================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: use-after-free in sock_cgroup_ptr include/linux/cgroup.h:836 [inline] BUG: KASAN: use-after-free in inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 Read of size 8 at addr ffff88805f350200 by task syz-executor.4/12476 CPU: 1 PID: 12476 Comm: syz-executor.4 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 __read_once_size include/linux/compiler.h:199 [inline] sock_cgroup_ptr include/linux/cgroup.h:836 [inline] inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 inet_diag_dump_icsk+0xbe4/0x1306 net/ipv4/inet_diag.c:1061 __inet_diag_dump+0x8d/0x240 net/ipv4/inet_diag.c:1113 netlink_dump+0x50b/0xf50 net/netlink/af_netlink.c:2245 __netlink_dump_start+0x63f/0x910 net/netlink/af_netlink.c:2353 netlink_dump_start include/linux/netlink.h:246 [inline] inet_diag_handler_cmd+0x263/0x2c0 net/ipv4/inet_diag.c:1278 __sock_diag_cmd net/core/sock_diag.c:233 [inline] sock_diag_rcv_msg+0x2fe/0x3e0 net/core/sock_diag.c:264 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:275 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_write_iter+0x289/0x3c0 net/socket.c:1004 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x5a8/0x850 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x18b/0x600 fs/read_write.c:980 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1072 do_writev+0x27f/0x300 fs/read_write.c:1115 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f50c3ab8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000004 RSI: 0000000020000200 RDI: 0000000000000008 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007f50c3ab96d4 Allocated by task 11893: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] tomoyo_environ security/tomoyo/domain.c:635 [inline] tomoyo_find_next_domain+0xb33/0x1f6c security/tomoyo/domain.c:881 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:107 [inline] tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:97 security_bprm_check+0x5c/0xb0 security/security.c:835 search_binary_handler+0x70/0x590 fs/exec.c:1705 exec_binprm fs/exec.c:1761 [inline] __do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1881 do_execveat_common fs/exec.c:1927 [inline] do_execve+0x2e/0x40 fs/exec.c:1944 call_usermodehelper_exec_async+0x588/0x710 kernel/umh.c:112 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 11893: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 tomoyo_environ security/tomoyo/domain.c:690 [inline] tomoyo_find_next_domain+0x13f7/0x1f6c security/tomoyo/domain.c:881 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:107 [inline] tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:97 security_bprm_check+0x5c/0xb0 security/security.c:835 search_binary_handler+0x70/0x590 fs/exec.c:1705 exec_binprm fs/exec.c:1761 [inline] __do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1881 do_execveat_common fs/exec.c:1927 [inline] do_execve+0x2e/0x40 fs/exec.c:1944 call_usermodehelper_exec_async+0x588/0x710 kernel/umh.c:112 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88805f350000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 512 bytes inside of 4096-byte region [ffff88805f350000, ffff88805f351000) The buggy address belongs to the page: page:ffffea00017cd400 refcount:1 mapcount:0 mapping:00000000ac4bdcd5 index:0x0 head:ffffea00017cd400 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00016f8788 ffffea000173d708 ffff8880aa002000 raw: 0000000000000000 ffff88805f350000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805f350100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f350180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f350200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f350280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f350300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================