[edk2-devel] [PATCH 1/1] MdeModulePkg/EbcDxe: Mitigate memcpy intrinsics

[Wu, Hao A]

Pushed via:
PR - https://github.com/tianocore/edk2/pull/1928
Commit - https://github.com/tianocore/edk2/commit/b04453d36bd87735aadd29adbefce8d147f18a35

Best Regards,
Hao Wu

> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Wu, Hao
> A
> Sent: Friday, August 20, 2021 1:15 PM
> To: devel at edk2.groups.io; mhaeuser at posteo.de
> Cc: Wang, Jian J <jian.j.wang at intel.com>; Vitaly Cheptsov
> <vit9696 at protonmail.com>
> Subject: Re: [edk2-devel] [PATCH 1/1] MdeModulePkg/EbcDxe: Mitigate
> memcpy intrinsics
> 
> > -----Original Message-----
> > From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of
> Marvin
> > H?user
> > Sent: Monday, August 16, 2021 4:12 AM
> > To: devel at edk2.groups.io
> > Cc: Wang, Jian J <jian.j.wang at intel.com>; Wu, Hao A
> > <hao.a.wu at intel.com>; Vitaly Cheptsov <vit9696 at protonmail.com>
> > Subject: [edk2-devel] [PATCH 1/1] MdeModulePkg/EbcDxe: Mitigate
> memcpy
> > intrinsics
> >
> > Assignments of structure values cause the emission of memcpy()
> > intrinsics by the CLANG38 toolchain. Substitute the assignments with
> > calls to CopyMem() to mitigate the issue.
> 
> 
> Reviewed-by: Hao A Wu <hao.a.wu at intel.com> Will merge after the
> upcoming stable tag.
> 
> Best Regards,
> Hao Wu
> 
> 
> >
> > Cc: Jian J Wang <jian.j.wang at intel.com>
> > Cc: Hao A Wu <hao.a.wu at intel.com>
> > Cc: Vitaly Cheptsov <vit9696 at protonmail.com>
> > Signed-off-by: Marvin Häuser <mhaeuser at posteo.de>
> > ---
> >  MdeModulePkg/Universal/EbcDxe/EbcDebugger/Edb.c              | 6 +++++-
> >  MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdBreakpoint.c | 6
> > +++++-
> >  MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbHook.c          | 6
> +++++-
> >  3 files changed, 15 insertions(+), 3 deletions(-)
> >
> > diff --git a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/Edb.c
> > b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/Edb.c
> > index 611b2de5d81f..e417f4870f3d 100644
> > --- a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/Edb.c
> > +++ b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/Edb.c
> > @@ -219,7 +219,11 @@ EdbCheckBreakpoint (
> >        //
> >
> >        // If hit, record current breakpoint
> >
> >        //
> >
> > -      DebuggerPrivate-
> > >DebuggerBreakpointContext[EFI_DEBUGGER_BREAKPOINT_MAX] =
> > DebuggerPrivate->DebuggerBreakpointContext[Index];
> >
> > +      CopyMem (
> >
> > +        &DebuggerPrivate-
> > >DebuggerBreakpointContext[EFI_DEBUGGER_BREAKPOINT_MAX],
> >
> > +        &DebuggerPrivate->DebuggerBreakpointContext[Index],
> >
> > +        sizeof (DebuggerPrivate-
> > >DebuggerBreakpointContext[EFI_DEBUGGER_BREAKPOINT_MAX])
> >
> > +        );
> >
> >        DebuggerPrivate-
> > >DebuggerBreakpointContext[EFI_DEBUGGER_BREAKPOINT_MAX].State
> =
> > TRUE;
> >
> >        //
> >
> >        // Do not set Breakpoint flag. We record the address here just
> > let it not patch breakpoint address when de-init.
> >
> > diff --git
> > a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdBreakpoint.c
> > b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdBreakpoint.c
> > index e0c797be247f..5d32c684066e 100644
> > ---
> a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdBreakpoint.c
> > +++
> > b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdBreakpoint.c
> > @@ -158,7 +158,11 @@ DebuggerBreakpointDel (
> >    // Delete this breakpoint
> >
> >    //
> >
> >    for (BpIndex = Index; BpIndex < DebuggerPrivate-
> > >DebuggerBreakpointCount - 1; BpIndex++) {
> >
> > -    DebuggerPrivate->DebuggerBreakpointContext[BpIndex] =
> > DebuggerPrivate->DebuggerBreakpointContext[BpIndex + 1];
> >
> > +    CopyMem (
> >
> > +      &DebuggerPrivate->DebuggerBreakpointContext[BpIndex],
> >
> > +      &DebuggerPrivate->DebuggerBreakpointContext[BpIndex + 1],
> >
> > +      sizeof (DebuggerPrivate->DebuggerBreakpointContext[BpIndex])
> >
> > +      );
> >
> >    }
> >
> >    ZeroMem (
> >
> >      &DebuggerPrivate->DebuggerBreakpointContext[BpIndex],
> >
> > diff --git a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbHook.c
> > b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbHook.c
> > index 83257a2c25fe..1bfe5240c760 100644
> > --- a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbHook.c
> > +++ b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbHook.c
> > @@ -230,7 +230,11 @@ EbcDebuggerPushTraceDestEntry (
> >      //
> >
> >      ASSERT
> > (mDebuggerPrivate.TraceEntry[EFI_DEBUGGER_TRACE_MAX].Type ==
> Type);
> >
> >      for (Index = 0; Index < EFI_DEBUGGER_TRACE_MAX; Index++) {
> >
> > -      mDebuggerPrivate.TraceEntry[Index] =
> > mDebuggerPrivate.TraceEntry[Index + 1];
> >
> > +      CopyMem (
> >
> > +        &mDebuggerPrivate.TraceEntry[Index],
> >
> > +        &mDebuggerPrivate.TraceEntry[Index + 1],
> >
> > +        sizeof (mDebuggerPrivate.TraceEntry[Index])
> >
> > +        );
> >
> >      }
> >
> >      mDebuggerPrivate.TraceEntry[EFI_DEBUGGER_CALLSTACK_MAX -
> > 1].DestAddress = DestEntry;
> >
> >      mDebuggerPrivate.TraceEntryCount = EFI_DEBUGGER_TRACE_MAX;
> >
> > --
> > 2.31.1
> >
> >
> >
> >
> >
> 
> 
> 
> 
> 



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