Re: [syzbot] WARNING: kmalloc bug in hash_ipportip_create

[Dmitry Vyukov]

On Mon, 13 Sept 2021 at 18:29, syzbot
<syzbot+30aea515bdd9616dd4e9@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    bf9f243f23e6 Merge tag '5.15-rc-ksmbd-part2' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=123479c7300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=37df9ef5660a8387
> dashboard link: https://syzkaller.appspot.com/bug?extid=30aea515bdd9616dd4e9
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167a5873300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1080c163300000
>
> The issue was bisected to:
>
> commit 7661809d493b426e979f39ab512e3adf41fbcc69
> Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Date:   Wed Jul 14 16:45:49 2021 +0000
>
>     mm: don't allow oversized kvmalloc() calls
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14e9083b300000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16e9083b300000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12e9083b300000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+30aea515bdd9616dd4e9@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 7661809d493b ("mm: don't allow oversized kvmalloc() calls")

#syz dup: WARNING: kmalloc bug in hash_net_create

> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 6538 at mm/util.c:597 kvmalloc_node+0x111/0x120 mm/util.c:597
> Modules linked in:
> CPU: 1 PID: 6538 Comm: syz-executor249 Not tainted 5.14.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:kvmalloc_node+0x111/0x120 mm/util.c:597
> Code: 01 00 00 00 4c 89 e7 e8 8d 18 0d 00 49 89 c5 e9 69 ff ff ff e8 10 9d d0 ff 41 89 ed 41 81 cd 00 20 01 00 eb 95 e8 ff 9c d0 ff <0f> 0b e9 4c ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 e6
> RSP: 0018:ffffc900025af268 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffc900025af380 RCX: 0000000000000000
> RDX: ffff888025433900 RSI: ffffffff81a57041 RDI: 0000000000000003
> RBP: 0000000000400dc0 R08: 000000007fffffff R09: ffff8880b9d32a0b
> R10: ffffffff81a56ffe R11: 000000000000001f R12: 0000000400000018
> R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88807bbce000
> FS:  0000000001a7d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f7269e1d6c0 CR3: 000000006f6c6000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  hash_ipportip_create+0x3dd/0x1220 net/netfilter/ipset/ip_set_hash_gen.h:1524
>  ip_set_create+0x782/0x15a0 net/netfilter/ipset/ip_set_core.c:1100
>  nfnetlink_rcv_msg+0xbc9/0x13f0 net/netfilter/nfnetlink.c:296
>  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
>  nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:654
>  netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
>  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
>  netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
>  sock_sendmsg_nosec net/socket.c:704 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:724
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
>  __sys_sendmsg+0xf3/0x1c0 net/socket.c:2492
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x43f029
> Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffd69914258 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f029
> RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
> RBP: 0000000000403010 R08: 0000000000000005 R09: 0000000000400488
> R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004030a0
> R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488
>
>
> ---
> 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@xxxxxxxxxxxxxxxx.
>
> 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
>
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