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check for empty AFL env vars

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This commit is contained in:
van Hauser
2020-04-09 13:17:56 +02:00
committed by Dominik Maier
parent b8d84ababb
commit 66f535ad61
1 changed files with 14 additions and 3 deletions
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17
src/afl-common.c
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@ -353,7 +353,7 @@ void check_environment_vars(char **envp) {
if (be_quiet) return; if (be_quiet) return;
int index = 0, found = 0; int index = 0, found = 0;
char *env; char *env, *val;
while ((env = envp[index++]) != NULL) { while ((env = envp[index++]) != NULL) {
if (strncmp(env, "ALF_", 4) == 0) { if (strncmp(env, "ALF_", 4) == 0) {
@ -367,10 +367,21 @@ void check_environment_vars(char **envp) {
while (match == 0 && afl_environment_variables[i] != NULL) while (match == 0 && afl_environment_variables[i] != NULL)
if (strncmp(env, afl_environment_variables[i], if (strncmp(env, afl_environment_variables[i],
strlen(afl_environment_variables[i])) == 0 && strlen(afl_environment_variables[i])) == 0 &&
env[strlen(afl_environment_variables[i])] == '=') env[strlen(afl_environment_variables[i])] == '=') {
match = 1; match = 1;
else if ((val = getenv(afl_environment_variables[i])) && !*val)
WARNF(
"AFL environment variable %s defined but is empty, this can "
"lead to unexpected consequences",
afl_environment_variables[i]);
} else {
i++; i++;
}
if (match == 0) { if (match == 0) {
WARNF("Mistyped AFL environment variable: %s", env); WARNF("Mistyped AFL environment variable: %s", env);