From: Johannes Berg <johannes@sipsolutions.net>
To: Kees Cook <keescook@chromium.org>
Cc: Luca Coelho <luciano.coelho@intel.com>,
Haim Dreyfuss <haim.dreyfuss@intel.com>,
Miri Korenblit <miriam.rachel.korenblit@intel.com>,
Petr Stourac <pstourac@redhat.com>,
linux-kernel@vger.kernel.org,
Mordechay Goodstein <mordechay.goodstein@intel.com>,
Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Nathan Errera <nathan.errera@intel.com>,
Paolo Abeni <pabeni@redhat.com>,
Shaul Triebitz <shaul.triebitz@intel.com>,
netdev@vger.kernel.org,
Gregory Greenman <gregory.greenman@intel.com>,
Abhishek Naik <abhishek.naik@intel.com>,
Jose Ignacio Tornos Martinez <jtornosm@redhat.com>,
Ayala Beker <ayala.beker@intel.com>,
"David S. Miller" <davem@davemloft.net>,
linux-wireless@vger.kernel.org,
Sriram R <quic_srirrama@quicinc.com>,
Kalle Valo <kvalo@kernel.org>,
Mike Golant <michael.golant@intel.com>,
Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
linux-next@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: Coverity: iwl_mvm_sec_key_add(): Memory - corruptions
Date: Tue, 22 Nov 2022 17:46:09 +0100 [thread overview]
Message-ID: <1d3a2fafcc14de7406fd689029277fd74ed3ce87.camel@sipsolutions.net> (raw)
In-Reply-To: <202211181424.794FCAD@keescook>
On Fri, 2022-11-18 at 14:25 -0800, Kees Cook wrote:
> On Fri, Nov 18, 2022 at 10:04:38PM +0100, Johannes Berg wrote:
> > On Fri, 2022-11-18 at 08:54 -0800, coverity-bot wrote:
> > >
> > > *** CID 1527370: Memory - corruptions (OVERRUN)
> > > drivers/net/wireless/intel/iwlwifi/mvm/mld-key.c:123 in iwl_mvm_sec_key_add()
> > > 117
> > > 118 if (WARN_ON(keyconf->keylen > sizeof(cmd.u.add.key)))
> > > 119 return -EINVAL;
> > > 120
> > > 121 if (keyconf->cipher == WLAN_CIPHER_SUITE_WEP40 ||
> > > 122 keyconf->cipher == WLAN_CIPHER_SUITE_WEP104)
> > > vvv CID 1527370: Memory - corruptions (OVERRUN)
> > > vvv Overrunning buffer pointed to by "cmd.u.add.key + 3" of 32 bytes by passing it to a function which accesses it at byte offset 34 using argument "keyconf->keylen" (which evaluates to 32). [Note: The source code implementation of the function has been overridden by a builtin model.]
> > > 123 memcpy(cmd.u.add.key + IWL_SEC_WEP_KEY_OFFSET, keyconf->key,
> > > 124 keyconf->keylen);
> > > 125 else
> > > 126 memcpy(cmd.u.add.key, keyconf->key, keyconf->keylen);
> > > 127
> > > 128 if (keyconf->cipher == WLAN_CIPHER_SUITE_TKIP) {
> > >
> > > If this is a false positive, please let us know so we can mark it as
> > > such, or teach the Coverity rules to be smarter. If not, please make
> > > sure fixes get into linux-next. :) For patches fixing this, please
> > > include these lines (but double-check the "Fixes" first):
> > >
> >
> > Well, I don't think you can teach coverity this easily, but the
> > WARN_ON() check there is not really meant to protect this - WEP keys
> > must have a length of either 5 or 13 bytes (40 or 104 bits!).
> >
> > So there's no issue here, but I'm not surprised that coverity wouldn't
> > be able to figure that out through the stack.
>
> Gotcha. And some other layer is doing the verification that cipher and
> keylen are correctly matched?
Yes, the key must come through cfg80211_validate_key_settings() at some
point.
johannes
prev parent reply other threads:[~2022-11-22 16:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-18 16:54 Coverity: iwl_mvm_sec_key_add(): Memory - corruptions coverity-bot
2022-11-18 21:04 ` Johannes Berg
2022-11-18 22:25 ` Kees Cook
2022-11-22 16:46 ` Johannes Berg [this message]
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=1d3a2fafcc14de7406fd689029277fd74ed3ce87.camel@sipsolutions.net \
--to=johannes@sipsolutions.net \
--cc=abhishek.naik@intel.com \
--cc=ayala.beker@intel.com \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=emmanuel.grumbach@intel.com \
--cc=gregory.greenman@intel.com \
--cc=gustavo@embeddedor.com \
--cc=haim.dreyfuss@intel.com \
--cc=jtornosm@redhat.com \
--cc=keescook@chromium.org \
--cc=kuba@kernel.org \
--cc=kvalo@kernel.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=luciano.coelho@intel.com \
--cc=michael.golant@intel.com \
--cc=miriam.rachel.korenblit@intel.com \
--cc=mordechay.goodstein@intel.com \
--cc=nathan.errera@intel.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=pstourac@redhat.com \
--cc=quic_srirrama@quicinc.com \
--cc=shaul.triebitz@intel.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).