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UefiCpuPkg/CpuExceptionHandlerLib: fix incorrect init of exception stack 

This issue is introduced at following commit, which tried to add stack
switch support on behalf of Stack Guard feature.

    0ff5aa9cae

The field KnownGoodStackTop in CPU_EXCEPTION_INIT_DATA is initialized to
the start address of array mNewStack. This is wrong. It must be the end
of mNewStack. This patch fixes this mistake.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Jian J Wang 2018-02-27 09:04:23 +08:00 committed by Ruiyu Ni
parent de707b0866
commit d429d00f97
1 changed files with 1 additions and 1 deletions
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2
UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c
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@ -270,7 +270,7 @@ InitializeCpuExceptionHandlersEx (
AsmReadGdtr (&Gdtr);
EssData.X64.Revision = CPU_EXCEPTION_INIT_DATA_REV;
EssData.X64.KnownGoodStackTop = (UINTN)mNewStack;
EssData.X64.KnownGoodStackTop = (UINTN)mNewStack + sizeof (mNewStack);
EssData.X64.KnownGoodStackSize = CPU_KNOWN_GOOD_STACK_SIZE;
EssData.X64.StackSwitchExceptions = CPU_STACK_SWITCH_EXCEPTION_LIST;
EssData.X64.StackSwitchExceptionNumber = CPU_STACK_SWITCH_EXCEPTION_NUMBER;