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ARM MTE stack sanitizer.

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Add "memtag" sanitizer that detects and mitigates stack memory issues
using armv8.5 Memory Tagging Extension.

It is similar in principle to HWASan, which is a software implementation
of the same idea, but there are enough differencies to warrant a new
sanitizer type IMHO. It is also expected to have very different
performance properties.

The new sanitizer does not have a runtime library (it may grow one
later, along with a "debugging" mode). Similar to SafeStack and
StackProtector, the instrumentation pass (in a follow up change) will be
inserted in all cases, but will only affect functions marked with the
new sanitize_memtag attribute.

Reviewers: pcc, hctim, vitalybuka, ostannard

Subscribers: srhines, mehdi_amini, javed.absar, kristof.beyls, hiraditya, cryptoad, steven_wu, dexonsmith, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D64169

llvm-svn: 366123
This commit is contained in:
Evgeniy Stepanov
2019-07-15 20:02:23 +00:00
parent c5d7b0c454
commit c5e7f56249
28 changed files with 149 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1296,6 +1296,9 @@ static uint64_t getRawAttributeMask(Attribute::AttrKind Val) {
case Attribute::AllocSize:
llvm_unreachable("allocsize not supported in raw format");
break;
case Attribute::SanitizeMemTag:
llvm_unreachable("sanitize_memtag attribute not supported in raw format");
break;
}
llvm_unreachable("Unsupported attribute type");
}
@@ -1305,7 +1308,8 @@ static void addRawAttributeValue(AttrBuilder &B, uint64_t Val) {
for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
I = Attribute::AttrKind(I + 1)) {
if (I == Attribute::Dereferenceable ||
if (I == Attribute::SanitizeMemTag ||
I == Attribute::Dereferenceable ||
I == Attribute::DereferenceableOrNull ||
I == Attribute::ArgMemOnly ||
I == Attribute::AllocSize ||
@@ -1534,6 +1538,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
return Attribute::ZExt;
case bitc::ATTR_KIND_IMMARG:
return Attribute::ImmArg;
case bitc::ATTR_KIND_SANITIZE_MEMTAG:
return Attribute::SanitizeMemTag;
}
}