cgroup: noprefix used incorrectly ================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172 Read of size 4 at addr ffff888128222470 by task syz.1.4341/14754 CPU: 0 PID: 14754 Comm: syz.1.4341 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x6f2/0x760 mm/filemap.c:172 __delete_from_page_cache+0xbe/0x470 mm/filemap.c:240 __remove_mapping+0x80a/0x980 mm/vmscan.c:1216 shrink_page_list+0x24fc/0x5540 mm/vmscan.c:1824 shrink_inactive_list mm/vmscan.c:2331 [inline] shrink_list mm/vmscan.c:2576 [inline] shrink_lruvec+0x1209/0x39a0 mm/vmscan.c:5793 shrink_node_memcgs mm/vmscan.c:5985 [inline] shrink_node+0x1205/0x2aa0 mm/vmscan.c:6015 shrink_zones mm/vmscan.c:6221 [inline] do_try_to_free_pages+0x5a8/0x1580 mm/vmscan.c:6279 try_to_free_pages+0x4e6/0xc40 mm/vmscan.c:6514 __perform_reclaim mm/page_alloc.c:4955 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4978 [inline] __alloc_pages_slowpath+0x1457/0x30b0 mm/page_alloc.c:5438 __alloc_pages+0x338/0x460 mm/page_alloc.c:5835 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline] pte_alloc_one+0x70/0x190 arch/x86/mm/pgtable.c:33 __pte_alloc+0x75/0x2a0 mm/memory.c:502 do_anonymous_page mm/memory.c:4046 [inline] handle_pte_fault+0x1eeb/0x2710 mm/memory.c:4909 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1af9/0x1de0 mm/memory.c:5333 handle_mm_fault include/linux/mm.h:1847 [inline] do_user_addr_fault+0x828/0x1250 arch/x86/mm/fault.c:1416 handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1560 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0033:0x7f0496c29b0e Code: c1 49 39 4f 08 72 54 8d 4d ff 85 ed 74 3b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01 RSP: 002b:00007f04957cc470 EFLAGS: 00010206 RAX: 0000000000453001 RBX: 00007f04957cc530 RCX: 000000000000008e RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f04957cc5d0 RBP: 0000000000000102 R08: 00007f048d3ad000 R09: 0000000000453000 R10: 0000000000000000 R11: 00007f04957cc540 R12: 0000000000000001 R13: 00007f0496e28620 R14: 0000000000000000 R15: 00007f04957cc5d0 Allocated by task 9374: 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:433 [inline] __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xb9/0x500 fs/namei.c:138 user_path_at_empty+0x30/0x1c0 fs/namei.c:2890 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0x10e/0x3d0 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 9374: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3544 putname fs/namei.c:271 [inline] user_path_at_empty+0x161/0x1c0 fs/namei.c:2893 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0x10e/0x3d0 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888128222200 which belongs to the cache names_cache of size 4096 The buggy address is located 624 bytes inside of 4096-byte region [ffff888128222200, ffff888128223200) The buggy address belongs to the page: page:ffffea0004a08800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x128220 head:ffffea0004a08800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001c5200 raw: 0000000000000000 0000000000070007 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), pid 9374, ts 662934970005, free_ts 662910370104 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 getname_flags+0xb9/0x500 fs/namei.c:138 user_path_at_empty+0x30/0x1c0 fs/namei.c:2890 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0x10e/0x3d0 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5898 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x11f/0x2c0 mm/slub.c:4954 kmemdup_nul+0x2c/0xa0 mm/util.c:155 security_context_to_sid_core+0xda/0x5d0 security/selinux/ss/services.c:1539 Memory state around the buggy address: ffff888128222300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888128222380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888128222400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888128222480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888128222500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================