KASAN: use-after-free Read in end

Title	Replies (including bot)	Last reply
KASAN: use-after-free Read in end_requests	0 (1)	2018/08/15 16:36

bridge0: port 3(veth0) entered disabled state device veth0 entered promiscuous mode bridge0: port 3(veth0) entered blocking state bridge0: port 3(veth0) entered forwarding state ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 Read of size 8 at addr ffff8801d89e4a08 by task syz-executor6/7918 CPU: 1 PID: 7918 Comm: syz-executor6 Not tainted 4.18.0+ #186 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+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del_init include/linux/list.h:159 [inline] end_requests+0x180/0x460 fs/fuse/dev.c:2044 fuse_dev_release+0x18c/0x2e0 fs/fuse/dev.c:2154 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 get_signal+0x1559/0x1970 kernel/signal.c:2298 Unknown ioctl 1074021777 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 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:00007f7cdc2b5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: 0000000000000030 RBX: 00007f7cdc2b66d4 RCX: 0000000000457089 RDX: 0000000000001000 RSI: 0000000020001000 RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3240 R14: 00000000004c8281 R15: 0000000000000001 Allocated by task 7914: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 __fuse_request_alloc+0x27/0xf0 fs/fuse/dev.c:58 fuse_request_alloc+0x18/0x20 fs/fuse/dev.c:89 fuse_fill_super+0x12cb/0x1ee0 fs/fuse/inode.c:1154 mount_nodev+0x6b/0x110 fs/super.c:1220 fuse_mount+0x2c/0x40 fs/fuse/inode.c:1210 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2542 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2872 ksys_mount+0x12d/0x140 fs/namespace.c:3088 __do_sys_mount fs/namespace.c:3102 [inline] __se_sys_mount fs/namespace.c:3099 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3099 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7914: 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] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 fuse_request_free+0x8b/0xa0 fs/fuse/dev.c:104 fuse_put_request+0x2b7/0x360 fs/fuse/dev.c:294 request_end+0x3ee/0xb20 fs/fuse/dev.c:403 end_requests+0x296/0x460 fs/fuse/dev.c:2045 fuse_abort_conn+0xf9c/0x1580 fs/fuse/dev.c:2138 fuse_put_super+0x123/0x440 fs/fuse/inode.c:396 generic_shutdown_super+0x1bf/0x530 fs/super.c:453 kill_anon_super+0x3c/0x50 fs/super.c:1046 fuse_kill_sb_anon+0x90/0xb0 fs/fuse/inode.c:1223 deactivate_locked_super+0x97/0x100 fs/super.c:326 deactivate_super+0x193/0x1c0 fs/super.c:357 cleanup_mnt+0xbf/0x160 fs/namespace.c:1183 __cleanup_mnt+0x16/0x20 fs/namespace.c:1190 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 get_signal+0x1559/0x1970 kernel/signal.c:2298 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d89e4a00 which belongs to the cache fuse_request of size 448 The buggy address is located 8 bytes inside of 448-byte region [ffff8801d89e4a00, ffff8801d89e4bc0) The buggy address belongs to the page: page:ffffea0007627900 count:1 mapcount:0 mapping:ffff8801d478cb40 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006c23bc8 ffff8801d4749348 ffff8801d478cb40 raw: 0000000000000000 ffff8801d89e4000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d89e4900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d89e4980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801d89e4a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d89e4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d89e4b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================