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Add AFL_NYX_LOG to redirect NYX hprintf messages to a file.

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This commit is contained in:
Jesse Schwartzentruber
2023-08-04 15:29:10 -04:00
parent 738a6c0731
commit 247d8539fe
4 changed files with 22 additions and 0 deletions
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1
include/envs.h
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@ -191,6 +191,7 @@ static char *afl_environment_variables[] = {
"AFL_NOOPT", "AFL_NOOPT",
"AFL_NYX_AUX_SIZE", "AFL_NYX_AUX_SIZE",
"AFL_NYX_DISABLE_SNAPSHOT_MODE", "AFL_NYX_DISABLE_SNAPSHOT_MODE",
"AFL_NYX_LOG",
"AFL_NYX_REUSE_SNAPSHOT", "AFL_NYX_REUSE_SNAPSHOT",
"AFL_PASSTHROUGH", "AFL_PASSTHROUGH",
"AFL_PATH", "AFL_PATH",

1
include/forkserver.h
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@ -199,6 +199,7 @@ typedef struct afl_forkserver {
char *nyx_aux_string; char *nyx_aux_string;
bool nyx_use_tmp_workdir; bool nyx_use_tmp_workdir;
char *nyx_tmp_workdir_path; char *nyx_tmp_workdir_path;
s32 nyx_log_fd;
#endif #endif
} afl_forkserver_t; } afl_forkserver_t;

19
src/afl-forkserver.c
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@ -164,6 +164,8 @@ void afl_nyx_runner_kill(afl_forkserver_t *fsrv) {
} }
if (fsrv->nyx_log_fd >= 0) { close(fsrv->nyx_log_fd); }
} }
} }
@ -218,6 +220,7 @@ void afl_fsrv_init(afl_forkserver_t *fsrv) {
fsrv->nyx_bind_cpu_id = 0xFFFFFFFF; fsrv->nyx_bind_cpu_id = 0xFFFFFFFF;
fsrv->nyx_use_tmp_workdir = false; fsrv->nyx_use_tmp_workdir = false;
fsrv->nyx_tmp_workdir_path = NULL; fsrv->nyx_tmp_workdir_path = NULL;
fsrv->nyx_log_fd = -1;
#endif #endif
// this structure needs default so we initialize it if this was not done // this structure needs default so we initialize it if this was not done
@ -575,6 +578,22 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
fsrv->nyx_handlers->nyx_config_set_input_buffer_write_protection(nyx_config, fsrv->nyx_handlers->nyx_config_set_input_buffer_write_protection(nyx_config,
true); true);
char *nyx_log_path = getenv("AFL_NYX_LOG");
if (nyx_log_path) {
fsrv->nyx_log_fd =
open(nyx_log_path, O_CREAT | O_TRUNC | O_WRONLY, DEFAULT_PERMISSION);
if (fsrv->nyx_log_fd < 0) {
NYX_PRE_FATAL(fsrv, "AFL_NYX_LOG path could not be written");
}
fsrv->nyx_handlers->nyx_config_set_hprintf_fd(nyx_config,
fsrv->nyx_log_fd);
}
if (fsrv->nyx_standalone) { if (fsrv->nyx_standalone) {
fsrv->nyx_handlers->nyx_config_set_process_role(nyx_config, StandAlone); fsrv->nyx_handlers->nyx_config_set_process_role(nyx_config, StandAlone);

1
src/afl-fuzz.c
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@ -303,6 +303,7 @@ static void usage(u8 *argv0, int more_help) {
" Increase this value in case the crash reports are truncated.\n" " Increase this value in case the crash reports are truncated.\n"
" Default value is 4096.\n" " Default value is 4096.\n"
"AFL_NYX_DISABLE_SNAPSHOT_MODE: disable snapshot mode (must be supported by the agent)\n" "AFL_NYX_DISABLE_SNAPSHOT_MODE: disable snapshot mode (must be supported by the agent)\n"
"AFL_NYX_LOG: output NYX hprintf messages to another file\n"
"AFL_NYX_REUSE_SNAPSHOT: reuse an existing Nyx root snapshot\n" "AFL_NYX_REUSE_SNAPSHOT: reuse an existing Nyx root snapshot\n"
DYN_COLOR DYN_COLOR