================================================================== BUG: KASAN: slab-use-after-free in xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] BUG: KASAN: slab-use-after-free in xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] BUG: KASAN: slab-use-after-free in xsk_diag_dump+0x1573/0x15c0 net/xdp/xsk_diag.c:163 Read of size 4 at addr ffff8880792340e0 by task syz-executor.5/25221 CPU: 1 PID: 25221 Comm: syz-executor.5 Not tainted 6.5.0-rc7-syzkaller-00104-g4f9e7fabf864 #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+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] xsk_diag_dump+0x1573/0x15c0 net/xdp/xsk_diag.c:163 netlink_dump+0x588/0xca0 net/netlink/af_netlink.c:2269 __netlink_dump_start+0x6d0/0x9c0 net/netlink/af_netlink.c:2376 netlink_dump_start include/linux/netlink.h:330 [inline] xsk_diag_handler_dump+0x1a6/0x240 net/xdp/xsk_diag.c:190 __sock_diag_cmd net/core/sock_diag.c:238 [inline] sock_diag_rcv_msg+0x316/0x440 net/core/sock_diag.c:269 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2549 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:280 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x539/0x800 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x93c/0xe30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:748 sock_write_iter+0x29b/0x3d0 net/socket.c:1129 call_write_iter include/linux/fs.h:1877 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x830 fs/read_write.c:860 vfs_writev+0x221/0x700 fs/read_write.c:933 do_writev+0x285/0x370 fs/read_write.c:976 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fab2ec7cae9 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:00007fab2f9db0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fab2ed9bf80 RCX: 00007fab2ec7cae9 RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007fab2ecc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fab2ed9bf80 R15: 00007ffc867fa318 Allocated by task 24843: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:985 [inline] __kmalloc+0x5d/0x100 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x271/0x450 security/tomoyo/file.c:822 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:211 security_path_symlink+0x101/0x160 security/security.c:1747 do_symlinkat+0x120/0x310 fs/namei.c:4501 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 24843: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13f/0x190 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcc/0x2d0 mm/slab.c:3564 tomoyo_realpath_from_path+0x1a6/0x710 security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x271/0x450 security/tomoyo/file.c:822 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:211 security_path_symlink+0x101/0x160 security/security.c:1747 do_symlinkat+0x120/0x310 fs/namei.c:4501 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888079234000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 224 bytes inside of freed 4096-byte region [ffff888079234000, ffff888079235000) The buggy address belongs to the physical page: page:ffffea0001e48d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79234 head:ffffea0001e48d00 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x1() raw: 00fff00000010200 ffff888012840900 ffffea0001c29010 ffffea0000d77b90 raw: 0000000000000000 ffff888079234000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x342040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 24843, tgid 24843 (syz-executor.5), ts 2388224445401, free_ts 2388154307548 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x99/0x3a0 mm/slab.c:2550 cache_alloc_refill+0x294/0x3a0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3182 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x3c9/0x470 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x4c/0x100 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x271/0x450 security/tomoyo/file.c:822 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:211 security_path_symlink+0x101/0x160 security/security.c:1747 do_symlinkat+0x120/0x310 fs/namei.c:4501 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd 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+0x508/0xb90 mm/page_alloc.c:2348 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443 slab_destroy mm/slab.c:1608 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1628 cache_flusharray mm/slab.c:3341 [inline] ___cache_free+0x2b6/0x420 mm/slab.c:3404 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x4c/0x1b0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slab.c:3237 [inline] __kmem_cache_alloc_node+0x167/0x470 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x4c/0x100 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] inotify_handle_inode_event+0x1d1/0x660 fs/notify/inotify/inotify_fsnotify.c:96 fsnotify_handle_inode_event.isra.0+0x1d0/0x350 fs/notify/fsnotify.c:264 fsnotify_handle_event fs/notify/fsnotify.c:316 [inline] send_to_group fs/notify/fsnotify.c:364 [inline] fsnotify+0x12f5/0x1af0 fs/notify/fsnotify.c:570 __fsnotify_parent+0x5ef/0xa10 fs/notify/fsnotify.c:230 fsnotify_parent include/linux/fsnotify.h:77 [inline] fsnotify_file include/linux/fsnotify.h:101 [inline] fsnotify_close include/linux/fsnotify.h:343 [inline] __fput+0x2ff/0xac0 fs/file_table.c:370 task_work_run+0x14d/0x240 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 Memory state around the buggy address: ffff888079233f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079234000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888079234080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888079234100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888079234180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================