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Merge pull request #2252 from StepanGulyaev/dev

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Added CFISAN option for verbose output on crash
This commit is contained in:
van Hauser
2024-11-21 15:51:51 +01:00
committed by GitHub
parent 701e89bbcd 46b87a6d62
commit 31c8a052a6
3 changed files with 22 additions and 7 deletions
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4
docs/env_variables.md
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@ -104,6 +104,7 @@ fairly broad use of environment variables instead:
detection)
- `AFL_USE_CFISAN=1` - activates the Control Flow Integrity sanitizer (e.g.
type confusion vulnerabilities)
- `AFL_CFISAN_VERBOSE=1` - outputs detailed information when control flow integrity violations occur, instead of simply terminating with "Illegal Instruction"
- `AFL_USE_LSAN` - activates the leak sanitizer. To perform a leak check
within your program at a certain point (such as at the end of an
`__AFL_LOOP()`), you can run the macro `__AFL_LEAK_CHECK();` which will
@ -114,6 +115,9 @@ fairly broad use of environment variables instead:
- `AFL_USE_TSAN=1` - activates the thread sanitizer to find thread race
conditions
- `AFL_USE_UBSAN=1` - activates the undefined behavior sanitizer
- `AFL_UBSAN_VERBOSE=1` - outputs detailed diagnostic information when undefined behavior is detected, instead of simply terminating with "Illegal Instruction"
- Note: both `AFL_CFISAN_VERBOSE=1` and `AFL_UBSAN_VERBOSE=1` are disabled by default as verbose output can significantly slow down fuzzing performance. Use these options only during debugging or when additional crash diagnostics are required
- `TMPDIR` is used by afl-as for temporary files; if this variable is not set,
the tool defaults to /tmp.

8
include/envs.h
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@ -114,10 +114,10 @@ static char *afl_environment_variables[] = {
"AFL_STATSD_TAGS_FLAVOR", "AFL_SYNC_TIME", "AFL_TESTCACHE_SIZE",
"AFL_TESTCACHE_ENTRIES", "AFL_TMIN_EXACT", "AFL_TMPDIR", "AFL_TOKEN_FILE",
"AFL_TRACE_PC", "AFL_USE_ASAN", "AFL_USE_MSAN", "AFL_USE_TRACE_PC",
"AFL_USE_UBSAN", "AFL_USE_TSAN", "AFL_USE_CFISAN", "AFL_USE_LSAN",
"AFL_WINE_PATH", "AFL_NO_SNAPSHOT", "AFL_EXPAND_HAVOC_NOW", "AFL_USE_FASAN",
"AFL_USE_QASAN", "AFL_PRINT_FILENAMES", "AFL_PIZZA_MODE",
"AFL_NO_FASTRESUME", NULL
"AFL_USE_UBSAN", "AFL_UBSAN_VERBOSE", "AFL_USE_TSAN", "AFL_USE_CFISAN",
"AFL_CFISAN_VERBOSE", "AFL_USE_LSAN", "AFL_WINE_PATH", "AFL_NO_SNAPSHOT",
"AFL_EXPAND_HAVOC_NOW", "AFL_USE_FASAN", "AFL_USE_QASAN",
"AFL_PRINT_FILENAMES", "AFL_PIZZA_MODE", "AFL_NO_FASTRESUME", NULL
};

17
src/afl-cc.c
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@ -1945,10 +1945,15 @@ void add_sanitizers(aflcc_state_t *aflcc, char **envp) {
if (getenv("AFL_USE_UBSAN") || aflcc->have_ubsan) {
if (!aflcc->have_ubsan) {
if (!aflcc->have_ubsan) { insert_param(aflcc, "-fsanitize=undefined"); }
insert_param(aflcc, "-fsanitize=undefined");
insert_param(aflcc, "-fno-sanitize-recover=all");
if (getenv("AFL_UBSAN_VERBOSE")) {
insert_param(aflcc, "-fno-sanitize-recover=undefined");
} else {
insert_param(aflcc, "-fsanitize-trap=undefined");
}
@ -2009,6 +2014,12 @@ void add_sanitizers(aflcc_state_t *aflcc, char **envp) {
if (!aflcc->have_cfisan) { insert_param(aflcc, "-fsanitize=cfi"); }
if (getenv("AFL_CFISAN_VERBOSE")) {
insert_param(aflcc, "-fno-sanitize-trap=cfi");
}
if (!aflcc->have_hidden) {
insert_param(aflcc, "-fvisibility=hidden");