overlayfs: overlapping lowerdir path ================================================================== BUG: KASAN: slab-out-of-bounds in build_sit_entries syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:3961 [inline] BUG: KASAN: slab-out-of-bounds in f2fs_build_segment_manager+0x8040/0xac60 syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:4230 Read of size 4 at addr ffff8880a963cba4 by task syz-executor.0/11140 CPU: 1 PID: 11140 Comm: syz-executor.0 Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:354 kasan_report syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:412 [inline] __asan_report_load4_noabort+0x88/0x90 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:432 build_sit_entries syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:3961 [inline] f2fs_build_segment_manager+0x8040/0xac60 syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:4230 f2fs_fill_super+0x31d9/0x7050 syzkaller/managers/linux-4-19/kernel/fs/f2fs/super.c:3016 mount_bdev+0x2fc/0x3b0 syzkaller/managers/linux-4-19/kernel/fs/super.c:1158 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline] do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799 ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline] __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4672ba Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7e6623afa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7e6623b000 RBP: 00007f7e6623b040 R08: 00007f7e6623b040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f7e6623b000 R15: 0000000020014b00 Allocated by task 11140: __do_kmalloc_node syzkaller/managers/linux-4-19/kernel/mm/slab.c:3689 [inline] __kmalloc_node+0x4c/0x70 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3696 kmalloc_node syzkaller/managers/linux-4-19/kernel/./include/linux/slab.h:557 [inline] kvmalloc_node+0x61/0xf0 syzkaller/managers/linux-4-19/kernel/mm/util.c:423 kvmalloc syzkaller/managers/linux-4-19/kernel/./include/linux/mm.h:577 [inline] f2fs_kvmalloc syzkaller/managers/linux-4-19/kernel/fs/f2fs/f2fs.h:2687 [inline] f2fs_kvzalloc syzkaller/managers/linux-4-19/kernel/fs/f2fs/f2fs.h:2693 [inline] build_sit_info syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:3809 [inline] f2fs_build_segment_manager+0x2148/0xac60 syzkaller/managers/linux-4-19/kernel/fs/f2fs/segment.c:4219 f2fs_fill_super+0x31d9/0x7050 syzkaller/managers/linux-4-19/kernel/fs/f2fs/super.c:3016 mount_bdev+0x2fc/0x3b0 syzkaller/managers/linux-4-19/kernel/fs/super.c:1158 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline] do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799 ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline] __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 25071: __cache_free syzkaller/managers/linux-4-19/kernel/mm/slab.c:3503 [inline] kfree+0xcc/0x210 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3822 kvfree+0x59/0x60 syzkaller/managers/linux-4-19/kernel/mm/util.c:452 f2fs_destroy_node_manager+0x84f/0xbd0 syzkaller/managers/linux-4-19/kernel/fs/f2fs/node.c:3118 f2fs_put_super+0x49a/0x980 syzkaller/managers/linux-4-19/kernel/fs/f2fs/super.c:1068 generic_shutdown_super+0x144/0x370 syzkaller/managers/linux-4-19/kernel/fs/super.c:456 kill_block_super+0x97/0xf0 syzkaller/managers/linux-4-19/kernel/fs/super.c:1185 kill_f2fs_super+0x241/0x330 syzkaller/managers/linux-4-19/kernel/fs/f2fs/super.c:3257 deactivate_locked_super+0x94/0x160 syzkaller/managers/linux-4-19/kernel/fs/super.c:329 deactivate_super+0x174/0x1a0 syzkaller/managers/linux-4-19/kernel/fs/super.c:360 cleanup_mnt+0x1a8/0x290 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:1098 task_work_run+0x148/0x1c0 syzkaller/managers/linux-4-19/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-19/kernel/./include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:167 prepare_exit_to_usermode syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:198 [inline] syscall_return_slowpath syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a963cb80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 36 bytes inside of 64-byte region [ffff8880a963cb80, ffff8880a963cbc0) The buggy address belongs to the page: page:ffffea0002a58f00 count:1 mapcount:0 mapping:ffff88813bff0340 index:0xffff8880a963cf80 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002501f48 ffffea0002593488 ffff88813bff0340 raw: ffff8880a963cf80 ffff8880a963c000 000000010000001d 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a963ca80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a963cb00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880a963cb80: 00 00 00 00 04 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a963cc00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a963cc80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================