xt-sys/exectos
xt-sys/exectos
3
5
Fork 3
Code Issues 3 Pull Requests 1 Actions Projects 1 Releases Wiki Activity

Fix pointer offset in PE relocation code
All checks were successful
ci/woodpecker/push/build Pipeline was successful
Details

Browse Source
This commit is contained in:
Rafal Kupiec 2023-01-29 20:38:05 +01:00
parent ddffd0c582
commit 2bf15a5bb8
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
xtldr/modules/pecoff/pecoff.c
View File

@ -450,9 +450,9 @@ PepRelocateLoadedImage(IN PPECOFF_IMAGE_CONTEXT Image)
while(RelocationDir < RelocationEnd && RelocationDir->SizeOfBlock > 0)
{
/* Calculate number of relocations needed, address and type offset */
Count = (RelocationDir->SizeOfBlock - sizeof(PECOFF_IMAGE_BASE_RELOCATION)) / sizeof(UINT16);
Address = (UINT32*)((UINT8*)Image->Data + RelocationDir->VirtualAddress);
TypeOffset = (UINT16*)((UINT8*)RelocationDir + sizeof(PECOFF_IMAGE_BASE_RELOCATION));
Count = (RelocationDir->SizeOfBlock - sizeof(PECOFF_IMAGE_BASE_RELOCATION)) / sizeof(USHORT);
Address = (PUINT)((PUCHAR)Image->Data + RelocationDir->VirtualAddress);
TypeOffset = (PUSHORT)((PUCHAR)RelocationDir + sizeof(PECOFF_IMAGE_BASE_RELOCATION));
/* Do relocations */
while(Count--)
@ -480,12 +480,12 @@ PepRelocateLoadedImage(IN PPECOFF_IMAGE_CONTEXT Image)
break;
case PECOFF_IMAGE_REL_BASED_DIR64:
/* 64-bit relocation */
LongPtr = (UINT64*)((UINT8*)Address + Offset);
LongPtr = (PULONGLONG)((PUCHAR)Address + Offset);
*LongPtr = *LongPtr - ImageBase + (UINT_PTR)Image->VirtualAddress;
break;
case PECOFF_IMAGE_REL_BASED_HIGHLOW:
/* 32-bit relocation of hight and low half of address */
ShortPtr = (UINT32*)((UINT8*)Address + Offset);
ShortPtr = (PUINT32)((PUCHAR)Address + Offset);
*ShortPtr = *ShortPtr - ImageBase + (UINT_PTR)Image->VirtualAddress;
break;
default:
@ -496,8 +496,9 @@ PepRelocateLoadedImage(IN PPECOFF_IMAGE_CONTEXT Image)
/* Increment the type offset */
TypeOffset++;
}
/* Next relocation */
RelocationDir += RelocationDir->SizeOfBlock;
RelocationDir = (PPECOFF_IMAGE_BASE_RELOCATION)((PUCHAR)RelocationDir + RelocationDir->SizeOfBlock);
}
/* Return SUCCESS */