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eb18816b59
Summary:
Retagging allocas before returning from the function might help
detecting use after return bugs, but it does not work at all in real
life, when instrumented and non-instrumented code is intermixed.
Consider the following code:
F_non_instrumented() {
T x;
F1_instrumented(&x);
...
}
{
F_instrumented();
F_non_instrumented();
}
- F_instrumented call leaves the stack below the current sp tagged
randomly for UAR detection
- F_non_instrumented allocates its own vars on that tagged stack,
not generating any tags, that is the address of x has tag 0, but the
shadow memory still contains tags left behind by F_instrumented on the
previous step
- F1_instrumented verifies &x before using it and traps on tag mismatch,
0 vs whatever tag was set by F_instrumented
Reviewers: eugenis
Subscribers: srhines, llvm-commits
Differential Revision: https://reviews.llvm.org/D48664
llvm-svn: 336011
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|---|---|---|
| .. | ||
| AddressSanitizer | ||
| BoundsChecking | ||
| DataFlowSanitizer | ||
| EfficiencySanitizer | ||
| HWAddressSanitizer | ||
| InstrProfiling | ||
| MemorySanitizer | ||
| SanitizerCoverage | ||
| ThreadSanitizer | ||