https://llvm.org/bugs/show_bug.cgi?id=31031
Bug ID: 31031
Summary: __cxa_demangle consumes 6.5Gb on
"___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1
D1D1D1D1D1D1D"
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: k...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Feed "___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D"
into __cxa_demangle and watch it consume 6.5 Gb of RAM:
#include <stddef.h>
extern "C" char *
__cxa_demangle(const char *mangled_name, char *buf, size_t *n, int *status);
int main() {
__cxa_demangle("___Z2i_D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D1D",
0, 0, 0);
}
clang++ -std=c++11 -g cxa_demangle.cpp -I../include repro.cc -o repro
/usr/bin/time ./repro
8.55user 2.41system 0:10.98elapsed 99%CPU (0avgtext+0avgdata
6557996maxresident)k
(found by libFuzzer, see also
https://bugs.chromium.org/p/chromium/issues/detail?id=606626)
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