1965979 pages RAM 0 pages HighMem/MovableOnly 338455 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 ffff88809537f550 by task syz-executor.0/25955 CPU: 0 PID: 25955 Comm: syz-executor.0 Not tainted 4.14.183-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+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2b9 mm/kasan/report.c:393 ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 ceph_mount+0xd43/0x181c fs/ceph/super.c:1036 mount_fs+0x92/0x2a0 fs/super.c:1237 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+0x3c9/0x25e0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 syz-executor.0: do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca69 page allocation failure: order:5 RSP: 002b:00007f2f448f3c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f62c0 RCX: 000000000045ca69 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3ea R15: 00007f2f448f46d4 , mode:0x14040c0(GFP_KERNEL|__GFP_COMP), nodemask= Allocated by task 25955: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551 (null) kmem_cache_alloc_trace+0x14d/0x3f0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] ceph_parse_options+0xb8/0xe50 net/ceph/ceph_common.c:349 parse_mount_options fs/ceph/super.c:501 [inline] ceph_mount+0x44f/0x181c fs/ceph/super.c:1025 syz-executor.0 cpuset= mount_fs+0x92/0x2a0 fs/super.c:1237 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+0x3c9/0x25e0 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+0x46/0xbb Freed by task 25955: mems_allowed=0-1 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xaf/0x190 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 ceph_destroy_client+0x90/0xb0 net/ceph/ceph_common.c:671 create_fs_client fs/ceph/super.c:684 [inline] ceph_mount+0xd1c/0x181c fs/ceph/super.c:1032 CPU: 1 PID: 25963 Comm: syz-executor.0 Not tainted 4.14.183-syzkaller #0 mount_fs+0x92/0x2a0 fs/super.c:1237 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 Call Trace: vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 fs/namespace.c:2879 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 warn_alloc.cold+0x96/0x1af mm/page_alloc.c:3249 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88809537f480 which belongs to the cache kmalloc-256 of size 256 __alloc_pages_slowpath mm/page_alloc.c:4096 [inline] __alloc_pages_nodemask+0x2129/0x2730 mm/page_alloc.c:4199 The buggy address is located 208 bytes inside of 256-byte region [ffff88809537f480, ffff88809537f580) The buggy address belongs to the page: page:ffffea000254dfc0 count:1 mapcount:0 mapping:ffff88809537f0c0 index:0xffff88809537f200 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88809537f0c0 ffff88809537f200 000000010000000a raw: ffffea00028286e0 ffffea00027f8220 ffff8880aa8007c0 0000000000000000 page dumped because: kasan: bad access detected __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+0x91/0x410 mm/slab.c:2676 Memory state around the buggy address: fallback_alloc+0x205/0x2b0 mm/slab.c:3217 ffff88809537f400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3382 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x213/0x400 mm/slab.c:3729 ffff88809537f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809537f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ mempool_create_node+0x2bb/0x3d0 mm/mempool.c:211 ffff88809537f580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb mempool_create_kmalloc_pool include/linux/mempool.h:61 [inline] create_fs_client fs/ceph/super.c:668 [inline] ceph_mount+0x78a/0x181c fs/ceph/super.c:1032 ffff88809537f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== mount_fs+0x92/0x2a0 fs/super.c:1237 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+0x3c9/0x25e0 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+0x46/0xbb RIP: 0033:0x45ca69 RSP: 002b:00007f2f448b1c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f62c0 RCX: 000000000045ca69 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480 RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3ea R15: 00007f2f448b26d4 Mem-Info: active_anon:184999 inactive_anon:1144483 isolated_anon:0 active_file:1094 inactive_file:719 isolated_file:100 unevictable:8192 dirty:13 writeback:0 unstable:0 slab_reclaimable:14923 slab_unreclaimable:122815 mapped:55598 shmem:6254 pagetables:19916 bounce:0 free:25799 free_pcp:295 free_cma:0 Node 0 active_anon:724460kB inactive_anon:1071960kB active_file:3976kB inactive_file:2592kB unevictable:32768kB isolated(anon):0kB isolated(file):260kB mapped:221964kB dirty:48kB writeback:0kB shmem:16800kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 813056kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no Node 1 active_anon:15536kB inactive_anon:3505972kB active_file:72kB inactive_file:52kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:228kB dirty:4kB writeback:0kB shmem:8216kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no Node 0 DMA free:10452kB min:220kB low:272kB high:324kB active_anon:92kB inactive_anon:4584kB active_file:16kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:96kB pagetables:188kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB