================================================================== BUG: KASAN: slab-use-after-free in handle_mm_fault+0x14f0/0x19a0 mm/memory.c:5842 Read of size 8 at addr ffff888011ca46e8 by task syz.1.181/6095 CPU: 0 UID: 0 PID: 6095 Comm: syz.1.181 Not tainted 6.10.0-rc7-next-20240712-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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 handle_mm_fault+0x14f0/0x19a0 mm/memory.c:5842 faultin_page mm/gup.c:1194 [inline] __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493 __get_user_pages_locked mm/gup.c:1760 [inline] __gup_longterm_locked+0x7c1/0x17d0 mm/gup.c:2494 gup_fast_fallback+0x2742/0x2b50 mm/gup.c:3385 pin_user_pages_fast+0xcc/0x160 mm/gup.c:3491 io_pin_pages+0x7e/0x170 io_uring/memmap.c:148 io_sqe_buffer_register+0x180/0x1b10 io_uring/rsrc.c:868 io_sqe_buffers_register+0x550/0x700 io_uring/rsrc.c:990 __io_uring_register io_uring/register.c:366 [inline] __do_sys_io_uring_register io_uring/register.c:561 [inline] __se_sys_io_uring_register+0xb22/0x15d0 io_uring/register.c:522 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f35ac575bd9 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:00007f35ad2ea048 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 00007f35ac703f60 RCX: 00007f35ac575bd9 RDX: 00000000200002c0 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f35ac5e4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 100000000000011a R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f35ac703f60 R15: 00007ffeee731fc8 Allocated by task 6095: 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:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 mmap_region+0xc3d/0x2090 mm/mmap.c:2944 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6099: 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+0xe0/0x150 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:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 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:3106 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210 remove_vma mm/mmap.c:189 [inline] remove_mt mm/mmap.c:2415 [inline] do_vmi_align_munmap+0x155c/0x18c0 mm/mmap.c:2758 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830 mmap_region+0x72f/0x2090 mm/mmap.c:2881 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888011ca46c8 which belongs to the cache vm_area_struct of size 184 The buggy address is located 32 bytes inside of freed 184-byte region [ffff888011ca46c8, ffff888011ca4780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ca4 memcg:ffff88801f0e1f01 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888015eefb40 ffffea00007c07c0 dead000000000004 raw: 0000000000000000 0000000080100010 00000001fdffffff ffff88801f0e1f01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4844, tgid 4844 (cmp), ts 29643818054, free_ts 29643589901 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2ccb/0x2d80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4732 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4044 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 mmap_region+0xc3d/0x2090 mm/mmap.c:2944 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 elf_map fs/binfmt_elf.c:385 [inline] elf_load+0x25d/0x6f0 fs/binfmt_elf.c:408 load_elf_binary+0x1027/0x2680 fs/binfmt_elf.c:1167 search_binary_handler fs/exec.c:1799 [inline] exec_binprm fs/exec.c:1841 [inline] bprm_execve+0xaf8/0x1770 fs/exec.c:1892 do_execveat_common+0x553/0x700 fs/exec.c:1999 page last free pid 4844 tgid 4844 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2692 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 shift_arg_pages fs/exec.c:759 [inline] setup_arg_pages+0xd2d/0x1000 fs/exec.c:858 load_elf_binary+0xb80/0x2680 fs/binfmt_elf.c:1014 search_binary_handler fs/exec.c:1799 [inline] exec_binprm fs/exec.c:1841 [inline] bprm_execve+0xaf8/0x1770 fs/exec.c:1892 do_execveat_common+0x553/0x700 fs/exec.c:1999 do_execve fs/exec.c:2073 [inline] __do_sys_execve fs/exec.c:2149 [inline] __se_sys_execve fs/exec.c:2144 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2144 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888011ca4580: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888011ca4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888011ca4680: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ^ ffff888011ca4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888011ca4780: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================