================================================================== BUG: KASAN: slab-use-after-free in afs_dynroot_test_super+0x51/0xb0 fs/afs/super.c:434 Read of size 8 at addr ffff88810ab1cdc0 by task syz-executor.5/4579 CPU: 0 PID: 4579 Comm: syz-executor.5 Not tainted 6.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf8/0x260 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 afs_dynroot_test_super+0x51/0xb0 fs/afs/super.c:434 sget_fc+0x10f/0x560 fs/super.c:764 afs_get_tree+0x55f/0xe30 fs/afs/super.c:577 vfs_get_tree+0x7e/0x190 fs/super.c:1711 do_new_mount+0x1e5/0x8f0 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x242/0x2d0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1fe667cae9 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:00007f1fe73440c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1fe679bf80 RCX: 00007f1fe667cae9 RDX: 0000000020000440 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 00007f1fe66c847a R08: 0000000020000480 R09: 0000000000000000 R10: 0000000002010800 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f1fe679bf80 R15: 00007ffd5b875af8 Allocated by task 4573: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:582 [inline] kzalloc include/linux/slab.h:703 [inline] afs_alloc_sbi fs/afs/super.c:509 [inline] afs_get_tree+0xac/0xe30 fs/afs/super.c:571 vfs_get_tree+0x7e/0x190 fs/super.c:1711 do_new_mount+0x1e5/0x8f0 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x242/0x2d0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4573: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x122/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0x294/0x450 mm/slub.c:3814 deactivate_locked_super+0x80/0x1c0 fs/super.c:454 cleanup_mnt+0x2a6/0x320 fs/namespace.c:1254 task_work_run+0x20a/0x280 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xa4/0xb0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x64/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x2b/0x1d0 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88810ab1cdc0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of freed 32-byte region [ffff88810ab1cdc0, ffff88810ab1cde0) The buggy address belongs to the physical page: page:ffffea00042ac700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ab1c anon flags: 0x100000000000200(slab|node=0|zone=2) page_type: 0xffffffff() raw: 0100000000000200 ffff888100041500 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 1288, tgid 1288 (rcS), ts 7605277977, free_ts 7120379117 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x26e/0x290 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x3f4f/0x4160 mm/page_alloc.c:3221 __alloc_pages+0x255/0x650 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x70/0x260 mm/slub.c:2062 ___slab_alloc+0x833/0xd60 mm/slub.c:3215 __slab_alloc mm/slub.c:3314 [inline] __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x1a6/0x260 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x99/0x1d0 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:703 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0xaa/0x480 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x4a6/0x4e0 security/tomoyo/realpath.c:283 tomoyo_init_log+0xff0/0x1fb0 security/tomoyo/audit.c:263 tomoyo_supervisor+0x312/0xfa0 security/tomoyo/common.c:2088 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x131/0x1e0 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0xf49/0x16f0 security/tomoyo/domain.c:879 tomoyo_bprm_check_security+0xd4/0x100 security/tomoyo/tomoyo.c:101 security_bprm_check+0x27/0x70 security/security.c:1102 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x800/0x920 mm/page_alloc.c:2348 free_unref_page+0x37/0x3c0 mm/page_alloc.c:2443 kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:427 apply_to_pte_range mm/memory.c:2596 [inline] apply_to_pmd_range mm/memory.c:2640 [inline] apply_to_pud_range mm/memory.c:2676 [inline] apply_to_p4d_range mm/memory.c:2712 [inline] __apply_to_page_range+0x754/0x8c0 mm/memory.c:2746 kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:544 __purge_vmap_area_lazy+0x1324/0x1550 mm/vmalloc.c:1770 _vm_unmap_aliases+0x62e/0x6b0 mm/vmalloc.c:2306 change_page_attr_set_clr+0x209/0xce0 arch/x86/mm/pat/set_memory.c:1838 change_page_attr_set arch/x86/mm/pat/set_memory.c:1879 [inline] set_memory_nx+0xcf/0x110 arch/x86/mm/pat/set_memory.c:2072 free_init_pages arch/x86/mm/init.c:937 [inline] free_kernel_image_pages arch/x86/mm/init.c:956 [inline] free_initmem+0x83/0xb0 arch/x86/mm/init.c:983 kernel_init+0x2c/0x1a0 init/main.c:1446 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88810ab1cc80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88810ab1cd00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff88810ab1cd80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88810ab1ce00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88810ab1ce80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ==================================================================