================================================================== BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313 [inline] BUG: KASAN: slab-use-after-free in current_time+0x354/0x3b0 fs/inode.c:2378 Read of size 2 at addr ffff8880422a3dc2 by task syz.3.787/9203 CPU: 2 UID: 0 PID: 9203 Comm: syz.3.787 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595 is_mgtime include/linux/fs.h:2313 [inline] current_time+0x354/0x3b0 fs/inode.c:2378 atime_needs_update+0x33f/0x6b0 fs/inode.c:2236 pick_link+0x3b0/0x13c0 fs/namei.c:2040 step_into_slowpath+0x9ba/0xf90 fs/namei.c:2123 step_into fs/namei.c:2148 [inline] walk_component fs/namei.c:2284 [inline] link_path_walk+0xf28/0x1cc0 fs/namei.c:2652 path_parentat fs/namei.c:2856 [inline] __filename_parentat+0x213/0x740 fs/namei.c:2880 filename_parentat fs/namei.c:2898 [inline] filename_unlinkat+0xf7/0x730 fs/namei.c:5537 __do_sys_unlinkat fs/namei.c:5597 [inline] __se_sys_unlinkat fs/namei.c:5589 [inline] __x64_sys_unlinkat+0xc0/0x130 fs/namei.c:5589 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc73c19ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc73cfff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007fc73c416090 RCX: 00007fc73c19ce59 RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000005 RBP: 00007fc73c232d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc73c416128 R14: 00007fc73c416090 R15: 00007ffc663e1528 Allocated by task 9194: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_lru_noprof+0x246/0x6e0 mm/slub.c:4918 alloc_inode+0x183/0x250 fs/inode.c:347 new_inode+0x22/0x1c0 fs/inode.c:1179 bpf_get_inode kernel/bpf/inode.c:117 [inline] bpf_get_inode kernel/bpf/inode.c:102 [inline] bpf_symlink+0x69/0x240 kernel/bpf/inode.c:391 vfs_symlink fs/namei.c:5643 [inline] vfs_symlink+0x178/0x4d0 fs/namei.c:5622 filename_symlinkat+0x2a6/0x560 fs/namei.c:5668 __do_sys_symlinkat fs/namei.c:5688 [inline] __se_sys_symlinkat fs/namei.c:5683 [inline] __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5683 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 9194: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6251 [inline] kmem_cache_free+0x127/0x6c0 mm/slub.c:6378 destroy_inode+0xcb/0x1c0 fs/inode.c:394 evict+0x599/0xad0 fs/inode.c:865 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 filename_unlinkat+0x466/0x730 fs/namei.c:5572 __do_sys_unlinkat fs/namei.c:5597 [inline] __se_sys_unlinkat fs/namei.c:5589 [inline] __x64_sys_unlinkat+0xc0/0x130 fs/namei.c:5589 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880422a3dc0 which belongs to the cache inode_cache of size 1088 The buggy address is located 2 bytes inside of freed 1088-byte region [ffff8880422a3dc0, ffff8880422a4200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880422a2f80 pfn:0x422a0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880422a7b81 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801d6bc000 ffffea000108c410 ffffea0000ef2810 raw: ffff8880422a2f80 00000008001a0016 00000000f5000000 ffff8880422a7b81 head: 00fff00000000240 ffff88801d6bc000 ffffea000108c410 ffffea0000ef2810 head: ffff8880422a2f80 00000008001a0016 00000000f5000000 ffff8880422a7b81 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6184, tgid 6183 (syz.3.56), ts 87046625942, free_ts 86807239498 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1853 prep_new_page mm/page_alloc.c:1861 [inline] get_page_from_freelist+0x11a6/0x3410 mm/page_alloc.c:3941 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5221 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab mm/slub.c:3467 [inline] new_slab+0xa6/0x6c0 mm/slub.c:3525 refill_objects+0x277/0x420 mm/slub.c:7272 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x375/0x650 mm/slub.c:4652 alloc_from_pcs mm/slub.c:4750 [inline] slab_alloc_node mm/slub.c:4884 [inline] kmem_cache_alloc_lru_noprof+0x485/0x6e0 mm/slub.c:4918 alloc_inode+0x183/0x250 fs/inode.c:347 new_inode_pseudo include/linux/fs.h:3015 [inline] prepare_anon_dentry fs/libfs.c:2156 [inline] path_from_stashed+0x25b/0x750 fs/libfs.c:2243 ns_get_path_cb fs/nsfs.c:76 [inline] ns_get_path+0x60/0x80 fs/nsfs.c:99 proc_ns_get_link+0x121/0x230 fs/proc/namespaces.c:61 pick_link+0xd17/0x13c0 fs/namei.c:2064 step_into_slowpath+0x9ba/0xf90 fs/namei.c:2123 step_into fs/namei.c:2148 [inline] open_last_lookups fs/namei.c:4646 [inline] path_openat+0xf95/0x31a0 fs/namei.c:4855 do_file_open+0x20e/0x430 fs/namei.c:4887 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364 page last free pid 6147 tgid 6147 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1397 [inline] __free_frozen_pages+0x794/0x10a0 mm/page_alloc.c:2938 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4906 vm_area_alloc+0x1f/0x160 mm/vma_init.c:32 __mmap_new_vma mm/vma.c:2547 [inline] __mmap_region+0x104d/0x2dd0 mm/vma.c:2771 mmap_region+0x35d/0x620 mm/vma.c:2857 do_mmap+0xc63/0x12f0 mm/mmap.c:560 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0xe4/0x610 mm/mmap.c:606 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880422a3c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880422a3d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880422a3d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880422a3e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880422a3e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================