Hello, syzbot found the following issue on: HEAD commit: 68a00424bf69 Add linux-next specific files for 20220824 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=10cedc45080000 kernel config: https://syzkaller.appspot.com/x/.config?x=591008a24ae652d0 dashboard link: https://syzkaller.appspot.com/bug?extid=8bee3285b9e190f1509e compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123a6fb5080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15381113080000 The issue was bisected to: commit b10b85fe5149ee8b39fbbf86095b303632dde2cd Author: Miklos Szeredi <mszeredi@xxxxxxxxxx> Date: Wed Jul 27 14:31:30 2022 +0000 ovl: warn if trusted xattr creation fails bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=126b3c65080000 final oops: https://syzkaller.appspot.com/x/report.txt?x=116b3c65080000 console output: https://syzkaller.appspot.com/x/log.txt?x=166b3c65080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8bee3285b9e190f1509e@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: b10b85fe5149 ("ovl: warn if trusted xattr creation fails") ================================================================== BUG: KASAN: use-after-free in kernfs_type include/linux/kernfs.h:335 [inline] BUG: KASAN: use-after-free in kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline] BUG: KASAN: use-after-free in __kernfs_remove+0xa09/0xb50 fs/kernfs/dir.c:1369 Read of size 2 at addr ffff8880175239a8 by task syz-executor325/4044 CPU: 1 PID: 4044 Comm: syz-executor325 Not tainted 6.0.0-rc2-next-20220824-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 kernfs_type include/linux/kernfs.h:335 [inline] kernfs_leftmost_descendant fs/kernfs/dir.c:1261 [inline] __kernfs_remove+0xa09/0xb50 fs/kernfs/dir.c:1369 kernfs_remove_by_name_ns+0xa8/0x110 fs/kernfs/dir.c:1589 sysfs_slab_add+0x13e/0x1e0 mm/slub.c:5756 __kmem_cache_create+0x509/0x690 mm/slub.c:4745 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x1f9/0x300 mm/slab_common.c:335 p9_client_create+0xca5/0x1070 net/9p/client.c:993 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f9adb816389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4b66cf98 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff4b66cfd0 RCX: 00007f9adb816389 RDX: 0000000020000280 RSI: 00000000200002c0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000020000140 R09: 000000000000c837 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 R13: 000000000000c837 R14: 00007fff4b66cfbc R15: 00007fff4b66cfc0 </TASK> Allocated by task 4039: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3229 [inline] slab_alloc mm/slub.c:3237 [inline] __kmem_cache_alloc_lru mm/slub.c:3244 [inline] kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3253 kmem_cache_zalloc include/linux/slab.h:685 [inline] __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593 kernfs_new_node fs/kernfs/dir.c:655 [inline] kernfs_create_dir_ns+0x9c/0x220 fs/kernfs/dir.c:1010 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59 create_dir lib/kobject.c:63 [inline] kobject_add_internal+0x2c9/0x8f0 lib/kobject.c:223 kobject_add_varg lib/kobject.c:358 [inline] kobject_init_and_add+0x101/0x160 lib/kobject.c:441 sysfs_slab_add+0x161/0x1e0 mm/slub.c:5767 __kmem_cache_create+0x509/0x690 mm/slub.c:4745 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x1f9/0x300 mm/slab_common.c:335 p9_client_create+0xca5/0x1070 net/9p/client.c:993 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4044: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1740 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1766 slab_free mm/slub.c:3497 [inline] kmem_cache_free+0xe7/0x5b0 mm/slub.c:3519 kernfs_put.part.0+0x2c4/0x540 fs/kernfs/dir.c:547 kernfs_put+0x42/0x50 fs/kernfs/dir.c:521 __kernfs_remove+0x7a6/0xb50 fs/kernfs/dir.c:1407 kernfs_remove_by_name_ns+0xa8/0x110 fs/kernfs/dir.c:1589 sysfs_slab_add+0x13e/0x1e0 mm/slub.c:5756 __kmem_cache_create+0x509/0x690 mm/slub.c:4745 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x1f9/0x300 mm/slab_common.c:335 p9_client_create+0xca5/0x1070 net/9p/client.c:993 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888017523910 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 152 bytes inside of 168-byte region [ffff888017523910, ffff8880175239b8) The buggy address belongs to the physical page: page:ffffea00005d48c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888017523570 pfn:0x17523 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00005d4c80 dead000000000006 ffff8880119d4c80 raw: ffff888017523570 000000008011000b 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2122740088, free_ts 0 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5507 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2113 alloc_pages+0x22f/0x270 mm/mempolicy.c:2275 alloc_slab_page mm/slub.c:1810 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1955 new_slab mm/slub.c:2015 [inline] ___slab_alloc+0xa3e/0x11d0 mm/slub.c:3017 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3104 slab_alloc_node mm/slub.c:3195 [inline] slab_alloc mm/slub.c:3237 [inline] __kmem_cache_alloc_lru mm/slub.c:3244 [inline] kmem_cache_alloc+0x31c/0x3d0 mm/slub.c:3253 kmem_cache_zalloc include/linux/slab.h:685 [inline] __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:593 kernfs_new_node fs/kernfs/dir.c:655 [inline] kernfs_create_dir_ns+0x9c/0x220 fs/kernfs/dir.c:1010 internal_create_group+0x787/0xb10 fs/sysfs/group.c:136 kernel_add_sysfs_param kernel/params.c:814 [inline] param_sysfs_builtin kernel/params.c:851 [inline] param_sysfs_init+0x342/0x43b kernel/params.c:970 do_one_initcall+0xfe/0x650 init/main.c:1301 do_initcall_level init/main.c:1376 [inline] do_initcalls init/main.c:1392 [inline] do_basic_setup init/main.c:1411 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1630 kernel_init+0x1a/0x1d0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page_owner free stack trace missing Memory state around the buggy address: ffff888017523880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff888017523900: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888017523980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa ^ ffff888017523a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888017523a80: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
