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minor cmplog fix

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This commit is contained in:
vanhauser-thc 2021-02-16 09:54:15 +01:00
parent 686719cdca
commit 80bdbf7be0
2 changed files with 21 additions and 2 deletions
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1
docs/Changelog.md
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@ -48,6 +48,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
support (less performant than our own), GCC for old afl-gcc and
CLANG for old afl-clang
- fixed a potential crash in the LAF feature
- workaround for llvm bitcast lto bug
- workaround for llvm 13
- qemuafl
- QASan (address sanitizer for Qemu) ported to qemuafl!

22
instrumentation/cmplog-instructions-pass.cc
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@ -266,13 +266,20 @@ bool CmpLogInstructions::hookInstrs(Module &M) {
unsigned int max_size = Val->getType()->getIntegerBitWidth(), cast_size;
unsigned char do_cast = 0;
if (!SI->getNumCases() || max_size < 16 || max_size % 8) {
if (!SI->getNumCases() || max_size < 16) {
// if (!be_quiet) errs() << "skip trivial switch..\n";
continue;
}
if (max_size % 8) {
max_size = (((max_size / 8) + 1) * 8);
do_cast = 1;
}
IRBuilder<> IRB(SI->getParent());
IRB.SetInsertPoint(SI);
@ -310,8 +317,10 @@ bool CmpLogInstructions::hookInstrs(Module &M) {
Value *CompareTo = Val;
if (do_cast) {
CompareTo =
IRB.CreateIntCast(CompareTo, IntegerType::get(C, cast_size), false);
}
for (SwitchInst::CaseIt i = SI->case_begin(), e = SI->case_end(); i != e;
@ -331,8 +340,10 @@ bool CmpLogInstructions::hookInstrs(Module &M) {
Value *new_param = cint;
if (do_cast) {
new_param =
IRB.CreateIntCast(cint, IntegerType::get(C, cast_size), false);
}
if (new_param) {
@ -490,7 +501,14 @@ bool CmpLogInstructions::hookInstrs(Module &M) {
}
if (!max_size || max_size % 8 || max_size < 16) { continue; }
if (!max_size || max_size < 16) { continue; }
if (max_size % 8) {
max_size = (((max_size / 8) + 1) * 8);
do_cast = 1;
}
if (max_size > 128) {