-
Notifications
You must be signed in to change notification settings - Fork 11.6k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
[hwasan] Allow stack traces even when fixed shadow is used #109344
base: main
Are you sure you want to change the base?
Conversation
Previously, fixed shadow implied !InTls, and !InTls implied no stack traces, but InTls implied it would not use a fixed shadow. This patch changes fixed shadow to be compatible with stack traces. It maintains the legacy behavior for KHWAsan || InstrumentWithCalls.
@llvm/pr-subscribers-llvm-transforms @llvm/pr-subscribers-compiler-rt-sanitizer Author: Thurston Dang (thurstond) ChangesPreviously, fixed shadow implied !InTls, and !InTls implied no stack traces, but InTls implied it would not use a fixed shadow. This patch changes fixed shadow to be compatible with stack traces. It maintains the legacy behavior for KHWAsan || InstrumentWithCalls. Full diff: https://github.com/llvm/llvm-project/pull/109344.diff 1 Files Affected:
diff --git a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
index 7a5c690c7ea512..4bdf5b97aeb704 100644
--- a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
@@ -1340,7 +1340,7 @@ Value *HWAddressSanitizer::getFrameRecordInfo(IRBuilder<> &IRB) {
}
void HWAddressSanitizer::emitPrologue(IRBuilder<> &IRB, bool WithFrameRecord) {
- if (!Mapping.InTls)
+ if (!Mapping.InTls || (Mapping.Offset != 0 && Mapping.Offset != kDynamicShadowSentinel))
ShadowBase = getShadowNonTls(IRB);
else if (!WithFrameRecord && TargetTriple.isAndroid())
ShadowBase = getDynamicShadowIfunc(IRB);
@@ -1897,16 +1897,19 @@ void HWAddressSanitizer::ShadowMapping::init(Triple &TargetTriple,
InTls = false;
Offset = 0;
WithFrameRecord = true;
- } else if (ClMappingOffset.getNumOccurrences() > 0) {
- InGlobal = false;
- InTls = false;
- Offset = ClMappingOffset;
- WithFrameRecord = false;
} else if (ClEnableKhwasan || InstrumentWithCalls) {
InGlobal = false;
InTls = false;
- Offset = 0;
+ if (ClMappingOffset.getNumOccurrences() > 0)
+ Offset = ClMappingOffset;
+ else
+ Offset = 0;
WithFrameRecord = false;
+ } else if (ClMappingOffset.getNumOccurrences() > 0) {
+ InGlobal = false;
+ InTls = true;
+ Offset = ClMappingOffset;
+ WithFrameRecord = true;
} else if (ClWithIfunc) {
InGlobal = true;
InTls = false;
|
You can test this locally with the following command:git-clang-format --diff 1335a11176f99cc54f423fe173708bd2373b59f7 ad9acd0085a9166bda420ed6aeba6dcadac899fb --extensions cpp -- llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp View the diff from clang-format here.diff --git a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
index 4c4ad7ee9e..479961a72f 100644
--- a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
@@ -1925,4 +1925,3 @@ void HWAddressSanitizer::ShadowMapping::init(Triple &TargetTriple,
WithFrameRecord = false;
}
}
-
|
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
advance copy of nit, will think about the PR tomorrow
} else if (ClEnableKhwasan || InstrumentWithCalls) { | ||
InGlobal = false; | ||
InTls = false; | ||
Offset = 0; | ||
if (ClMappingOffset.getNumOccurrences() > 0) |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
optOr
.
Previously, fixed shadow implied !InTls, and !InTls implied no stack traces, but InTls implied it would not use a fixed shadow. This patch changes fixed shadow to be compatible with stack traces.
It maintains the legacy behavior for KHWAsan || InstrumentWithCalls.