================================================================== BUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 Read of size 8 at addr ffff888023160020 by task syz-executor.3/5543 CPU: 1 PID: 5543 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 __do_fault+0x135/0x460 mm/memory.c:4396 do_shared_fault mm/memory.c:4818 [inline] do_fault mm/memory.c:4892 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5164 [inline] __handle_mm_fault+0x23c3/0x72d0 mm/memory.c:5305 handle_mm_fault+0x27f/0x770 mm/memory.c:5470 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2a8/0x890 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_stos_alternative+0x40/0x80 arch/x86/lib/clear_page_64.S:96 Code: ff c7 48 ff c9 75 f6 c3 cc cc cc cc 48 89 07 48 83 c7 08 83 e9 08 74 ef 83 f9 08 73 ef eb de 66 2e 0f 1f 84 00 00 00 00 00 90 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 RSP: 0018:ffffc9000a4c74f8 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000020081000 RCX: 0000000000001000 RDX: 0000000000001000 RSI: ffffffff8baad360 RDI: 0000000020080000 RBP: ffffc9000a4c7650 R08: ffffffff8f860def R09: 1ffffffff1f0c1bd R10: dffffc0000000000 R11: fffffbfff1f0c1be R12: 0000000020080000 R13: 0000000020081000 R14: ffffc9000a4c7b68 R15: 1ffff92001498f6d __clear_user arch/x86/include/asm/uaccess_64.h:172 [inline] clear_user arch/x86/include/asm/uaccess_64.h:189 [inline] zero_to_user_iter lib/iov_iter.c:442 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] iov_iter_zero+0x1e3/0x1b60 lib/iov_iter.c:455 iomap_dio_hole_iter fs/iomap/direct-io.c:447 [inline] iomap_dio_iter fs/iomap/direct-io.c:495 [inline] __iomap_dio_rw+0x14b7/0x2320 fs/iomap/direct-io.c:660 f2fs_dio_read_iter fs/f2fs/file.c:4405 [inline] f2fs_file_read_iter+0x4d2/0x770 fs/f2fs/file.c:4459 call_read_iter include/linux/fs.h:2102 [inline] aio_read+0x364/0x500 fs/aio.c:1608 io_submit_one+0x884/0x18b0 fs/aio.c:2058 __do_sys_io_submit fs/aio.c:2117 [inline] __se_sys_io_submit+0x179/0x2f0 fs/aio.c:2087 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f42b887de69 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:00007f42b95a40c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f42b89abf80 RCX: 00007f42b887de69 RDX: 0000000020000540 RSI: 0000000000003f0a RDI: 00007f42b9583000 RBP: 00007f42b88ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f42b89abf80 R15: 00007ffe14020708 Allocated by task 5543: 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:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x174/0x340 mm/slub.c:3852 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xbd9/0x1fa0 mm/mmap.c:2814 do_mmap+0x7af/0xe60 mm/mmap.c:1387 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573 ksys_mmap_pgoff+0x504/0x6e0 mm/mmap.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 5120: 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:579 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:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x102/0x2b0 mm/slub.c:4344 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471 __do_softirq+0x2bc/0x943 kernel/softirq.c:554 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:541 __call_rcu_common kernel/rcu/tree.c:2734 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2293 [inline] do_vmi_align_munmap+0x15a7/0x1930 mm/mmap.c:2639 do_vmi_munmap+0x24e/0x2d0 mm/mmap.c:2703 mmap_region+0x678/0x1fa0 mm/mmap.c:2754 do_mmap+0x7af/0xe60 mm/mmap.c:1387 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573 ksys_mmap_pgoff+0x504/0x6e0 mm/mmap.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888023160000 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff888023160000, ffff8880231600c0) The buggy address belongs to the physical page: page:ffffea00008c5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23160 memcg:ffff88802911ce01 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888015aecb40 ffffea00008da200 dead000000000002 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88802911ce01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4733, tgid 4733 (cat), ts 32440663483, free_ts 32431854695 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+0x256/0x680 mm/page_alloc.c:4569 __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:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x252/0x340 mm/slub.c:3852 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 mmap_region+0xbd9/0x1fa0 mm/mmap.c:2814 do_mmap+0x7af/0xe60 mm/mmap.c:1387 vm_mmap_pgoff+0x1e3/0x420 mm/util.c:573 ksys_mmap_pgoff+0x504/0x6e0 mm/mmap.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 4733 tgid 4733 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+0x34d/0x4e0 mm/mmu_gather.c:300 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392 exit_mmap+0x4b6/0xd40 mm/mmap.c:3300 __mmput+0x115/0x3c0 kernel/fork.c:1345 exec_mmap+0x66e/0x700 fs/exec.c:1051 begin_new_exec+0x119b/0x1ce0 fs/exec.c:1309 load_elf_binary+0x961/0x2590 fs/binfmt_elf.c:996 search_binary_handler fs/exec.c:1777 [inline] exec_binprm fs/exec.c:1819 [inline] bprm_execve+0xaf8/0x1790 fs/exec.c:1871 do_execveat_common+0x553/0x700 fs/exec.c:1978 do_execve fs/exec.c:2052 [inline] __do_sys_execve fs/exec.c:2128 [inline] __se_sys_execve fs/exec.c:2123 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2123 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88802315ff00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc 00 ffff88802315ff80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff888023160000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023160080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888023160100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: ff c7 inc %edi 2: 48 ff c9 dec %rcx 5: 75 f6 jne 0xfffffffd 7: c3 ret 8: cc int3 9: cc int3 a: cc int3 b: cc int3 c: 48 89 07 mov %rax,(%rdi) f: 48 83 c7 08 add $0x8,%rdi 13: 83 e9 08 sub $0x8,%ecx 16: 74 ef je 0x7 18: 83 f9 08 cmp $0x8,%ecx 1b: 73 ef jae 0xc 1d: eb de jmp 0xfffffffd 1f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 26: 00 00 00 29: 90 nop * 2a: 48 89 07 mov %rax,(%rdi) <-- trapping instruction 2d: 48 89 47 08 mov %rax,0x8(%rdi) 31: 48 89 47 10 mov %rax,0x10(%rdi) 35: 48 89 47 18 mov %rax,0x18(%rdi) 39: 48 89 47 20 mov %rax,0x20(%rdi) 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 47 rex.RXB