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Remove AFL_PRELOAD and AFL_USE_QASAN handlers

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These are now processed in afl-qemu-trace so that the "copy+paste" code
that is in all of the other AFL tools can be removed.

This also allows the AFL_USE_QASAN flag to work the same when used
with tools like afl-fuzz as it does with afl-qemu-trace. This is
important in situations where loading the QASAN library changes
the address of your desired entrypoint, or for crash validation
using the same environment that afl-fuzz was using.

With this change, the same set of environment variables can be used
in exactly the same way between afl-fuzz, afl-showmap, and
afl-qemu-trace, and you will get exactly the same guest environment.
This commit is contained in:
realmadsci
2021-03-15 11:45:58 -04:00
parent 01ad0f3c6a
commit 01ad7610be
7 changed files with 5 additions and 322 deletions
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60
src/afl-common.c
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@ -338,66 +338,6 @@ char **get_wine_argv(u8 *own_loc, u8 **target_path_p, int argc, char **argv) {
}
/* Get libqasan path. */
u8 *get_libqasan_path(u8 *own_loc) {
if (!unlikely(own_loc)) { FATAL("BUG: param own_loc is NULL"); }
u8 *tmp, *cp = NULL, *rsl, *own_copy;
tmp = getenv("AFL_PATH");
if (tmp) {
cp = alloc_printf("%s/libqasan.so", tmp);
if (access(cp, X_OK)) { FATAL("Unable to find '%s'", tmp); }
return cp;
}
own_copy = ck_strdup(own_loc);
rsl = strrchr(own_copy, '/');
if (rsl) {
*rsl = 0;
cp = alloc_printf("%s/libqasan.so", own_copy);
ck_free(own_copy);
if (!access(cp, X_OK)) { return cp; }
} else {
ck_free(own_copy);
}
if (!access(AFL_PATH "/libqasan.so", X_OK)) {
if (cp) { ck_free(cp); }
return ck_strdup(AFL_PATH "/libqasan.so");
}
SAYF("\n" cLRD "[-] " cRST
"Oops, unable to find the 'libqasan.so' binary. The binary must be "
"built\n"
" separately by following the instructions in "
"qemu_mode/libqasan/README.md. "
"If you\n"
" already have the binary installed, you may need to specify "
"AFL_PATH in the\n"
" environment.\n");
FATAL("Failed to locate 'libqasan.so'.");
}
/* Find binary, used by analyze, showmap, tmin
@returns the path, allocating the string */