0920 ffffea00028353a0 ffff88812fe567c0 0000000000000000 page dumped because: kasan: bad access detected getname_kernel+0x4e/0x340 fs/namei.c:218 kern_path_locked+0x64/0x2b0 fs/namei.c:2445 Memory state around the buggy address: ffff888078636b80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888078636c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888078636c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc handle_remove+0x95/0x670 drivers/base/devtmpfs.c:306 ^ ffff888078636d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078636d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================