================================================================== BUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 Read of size 8 at addr ffff888028436d20 by task syz-executor.1/18604 CPU: 0 PID: 18604 Comm: syz-executor.1 Not tainted 6.8.0-rc6-syzkaller-00238-g5ad3cb0ed525 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 __do_fault+0x135/0x460 mm/memory.c:4396 do_read_fault mm/memory.c:4758 [inline] do_fault mm/memory.c:4888 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault+0x49e6/0x72d0 mm/memory.c:5305 handle_mm_fault+0x27e/0x770 mm/memory.c:5470 faultin_page mm/gup.c:958 [inline] __get_user_pages+0x6bd/0x1600 mm/gup.c:1241 populate_vma_page_range+0x2aa/0x380 mm/gup.c:1679 __mm_populate+0x279/0x460 mm/gup.c:1788 mm_populate include/linux/mm.h:3391 [inline] vm_mmap_pgoff+0x304/0x420 mm/util.c:561 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7fd5e967dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd5ea3420c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fd5e97ac120 RCX: 00007fd5e967dda9 RDX: 00000000027fffff RSI: 0000000000600000 RDI: 0000000020000000 RBP: 00007fd5e96ca47a R08: 0000000000000006 R09: 0000000000000000 R10: 0000000004002011 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd5e97ac120 R15: 00007ffc047b5838 Allocated by task 18604: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 vm_area_alloc+0x24/0x1d0 kernel/fork.c:465 mmap_region+0xbd8/0x1fa0 mm/mmap.c:2806 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 21500: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x102/0x2a0 mm/slub.c:4363 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465 __do_softirq+0x2bb/0x942 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:551 __call_rcu_common kernel/rcu/tree.c:2715 [inline] call_rcu+0x167/0xa80 kernel/rcu/tree.c:2829 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2285 [inline] do_vmi_align_munmap+0x15a7/0x1930 mm/mmap.c:2631 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2695 mmap_region+0x677/0x1fa0 mm/mmap.c:2746 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888028436d00 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff888028436d00, ffff888028436dc0) The buggy address belongs to the physical page: page:ffffea0000a10d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28436 memcg:ffff88802e83ac01 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888015ae6b40 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88802e83ac01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5101, tgid 5101 (syz-executor.1), ts 410561515820, free_ts 410089583667 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x24d/0x340 mm/slub.c:3867 vm_area_dup+0x27/0x290 kernel/fork.c:480 dup_mmap kernel/fork.c:695 [inline] dup_mm kernel/fork.c:1685 [inline] copy_mm+0xd94/0x21b0 kernel/fork.c:1734 copy_process+0x1d73/0x3fc0 kernel/fork.c:2497 kernel_clone+0x222/0x840 kernel/fork.c:2902 __do_sys_clone kernel/fork.c:3045 [inline] __se_sys_clone kernel/fork.c:3029 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3029 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 11741 tgid 11739 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346 free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532 release_pages+0x2117/0x2400 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392 exit_mmap+0x4b6/0xd40 mm/mmap.c:3292 __mmput+0x115/0x3c0 kernel/fork.c:1343 exit_mm+0x21f/0x310 kernel/exit.c:569 do_exit+0x9af/0x2740 kernel/exit.c:858 do_group_exit+0x206/0x2c0 kernel/exit.c:1020 get_signal+0x176d/0x1850 kernel/signal.c:2893 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x360 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff888028436c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028436c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888028436d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888028436d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888028436e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================