ffff888029471b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ ================================================================== BUG: KASAN: slab-out-of-bounds in hex_dump_to_buffer+0x72a/0xb90 lib/hexdump.c:193 Read of size 1 at addr ffff888029471b40 by task syz-executor.2/14929 CPU: 0 PID: 14929 Comm: syz-executor.2 Not tainted 6.0.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 hex_dump_to_buffer+0x72a/0xb90 lib/hexdump.c:193 print_hex_dump+0x131/0x260 lib/hexdump.c:276 ea_get+0xcfb/0x1290 fs/jfs/xattr.c:561 __jfs_getxattr+0xc4/0x400 fs/jfs/xattr.c:807 jfs_get_acl+0x70/0x140 fs/jfs/acl.c:38 get_acl+0x157/0x260 fs/posix_acl.c:152 check_acl+0x35/0x150 fs/namei.c:306 acl_permission_check fs/namei.c:351 [inline] generic_permission+0x388/0x4e0 fs/namei.c:404 do_inode_permission fs/namei.c:465 [inline] inode_permission+0xa1/0x450 fs/namei.c:525 path_permission include/linux/fs.h:2902 [inline] unix_find_bsd net/unix/af_unix.c:1029 [inline] unix_find_other+0x39d/0x8f0 net/unix/af_unix.c:1086 unix_stream_connect+0x23d/0xe80 net/unix/af_unix.c:1470 p9_fd_create_unix+0x21a/0x460 net/9p/trans_fd.c:1046 p9_client_create+0x839/0x1000 net/9p/client.c:966 v9fs_session_init+0x1e6/0x1940 fs/9p/v9fs.c:408 v9fs_mount+0xd2/0xcb0 fs/9p/vfs_super.c:126 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fabef28a5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fabf0439168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fabef3ac1f0 RCX: 00007fabef28a5a9 RDX: 00000000200054c0 RSI: 0000000020005380 RDI: 0000000020000080 RBP: 00007fabef2e5580 R08: 0000000020005a40 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc903d46f R14: 00007fabf0439300 R15: 0000000000022000 Allocated by task 14921: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0xa3/0xd0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] slab_alloc mm/slub.c:3256 [inline] __kmem_cache_alloc_lru mm/slub.c:3263 [inline] kmem_cache_alloc_lru+0x175/0x2d0 mm/slub.c:3280 alloc_inode_sb include/linux/fs.h:3103 [inline] jfs_alloc_inode+0x21/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:260 [inline] iget_locked+0x191/0x830 fs/inode.c:1287 jfs_iget+0x20/0x3b0 fs/jfs/inode.c:29 jfs_lookup+0x1bb/0x380 fs/jfs/namei.c:1462 __lookup_slow+0x266/0x3a0 fs/namei.c:1685 lookup_slow+0x53/0x70 fs/namei.c:1702 walk_component+0x2e1/0x410 fs/namei.c:1993 lookup_last fs/namei.c:2450 [inline] path_lookupat+0x17d/0x450 fs/namei.c:2474 filename_lookup+0x274/0x650 fs/namei.c:2503 user_path_at_empty+0x40/0x1a0 fs/namei.c:2876 user_path_at include/linux/namei.h:57 [inline] do_fchownat+0xdf/0x240 fs/open.c:761 __do_sys_lchown fs/open.c:792 [inline] __se_sys_lchown fs/open.c:790 [inline] __x64_sys_lchown+0x81/0x90 fs/open.c:790 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x970 kernel/rcu/tree.c:2793 jfs_put_super+0x13f/0x190 fs/jfs/super.c:201 generic_shutdown_super+0x128/0x300 fs/super.c:491 kill_block_super+0x79/0xd0 fs/super.c:1427 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x970 kernel/rcu/tree.c:2793 jfs_put_super+0x13f/0x190 fs/jfs/super.c:201 generic_shutdown_super+0x128/0x300 fs/super.c:491 kill_block_super+0x79/0xd0 fs/super.c:1427 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:294 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888029471280 which belongs to the cache jfs_ip of size 2240 The buggy address is located 0 bytes to the right of 2240-byte region [ffff888029471280, ffff888029471b40) The buggy address belongs to the physical page: page:ffffea0000a51c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29470 head:ffffea0000a51c00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88807ee90a01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000db3400 dead000000000004 ffff8881467e5140 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff88807ee90a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 3875, tgid 3873 (syz-executor.2), ts 93257137995, free_ts 0 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x3ee/0xc40 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] __kmem_cache_alloc_lru mm/slub.c:3263 [inline] kmem_cache_alloc_lru+0x225/0x2d0 mm/slub.c:3280 alloc_inode_sb include/linux/fs.h:3103 [inline] jfs_alloc_inode+0x21/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:260 [inline] new_inode_pseudo+0x61/0x1d0 fs/inode.c:1019 new_inode+0x25/0x1d0 fs/inode.c:1047 jfs_fill_super+0x3fd/0xc50 fs/jfs/super.c:544 mount_bdev+0x26c/0x3a0 fs/super.c:1400 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 page_owner free stack trace missing Memory state around the buggy address: ffff888029471a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888029471a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888029471b00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888029471b80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888029471c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================