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better forkserver error help and code format

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This commit is contained in:
vanhauser-thc
2021-03-24 09:41:40 +01:00
parent 2fef89950f
commit 70c1de5d64
5 changed files with 83 additions and 46 deletions
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98
src/afl-forkserver.c
View File

@ -809,7 +809,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"have a\n" "have a\n"
" restrictive memory limit configured, this is expected; please " " restrictive memory limit configured, this is expected; please "
"read\n" "read\n"
" %s/notes_for_asan.md for help.\n", " %s/notes_for_asan.md for help and run with '-m 0'.\n",
doc_path); doc_path);
} else if (!fsrv->mem_limit) { } else if (!fsrv->mem_limit) {
@ -817,18 +817,21 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
SAYF("\n" cLRD "[-] " cRST SAYF("\n" cLRD "[-] " cRST
"Whoops, the target binary crashed suddenly, " "Whoops, the target binary crashed suddenly, "
"before receiving any input\n" "before receiving any input\n"
" from the fuzzer! There are several probable explanations:\n\n" " from the fuzzer! You can try the following:\n\n"
" - The target binary requires a large map and crashes before " " - The target binary crashes because necessary runtime "
"reporting.\n" "conditions it needs\n"
" Set a high value (e.g. AFL_MAP_SIZE=8000000) or use " " are not met. Try to:\n"
"AFL_DEBUG=1 to see the\n" " 1. Run again with AFL_DEBUG=1 set and check the output of "
" message from the target binary\n\n" "the target\n"
" binary for clues.\n"
" 2. Run again with AFL_DEBUG=1 and 'ulimit -c unlimited' and "
"analyze the\n"
" generated core dump.\n\n"
" - The binary is just buggy and explodes entirely on its own. " " - Possibly the target requires a huge coverage map and has "
"If so, you\n" "CTORS.\n"
" need to fix the underlying problem or find a better " " Retry with setting AFL_MAP_SIZE=10000000.\n\n"
"replacement.\n\n"
MSG_FORK_ON_APPLE MSG_FORK_ON_APPLE
@ -844,13 +847,17 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
SAYF("\n" cLRD "[-] " cRST SAYF("\n" cLRD "[-] " cRST
"Whoops, the target binary crashed suddenly, " "Whoops, the target binary crashed suddenly, "
"before receiving any input\n" "before receiving any input\n"
" from the fuzzer! There are several probable explanations:\n\n" " from the fuzzer! You can try the following:\n\n"
" - The target binary requires a large map and crashes before " " - The target binary crashes because necessary runtime "
"reporting.\n" "conditions it needs\n"
" Set a high value (e.g. AFL_MAP_SIZE=8000000) or use " " are not met. Try to:\n"
"AFL_DEBUG=1 to see the\n" " 1. Run again with AFL_DEBUG=1 set and check the output of "
" message from the target binary\n\n" "the target\n"
" binary for clues.\n"
" 2. Run again with AFL_DEBUG=1 and 'ulimit -c unlimited' and "
"analyze the\n"
" generated core dump.\n\n"
" - The current memory limit (%s) is too restrictive, causing " " - The current memory limit (%s) is too restrictive, causing "
"the\n" "the\n"
@ -868,13 +875,12 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
" estimate the required amount of virtual memory for the " " estimate the required amount of virtual memory for the "
"binary.\n\n" "binary.\n\n"
" - The binary is just buggy and explodes entirely on its own. "
"If so, you\n"
" need to fix the underlying problem or find a better "
"replacement.\n\n"
MSG_FORK_ON_APPLE MSG_FORK_ON_APPLE
" - Possibly the target requires a huge coverage map and has "
"CTORS.\n"
" Retry with setting AFL_MAP_SIZE=10000000.\n\n"
" - Less likely, there is a horrible bug in the fuzzer. If other " " - Less likely, there is a horrible bug in the fuzzer. If other "
"options\n" "options\n"
" fail, poke <afl-users@googlegroups.com> for troubleshooting " " fail, poke <afl-users@googlegroups.com> for troubleshooting "
