syz.1.16: attempt to access beyond end of device loop1: rw=0, sector=6491536, nr_sectors = 2 limit=128 Buffer I/O error on dev loop1, logical block 3245768, async page read ================================================================== BUG: KASAN: out-of-bounds in sysv_new_inode+0xfc7/0x1160 fs/sysv/ialloc.c:153 Read of size 2 at addr ffff88806cde61ce by task syz.1.16/6030 CPU: 1 UID: 0 PID: 6030 Comm: syz.1.16 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 sysv_new_inode+0xfc7/0x1160 fs/sysv/ialloc.c:153 sysv_symlink+0x9f/0x180 fs/sysv/namei.c:80 vfs_symlink+0x137/0x2e0 fs/namei.c:4615 do_symlinkat+0x222/0x3a0 fs/namei.c:4641 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660 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: 0033:0x7f6640d7e719 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:00007f6641acb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f6640f35f80 RCX: 00007f6640d7e719 RDX: 0000000000000000 RSI: 00000000200059c0 RDI: 00000000200049c0 RBP: 00007f6640df132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6640f35f80 R15: 00007ffed9f278e8 The buggy address belongs to the physical page: page: refcount:2 mapcount:1 mapping:0000000000000000 index:0x7fffffffe pfn:0x6cde6 memcg:ffff888140adc000 anon flags: 0xfff0000002090c(referenced|uptodate|active|owner_2|swapbacked|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff0000002090c 0000000000000000 dead000000000122 ffff88802f887bb1 raw: 00000007fffffffe 0000000000000000 0000000200000000 ffff888140adc000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 6031, tgid 6031 (kworker/u8:4), ts 76118470650, free_ts 76025263139 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3033/0x3180 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 folio_alloc_mpol_noprof mm/mempolicy.c:2283 [inline] vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2314 folio_prealloc+0x31/0x170 alloc_anon_folio mm/memory.c:4727 [inline] do_anonymous_page mm/memory.c:4784 [inline] do_pte_missing mm/memory.c:3963 [inline] handle_pte_fault+0x24dd/0x6800 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 faultin_page mm/gup.c:1187 [inline] __get_user_pages+0x1c82/0x49e0 mm/gup.c:1485 __get_user_pages_locked mm/gup.c:1751 [inline] get_user_pages_remote+0x31e/0xb60 mm/gup.c:2618 get_arg_page+0x266/0x580 fs/exec.c:225 copy_string_kernel+0x148/0x1f0 fs/exec.c:684 kernel_execve+0x5e2/0xa50 fs/exec.c:1999 call_usermodehelper_exec_async+0x237/0x380 kernel/umh.c:110 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page last free pid 6030 tgid 6029 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_folios+0xee2/0x18a0 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 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 vms_clear_ptes+0x437/0x530 mm/vma.c:1103 vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1147 do_vmi_align_munmap+0x613/0x730 mm/vma.c:1356 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1404 __vm_munmap+0x24c/0x480 mm/mmap.c:1612 __do_sys_munmap mm/mmap.c:1629 [inline] __se_sys_munmap mm/mmap.c:1626 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1626 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: ffff88806cde6080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806cde6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88806cde6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88806cde6200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806cde6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================