================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:108 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x714/0x780 mm/filemap.c:169 Read of size 4 at addr ffff8881e66b5488 by task syz.5.837/4019 CPU: 0 PID: 4019 Comm: syz.5.837 Tainted: G W 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack+0x1e/0x20 lib/dump_stack.c:77 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384 __kasan_report+0xef/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] cleancache_invalidate_page include/linux/cleancache.h:108 [inline] unaccount_page_cache_page+0x714/0x780 mm/filemap.c:169 __delete_from_page_cache+0xc3/0x4b0 mm/filemap.c:237 __remove_mapping+0x4ba/0x590 mm/vmscan.c:985 shrink_page_list+0x201b/0x3be0 mm/vmscan.c:1489 shrink_inactive_list+0x479/0xd30 mm/vmscan.c:2008 shrink_list mm/vmscan.c:2300 [inline] shrink_node_memcg+0xaf8/0x1af0 mm/vmscan.c:2630 shrink_node+0x433/0x1430 mm/vmscan.c:2843 shrink_zones mm/vmscan.c:3063 [inline] do_try_to_free_pages+0x5aa/0x11c0 mm/vmscan.c:3121 try_to_free_mem_cgroup_pages+0x22e/0x6a0 mm/vmscan.c:3422 try_charge+0x482/0x1310 mm/memcontrol.c:2627 mem_cgroup_try_charge+0x2c4/0x400 mm/memcontrol.c:6600 __add_to_page_cache_locked+0x160/0x8c0 mm/filemap.c:865 add_to_page_cache_lru+0xa7/0x210 mm/filemap.c:962 pagecache_get_page+0x540/0x780 mm/filemap.c:1840 f2fs_pagecache_get_page fs/f2fs/f2fs.h:2573 [inline] f2fs_write_begin+0x361/0x1cd0 fs/f2fs/data.c:3451 generic_perform_write+0x2b8/0x500 mm/filemap.c:3450 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3579 f2fs_file_write_iter+0x629/0xbe0 fs/f2fs/file.c:4471 call_write_iter include/linux/fs.h:1991 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x480/0x5d0 fs/read_write.c:496 vfs_write+0x20e/0x4c0 fs/read_write.c:558 ksys_pwrite64 fs/read_write.c:665 [inline] __do_sys_pwrite64 fs/read_write.c:675 [inline] __se_sys_pwrite64 fs/read_write.c:672 [inline] __x64_sys_pwrite64+0x191/0x220 fs/read_write.c:672 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f46cd6bf969 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:00007f46cbd28038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f46cd8e6fa0 RCX: 00007f46cd6bf969 RDX: 00000000ffffff07 RSI: 0000200000000140 RDI: 0000000000000006 RBP: 00007f46cd741ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000c61 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f46cd8e6fa0 R15: 00007ffece8418c8 Allocated by task 435: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_kmalloc+0xd/0x20 mm/kasan/common.c:543 __kmalloc+0x12a/0x2f0 mm/slub.c:3913 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x88/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:761 [inline] kvmalloc_array include/linux/mm.h:779 [inline] alloc_fdtable+0xd1/0x270 fs/file.c:111 dup_fd+0x786/0xaf0 fs/file.c:306 copy_files+0xc4/0x160 kernel/fork.c:1485 copy_process+0x10b5/0x2cf0 kernel/fork.c:2040 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 3711: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kfree+0xbe/0x260 mm/slub.c:4071 kvfree+0x4c/0x50 mm/util.c:625 __free_fdtable fs/file.c:31 [inline] put_files_struct+0x289/0x330 fs/file.c:416 exit_files+0x80/0xa0 fs/file.c:441 do_exit+0xa0c/0x2660 kernel/exit.c:856 do_group_exit+0x13e/0x300 kernel/exit.c:984 get_signal+0xdee/0x13d0 kernel/signal.c:2738 do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194 syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x13e/0x170 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881e66b5000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881e66b5000, ffff8881e66b5800) The buggy address belongs to the page: page:ffffea000799ac00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5c0c000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x35e/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x93/0x420 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x29e/0x420 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x176/0x2f0 mm/slub.c:3909 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] ops_init+0x89/0x4a0 net/core/net_namespace.c:131 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 copy_net_ns+0x314/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x1194/0x2cf0 kernel/fork.c:2055 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x7e4/0x910 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4956 [inline] __free_pages+0x8c/0x110 mm/page_alloc.c:4962 __free_slab+0x218/0x2d0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x165/0x1a0 mm/slub.c:2288 put_cpu_partial+0xc1/0x180 mm/slub.c:2324 __slab_free+0x2be/0x380 mm/slub.c:2971 do_slab_free mm/slub.c:3068 [inline] ___cache_free+0xbb/0xd0 mm/slub.c:3087 qlink_free+0x23/0x30 mm/kasan/quarantine.c:148 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1a8/0x200 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x42/0x200 mm/kasan/common.c:507 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x10d/0x2d0 mm/slub.c:4449 kstrdup mm/util.c:60 [inline] kstrdup_const+0x55/0x90 mm/util.c:82 kmem_cache_create_usercopy+0x9e/0x1d0 mm/slab_common.c:499 kmem_cache_create+0x13/0x20 mm/slab_common.c:564 Memory state around the buggy address: ffff8881e66b5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e66b5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e66b5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e66b5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e66b5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz.5.837 (4019) used greatest stack depth: 21056 bytes left