================================================================== BUG: KASAN: use-after-free in ptep_get include/linux/pgtable.h:338 [inline] BUG: KASAN: use-after-free in ptep_get_lockless include/linux/pgtable.h:608 [inline] BUG: KASAN: use-after-free in ptdump_pte_entry+0xf6/0x100 mm/ptdump.c:123 Read of size 8 at addr ffff888063ceb250 by task syz.5.1535/13402 CPU: 1 UID: 0 PID: 13402 Comm: syz.5.1535 Not tainted 6.13.0-rc6-syzkaller-00036-gfbfd64d25c7a #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+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 ptep_get include/linux/pgtable.h:338 [inline] ptep_get_lockless include/linux/pgtable.h:608 [inline] ptdump_pte_entry+0xf6/0x100 mm/ptdump.c:123 walk_pte_range_inner+0x256/0x360 mm/pagewalk.c:50 walk_pte_range mm/pagewalk.c:81 [inline] walk_pmd_range mm/pagewalk.c:156 [inline] walk_pud_range mm/pagewalk.c:226 [inline] walk_p4d_range mm/pagewalk.c:264 [inline] walk_pgd_range+0xfe4/0x1a70 mm/pagewalk.c:305 walk_page_range_novma+0x1b5/0x260 mm/pagewalk.c:648 ptdump_walk_pgd+0xec/0x2f0 mm/ptdump.c:158 ptdump_walk_pgd_level_core+0x15f/0x220 arch/x86/mm/dump_pagetables.c:391 ptdump_walk_pgd_level_checkwx+0x63/0x90 arch/x86/mm/dump_pagetables.c:444 check_wx_show+0x13/0x70 mm/ptdump.c:170 seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230 seq_read+0x39f/0x4e0 fs/seq_file.c:162 full_proxy_read+0xfb/0x1b0 fs/debugfs/file.c:351 do_loop_readv_writev fs/read_write.c:840 [inline] do_loop_readv_writev fs/read_write.c:828 [inline] vfs_readv+0x6bf/0x890 fs/read_write.c:1013 do_readv+0x133/0x340 fs/read_write.c:1073 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f502dd85d29 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:00007f502eb19038 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007f502df76160 RCX: 00007f502dd85d29 RDX: 0000000000000003 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007f502de01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f502df76160 R15: 00007ffd027c0568 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x63ceb flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea00018f3a88 ffffea00018f3b08 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 5829, tgid 5829 (syz-executor), ts 88137978099, free_ts 552862775146 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 pagetable_alloc_noprof include/linux/mm.h:2899 [inline] __pte_alloc_one_kernel_noprof include/asm-generic/pgalloc.h:21 [inline] pte_alloc_one_kernel_noprof include/asm-generic/pgalloc.h:39 [inline] __pte_alloc_kernel+0x22/0x200 mm/memory.c:458 vmap_pages_pte_range mm/vmalloc.c:497 [inline] vmap_pages_pmd_range mm/vmalloc.c:529 [inline] vmap_pages_pud_range mm/vmalloc.c:547 [inline] vmap_pages_p4d_range mm/vmalloc.c:565 [inline] vmap_small_pages_range_noflush+0xb38/0xd30 mm/vmalloc.c:587 __vmap_pages_range_noflush+0x67d/0x700 mm/vmalloc.c:616 vmap_pages_range_noflush mm/vmalloc.c:641 [inline] vmap_pages_range mm/vmalloc.c:661 [inline] __vmalloc_area_node mm/vmalloc.c:3713 [inline] __vmalloc_node_range_noprof+0xbb8/0x1530 mm/vmalloc.c:3846 vmalloc_user_noprof+0x6b/0x90 mm/vmalloc.c:4000 kcov_ioctl+0x4c/0x730 kernel/kcov.c:716 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 13404 tgid 13403 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 pmd_free_pte_page+0xb0/0xe0 arch/x86/mm/pgtable.c:883 vmap_try_huge_pmd mm/vmalloc.c:153 [inline] vmap_pmd_range mm/vmalloc.c:172 [inline] vmap_pud_range mm/vmalloc.c:228 [inline] vmap_p4d_range mm/vmalloc.c:279 [inline] vmap_range_noflush+0x579/0x1060 mm/vmalloc.c:303 __vmap_pages_range_noflush+0x104/0x700 mm/vmalloc.c:621 vmap_pages_range_noflush mm/vmalloc.c:641 [inline] vmap_pages_range mm/vmalloc.c:661 [inline] __vmalloc_area_node mm/vmalloc.c:3713 [inline] __vmalloc_node_range_noprof+0xbb8/0x1530 mm/vmalloc.c:3846 __kvmalloc_node_noprof+0x14f/0x1a0 mm/util.c:667 kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline] __do_sys_listmount+0x1be/0xe90 fs/namespace.c:5590 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888063ceb100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888063ceb180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888063ceb200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888063ceb280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888063ceb300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================