audit: type=1400 audit(1540511784.284:36): avc: denied { map } for pid=5526 comm="syz-executor435" path="/root/syz-executor435209504" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline] BUG: KASAN: slab-out-of-bounds in sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582 Read of size 8 at addr ffff8801ca1ff168 by task syz-executor435/5529 CPU: 1 PID: 5529 Comm: syz-executor435 Not tainted 4.19.0+ #82 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline] sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2937 __sys_getsockopt+0x1ad/0x390 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt net/socket.c:1947 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1947 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445789 Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff683eb6db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000445789 RDX: 0000000000000074 RSI: 0000000000000084 RDI: 0000000000000003 RBP: 00000000006dac40 R08: 0000000020000040 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000006dac4c R13: 00007ffedd6edd7f R14: 00007ff683eb79c0 R15: 00000000006dad2c Allocated by task 5528: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] sctp_stream_init_ext+0x4f/0xf0 net/sctp/stream.c:237 sctp_sendmsg_to_asoc+0x1308/0x1a20 net/sctp/socket.c:1896 sctp_sendmsg+0x13c2/0x1da0 net/sctp/socket.c:2113 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4060: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 free_rb_tree_fname+0x85/0xe0 fs/ext4/dir.c:404 ext4_htree_free_dir_info fs/ext4/dir.c:426 [inline] ext4_release_dir+0x44/0x60 fs/ext4/dir.c:624 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801ca1ff100 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 8 bytes to the right of 96-byte region [ffff8801ca1ff100, ffff8801ca1ff160) The buggy address belongs to the page: page:ffffea0007287fc0 count:1 mapcount:0 mapping:ffff8801da8004c0 index:0xffff8801ca1ff200 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea000728ac48 ffffea00071ea348 ffff8801da8004c0 raw: ffff8801ca1ff200 ffff8801ca1ff000 000000010000001b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ca1ff000: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8801ca1ff080: 00 00 00 00 00 00 00 00 05 fc fc fc fc fc fc fc >ffff8801ca1ff100: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ^ ffff8801ca1ff180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801ca1ff200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================