================================================================== BUG: KASAN: use-after-free in file_inode include/linux/fs.h:1343 [inline] BUG: KASAN: use-after-free in lock_get_status+0x209/0x9a0 fs/locks.c:2861 Read of size 8 at addr ffff888118772aa0 by task syz.0.1877/7093 CPU: 0 PID: 7093 Comm: syz.0.1877 Not tainted 5.10.228-syzkaller-00608-g0eb852f47fe5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 file_inode include/linux/fs.h:1343 [inline] lock_get_status+0x209/0x9a0 fs/locks.c:2861 locks_show+0x234/0x350 fs/locks.c:2936 seq_read_iter+0x916/0xd00 fs/seq_file.c:272 proc_reg_read_iter+0x1ba/0x290 fs/proc/inode.c:310 call_read_iter include/linux/fs.h:2017 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x990/0xba0 fs/read_write.c:496 ksys_pread64 fs/read_write.c:686 [inline] __do_sys_pread64 fs/read_write.c:696 [inline] __se_sys_pread64 fs/read_write.c:693 [inline] __x64_sys_pread64+0x1a6/0x230 fs/read_write.c:693 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f594e7b0f19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f594ce07058 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f594e977080 RCX: 00007f594e7b0f19 RDX: 000000000000007e RSI: 0000000020001440 RDI: 0000000000000007 RBP: 00007f594e824cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f594e977080 R15: 00007ffffc12c5e8 Allocated by task 2418: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960 kmem_cache_zalloc include/linux/slab.h:654 [inline] __alloc_file+0x29/0x330 fs/file_table.c:101 alloc_empty_file+0x95/0x180 fs/file_table.c:151 path_openat+0x105/0x3000 fs/namei.c:3495 do_filp_open+0x21c/0x460 fs/namei.c:3536 do_sys_openat2+0x13f/0x710 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1244 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 533: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219 file_free_rcu+0x9f/0xb0 fs/file_table.c:50 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748 __do_softirq+0x268/0x5bb kernel/softirq.c:309 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 file_free fs/file_table.c:58 [inline] __fput+0x5e4/0x7b0 fs/file_table.c:299 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack+0xe/0x10 mm/kasan/generic.c:353 task_work_add+0x27/0x1d0 kernel/task_work.c:38 fput_many+0xef/0x1b0 fs/file_table.c:342 fput+0x1a/0x20 fs/file_table.c:358 filp_close+0x106/0x150 fs/open.c:1331 __close_fd+0x33/0x50 fs/file.c:699 __do_sys_close fs/open.c:1344 [inline] __se_sys_close fs/open.c:1342 [inline] __x64_sys_close+0x68/0xc0 fs/open.c:1342 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888118772a80 which belongs to the cache filp of size 296 The buggy address is located 32 bytes inside of 296-byte region [ffff888118772a80, ffff888118772ba8) The buggy address belongs to the page: page:ffffea000461dc80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118772 head:ffffea000461dc80 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea0004370f00 0000000400000004 ffff88810018b080 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 112, ts 4060185669, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960 kmem_cache_zalloc include/linux/slab.h:654 [inline] __alloc_file+0x29/0x330 fs/file_table.c:101 alloc_empty_file+0x95/0x180 fs/file_table.c:151 path_openat+0x105/0x3000 fs/namei.c:3495 do_filp_open+0x21c/0x460 fs/namei.c:3536 do_sys_openat2+0x13f/0x710 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1244 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb page_owner free stack trace missing Memory state around the buggy address: ffff888118772980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888118772a00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc >ffff888118772a80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888118772b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888118772b80: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ==================================================================