From: Maximilian Luz <luzmaximilian@gmail.com>
To: Kees Cook <keescook@chromium.org>
Cc: Bjorn Andersson <andersson@kernel.org>,
Andy Gross <agross@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Ard Biesheuvel <ardb@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Johan Hovold <johan@kernel.org>,
Steev Klimaszewski <steev@kali.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/4] lib/ucs2_string: Add UCS-2 strlcpy function
Date: Tue, 30 May 2023 18:15:06 +0200 [thread overview]
Message-ID: <3255010d-82d5-e8e8-2e11-7de25d538d72@gmail.com> (raw)
In-Reply-To: <202305300820.9B2154B@keescook>
On 5/30/23 17:25, Kees Cook wrote:
> On Mon, May 29, 2023 at 01:03:48AM +0200, Maximilian Luz wrote:
>> Add a ucs2_strlcpy() function for UCS-2 strings. The behavior is
>> equivalent to the standard strlcpy() function, just for 16-bit character
>> UCS-2 strings.
>
> Eek, no. strlcpy() is dangerous in multiple ways[1]. Please implement
> strscpy() (i.e. use strnlen(), negative error on truncation, etc).
Right, make sense, thanks. Somehow I missed that the kernel has a better
function than the C stdlib for that...
> Additionally, it'd be nice of the ucs2 helpers here also implemented the
> rest of the CONFIG_FORTIFY_SOURCE mitigations (i.e. checking for source
> and destination buffer size overflows at compile-time and run-time with
> __builtin_object_size() and __builtin_dynamoc_object_size() respectively).
I can certainly try that, but I think this might be better suited for a
follow-up series, given that we then should also add those to the other
helpers.
Regards,
Max
next prev parent reply other threads:[~2023-05-30 16:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-28 23:03 [PATCH v4 0/4] firmware: Add support for Qualcomm UEFI Secure Application Maximilian Luz
2023-05-28 23:03 ` [PATCH v4 1/4] lib/ucs2_string: Add UCS-2 strlcpy function Maximilian Luz
2023-05-30 15:25 ` Kees Cook
2023-05-30 16:15 ` Maximilian Luz [this message]
2023-05-30 16:17 ` Ard Biesheuvel
2023-05-30 23:18 ` Kees Cook
2023-05-28 23:03 ` [PATCH v4 2/4] firmware: qcom_scm: Clear scm pointer on probe failure Maximilian Luz
2023-06-28 11:20 ` Johan Hovold
2023-07-20 18:55 ` Maximilian Luz
2023-05-28 23:03 ` [PATCH v4 3/4] firmware: qcom_scm: Add support for Qualcomm Secure Execution Environment SCM interface Maximilian Luz
2023-06-28 12:11 ` Johan Hovold
2023-06-28 12:50 ` Johan Hovold
2023-07-20 19:27 ` Maximilian Luz
2023-07-20 19:16 ` Maximilian Luz
2023-05-28 23:03 ` [PATCH v4 4/4] firmware: Add support for Qualcomm UEFI Secure Application Maximilian Luz
2023-06-29 12:12 ` Johan Hovold
2023-07-20 19:33 ` Maximilian Luz
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=3255010d-82d5-e8e8-2e11-7de25d538d72@gmail.com \
--to=luzmaximilian@gmail.com \
--cc=agross@kernel.org \
--cc=andersson@kernel.org \
--cc=ardb@kernel.org \
--cc=ilias.apalodimas@linaro.org \
--cc=johan@kernel.org \
--cc=keescook@chromium.org \
--cc=konrad.dybcio@linaro.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=srinivas.kandagatla@linaro.org \
--cc=steev@kali.org \
--cc=sudeep.holla@arm.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