@ -903,7 +909,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"with ASAN and\n" "with ASAN and\n"
" you have a restrictive memory limit configured, this is " " you have a restrictive memory limit configured, this is "
"expected; please\n" "expected; please\n"
" read %s/notes_for_asan.md for help.\n", " read %s/notes_for_asan.md for help and run with '-m 0'.\n",
doc_path); doc_path);
} else if (!fsrv->mem_limit) { } else if (!fsrv->mem_limit) {
@ -911,10 +917,22 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
SAYF("\n" cLRD "[-] " cRST SAYF("\n" cLRD "[-] " cRST
"Hmm, looks like the target binary terminated before we could complete" "Hmm, looks like the target binary terminated before we could complete"
" a\n" " a\n"
"handshake with the injected code.\n" "handshake with the injected code. You can try the following:\n\n"
"Most likely the target has a huge coverage map, retry with setting"
" the\n" " - The target binary crashes because necessary runtime conditions "
"environment variable AFL_MAP_SIZE=8000000\n" "it needs\n"
" are not met. Try to:\n"
" 1. Run again with AFL_DEBUG=1 set and check the output of the "
"target\n"
" binary for clues.\n"
" 2. Run again with AFL_DEBUG=1 and 'ulimit -c unlimited' and "
"analyze the\n"
" generated core dump.\n\n"
" - Possibly the target requires a huge coverage map and has "
"CTORS.\n"
" Retry with setting AFL_MAP_SIZE=10000000.\n\n"
"Otherwise there is a horrible bug in the fuzzer.\n" "Otherwise there is a horrible bug in the fuzzer.\n"
"Poke <afl-users@googlegroups.com> for troubleshooting tips.\n"); "Poke <afl-users@googlegroups.com> for troubleshooting tips.\n");
@ -926,14 +944,23 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"\n" cLRD "[-] " cRST "\n" cLRD "[-] " cRST
"Hmm, looks like the target binary terminated " "Hmm, looks like the target binary terminated "
"before we could complete a\n" "before we could complete a\n"
" handshake with the injected code. There are %s probable " " handshake with the injected code. You can try the following:\n\n"
"explanations:\n\n"
"%s" "%s"
" - Most likely the target has a huge coverage map, retry with " " - The target binary crashes because necessary runtime conditions "
"setting the\n" "it needs\n"
" environment variable AFL_MAP_SIZE=8000000\n\n" " are not met. Try to:\n"
" 1. Run again with AFL_DEBUG=1 set and check the output of the "
"target\n"
" binary for clues.\n"
" 2. Run again with AFL_DEBUG=1 and 'ulimit -c unlimited' and "
"analyze the\n"
" generated core dump.\n\n"
" - Possibly the target requires a huge coverage map and has "
"CTORS.\n"
" Retry with setting AFL_MAP_SIZE=10000000.\n\n"
" - The current memory limit (%s) is too restrictive, causing an " " - The current memory limit (%s) is too restrictive, causing an "
"OOM\n" "OOM\n"
@ -958,7 +985,6 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"options\n" "options\n"
" fail, poke <afl-users@googlegroups.com> for troubleshooting " " fail, poke <afl-users@googlegroups.com> for troubleshooting "
"tips.\n", "tips.\n",
getenv(DEFER_ENV_VAR) ? "three" : "two",
getenv(DEFER_ENV_VAR) getenv(DEFER_ENV_VAR)
? " - You are using deferred forkserver, but __AFL_INIT() is " ? " - You are using deferred forkserver, but __AFL_INIT() is "
"never\n" "never\n"
@ -1038,12 +1064,14 @@ void afl_fsrv_write_to_testcase(afl_forkserver_t *fsrv, u8 *buf, size_t len) {
if (unlikely(fsrv->no_unlink)) { if (unlikely(fsrv->no_unlink)) {
fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_TRUNC, DEFAULT_PERMISSION); fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_TRUNC,
DEFAULT_PERMISSION);
} else { } else {
unlink(fsrv->out_file); /* Ignore errors. */ unlink(fsrv->out_file); /* Ignore errors. */
fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_EXCL, DEFAULT_PERMISSION); fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_EXCL,
DEFAULT_PERMISSION);
} }

