Messages in this thread | | | Date | Sun, 10 Jun 2018 08:27:02 -0700 | Subject | KASAN: slab-out-of-bounds Read in bpf_skb_change_proto | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: a16afaf7928b Merge tag 'for-v4.18' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1338f6bf800000 kernel config: https://syzkaller.appspot.com/x/.config?x=314f2150f36c16ca dashboard link: https://syzkaller.appspot.com/bug?extid=d2d729bdde65dee3eae6 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1173381f800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171f90cf800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d2d729bdde65dee3eae6@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in bpf_skb_proto_xlat net/core/filter.c:2637 [inline] BUG: KASAN: slab-out-of-bounds in ____bpf_skb_change_proto net/core/filter.c:2675 [inline] BUG: KASAN: slab-out-of-bounds in bpf_skb_change_proto+0xe37/0x1300 net/core/filter.c:2650 Read of size 2 at addr ffff8801b04646c0 by task syz-executor241/4519
CPU: 0 PID: 4519 Comm: syz-executor241 Not tainted 4.17.0+ #93 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+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 bpf_skb_proto_xlat net/core/filter.c:2637 [inline] ____bpf_skb_change_proto net/core/filter.c:2675 [inline] bpf_skb_change_proto+0xe37/0x1300 net/core/filter.c:2650
Allocated by task 0: (stack is not available)
Freed by task 0: (stack is not available)
The buggy address belongs to the object at ffff8801b04646c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff8801b04646c0, ffff8801b04647a8) The buggy address belongs to the page: page:ffffea0006c11900 count:1 mapcount:0 mapping:ffff8801d9a0d080 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006c49388 ffffea0006ae5c48 ffff8801d9a0d080 raw: 0000000000000000 ffff8801b0464080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8801b0464580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801b0464600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801b0464680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801b0464700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801b0464780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
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