回复: 回复: [edk2-devel] [PATCH v1 3/3] CryptoPkg/BaseCryptLib: Fix possible uninitialized use

["gaoliming" <gaoliming@byosoft.com.cn>]

Sergei:
  Thanks for your confirmation. I will send the patch to update GCC5 tool chain with this option. 

Thanks
Liming
> -----邮件原件-----
> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Sergei
> Dmitrouk
> 发送时间: 2021年5月19日 0:03
> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> 抄送: jiewen.yao@intel.com; 'Wang, Jian J' <jian.j.wang@intel.com>; 'Lu,
> XiaoyuX' <xiaoyux.lu@intel.com>; 'Jiang, Guomin' <guomin.jiang@intel.com>
> 主题: Re: 回复: [edk2-devel] [PATCH v1 3/3] CryptoPkg/BaseCryptLib: Fix
> possible uninitialized use
> 
> Yes, adding `-ffat-lto-objects` makes the warning appear even with GCC 5.5.0.
> 
> Regards,
> Sergei
> 
> On Tue, May 18, 2021 at 08:59:05AM +0800, gaoliming wrote:
> > Sergei:
> >   Yes. GCC49 is LTO disable GCC tool chain. GCC5 is LTO enable tool chain.
> > They both work on the different GCC version, such as gcc5, gcc6..
> >
> >   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844 mentions
> > -ffat-lto-objects option that can trig the warning with LTO option. Do you
> > try it?
> >
> >   If this option works, we can update GCC5 tool chain definition in
> > tools_def.txt, then this issue can be detected in CI GCC5 build.
> >
> > Thanks
> > Liming
> > > -----邮件原件-----
> > > 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Sergei
> > > Dmitrouk
> > > 发送时间: 2021年5月15日 21:01
> > > 收件人: devel@edk2.groups.io; jiewen.yao@intel.com
> > > 抄送: Wang, Jian J <jian.j.wang@intel.com>; Lu, XiaoyuX
> > > <xiaoyux.lu@intel.com>; Jiang, Guomin <guomin.jiang@intel.com>
> > > 主题: Re: [edk2-devel] [PATCH v1 3/3] CryptoPkg/BaseCryptLib: Fix
> possible
> > > uninitialized use
> > >
> > > Hello Jiewen,
> > >
> > > I get the error only for GCC49 and not for GCC5 toolchain.  CI uses GCC5.
> > >
> > > So I compared build commands and this seems to depend on LTO.  Adding
> > > `-flto`
> > > impedes compiler's ability to detect such simple issues.
> > >
> > > I've found relevant bug report, there is even fix suggestion from last
> > month:
> > >
> > >     https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844
> > >
> > > Regards,
> > > Sergei
> > >
> > > On Sat, May 15, 2021 at 12:30:44AM +0000, Yao, Jiewen wrote:
> > > > Hi Sergei
> > > > Thank you very much for the fix.
> > > > Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
> > > >
> > > > I am a little surprised why it is not caught before. It is an obvious
> > logic issue.
> > > >
> > > > Do you think we can do anything on CI, to catch it during pre-check-in
> > in the
> > > future?
> > > > I just feel it is burden to make it post-check-in fix.
> > > >
> > > >
> > > > Thank you
> > > > Yao Jiewen
> > > >
> > > > > -----Original Message-----
> > > > > From: Sergei Dmitrouk <sergei@posteo.net>
> > > > > Sent: Friday, May 14, 2021 8:17 PM
> > > > > To: devel@edk2.groups.io
> > > > > Cc: Yao, Jiewen <jiewen.yao@intel.com>; Wang, Jian J
> > > <jian.j.wang@intel.com>;
> > > > > Lu, XiaoyuX <xiaoyux.lu@intel.com>; Jiang, Guomin
> > > <guomin.jiang@intel.com>
> > > > > Subject: [PATCH v1 3/3] CryptoPkg/BaseCryptLib: Fix possible
> > uninitialized
> > > use
> > > > >
> > > > > `Result` can be used uninitialized in both functions after following
> > > > > either first or second `goto` statement.
> > > > >
> > > > > Cc: Jiewen Yao <jiewen.yao@intel.com>
> > > > > Cc: Jian J Wang <jian.j.wang@intel.com>
> > > > > Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
> > > > > Cc: Guomin Jiang <guomin.jiang@intel.com>
> > > > > Signed-off-by: Sergei Dmitrouk <sergei@posteo.net>
> > > > > ---
> > > > >  CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPss.c     | 1 +
> > > > >  CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPssSign.c | 1 +
> > > > >  2 files changed, 2 insertions(+)
> > > > >
> > > > > diff --git a/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPss.c
> > > > > b/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPss.c
> > > > > index 4009d37d5f91..0b2960f06c4c 100644
> > > > > --- a/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPss.c
> > > > > +++ b/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPss.c
> > > > > @@ -82,6 +82,7 @@ RsaPssVerify (
> > > > >    EVP_PKEY_CTX *KeyCtx;
> > > > >    CONST EVP_MD  *HashAlg;
> > > > >
> > > > > +  Result = FALSE;
> > > > >    EvpRsaKey = NULL;
> > > > >    EvpVerifyCtx = NULL;
> > > > >    KeyCtx = NULL;
> > > > > diff --git a/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPssSign.c
> > > > > b/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPssSign.c
> > > > > index b66b6f7296ad..ece765f9ae0a 100644
> > > > > --- a/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPssSign.c
> > > > > +++ b/CryptoPkg/Library/BaseCryptLib/Pk/CryptRsaPssSign.c
> > > > > @@ -97,6 +97,7 @@ RsaPssSign (
> > > > >    EVP_PKEY_CTX          *KeyCtx;
> > > > >    CONST EVP_MD          *HashAlg;
> > > > >
> > > > > +  Result = FALSE;
> > > > >    EvpRsaKey = NULL;
> > > > >    EvpVerifyCtx = NULL;
> > > > >    KeyCtx = NULL;
> > > > > --
> > > > > 2.17.6
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