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Improved error messaging when unable to communicate with the fork server

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Matt C
2019-10-01 16:00:40 -04:00
parent 8e2ee30c47
commit 8eafa90105
1 changed files with 10 additions and 1 deletions
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11
src/afl-fuzz-run.c
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@ -178,7 +178,16 @@ u8 run_target(char** argv, u32 timeout) {
if ((res = read(fsrv_st_fd, &status, 4)) != 4) {
if (stop_soon) return 0;
RPFATAL(res, "Unable to communicate with fork server (OOM?)");
SAYF("\n" cLRD "[-] " cRST
"Unable to communicate with fork server. Some possible reasons:\n\n"
" - You've run out of memory. Use -m to increase the the memory limit\n"
" to something higher than %lld.\n"
" - The binary or one of the libraries it uses manages to create\n"
" threads before the forkserver initializes.\n"
" - The binary, at least in some circumstances, exits in a way that\n"
" also kills the parent process - raise() could be the culprit.\n\n"
"If all else fails you can disable the fork server via AFL_NO_FORKSRV=1.\n", mem_limit);
RPFATAL(res, "Unable to communicate with fork server");
}