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Add AFL_FORK_SERVER_KILL_SIGNAL environment variable.

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The AFL_FORK_SERVER_KILL_SIGNAL variable allows to configure the signal
used to kill the fork server on termination.
This commit is contained in:
Nils Bars
2022-10-21 12:13:43 +02:00
parent f84ea69660
commit 7512316b46
13 changed files with 58 additions and 45 deletions
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33
src/afl-common.c
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@ -456,38 +456,24 @@ u8 *find_afl_binary(u8 *own_loc, u8 *fname) {
}
/* Parses the kill signal environment variable, FATALs on error.
If the env is not set, sets the env to default_signal for the signal handlers
and returns the default_signal. */
int parse_afl_kill_signal_env(u8 *afl_kill_signal_env, int default_signal) {
if (afl_kill_signal_env && afl_kill_signal_env[0]) {
int parse_afl_kill_signal(u8 *numeric_signal_as_str, int default_signal) {
if (numeric_signal_as_str && numeric_signal_as_str[0]) {
char *endptr;
u8 signal_code;
signal_code = (u8)strtoul(afl_kill_signal_env, &endptr, 10);
signal_code = (u8)strtoul(numeric_signal_as_str, &endptr, 10);
/* Did we manage to parse the full string? */
if (*endptr != '\0' || endptr == (char *)afl_kill_signal_env) {
FATAL("Invalid AFL_KILL_SIGNAL: %s (expected unsigned int)",
afl_kill_signal_env);
if (*endptr != '\0' || endptr == (char *)numeric_signal_as_str) {
FATAL("Invalid signal name: %s", numeric_signal_as_str);
} else {
return signal_code;
}
return signal_code;
} else {
char *sigstr = alloc_printf("%d", default_signal);
if (!sigstr) { FATAL("Failed to alloc mem for signal buf"); }
/* Set the env for signal handler */
setenv("AFL_KILL_SIGNAL", sigstr, 1);
free(sigstr);
return default_signal;
}
return default_signal;
}
static inline unsigned int helper_min3(unsigned int a, unsigned int b,
@ -1253,4 +1239,3 @@ s32 create_file(u8 *fn) {
return fd;
}