KASAN: use-after-free Read in tomoyo_socket_sendmsg

Title	Replies (including bot)	Last reply
KASAN: use-after-free Read in tomoyo_socket_sendmsg_permission	3 (4)	2019/08/09 17:29

================================================================== BUG: KASAN: use-after-free in tomoyo_sock_family security/tomoyo/network.c:632 [inline] BUG: KASAN: use-after-free in tomoyo_socket_sendmsg_permission+0x37e/0x3cb security/tomoyo/network.c:762 Read of size 2 at addr ffff8880a066f410 by task syz-executor.3/2063 CPU: 1 PID: 2063 Comm: syz-executor.3 Not tainted 5.2.0+ #97 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:130 tomoyo_sock_family security/tomoyo/network.c:632 [inline] tomoyo_socket_sendmsg_permission+0x37e/0x3cb security/tomoyo/network.c:762 tomoyo_socket_sendmsg+0x26/0x30 security/tomoyo/tomoyo.c:486 security_socket_sendmsg+0x77/0xc0 security/security.c:1973 sock_sendmsg+0x45/0x130 net/socket.c:654 __sys_sendto+0x262/0x380 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1960 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8413a51c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829 RDX: 00000000000000ed RSI: 0000000020000280 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8413a526d4 R13: 00000000004c77f1 R14: 00000000004dcfc0 R15: 00000000ffffffff Allocated by task 0: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 mm/slab.c:3664 kmalloc include/linux/slab.h:557 [inline] sk_prot_alloc+0x23a/0x310 net/core/sock.c:1603 sk_alloc+0x39/0xf70 net/core/sock.c:1657 nr_make_new net/netrom/af_netrom.c:476 [inline] nr_rx_frame+0x733/0x1e73 net/netrom/af_netrom.c:959 nr_loopback_timer+0x7b/0x170 net/netrom/nr_loopback.c:59 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 Freed by task 2063: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 sk_prot_free net/core/sock.c:1640 [inline] __sk_destruct+0x4f7/0x6e0 net/core/sock.c:1726 sk_destruct+0x86/0xa0 net/core/sock.c:1734 __sk_free+0xfb/0x360 net/core/sock.c:1745 sk_free+0x42/0x50 net/core/sock.c:1756 sock_put include/net/sock.h:1725 [inline] sock_efree+0x61/0x80 net/core/sock.c:2042 skb_release_head_state+0xeb/0x250 net/core/skbuff.c:652 skb_release_all+0x16/0x60 net/core/skbuff.c:663 __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb net/core/skbuff.c:697 [inline] kfree_skb+0x101/0x3c0 net/core/skbuff.c:691 nr_accept+0x56e/0x700 net/netrom/af_netrom.c:819 __sys_accept4+0x34e/0x6a0 net/socket.c:1754 __do_sys_accept net/socket.c:1795 [inline] __se_sys_accept net/socket.c:1792 [inline] __x64_sys_accept+0x75/0xb0 net/socket.c:1792 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a066f400 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 16 bytes inside of 2048-byte region [ffff8880a066f400, ffff8880a066fc00) The buggy address belongs to the page: page:ffffea0002819b80 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001849388 ffffea000235a788 ffff8880aa400e00 raw: 0000000000000000 ffff8880a066e300 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a066f300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a066f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a066f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a066f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a066f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 2063 at lib/refcount.c:105 refcount_add_checked lib/refcount.c:105 [inline] WARNING: CPU: 1 PID: 2063 at lib/refcount.c:105 refcount_add_checked+0x6b/0x70 lib/refcount.c:103 Modules linked in: CPU: 1 PID: 2063 Comm: syz-executor.3 Tainted: G B 5.2.0+ #97 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:refcount_add_checked lib/refcount.c:105 [inline] RIP: 0010:refcount_add_checked+0x6b/0x70 lib/refcount.c:103 Code: 1d e7 77 64 06 31 ff 89 de e8 71 dc 35 fe 84 db 75 db e8 28 db 35 fe 48 c7 c7 20 08 c6 87 c6 05 c7 77 64 06 01 e8 1d 43 07 fe <0f> 0b eb bf 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 54 49 RSP: 0018:ffff88805d55f9f8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815c3a26 RDI: ffffed100baabf31 RBP: ffff88805d55fa10 R08: ffff888098124480 R09: fffffbfff1349ef0 R10: fffffbfff1349eef R11: ffffffff89a4f77f R12: 0000000000000500 R13: ffff8880a066f644 R14: ffff88808f271e60 R15: 00000000000000ed FS: 00007f8413a52700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000075c000 CR3: 0000000097173000 CR4: 00000000001406e0 Call Trace: skb_set_owner_w+0x216/0x320 net/core/sock.c:1991 sock_alloc_send_pskb+0x7c9/0x920 net/core/sock.c:2226 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2240 nr_sendmsg+0x557/0xb00 net/netrom/af_netrom.c:1094 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:657 __sys_sendto+0x262/0x380 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1960 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8413a51c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829 RDX: 00000000000000ed RSI: 0000000020000280 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8413a526d4 R13: 00000000004c77f1 R14: 00000000004dcfc0 R15: 00000000ffffffff irq event stamp: 344 hardirqs last enabled at (343): [<ffffffff8100a206>] do_syscall_64+0x26/0x6a0 arch/x86/entry/common.c:283 hardirqs last disabled at (344): [<ffffffff87391ddf>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (344): [<ffffffff87391ddf>] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (314): [<ffffffff858fb1b6>] spin_unlock_bh include/linux/spinlock.h:383 [inline] softirqs last enabled at (314): [<ffffffff858fb1b6>] release_sock+0x156/0x1c0 net/core/sock.c:2945 softirqs last disabled at (312): [<ffffffff858fb080>] spin_lock_bh include/linux/spinlock.h:343 [inline] softirqs last disabled at (312): [<ffffffff858fb080>] release_sock+0x20/0x1c0 net/core/sock.c:2932 ---[ end trace 2fe47c842e5d598a ]---