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#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define STRINGLIT(S) #S
#define STRINGIFY(S) STRINGLIT(S)
// Required for oss-fuzz to consider the binary a target.
static const char* magic __attribute__((used)) = "LLVMFuzzerTestOneInput";
int main(int argc, char* argv[]) {
char path[PATH_MAX] = {0};
// Handle (currently not used) relative binary path.
if (**argv != '/') {
if (!getcwd(path, PATH_MAX - 1)) {
perror("getcwd");
exit(1);
}
strcat(path, "/");
}
if (strlen(path) + strlen(*argv) + 40 >= PATH_MAX) {
fprintf(stderr, "Path length would exceed PATH_MAX\n");
exit(1);
}
strcat(path, *argv);
char* solidus = strrchr(path, '/');
*solidus = 0; // terminate path before last /
char ld_path[PATH_MAX] = {0};
strcpy(ld_path, path);
strcat(ld_path, "/lib");
// Expects LD_LIBRARY_PATH to not also be set by oss-fuzz.
setenv("LD_LIBRARY_PATH", ld_path, 0);
setenv("HOME", "/tmp", 0);
setenv("MOZ_RUN_GTEST", "1", 1);
setenv("LIBFUZZER", "1", 1);
setenv("FUZZER", STRINGIFY(FUZZ_TARGET), 1);
// ContentParentIPC
char blacklist_path[PATH_MAX] = {0};
strcpy(blacklist_path, path);
strcat(blacklist_path, "/firefox/libfuzzer.content.blacklist.txt");
setenv("MOZ_IPC_MESSAGE_FUZZ_BLACKLIST", blacklist_path, 1);
// Temporary (or permanent?) work-arounds for fuzzing interface bugs.
char* options = getenv("ASAN_OPTIONS");
if (options) {
char* ptr;
char* new_options = strdup(options);
// https://bugzilla.mozilla.org/1477846
ptr = strstr(new_options, "detect_stack_use_after_return=1");
if (ptr) ptr[30] = '0';
// https://bugzilla.mozilla.org/1477844
ptr = strstr(new_options, "detect_leaks=1");
if (ptr) ptr[13] = '0';
setenv("ASAN_OPTIONS", new_options, 1);
free(new_options);
}
char ff_path[PATH_MAX] = {0};
strcpy(ff_path, path);
strcat(ff_path, "/firefox/firefox");
int ret = execv(ff_path, argv);
if (ret)
perror("execv");
return ret;
}
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