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make nyx aux buffer size configurable

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This commit is contained in:
Sergej Schumilo
2023-08-03 14:40:10 +02:00
parent 641c551ba0
commit 8f31086a7f
4 changed files with 15 additions and 0 deletions
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1
include/envs.h
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@ -189,6 +189,7 @@ static char *afl_environment_variables[] = {
"AFL_MAX_DET_EXTRAS",
"AFL_NO_X86", // not really an env but we dont want to warn on it
"AFL_NOOPT",
"AFL_NYX_AUX_SIZE",
"AFL_PASSTHROUGH",
"AFL_PATH",
"AFL_PERFORMANCE_FILE",

1
include/forkserver.h
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@ -86,6 +86,7 @@ typedef struct {
uint32_t size);
bool (*nyx_remove_work_dir)(const char *workdir);
bool (*nyx_config_set_aux_buffer_size)(void *config, uint32_t aux_buffer_size);
} nyx_plugin_handler_t;

10
src/afl-forkserver.c
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@ -129,6 +129,9 @@ nyx_plugin_handler_t *afl_load_libnyx_plugin(u8 *libnyx_binary) {
plugin->nyx_remove_work_dir = dlsym(handle, "nyx_remove_work_dir");
if (plugin->nyx_remove_work_dir == NULL) { goto fail; }
plugin->nyx_config_set_aux_buffer_size = dlsym(handle, "nyx_config_set_aux_buffer_size");
if (plugin->nyx_config_set_aux_buffer_size == NULL) { goto fail; }
OKF("libnyx plugin is ready!");
return plugin;
@ -589,6 +592,13 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
}
if (getenv("AFL_NYX_AUX_SIZE") != NULL) {
if(fsrv->nyx_handlers->nyx_config_set_aux_buffer_size(
nyx_config, atoi(getenv("AFL_NYX_AUX_SIZE"))) != 1) {
NYX_PRE_FATAL(fsrv, "Invalid AFL_NYX_AUX_SIZE value set (must be a multiple of 4096) ...");
}
}
if (getenv("NYX_REUSE_SNAPSHOT") != NULL) {
if (access(getenv("NYX_REUSE_SNAPSHOT"), F_OK) == -1) {

3
src/afl-fuzz.c
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@ -299,6 +299,9 @@ static void usage(u8 *argv0, int more_help) {
"AFL_NO_SNAPSHOT: do not use the snapshot feature (if the snapshot lkm is loaded)\n"
"AFL_NO_STARTUP_CALIBRATION: no initial seed calibration, start fuzzing at once\n"
"AFL_NO_UI: switch status screen off\n"
"AFL_NYX_AUX_SIZE: size of the Nyx auxiliary buffer. Must be a multiple of 4096.\n"
" Increase this value in case the crash reports are truncated.\n"
" Default value is 4096.\n"
DYN_COLOR