linux-kernel - Re: [PATCH v2] net: mac802154: Fix general protection fault

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Message-ID: <CAB_54W6BmSuRo5pwGEH_Xug3Fo5cBMjmMAGjd3aaWJaGZpSsHQ@mail.gmail.com>
Date:   Sun, 4 Apr 2021 20:43:45 -0400
From:   Alexander Aring <alex.aring@...il.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        syzbot+9ec037722d2603a9f52e@...kaller.appspotmail.com
Subject: Re: [PATCH v2] net: mac802154: Fix general protection fault

Hi,

On Thu, 4 Mar 2021 at 10:25, Pavel Skripkin <paskripkin@...il.com> wrote:
>
> syzbot found general protection fault in crypto_destroy_tfm()[1].
> It was caused by wrong clean up loop in llsec_key_alloc().
> If one of the tfm array members is in IS_ERR() range it will
> cause general protection fault in clean up function [1].
>
> Call Trace:
>  crypto_free_aead include/crypto/aead.h:191 [inline] [1]
>  llsec_key_alloc net/mac802154/llsec.c:156 [inline]
>  mac802154_llsec_key_add+0x9e0/0xcc0 net/mac802154/llsec.c:249
>  ieee802154_add_llsec_key+0x56/0x80 net/mac802154/cfg.c:338
>  rdev_add_llsec_key net/ieee802154/rdev-ops.h:260 [inline]
>  nl802154_add_llsec_key+0x3d3/0x560 net/ieee802154/nl802154.c:1584
>  genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
>  genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
>  genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
>  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
>  genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
>  netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
>  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
>  netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
>  sock_sendmsg_nosec net/socket.c:654 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:674
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
>  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
>  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> Reported-by: syzbot+9ec037722d2603a9f52e@...kaller.appspotmail.com
> Change-Id: I29f7ac641a039096d63d1e6070bb32cb5a3beb07

I am sorry, I don't know the tag "Change-Id", I was doing a whole grep
on Documentation/ without any luck.

Dumb question: What is the meaning of it?

- Alex