[edk2-devel] [PATCH] IntelFrameworkModulePkg/DebugLib: Fix string copy issue

[Liming Gao]

Reviewed-by: Liming Gao <liming.gao at intel.com>

> -----Original Message-----
> From: Wu, Hao A
> Sent: Tuesday, May 21, 2019 4:03 PM
> To: devel at edk2.groups.io; Gao, Zhichao <zhichao.gao at intel.com>
> Cc: Gao, Liming <liming.gao at intel.com>
> Subject: RE: [edk2-devel] [PATCH] IntelFrameworkModulePkg/DebugLib: Fix string copy issue
> 
> > -----Original Message-----
> > From: devel at edk2.groups.io [mailto:devel at edk2.groups.io] On Behalf Of
> > Gao, Zhichao
> > Sent: Tuesday, May 21, 2019 3:50 PM
> > To: devel at edk2.groups.io
> > Cc: Gao, Liming; Wu, Hao A
> > Subject: [edk2-devel] [PATCH] IntelFrameworkModulePkg/DebugLib: Fix
> > string copy issue
> >
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1826
> >
> > There is a bug to use AsciiStrCpyS to copy a truncated
> > string. If would cause an assert because the truncated
> > length is always less than the source string length. It
> > should use the AsciiStrnCpyS instead.
> >
> > Cc: Liming Gao <liming.gao at intel.com>
> > Cc: Hao A Wu <hao.a.wu at intel.com>
> > Signed-off-by: Zhichao Gao <zhichao.gao at intel.com>
> > ---
> >  .../Library/PeiDxeDebugLibReportStatusCode/DebugLib.c         | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git
> > a/IntelFrameworkModulePkg/Library/PeiDxeDebugLibReportStatusCode/De
> > bugLib.c
> > b/IntelFrameworkModulePkg/Library/PeiDxeDebugLibReportStatusCode/De
> > bugLib.c
> > index e92601f89e..1840b6d683 100644
> > ---
> > a/IntelFrameworkModulePkg/Library/PeiDxeDebugLibReportStatusCode/De
> > bugLib.c
> > +++
> > b/IntelFrameworkModulePkg/Library/PeiDxeDebugLibReportStatusCode/De
> > bugLib.c
> > @@ -150,7 +150,7 @@ DebugPrintMarker (
> >    FormatString          = (CHAR8 *)((UINT64 *)(DebugInfo + 1) + 12);
> >
> >    //
> > -  // Copy the Format string into the record
> > +  // Copy the Format string into the record. It will be truncated if it's too long.
> >    //
> >    // According to the content structure of Buffer shown above, the size of
> >    // the FormatString buffer is the size of Buffer minus the Padding
> > @@ -158,7 +158,7 @@ DebugPrintMarker (
> >    // variable arguments (12 * sizeof (UINT64)).
> >    //
> >    DestBufferSize = sizeof (Buffer) - 4 - sizeof (EFI_DEBUG_INFO) - 12 * sizeof
> > (UINT64);
> > -  AsciiStrCpyS (FormatString, DestBufferSize / sizeof (CHAR8), Format);
> > +  AsciiStrnCpyS (FormatString, DestBufferSize / sizeof (CHAR8), Format,
> > DestBufferSize / sizeof (CHAR8) - 1);
> 
> Reviewed-by: Hao A Wu <hao.a.wu at intel.com>
> 
> Best Regards,
> Hao Wu
> 
> >
> >    //
> >    // The first 12 * sizeof (UINT64) bytes following EFI_DEBUG_INFO are for
> > variable arguments
> > --
> > 2.21.0.windows.1
> >
> >
> > 


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