netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. ================================================================== BUG: KASAN: use-after-free in xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] BUG: KASAN: use-after-free in xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] BUG: KASAN: use-after-free in xsk_diag_dump+0x1477/0x1540 net/xdp/xsk_diag.c:163 Read of size 4 at addr ffff88810d7f80d8 by task syz-executor.0/2031 CPU: 1 PID: 2031 Comm: syz-executor.0 Not tainted 5.17.0-rc5-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+0x40/0x5c lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x328 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] xsk_diag_dump+0x1477/0x1540 net/xdp/xsk_diag.c:163 netlink_dump+0x41e/0xab0 net/netlink/af_netlink.c:2268 __netlink_dump_start+0x56f/0x810 net/netlink/af_netlink.c:2373 netlink_dump_start include/linux/netlink.h:254 [inline] xsk_diag_handler_dump+0x163/0x210 net/xdp/xsk_diag.c:190 __sock_diag_cmd net/core/sock_diag.c:235 [inline] sock_diag_rcv_msg+0x295/0x370 net/core/sock_diag.c:266 netlink_rcv_skb+0x125/0x380 net/netlink/af_netlink.c:2494 sock_diag_rcv+0x21/0x30 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x418/0x720 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x7ab/0xc40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xae/0xe0 net/socket.c:725 sock_write_iter+0x213/0x370 net/socket.c:1061 call_write_iter include/linux/fs.h:2074 [inline] do_iter_readv_writev+0x390/0x710 fs/read_write.c:725 do_iter_write+0x128/0x6a0 fs/read_write.c:851 vfs_writev+0x1da/0x4e0 fs/read_write.c:924 do_writev+0x20f/0x2c0 fs/read_write.c:967 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x557a7badcae9 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:00007f85d5d7d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000557a7bbfbf80 RCX: 0000557a7badcae9 RDX: 0000000000000001 RSI: 00000000200003c0 RDI: 0000000000000006 RBP: 0000557a7bb2847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 0000557a7bbfbf80 R15: 00007ffcf5f61fb8 Allocated by task 1801: kasan_save_stack+0x2f/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc+0xa7/0xd0 mm/kasan/common.c:524 kvmalloc include/linux/slab.h:731 [inline] kvzalloc include/linux/slab.h:739 [inline] alloc_netdev_mqs+0x5a/0xf40 net/core/dev.c:10163 rtnl_create_link+0x8e1/0xc10 net/core/rtnetlink.c:3204 veth_newlink+0x1f9/0x980 drivers/net/veth.c:1678 __rtnl_newlink+0xd28/0x1440 net/core/rtnetlink.c:3483 rtnl_newlink+0x59/0x90 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x394/0x900 net/core/rtnetlink.c:5596 netlink_rcv_skb+0x125/0x380 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x418/0x720 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x7ab/0xc40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xae/0xe0 net/socket.c:725 __sys_sendto+0x1c4/0x280 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xd7/0x1b0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 2031: kasan_save_stack+0x2f/0x50 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:366 [inline] ____kasan_slab_free+0x11c/0x170 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xae/0x1e0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xc9/0x4f0 mm/slub.c:4562 device_release+0x93/0x190 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put.part.0+0x167/0x3e0 lib/kobject.c:753 netdev_run_todo+0x6b3/0xa10 net/core/dev.c:9973 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x39c/0x900 net/core/rtnetlink.c:5597 netlink_rcv_skb+0x125/0x380 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x418/0x720 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x7ab/0xc40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xae/0xe0 net/socket.c:725 ____sys_sendmsg+0x601/0x810 net/socket.c:2413 ___sys_sendmsg+0xf4/0x170 net/socket.c:2467 __sys_sendmsg+0xd0/0x170 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88810d7f8000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 216 bytes inside of 4096-byte region [ffff88810d7f8000, ffff88810d7f9000) The buggy address belongs to the page: page:ffffea000435fe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d7f8 head:ffffea000435fe00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 0000000000000000 dead000000000001 ffff88810004c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1182, ts 6610792588, free_ts 6608130319 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x158/0x200 mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x12a2/0x2fa0 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x480 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x27c/0x3a0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8a5/0xe50 mm/slub.c:3018 __slab_alloc.constprop.0+0x45/0x80 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] __kmalloc_node+0x192/0x4f0 mm/slub.c:4468 kvmalloc include/linux/slab.h:731 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x68c/0x10e0 fs/seq_file.c:210 call_read_iter include/linux/fs.h:2068 [inline] new_sync_read+0x3c6/0x640 fs/read_write.c:400 vfs_read+0x204/0x480 fs/read_write.c:481 ksys_read+0x101/0x1d0 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x33c/0x710 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x520 mm/page_alloc.c:3404 __unfreeze_partials+0x2ff/0x320 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6d/0x160 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x176/0x1a0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x249/0x3b0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] kernfs_fop_open+0x2a1/0xc30 fs/kernfs/file.c:628 do_dentry_open+0x5e1/0xeb0 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x19f0/0x2840 fs/namei.c:3609 do_filp_open+0x1b1/0x400 fs/namei.c:3636 do_sys_openat2+0x137/0x410 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x130/0x1d0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88810d7f7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810d7f8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810d7f8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810d7f8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810d7f8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================