62 lines
2 KiB
Text
62 lines
2 KiB
Text
|
/*
|
||
|
|
|
||
|
|
This file is a simple way (on Linux) to do a certain kind
|
||
|
|
of test. "Code Testing Through Fault Injection" in ":login;"
|
||
|
|
magazine (December, 2014. Usenix.org) by Peter Gutmann offered
|
||
|
|
a simple example by an unnamed friend: instrument malloc() so
|
||
|
|
on call N it returns NULL. Try with N from 0 to some higher
|
||
|
|
number (I used 0 to 100). Run your chosen executable and
|
||
|
|
see how it fares. This test exposed a couple bugs in libdwarf.
|
||
|
|
|
||
|
|
Here are some of the example core dumps (running dwarfgen):
|
||
|
|
2000: Could not allocate Dwarf_Error structure, abort() in libdwarf.
|
||
|
|
1000: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
500: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
250: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
125: Could not allocate Dwarf_Error structure, abort() in libdwarf.
|
||
|
|
Aborted (core dumped)
|
||
|
|
100: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
46-60: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
45- Could not allocate Dwarf_Error structure, abort() in libdwarf.
|
||
|
|
Aborted (core dumped)
|
||
|
|
42-44: FAIL:bad alloc caughtstd::bad_alloc
|
||
|
|
30- 41: Could not allocate Dwarf_Error structure, abort() in libdwarf.
|
||
|
|
Aborted (core dumped)
|
||
|
|
28-29 :FAIL:bad alloc caught std::bad_alloc
|
||
|
|
Aborted (core dumped)
|
||
|
|
|
||
|
|
8,9,10,11-27: Could not allocate Dwarf_Error structure, abort() in libdwarf.
|
||
|
|
Aborted (core dumped)
|
||
|
|
7: 6: FAIL:bad alloc caught std::bad_alloc
|
||
|
|
|
||
|
|
0,1,2,3,4,5: terminate called after throwing an instance of 'std::bad_alloc'
|
||
|
|
what(): std::bad_alloc
|
||
|
|
Aborted (core dumped)
|
||
|
|
|
||
|
|
-------HOW TO USE:
|
||
|
|
Configure generates the following for Makefile.
|
||
|
|
$(CXX) $(CXXFLAGS) -o $@ $(DGOBJECTS) $(LDFLAGS)
|
||
|
|
|
||
|
|
In the generated Makefile, replace the above line with
|
||
|
|
these two lines.
|
||
|
|
$(CC) $(CFLAGS) -c fakemalloc.o
|
||
|
|
$(CXX) $(CXXFLAGS) -o $@ $(DGOBJECTS) $(LDFLAGS) fakemalloc.o
|
||
|
|
|
||
|
|
Run tests using the script TESTmallocfail
|
||
|
|
-------
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
static unsigned count;
|
||
|
|
extern void * __libc_malloc();
|
||
|
|
|
||
|
|
void *malloc(unsigned len)
|
||
|
|
{
|
||
|
|
/* Perhaps the test should be count >= FAILCOUNT ??? */
|
||
|
|
if (count == FAILCOUNT) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
count++;
|
||
|
|
return __libc_malloc(len);
|
||
|
|
}
|