6
src/afl-fuzz-init.c
View File

@ -152,7 +152,8 @@ void bind_to_free_cpu(afl_state_t *afl) {
do { do {
if ((lockfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION)) < 0) { if ((lockfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL,
DEFAULT_PERMISSION)) < 0) {
if (first) { if (first) {
@ -2092,7 +2093,8 @@ void setup_stdio_file(afl_state_t *afl) {
unlink(afl->fsrv.out_file); /* Ignore errors */ unlink(afl->fsrv.out_file); /* Ignore errors */
afl->fsrv.out_fd = open(afl->fsrv.out_file, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION); afl->fsrv.out_fd =
open(afl->fsrv.out_file, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION);
if (afl->fsrv.out_fd < 0) { if (afl->fsrv.out_fd < 0) {

12
src/afl-fuzz-run.c
View File

@ -83,7 +83,8 @@ write_to_testcase(afl_state_t *afl, void *mem, u32 len) {
afl->document_counter++, afl->document_counter++,
describe_op(afl, 0, NAME_MAX - strlen("000000000:"))); describe_op(afl, 0, NAME_MAX - strlen("000000000:")));
if ((doc_fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, DEFAULT_PERMISSION)) >= 0) { if ((doc_fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, DEFAULT_PERMISSION)) >=
0) {
if (write(doc_fd, mem, len) != len) if (write(doc_fd, mem, len) != len)
PFATAL("write to mutation file failed: %s", fn); PFATAL("write to mutation file failed: %s", fn);
@ -247,12 +248,14 @@ static void write_with_gap(afl_state_t *afl, u8 *mem, u32 len, u32 skip_at,
if (unlikely(afl->no_unlink)) { if (unlikely(afl->no_unlink)) {
fd = open(afl->fsrv.out_file, O_WRONLY | O_CREAT | O_TRUNC, DEFAULT_PERMISSION); fd = open(afl->fsrv.out_file, O_WRONLY | O_CREAT | O_TRUNC,
DEFAULT_PERMISSION);
} else { } else {
unlink(afl->fsrv.out_file); /* Ignore errors. */ unlink(afl->fsrv.out_file); /* Ignore errors. */
fd = open(afl->fsrv.out_file, O_WRONLY | O_CREAT | O_EXCL, DEFAULT_PERMISSION); fd = open(afl->fsrv.out_file, O_WRONLY | O_CREAT | O_EXCL,
DEFAULT_PERMISSION);
} }
@ -564,7 +567,8 @@ void sync_fuzzers(afl_state_t *afl) {
/* document the attempt to sync to this instance */ /* document the attempt to sync to this instance */
sprintf(qd_synced_path, "%s/.synced/%s.last", afl->out_dir, sd_ent->d_name); sprintf(qd_synced_path, "%s/.synced/%s.last", afl->out_dir, sd_ent->d_name);
id_fd = open(qd_synced_path, O_RDWR | O_CREAT | O_TRUNC, DEFAULT_PERMISSION); id_fd =
open(qd_synced_path, O_RDWR | O_CREAT | O_TRUNC, DEFAULT_PERMISSION);
if (id_fd >= 0) close(id_fd); if (id_fd >= 0) close(id_fd);
/* Skip anything that doesn't have a queue/ subdirectory. */ /* Skip anything that doesn't have a queue/ subdirectory. */

10
src/afl-sharedmem.c
View File

@ -162,8 +162,8 @@ u8 *afl_shm_init(sharedmem_t *shm, size_t map_size,
snprintf(shm->g_shm_file_path, L_tmpnam, "/afl_%d_%ld", getpid(), random()); snprintf(shm->g_shm_file_path, L_tmpnam, "/afl_%d_%ld", getpid(), random());
/* create the shared memory segment as if it was a file */ /* create the shared memory segment as if it was a file */
shm->g_shm_fd = shm->g_shm_fd = shm_open(shm->g_shm_file_path, O_CREAT | O_RDWR | O_EXCL,
shm_open(shm->g_shm_file_path, O_CREAT | O_RDWR | O_EXCL, DEFAULT_PERMISSION); DEFAULT_PERMISSION);
if (shm->g_shm_fd == -1) { PFATAL("shm_open() failed"); } if (shm->g_shm_fd == -1) { PFATAL("shm_open() failed"); }
/* configure the size of the shared memory segment */ /* configure the size of the shared memory segment */
@ -202,7 +202,8 @@ u8 *afl_shm_init(sharedmem_t *shm, size_t map_size,
/* create the shared memory segment as if it was a file */ /* create the shared memory segment as if it was a file */
shm->cmplog_g_shm_fd = shm->cmplog_g_shm_fd =
shm_open(shm->cmplog_g_shm_file_path, O_CREAT | O_RDWR | O_EXCL, DEFAULT_PERMISSION); shm_open(shm->cmplog_g_shm_file_path, O_CREAT | O_RDWR | O_EXCL,
DEFAULT_PERMISSION);
if (shm->cmplog_g_shm_fd == -1) { PFATAL("shm_open() failed"); } if (shm->cmplog_g_shm_fd == -1) { PFATAL("shm_open() failed"); }
/* configure the size of the shared memory segment */ /* configure the size of the shared memory segment */
@ -241,7 +242,8 @@ u8 *afl_shm_init(sharedmem_t *shm, size_t map_size,
#else #else
u8 *shm_str; u8 *shm_str;
shm->shm_id = shmget(IPC_PRIVATE, map_size, IPC_CREAT | IPC_EXCL | DEFAULT_PERMISSION); shm->shm_id =
shmget(IPC_PRIVATE, map_size, IPC_CREAT | IPC_EXCL | DEFAULT_PERMISSION);
if (shm->shm_id < 0) { PFATAL("shmget() failed"); } if (shm->shm_id < 0) { PFATAL("shmget() failed"); }
if (shm->cmplog_mode) { if (shm->cmplog_mode) {

3
src/afl-showmap.c
View File

@ -1119,7 +1119,8 @@ int main(int argc, char **argv_orig, char **envp) {
unlink(stdin_file); unlink(stdin_file);
atexit(at_exit_handler); atexit(at_exit_handler);
fsrv->out_file = stdin_file; fsrv->out_file = stdin_file;
fsrv->out_fd = open(stdin_file, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION); fsrv->out_fd =
open(stdin_file, O_RDWR | O_CREAT | O_EXCL, DEFAULT_PERMISSION);
if (fsrv->out_fd < 0) { PFATAL("Unable to create '%s'", out_file); } if (fsrv->out_fd < 0) { PFATAL("Unable to create '%s'", out_file); }
if (arg_offset && use_argv[arg_offset] != stdin_file) { if (arg_offset && use_argv[arg_offset] != stdin_file) {