SELinux: policydb string length 1287913480 does not match expected length 8 SELinux: policydb string length 1287913480 does not match expected length 8 ================================================================== BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:798 [inline] BUG: KASAN: use-after-free in tcp_init_tso_segs net/ipv4/tcp_output.c:1631 [inline] BUG: KASAN: use-after-free in tcp_write_xmit+0x3b22/0x4680 net/ipv4/tcp_output.c:2068 Read of size 2 at addr ffff8800bae1c2b0 by task syz-executor3/5246 CPU: 0 PID: 5246 Comm: syz-executor3 Not tainted 4.4.163+ #122 0000000000000000 377140e2e34f7429 ffff8801bb5478d0 ffffffff81aa556d ffffea0002eb8700 ffff8800bae1c2b0 0000000000000000 ffff8800bae1c2b0 dffffc0000000000 ffff8801bb547908 ffffffff8148a8db ffff8800bae1c2b0 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x6c/0x217 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report.cold.6+0x175/0x2f7 mm/kasan/report.c:408 [] __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:427 [] tcp_skb_pcount include/net/tcp.h:798 [inline] [] tcp_init_tso_segs net/ipv4/tcp_output.c:1631 [inline] [] tcp_write_xmit+0x3b22/0x4680 net/ipv4/tcp_output.c:2068 [] __tcp_push_pending_frames+0xa4/0x2a0 net/ipv4/tcp_output.c:2319 [] tcp_sendmsg+0x21a3/0x2b30 net/ipv4/tcp.c:1272 [] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbb/0x110 net/socket.c:648 [] SYSC_sendto net/socket.c:1678 [inline] [] SyS_sendto+0x220/0x370 net/socket.c:1646 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Allocated by task 5246: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack mm/kasan/kasan.c:512 [inline] [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:616 [] kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:601 [] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554 [] slab_post_alloc_hook mm/slub.c:1349 [inline] [] slab_alloc_node mm/slub.c:2615 [inline] [] slab_alloc mm/slub.c:2623 [inline] [] kmem_cache_alloc+0xdc/0x2c0 mm/slub.c:2628 [] kmem_cache_alloc_node include/linux/slab.h:350 [inline] [] __alloc_skb+0xe6/0x5b0 net/core/skbuff.c:218 [] alloc_skb_fclone include/linux/skbuff.h:856 [inline] [] sk_stream_alloc_skb+0xa3/0x5d0 net/ipv4/tcp.c:833 [] tcp_sendmsg+0xf81/0x2b30 net/ipv4/tcp.c:1178 [] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbb/0x110 net/socket.c:648 [] SYSC_sendto net/socket.c:1678 [inline] [] SyS_sendto+0x220/0x370 net/socket.c:1646 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Freed by task 5248: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack mm/kasan/kasan.c:512 [inline] [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kmem_cache_free+0xbe/0x350 mm/slub.c:2881 [] kfree_skbmem+0xcf/0x100 net/core/skbuff.c:635 [] __kfree_skb+0x1d/0x20 net/core/skbuff.c:676 [] sk_wmem_free_skb include/net/sock.h:1447 [inline] [] tcp_write_queue_purge include/net/tcp.h:1460 [inline] [] tcp_connect_init net/ipv4/tcp_output.c:3134 [inline] [] tcp_connect+0xae9/0x3110 net/ipv4/tcp_output.c:3273 [] tcp_v4_connect+0xf31/0x1890 net/ipv4/tcp_ipv4.c:246 [] __inet_stream_connect+0x2a9/0xc30 net/ipv4/af_inet.c:615 [] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:676 [] SYSC_connect net/socket.c:1570 [inline] [] SyS_connect+0x1b8/0x310 net/socket.c:1551 [] entry_SYSCALL_64_fastpath+0x1e/0x9a The buggy address belongs to the object at ffff8800bae1c280 which belongs to the cache skbuff_fclone_cache of size 456 The buggy address is located 48 bytes inside of 456-byte region [ffff8800bae1c280, ffff8800bae1c448) The buggy address belongs to the page: double fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 5246 Comm: syz-executor3 Not tainted 4.4.163+ #122 task: ffff8800a678c740 task.stack: ffff8801bb540000 RIP: 0010:[] [] dump_page_badflags+0x1a/0x70 mm/debug.c:84 RSP: 0018:ffff880100000000 EFLAGS: 00010086 RAX: 0000000000040000 RBX: ffffea0002eb8700 RCX: ffffc9000112d000 RDX: 0000000000000000 RSI: ffffffff828912a0 RDI: ffffea0002eb8700 RBP: ffff880100000030 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff83fd7174 R12: 0000000000000000 R13: ffffffff828912a0 R14: ffff8800bae1c280 R15: ffff8800bae1c448 FS: 00007f06b0247700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8800fffffff8 CR3: 00000000ba7dd000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: Call Trace: Code: df e8 7b 97 05 00 eb dd 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec 08 c1 10 ee ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea RIP [] dump_page_badflags+0x1a/0x70 mm/debug.c:84 RSP ---[ end trace daeafe4002f5d39d ]---