================================================================== BUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 Read of size 8 at addr ffff88807e85d570 by task syz-executor.2/26667 CPU: 1 PID: 26667 Comm: syz-executor.2 Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x163/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x170 mm/kasan/report.c:601 f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 __do_fault+0x131/0x450 mm/memory.c:4376 do_read_fault mm/memory.c:4738 [inline] do_fault mm/memory.c:4868 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5144 [inline] __handle_mm_fault+0x49d7/0x72b0 mm/memory.c:5285 handle_mm_fault+0x27e/0x770 mm/memory.c:5450 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline] handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x111/0x2e0 lib/strncpy_from_user.c:139 Code: 00 00 00 4c 89 e6 e8 9e d9 c9 fc 49 83 fc 07 0f 86 9a 00 00 00 48 89 6c 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 <4f> 8b 3c 2f 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4c 89 fd 48 RSP: 0018:ffffc900178c7c98 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801c26d940 RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: 0000000000000fe0 R08: ffffffff84c524c2 R09: 1ffffd40001bddc0 R10: dffffc0000000000 R11: fffff940001bddc1 R12: 0000000000000fe0 R13: 0000000000000000 R14: ffff888037bb8020 R15: 00000000200000c0 getname_flags+0xf9/0x4f0 fs/namei.c:151 do_sys_openat2+0xd2/0x1d0 fs/open.c:1398 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1430 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f109107cda9 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:00007f1091d210c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f10911ac120 RCX: 00007f109107cda9 RDX: 000000000000275a RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f10910c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f10911ac120 R15: 00007ffd749f9a28 Allocated by task 26666: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x70 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:314 [inline] __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:340 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+0xbd8/0x1f90 mm/mmap.c:2804 do_mmap+0x76b/0xde0 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x4ff/0x6d0 mm/mmap.c:1425 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 26425: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x70 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x60 mm/kasan/common.c:257 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:2158 [inline] rcu_core+0xad8/0x17c0 kernel/rcu/tree.c:2433 __do_softirq+0x2b8/0x939 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xae/0x100 mm/kasan/generic.c:586 __call_rcu_common kernel/rcu/tree.c:2683 [inline] call_rcu+0x167/0xa80 kernel/rcu/tree.c:2797 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2283 [inline] do_vmi_align_munmap+0x159d/0x1930 mm/mmap.c:2629 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2693 mmap_region+0x677/0x1f90 mm/mmap.c:2744 do_mmap+0x76b/0xde0 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x4ff/0x6d0 mm/mmap.c:1425 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88807e85d550 which belongs to the cache vm_area_struct of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff88807e85d550, ffff88807e85d610) The buggy address belongs to the physical page: page:ffffea0001fa1740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e85d memcg:ffff888026fceb01 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8880146a1b40 ffffea0001e623c0 dead000000000002 raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff888026fceb01 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 4913, tgid 4913 (sh), ts 46537279473, free_ts 45568691486 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3570 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+0xd17/0x13d0 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+0x249/0x340 mm/slub.c:3867 vm_area_dup+0x27/0x280 kernel/fork.c:480 __split_vma+0x1a6/0xcf0 mm/mmap.c:2333 split_vma mm/mmap.c:2405 [inline] vma_modify+0x32d/0x410 mm/mmap.c:2447 vma_modify_flags include/linux/mm.h:3283 [inline] mprotect_fixup+0x4a5/0xb80 mm/mprotect.c:635 do_mprotect_pkey+0x900/0xe20 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:827 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b page last free pid 4897 tgid 4897 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+0x959/0xa80 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17b/0x250 mm/slub.c:2997 __slab_free+0x2fe/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:324 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_lru+0x172/0x340 mm/slub.c:3879 alloc_inode_sb include/linux/fs.h:3019 [inline] alloc_inode fs/inode.c:262 [inline] new_inode_pseudo+0x85/0x1d0 fs/inode.c:1005 get_pipe_inode fs/pipe.c:891 [inline] create_pipe_files+0x50/0x6a0 fs/pipe.c:931 __do_pipe_flags+0x48/0x2c0 fs/pipe.c:980 do_pipe2+0xd4/0x310 fs/pipe.c:1031 __do_sys_pipe2 fs/pipe.c:1049 [inline] __se_sys_pipe2 fs/pipe.c:1047 [inline] __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1047 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88807e85d400: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff88807e85d480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807e85d500: fc fc fc fc fc fc fc fc fc fc fa fb fb fb fb fb ^ ffff88807e85d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807e85d600: fb fb fc fc fc fc fc fc fc fc fc fc 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 4c 89 e6 add %cl,-0x1a(%rcx,%rcx,4) 6: e8 9e d9 c9 fc call 0xfcc9d9a9 b: 49 83 fc 07 cmp $0x7,%r12 f: 0f 86 9a 00 00 00 jbe 0xaf 15: 48 89 6c 24 08 mov %rbp,0x8(%rsp) 1a: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 21: ff ff 23: 45 31 ed xor %r13d,%r13d 26: 4c 89 3c 24 mov %r15,(%rsp) * 2a: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 49 8d 1c 07 lea (%r15,%rax,1),%rbx 3c: 4c 89 fd mov %r15,%rbp 3f: 48 rex.W