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Improve truncated image checks to preven UEFIExtract crashes

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This commit is contained in:
Nikolaj Schlej 2022-10-15 09:20:55 +03:00
parent 0429225c56
commit 50396d7291
1 changed files with 28 additions and 16 deletions
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44
common/ffsparser.cpp
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@ -378,6 +378,13 @@ USTATUS FfsParser::parseIntelImage(const UByteArray & intelImage, const UINT32 l
if (regionSection->MeLimit) {
me.offset = calculateRegionOffset(regionSection->MeBase);
me.length = calculateRegionSize(regionSection->MeBase, regionSection->MeLimit);
if (intelImage.size() < me.offset + me.length) {
msg(usprintf("%s: ", __FUNCTION__)
+ itemSubtypeToUString(Types::Region, me.type)
+ UString(" region is located outside of the opened image. If your system uses dual-chip storage, please append another part to the opened image"),
index);
return U_TRUNCATED_IMAGE;
}
me.data = intelImage.mid(me.offset, me.length);
regions.push_back(me);
}
@ -398,13 +405,16 @@ USTATUS FfsParser::parseIntelImage(const UByteArray & intelImage, const UINT32 l
// Use ME region end as BIOS region offset
bios.offset = me.offset + me.length;
bios.length = (UINT32)intelImage.size() - bios.offset;
bios.data = intelImage.mid(bios.offset, bios.length);
}
// Normal descriptor map
else {
bios.data = intelImage.mid(bios.offset, bios.length);
}
if (intelImage.size() < bios.offset + bios.length) {
msg(usprintf("%s: ", __FUNCTION__)
+ itemSubtypeToUString(Types::Region, bios.type)
+ UString(" region is located outside of the opened image. If your system uses dual-chip storage, please append another part to the opened image"),
index);
return U_TRUNCATED_IMAGE;
}
bios.data = intelImage.mid(bios.offset, bios.length);
regions.push_back(bios);
}
else {
@ -425,6 +435,13 @@ USTATUS FfsParser::parseIntelImage(const UByteArray & intelImage, const UINT32 l
region.offset = calculateRegionOffset(*RegionBase);
region.length = calculateRegionSize(*RegionBase, *RegionLimit);
if (region.length != 0) {
if (intelImage.size() < region.offset + region.length) {
msg(usprintf("%s: ", __FUNCTION__)
+ itemSubtypeToUString(Types::Region, region.type)
+ UString(" region is located outside of the opened image. If your system uses dual-chip storage, please append another part to the opened image"),
index);
return U_TRUNCATED_IMAGE;
}
region.data = intelImage.mid(region.offset, region.length);
regions.push_back(region);
}
@ -444,7 +461,8 @@ USTATUS FfsParser::parseIntelImage(const UByteArray & intelImage, const UINT32 l
REGION_INFO region;
// Check intersection with the descriptor
if (regions.front().offset < FLASH_DESCRIPTOR_SIZE) {
msg(usprintf("%s: ", __FUNCTION__) + itemSubtypeToUString(Types::Region, regions.front().type)
msg(usprintf("%s: ", __FUNCTION__)
+ itemSubtypeToUString(Types::Region, regions.front().type)
+ UString(" region has intersection with flash descriptor"),
index);
return U_INVALID_FLASH_DESCRIPTOR;
@ -460,18 +478,12 @@ USTATUS FfsParser::parseIntelImage(const UByteArray & intelImage, const UINT32 l
// Check for intersections/paddings between regions
for (size_t i = 1; i < regions.size(); i++) {
UINT32 previousRegionEnd = regions[i-1].offset + regions[i-1].length;
// Check that current region is fully present in the image
if ((UINT64)regions[i].offset + (UINT64)regions[i].length > (UINT64)intelImage.size()) {
msg(usprintf("%s: ", __FUNCTION__) + itemSubtypeToUString(Types::Region, regions[i].type)
+ UString(" region is located outside of the opened image. If your system uses dual-chip storage, please append another part to the opened image"),
index);
return U_TRUNCATED_IMAGE;
}
// Check for intersection with previous region
if (regions[i].offset < previousRegionEnd) {
msg(usprintf("%s: ", __FUNCTION__) + itemSubtypeToUString(Types::Region, regions[i].type)
+ UString(" region has intersection with ") + itemSubtypeToUString(Types::Region, regions[i - 1].type) +UString(" region"),
msg(usprintf("%s: ", __FUNCTION__)
+ itemSubtypeToUString(Types::Region, regions[i].type)
+ UString(" region has intersection with ") + itemSubtypeToUString(Types::Region, regions[i - 1].type)
+ UString(" region"),
index);
return U_INVALID_FLASH_DESCRIPTOR;
}