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UefiCpuPkg/PiSmmCpuDxeSmm: Implement NULL pointer detection for SMM code

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The mechanism behind is the same as NULL pointer detection enabled in EDK-II
core. SMM has its own page table and we have to disable page 0 again in SMM
mode.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Ayellet Wolman <ayellet.wolman@intel.com>
Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
This commit is contained in:
Jian J Wang
2017-10-09 22:00:39 +08:00
committed by Eric Dong
parent a7181d952f
commit f8c1133bbb
4 changed files with 49 additions and 1 deletions
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12
UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/PageTbl.c
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@@ -155,6 +155,18 @@ SmiPFHandler (
}
}
//
// If NULL pointer was just accessed
//
if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT1) != 0 &&
(PFAddress < EFI_PAGE_SIZE)) {
DEBUG ((DEBUG_ERROR, "!!! NULL pointer access !!!\n"));
DEBUG_CODE (
DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);
);
CpuDeadLoop ();
}
if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
SmmProfilePFHandler (
SystemContext.SystemContextIa32->Eip,