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From: "Laszlo Ersek" <lersek@redhat.com>
To: edk2-devel-groups-io <devel@edk2.groups.io>
Cc: "Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
	"Jordan Justen" <jordan.l.justen@intel.com>,
	"Liming Gao" <liming.gao@intel.com>,
	"Marvin Häuser" <mhaeuser@outlook.de>,
	"Michael D Kinney" <michael.d.kinney@intel.com>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>,
	"Zhichao Gao" <zhichao.gao@intel.com>
Subject: Re: [edk2-devel] [PATCH 0/3] MdePkg, OvmfPkg: rewrite Base64Decode(), clean up call site
Date: Wed, 10 Jul 2019 11:20:37 +0200	[thread overview]
Message-ID: <eef88d13-a678-d25f-a70f-6719553c4c71@redhat.com> (raw)
In-Reply-To: <20190702102836.27589-1-lersek@redhat.com>

On 07/02/19 12:28, Laszlo Ersek wrote:
> Repo:   https://github.com/lersek/edk2.git
> Branch: base64_decode_bz1891
> 
> Base64Decode() has a number of issues; see
> 
> - <https://bugzilla.tianocore.org/show_bug.cgi?id=1891>
> 
> - and the mailing list discussion linked from
>   <https://bugzilla.tianocore.org/show_bug.cgi?id=1891#c6>.
> 
> In my opinion, rewriting Base64Decode() from scratch, using a different
> (state machine-based) approach is safer / more robust than attempting to
> identify and patch up individual problems in the current implementation.
> The emphasis of the proposed implementation is to reject invalid input;
> decoding valid input is kind of secondary. (This is the safe approach
> for all parsers that process untrusted input, in my opinion.)
> 
> My understanding is that unit tests for Base64Decode() already exist in
> some repository. While I tested the new implementation through OvmfPkg's
> EnrollDefaultKeys application -- which makes the sole calls to
> Base64Decode() in the open source edk2 tree -- I didn't run a unit test
> suite. Help with that (pointers to the test suite, or actual unit
> testing) would be highly appreciated.
> 
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Cc: Jordan Justen <jordan.l.justen@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Marvin Häuser <mhaeuser@outlook.de>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
> Cc: Zhichao Gao <zhichao.gao@intel.com>
> 
> Thanks
> Laszlo
> 
> Laszlo Ersek (3):
>   MdePkg/BaseLib: re-specify Base64Decode(), and add temporary stub impl
>   MdePkg/BaseLib: rewrite Base64Decode()
>   OvmfPkg/EnrollDefaultKeys: clean up Base64Decode() retval handling
> 
>  MdePkg/Include/Library/BaseLib.h              |  99 ++++-
>  MdePkg/Library/BaseLib/String.c               | 448 +++++++++++++-------
>  OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.c |  10 +-
>  3 files changed, 374 insertions(+), 183 deletions(-)
> 

Ping.

  parent reply	other threads:[~2019-07-10  9:20 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-02 10:28 [PATCH 0/3] MdePkg, OvmfPkg: rewrite Base64Decode(), clean up call site Laszlo Ersek
2019-07-02 10:28 ` [PATCH 1/3] MdePkg/BaseLib: re-specify Base64Decode(), and add temporary stub impl Laszlo Ersek
2019-07-16  8:38   ` Philippe Mathieu-Daudé
2019-07-16  9:41     ` Philippe Mathieu-Daudé
2019-07-16 14:14       ` Laszlo Ersek
2019-07-16 14:59         ` Philippe Mathieu-Daudé
2019-07-16 18:53           ` [edk2-devel] " Laszlo Ersek
2019-07-16 10:49   ` Laszlo Ersek
2019-07-16 14:56     ` Liming Gao
2019-07-16 17:15       ` Laszlo Ersek
2019-07-02 10:28 ` [PATCH 2/3] MdePkg/BaseLib: rewrite Base64Decode() Laszlo Ersek
2019-07-12  2:31   ` [edk2-devel] " Gao, Zhichao
2019-07-12 19:31     ` Laszlo Ersek
2019-07-15 15:22       ` Liming Gao
2019-07-15 21:56         ` Laszlo Ersek
2019-07-16  1:18           ` Gao, Zhichao
2019-07-16 10:48             ` Laszlo Ersek
2019-07-15 18:44   ` mhaeuser
2019-07-16  0:45     ` Laszlo Ersek
2019-07-16 10:05   ` Philippe Mathieu-Daudé
2019-07-16 14:17     ` Laszlo Ersek
2019-07-02 10:28 ` [PATCH 3/3] OvmfPkg/EnrollDefaultKeys: clean up Base64Decode() retval handling Laszlo Ersek
2019-07-15 21:58   ` [edk2-devel] " Laszlo Ersek
2019-07-16  8:36     ` Philippe Mathieu-Daudé
2019-07-10  9:20 ` Laszlo Ersek [this message]
2019-07-16 22:02 ` [edk2-devel] [PATCH 0/3] MdePkg, OvmfPkg: rewrite Base64Decode(), clean up call site Laszlo Ersek

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