From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.115; helo=mga14.intel.com; envelope-from=jian.j.wang@intel.com; receiver=edk2-devel@lists.01.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 1050A21A1098A for ; Wed, 27 Dec 2017 16:24:19 -0800 (PST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Dec 2017 16:29:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,468,1508828400"; d="scan'208";a="5466106" Received: from fmsmsx105.amr.corp.intel.com ([10.18.124.203]) by fmsmga007.fm.intel.com with ESMTP; 27 Dec 2017 16:29:14 -0800 Received: from FMSMSX110.amr.corp.intel.com (10.18.116.10) by FMSMSX105.amr.corp.intel.com (10.18.124.203) with Microsoft SMTP Server (TLS) id 14.3.319.2; Wed, 27 Dec 2017 16:29:14 -0800 Received: from shsmsx151.ccr.corp.intel.com (10.239.6.50) by fmsmsx110.amr.corp.intel.com (10.18.116.10) with Microsoft SMTP Server (TLS) id 14.3.319.2; Wed, 27 Dec 2017 16:29:14 -0800 Received: from shsmsx103.ccr.corp.intel.com ([169.254.4.213]) by SHSMSX151.ccr.corp.intel.com ([169.254.3.218]) with mapi id 14.03.0319.002; Thu, 28 Dec 2017 08:29:12 +0800 From: "Wang, Jian J" To: "Kinney, Michael D" , "edk2-devel@lists.01.org" CC: "Yao, Jiewen" , "Zeng, Star" , "Gao, Liming" Thread-Topic: [edk2] [PATCH] MdePkg/BasePrintLib: Fix incorrect Precision position calculation Thread-Index: AQHTfSVj1FRHdxIRVUizEXTJjKZQf6NWdgFQgABrqQCAAQlioA== Date: Thu, 28 Dec 2017 00:29:12 +0000 Message-ID: References: <20171225020847.14076-1-jian.j.wang@intel.com> In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiZjliNGNjYmEtYzAwMC00YTNiLWE2NDgtZjJhOGFkODE1NzYyIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX05UIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE3LjIuNS4xOCIsIlRydXN0ZWRMYWJlbEhhc2giOiJCenZIdENneFZqUllwYXJ6ZFRKRHpxVDV4OUpTK2NybVNcL1VtZzQ4Q2hnb3U4UnY0RDIxaTdXbTdzVVVvQjBFKyJ9 x-ctpclassification: CTP_NT dlp-product: dlpe-windows dlp-version: 11.0.0.116 dlp-reaction: no-action x-originating-ip: [10.239.127.40] MIME-Version: 1.0 Subject: Re: [PATCH] MdePkg/BasePrintLib: Fix incorrect Precision position calculation X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Dec 2017 00:24:19 -0000 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I revisit the code again. You're right that the commit log is not correct. The '\0' would be read and even the one pass it. Regards, Jian > -----Original Message----- > From: Kinney, Michael D > Sent: Thursday, December 28, 2017 12:38 AM > To: Wang, Jian J ; edk2-devel@lists.01.org; Kinney= , > Michael D > Cc: Yao, Jiewen ; Zeng, Star ; > Gao, Liming > Subject: RE: [edk2] [PATCH] MdePkg/BasePrintLib: Fix incorrect Precision > position calculation >=20 > Is the commit log correct? >=20 > Is the issue that the character past the '\0' could be read? >=20 > Mike >=20 > > -----Original Message----- > > From: Wang, Jian J > > Sent: Tuesday, December 26, 2017 6:14 PM > > To: Wang, Jian J ; edk2- > > devel@lists.01.org > > Cc: Kinney, Michael D ; Yao, > > Jiewen ; Zeng, Star > > ; Gao, Liming > > Subject: RE: [edk2] [PATCH] MdePkg/BasePrintLib: Fix > > incorrect Precision position calculation > > > > Mike and Liming, > > > > Could you take a look at this patch? > > > > Regards, > > Jian > > > > > > > -----Original Message----- > > > From: edk2-devel [mailto:edk2-devel- > > bounces@lists.01.org] On Behalf Of Jian J > > > Wang > > > Sent: Monday, December 25, 2017 10:09 AM > > > To: edk2-devel@lists.01.org > > > Cc: Kinney, Michael D ; > > Yao, Jiewen > > > ; Zeng, Star > > ; Gao, Liming > > > > > > Subject: [edk2] [PATCH] MdePkg/BasePrintLib: Fix > > incorrect Precision position > > > calculation > > > > > > Due to the a potential hole in the stop condition of > > for-loop, the two > > > continuous access to ArgumentString (index, index+1) > > inside the loop > > > might cause the string ending character ('\0') to be > > read. > > > > > > Cc: Michael D Kinney > > > Cc: Liming Gao > > > Cc: Jiewen Yao > > > Cc: Star Zeng > > > Contributed-under: TianoCore Contribution Agreement 1.1 > > > Signed-off-by: Jian J Wang > > > --- > > > MdePkg/Library/BasePrintLib/PrintLibInternal.c | 5 > > ++++- > > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > > > diff --git > > a/MdePkg/Library/BasePrintLib/PrintLibInternal.c > > > b/MdePkg/Library/BasePrintLib/PrintLibInternal.c > > > index 28d946472f..297d5a05b5 100644 > > > --- a/MdePkg/Library/BasePrintLib/PrintLibInternal.c > > > +++ b/MdePkg/Library/BasePrintLib/PrintLibInternal.c > > > @@ -1107,7 +1107,10 @@ BasePrintLibSPrintMarker ( > > > // Compute the number of characters in > > ArgumentString and store it in > > > Count > > > // ArgumentString is either null-terminated, or > > it contains Precision > > > characters > > > // > > > - for (Count =3D 0; Count < Precision || ((Flags & > > PRECISION) =3D=3D 0); Count++) { > > > + for (Count =3D 0; > > > + ArgumentString[Count * > > BytesPerArgumentCharacter] !=3D '\0' && > > > + (Count < Precision || ((Flags & PRECISION) > > =3D=3D 0)); > > > + Count++) { > > > ArgumentCharacter =3D ((ArgumentString[Count * > > > BytesPerArgumentCharacter] & 0xff) | > > ((ArgumentString[Count * > > > BytesPerArgumentCharacter + 1]) << 8)) & ArgumentMask; > > > if (ArgumentCharacter =3D=3D 0) { > > > break; > > > -- > > > 2.15.1.windows.2 > > > > > > _______________________________________________ > > > edk2-devel mailing list > > > edk2-devel@lists.01.org > > > https://lists.01.org/mailman/listinfo/edk2-devel