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Add support for standalone leak-sanitizer, introducting the environment

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variable AFL_USE_LSAN.

AFL_USE_LSAN introduces the macro __AFL_CHECK_LEAK() which will check
for a memory leak when the macro is run. This is especially helpful
when using __AFL_LOOP().

If __AFL_LEAK_CHECK() is not used when AFL_USE_LSAN=1 is set,
the leak checker will run when the program exits.
This commit is contained in:
Joshua Rogers
2021-04-02 22:23:11 +00:00
parent e98cd00822
commit 920e9402a4
14 changed files with 120 additions and 17 deletions
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17
src/afl-forkserver.c
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@ -483,7 +483,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
if (!getenv("LD_BIND_LAZY")) { setenv("LD_BIND_NOW", "1", 1); }
/* Set sane defaults for ASAN if nothing else specified. */
/* Set sane defaults for ASAN if nothing else is specified. */
if (!getenv("ASAN_OPTIONS"))
setenv("ASAN_OPTIONS",
@ -500,7 +500,7 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"handle_sigill=0",
1);
/* Set sane defaults for UBSAN if nothing else specified. */
/* Set sane defaults for UBSAN if nothing else is specified. */
if (!getenv("UBSAN_OPTIONS"))
setenv("UBSAN_OPTIONS",
@ -538,6 +538,14 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
"handle_sigill=0",
1);
/* LSAN, too, does not support abort_on_error=1. */
if (!getenv("LSAN_OPTIONS"))
setenv("LSAN_OPTIONS",
"exitcode=" STRINGIFY(LSAN_ERROR) ":"
"fast_unwind_on_malloc=0",
1);
fsrv->init_child_func(fsrv, argv);
/* Use a distinctive bitmap signature to tell the parent about execv()
@ -1210,8 +1218,9 @@ fsrv_run_result_t afl_fsrv_run_target(afl_forkserver_t *fsrv, u32 timeout,
if (unlikely(
/* A normal crash/abort */
(WIFSIGNALED(fsrv->child_status)) ||
/* special handling for msan */
(fsrv->uses_asan && WEXITSTATUS(fsrv->child_status) == MSAN_ERROR) ||
/* special handling for msan and lsan */
(fsrv->uses_asan && (WEXITSTATUS(fsrv->child_status) == MSAN_ERROR ||
WEXITSTATUS(fsrv->child_status) == LSAN_ERROR)) ||
/* the custom crash_exitcode was returned by the target */
(fsrv->uses_crash_exitcode &&
WEXITSTATUS(fsrv->child_status) == fsrv->crash_exitcode))) {