From: "Gao, Zhichao" <zhichao.gao@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>,
"Gao, Zhichao" <zhichao.gao@intel.com>,
"gechao@greatwall.com.cn" <gechao@greatwall.com.cn>,
"Wu, Hao A" <hao.a.wu@intel.com>,
"Wang, Jian J" <jian.j.wang@intel.com>
Cc: "Ni, Ray" <ray.ni@intel.com>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/TerminalDxe [BUG]: Terminal fifo buffer overflow.
Date: Fri, 15 Jan 2021 08:49:06 +0000 [thread overview]
Message-ID: <MWHPR11MB1647DDB390E8E567C7D428B3F6A70@MWHPR11MB1647.namprd11.prod.outlook.com> (raw)
In-Reply-To: <165A05B49BF7F07B.12403@groups.io>
Add Hao and Jian, who have the permission to merge the patch. CI result: https://github.com/tianocore/edk2/pull/1358
Thanks,
Zhichao
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Gao, Zhichao
> Sent: Thursday, January 14, 2021 2:35 PM
> To: gechao@greatwall.com.cn
> Cc: devel@edk2.groups.io; Ni, Ray <ray.ni@intel.com>
> Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/TerminalDxe [BUG]: Terminal
> fifo buffer overflow.
>
> There is no need to add [BUG] in the title. I would remove it when I create the PR.
> If you want to have a record for this bug, you can edit a Bugzilla and add the link
> in the commit message.
> Beside of that, Reviewed-by: Zhichao Gao <zhichao.gao@intel.com>
>
> Thanks,
> Zhichao
>
> > -----Original Message-----
> > From: gechao@greatwall.com.cn <gechao@greatwall.com.cn>
> > Sent: Thursday, January 14, 2021 11:23 AM
> > To: Gao, Zhichao <zhichao.gao@intel.com>
> > Cc: devel@edk2.groups.io; Ni, Ray <ray.ni@intel.com>; gechao
> > <gechao@greatwall.com.cn>
> > Subject: [PATCH] MdeModulePkg/TerminalDxe [BUG]: Terminal fifo buffer
> > overflow.
> >
> > From: gechao <gechao@greatwall.com.cn>
> >
> > Fix the bug of terminal fifo buffer overflow with UINT8 type.
> >
> > typedef struct {
> > UINT8 Head;
> > UINT8 Tail;
> > UINT8 Data[RAW_FIFO_MAX_NUMBER + 1]; } RAW_DATA_FIFO;
> > RAW_FIFO_MAX_NUMBER is 256.
> > the data buffer size is 257 (Index from 0 to 256), but the max value
> > of the index, Head or Tail (UINT8), is 255. That means the last data
> > of the data buffer would be always empty if we use Head/Tail to
> > output/input the data correctly. And because of the incorrect buffer
> > size the FIFO full check "((Tail + 1) % (RAW_FIFO_MAX_NUMBER + 1)) == Head"
> would never meet.
> >
> > Signed-off-by: gechao <gechao@greatwall.com.cn>
> > ---
> > MdeModulePkg/Universal/Console/TerminalDxe/Terminal.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.h
> > b/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.h
> > index 378ace13ce..360e58e847 100644
> > --- a/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.h
> > +++ b/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.h
> > @@ -37,7 +37,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
> > #include <Library/BaseLib.h> -#define RAW_FIFO_MAX_NUMBER 256+#define
> > RAW_FIFO_MAX_NUMBER 255 #define FIFO_MAX_NUMBER 128 typedef
> > struct {--
> > 2.25.1
>
>
>
>
>
next prev parent reply other threads:[~2021-01-15 8:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-14 3:22 [PATCH] MdeModulePkg/TerminalDxe [BUG]: Terminal fifo buffer overflow gechao
2021-01-14 6:34 ` Gao, Zhichao
[not found] ` <165A05B49BF7F07B.12403@groups.io>
2021-01-15 8:49 ` Gao, Zhichao [this message]
2021-01-15 8:53 ` [edk2-devel] " Wu, Hao A
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-list 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=MWHPR11MB1647DDB390E8E567C7D428B3F6A70@MWHPR11MB1647.namprd11.prod.outlook.com \
--to=devel@edk2.groups.io \
/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