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ShellPkg/dmem: Only dump sizeof (EFI_SYSTEM_TABLE) bytes for gST 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1236

When "dmem" runs without additional arguments, it dumps the memory
content of EFI_SYSTEM_TABLE. But today's implementation dumps 512
bytes. It's not correct because sizeof (EFI_SYSTEM_TABLE) is less
than 512, the 512-read causes page fault exception in a heap-guard
enabled environment.

The patch changes the implementation to only dump
sizeof (EFI_SYSTEM_TABLE) bytes for gST.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Jim Dailey <jim_dailey@.com>
This commit is contained in:
Ruiyu Ni 2018-10-11 15:51:45 +08:00
parent a58a421c36
commit f1a7d73a68
1 changed files with 1 additions and 1 deletions
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2
ShellPkg/Library/UefiShellDebug1CommandsLib/Dmem.c
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@ -149,7 +149,7 @@ ShellCommandRunDmem (
Temp1 = ShellCommandLineGetRawValue(Package, 1);
if (Temp1 == NULL) {
Address = gST;
Size = 512;
Size = sizeof (*gST);
} else {
if (!ShellIsHexOrDecimalNumber(Temp1, TRUE, FALSE) || EFI_ERROR(ShellConvertStringToUint64(Temp1, (UINT64*)&Address, TRUE, FALSE))) {
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PARAM_INV), gShellDebug1HiiHandle, L"dmem", Temp1);