diff options
Diffstat (limited to 'src/afl-forkserver.c')
| -rw-r--r-- | src/afl-forkserver.c | 124 |
1 files changed, 80 insertions, 44 deletions
diff --git a/src/afl-forkserver.c b/src/afl-forkserver.c index 4e4f92d6..979d7e9e 100644 --- a/src/afl-forkserver.c +++ b/src/afl-forkserver.c @@ -499,27 +499,28 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, /* This should improve performance a bit, since it stops the linker from doing extra work post-fork(). */ - if (!getenv("LD_BIND_LAZY")) { setenv("LD_BIND_NOW", "1", 0); } + if (!getenv("LD_BIND_LAZY")) { setenv("LD_BIND_NOW", "1", 1); } /* Set sane defaults for ASAN if nothing else specified. */ - if (fsrv->debug == true && !getenv("ASAN_OPTIONS")) + if (!getenv("ASAN_OPTIONS")) setenv("ASAN_OPTIONS", "abort_on_error=1:" "detect_leaks=0:" "malloc_context_size=0:" "symbolize=0:" "allocator_may_return_null=1:" + "detect_odr_violation=0:" "handle_segv=0:" "handle_sigbus=0:" "handle_abort=0:" "handle_sigfpe=0:" "handle_sigill=0", - 0); + 1); /* Set sane defaults for UBSAN if nothing else specified. */ - if (fsrv->debug == true && !getenv("UBSAN_OPTIONS")) + if (!getenv("UBSAN_OPTIONS")) setenv("UBSAN_OPTIONS", "halt_on_error=1:" "abort_on_error=1:" @@ -531,7 +532,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "handle_abort=0:" "handle_sigfpe=0:" "handle_sigill=0", - 0); + 1); /* Envs for QASan */ setenv("QASAN_MAX_CALL_STACK", "0", 0); @@ -540,7 +541,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, /* MSAN is tricky, because it doesn't support abort_on_error=1 at this point. So, we do this in a very hacky way. */ - if (fsrv->debug == true && !getenv("MSAN_OPTIONS")) + if (!getenv("MSAN_OPTIONS")) setenv("MSAN_OPTIONS", "exit_code=" STRINGIFY(MSAN_ERROR) ":" "symbolize=0:" @@ -553,7 +554,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "handle_abort=0:" "handle_sigfpe=0:" "handle_sigill=0", - 0); + 1); fsrv->init_child_func(fsrv, argv); @@ -674,11 +675,11 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, if (!fsrv->map_size) { fsrv->map_size = MAP_SIZE; } - if (unlikely(tmp_map_size % 32)) { + if (unlikely(tmp_map_size % 64)) { // should not happen WARNF("Target reported non-aligned map size of %u", tmp_map_size); - tmp_map_size = (((tmp_map_size + 31) >> 5) << 5); + tmp_map_size = (((tmp_map_size + 63) >> 6) << 6); } @@ -826,7 +827,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "have a\n" " restrictive memory limit configured, this is expected; please " "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); } else if (!fsrv->mem_limit) { @@ -834,18 +835,21 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, SAYF("\n" cLRD "[-] " cRST "Whoops, the target binary crashed suddenly, " "before receiving any input\n" - " from the fuzzer! There are several probable explanations:\n\n" - - " - The target binary requires a large map and crashes before " - "reporting.\n" - " Set a high value (e.g. AFL_MAP_SIZE=1024000) or use " - "AFL_DEBUG=1 to see the\n" - " message from the target 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" + " from the fuzzer! You can try the following:\n\n" + + " - The target binary crashes because necessary runtime " + "conditions 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" MSG_FORK_ON_APPLE @@ -861,13 +865,17 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, SAYF("\n" cLRD "[-] " cRST "Whoops, the target binary crashed suddenly, " "before receiving any input\n" - " from the fuzzer! There are several probable explanations:\n\n" - - " - The target binary requires a large map and crashes before " - "reporting.\n" - " Set a high value (e.g. AFL_MAP_SIZE=1024000) or use " - "AFL_DEBUG=1 to see the\n" - " message from the target binary\n\n" + " from the fuzzer! You can try the following:\n\n" + + " - The target binary crashes because necessary runtime " + "conditions 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" " - The current memory limit (%s) is too restrictive, causing " "the\n" @@ -885,13 +893,12 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, " estimate the required amount of virtual memory for the " "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 + " - 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 " "options\n" " fail, poke <afl-users@googlegroups.com> for troubleshooting " @@ -920,16 +927,30 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "with ASAN and\n" " you have a restrictive memory limit configured, this is " "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); } else if (!fsrv->mem_limit) { SAYF("\n" cLRD "[-] " cRST - "Hmm, looks like the target binary terminated before we could" - " complete a handshake with the injected code.\n" - "If the target was compiled with afl-clang-lto and AFL_LLVM_MAP_ADDR" - " then recompiling without this parameter.\n" + "Hmm, looks like the target binary terminated before we could complete" + " a\n" + "handshake with the injected code. You can try the following:\n\n" + + " - The target binary crashes because necessary runtime conditions " + "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" "Poke <afl-users@googlegroups.com> for troubleshooting tips.\n"); @@ -941,10 +962,24 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "\n" cLRD "[-] " cRST "Hmm, looks like the target binary terminated " "before we could complete a\n" - " handshake with the injected code. There are %s probable " - "explanations:\n\n" + " handshake with the injected code. You can try the following:\n\n" "%s" + + " - The target binary crashes because necessary runtime conditions " + "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" + " - The current memory limit (%s) is too restrictive, causing an " "OOM\n" " fault in the dynamic linker. This can be fixed with the -m " @@ -968,7 +1003,6 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv, "options\n" " fail, poke <afl-users@googlegroups.com> for troubleshooting " "tips.\n", - getenv(DEFER_ENV_VAR) ? "three" : "two", getenv(DEFER_ENV_VAR) ? " - You are using deferred forkserver, but __AFL_INIT() is " "never\n" @@ -1073,12 +1107,14 @@ void afl_fsrv_write_to_testcase(afl_forkserver_t *fsrv, u8 *buf, size_t len) { if (unlikely(fsrv->no_unlink)) { - fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_TRUNC, 0600); + fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_TRUNC, + DEFAULT_PERMISSION); } else { unlink(fsrv->out_file); /* Ignore errors. */ - fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_EXCL, 0600); + fd = open(fsrv->out_file, O_WRONLY | O_CREAT | O_EXCL, + DEFAULT_PERMISSION); } |