All of lore.kernel.org
 help / color / mirror / Atom feed
From: syzbot <syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, coreteam@netfilter.org,
	davem@davemloft.net, fw@strlen.de, jakub@redhat.com,
	jiangshanlai@gmail.com, kadlec@netfilter.org, kuba@kernel.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	netfilter-devel@vger.kernel.org, pablo@netfilter.org,
	peterz@infradead.org, syzkaller-bugs@googlegroups.com,
	tj@kernel.org, torvalds@linux-foundation.org
Subject: kernel BUG at lib/string.c:LINE! (6)
Date: Tue, 22 Dec 2020 06:44:18 -0800	[thread overview]
Message-ID: <000000000000fcbe0705b70e9bd9@google.com> (raw)

Hello,

syzbot found the following issue on:

HEAD commit:    d64c6f96 Merge tag 'net-5.11-rc1' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10bc5613500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aca0dc5c721fe9e5
dashboard link: https://syzkaller.appspot.com/bug?extid=e86f7c428c8c50db65b4
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169378a7500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=144692cb500000

The issue was bisected to:

commit 2f78788b55baa3410b1ec91a576286abe1ad4d6a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Dec 16 04:43:37 2020 +0000

    ilog2: improve ilog2 for constant arguments

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1584f137500000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1784f137500000
console output: https://syzkaller.appspot.com/x/log.txt?x=1384f137500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com
Fixes: 2f78788b55ba ("ilog2: improve ilog2 for constant arguments")

detected buffer overflow in strlen
------------[ cut here ]------------
kernel BUG at lib/string.c:1149!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8713 Comm: syz-executor731 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fortify_panic+0xf/0x11 lib/string.c:1149
Code: b5 78 a3 04 48 c7 c7 c0 8f c2 89 58 5b 5d 41 5c 41 5d 41 5e 41 5f e9 30 ba ee ff 48 89 fe 48 c7 c7 80 90 c2 89 e8 21 ba ee ff <0f> 0b e8 90 f9 97 f8 0f b6 f3 48 c7 c7 20 f4 10 8c e8 41 e8 fc fa
RSP: 0018:ffffc900020af500 EFLAGS: 00010282
RAX: 0000000000000022 RBX: ffff888011c26768 RCX: 0000000000000000
RDX: ffff88801bad0000 RSI: ffffffff815a6925 RDI: fffff52000415e92
RBP: ffff88801be7c220 R08: 0000000000000022 R09: 0000000000000000
R10: ffffffff815a4d7b R11: 0000000000000000 R12: ffff88801180ec00
R13: ffff888011c26700 R14: 1ffff92000415ea2 R15: 0000000000000010
FS:  0000000000812880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006dcf60 CR3: 00000000141ee000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strlen include/linux/string.h:325 [inline]
 strlcpy include/linux/string.h:348 [inline]
 xt_rateest_tg_checkentry+0x2a5/0x6b0 net/netfilter/xt_RATEEST.c:143
 xt_check_target+0x26c/0x9e0 net/netfilter/x_tables.c:1019
 check_target net/ipv6/netfilter/ip6_tables.c:529 [inline]
 find_check_entry.constprop.0+0x7f1/0x9e0 net/ipv6/netfilter/ip6_tables.c:572
 translate_table+0xc8b/0x1750 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline]
 do_ip6t_set_ctl+0x553/0xb70 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x136/0x2440 net/ipv4/tcp.c:3597
 __sys_setsockopt+0x2db/0x610 net/socket.c:2115
 __do_sys_setsockopt net/socket.c:2126 [inline]
 __se_sys_setsockopt net/socket.c:2123 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2123
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4493d9
Code: e8 0c ca 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 9b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff679a3898 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000200002c0 RCX: 00000000004493d9
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000006
RBP: 00007fff679a38b0 R08: 0000000000000470 R09: 00000000000000c2
R10: 0000000020000080 R11: 0000000000000246 R12: 00000000000112d5
R13: 00000000006d7dc8 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e17a915ca7e8b666 ]---
RIP: 0010:fortify_panic+0xf/0x11 lib/string.c:1149
Code: b5 78 a3 04 48 c7 c7 c0 8f c2 89 58 5b 5d 41 5c 41 5d 41 5e 41 5f e9 30 ba ee ff 48 89 fe 48 c7 c7 80 90 c2 89 e8 21 ba ee ff <0f> 0b e8 90 f9 97 f8 0f b6 f3 48 c7 c7 20 f4 10 8c e8 41 e8 fc fa
RSP: 0018:ffffc900020af500 EFLAGS: 00010282
RAX: 0000000000000022 RBX: ffff888011c26768 RCX: 0000000000000000
RDX: ffff88801bad0000 RSI: ffffffff815a6925 RDI: fffff52000415e92
RBP: ffff88801be7c220 R08: 0000000000000022 R09: 0000000000000000
R10: ffffffff815a4d7b R11: 0000000000000000 R12: ffff88801180ec00
R13: ffff888011c26700 R14: 1ffff92000415ea2 R15: 0000000000000010
FS:  0000000000812880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006dcf60 CR3: 00000000141ee000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

             reply	other threads:[~2020-12-22 14:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-22 14:44 syzbot [this message]
2020-12-22 22:01 ` kernel BUG at lib/string.c:LINE! (6) Linus Torvalds
2020-12-22 22:07   ` Florian Westphal
2020-12-23 11:25     ` Dmitry Vyukov
2020-12-22 22:23 ` [PATCH nf] netfilter: xt_RATEEST: reject non-null terminated string from userspace Florian Westphal
2020-12-22 22:29   ` Linus Torvalds
2020-12-22 22:50     ` Florian Westphal
2020-12-27 10:53   ` Pablo Neira Ayuso

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=000000000000fcbe0705b70e9bd9@google.com \
    --to=syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=coreteam@netfilter.org \
    --cc=davem@davemloft.net \
    --cc=fw@strlen.de \
    --cc=jakub@redhat.com \
    --cc=jiangshanlai@gmail.com \
    --cc=kadlec@netfilter.org \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=netfilter-devel@vger.kernel.org \
    --cc=pablo@netfilter.org \
    --cc=peterz@infradead.org \
    --cc=syzkaller-bugs@googlegroups.com \
    --cc=tj@kernel.org \
    --cc=torvalds@linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.