https://llvm.org/bugs/show_bug.cgi?id=25767
Bug ID: 25767
Summary: Seed values for LibFuzzer are read in as signed
integers
Product: new-bugs
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: danielaus...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
In FuzzerDriver.cpp, this happened:
#define FUZZER_FLAG_INT(Name, Default, Description) int Name;
This results in 'stol: out of range' exceptions when processing a value larger
than 2147483647. This was identified by running:
./fuzzer -seed=2574387484
on a 32-bit ARM device (Current AOSP, Nexus 6)
Fuzzing session replay requires first checking if the generated seed value is
greater than 2147483647, and translating it to its hex representation, which
does not trigger the out of range issue.
This only seems to be an issue when using the seed flag, the seed value in
FuzzerDriver is an unsigned and appears to be handled correctly in the rest of
the library.
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