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feat: introduce GCC disable environment variable

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This change is to disable the GCC plugin version check for
GCC plugin and CMPLOG, to overcome the issues with incompatability
with expected GCC version and actual GCC version used to compile
using `AFL_GCC_DISABLE_VERSION_CHECK` environment variable.
This commit is contained in:
rapt0r
2024-10-19 22:19:41 +09:00
parent 8a060a4b68
commit c1d9a4fab9
5 changed files with 13 additions and 7 deletions
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6
include/envs.h
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@ -52,9 +52,9 @@ static char *afl_environment_variables[] = {
"AFL_FRIDA_VERBOSE", "AFL_OLD_FORKSERVER", "AFL_OPT_LEVEL",
"AFL_FUZZER_ARGS", // oss-fuzz
"AFL_FUZZER_STATS_UPDATE_INTERVAL", "AFL_GDB", "AFL_GCC_ALLOWLIST",
"AFL_GCC_DENYLIST", "AFL_GCC_BLOCKLIST", "AFL_GCC_INSTRUMENT_FILE",
"AFL_GCC_OUT_OF_LINE", "AFL_GCC_SKIP_NEVERZERO", "AFL_GCJ",
"AFL_HANG_TMOUT", "AFL_FORKSRV_INIT_TMOUT", "AFL_HARDEN",
"AFL_GCC_DENYLIST", "AFL_GCC_BLOCKLIST", "AFL_GCC_DISABLE_VERSION_CHECK",
"AFL_GCC_INSTRUMENT_FILE", "AFL_GCC_OUT_OF_LINE", "AFL_GCC_SKIP_NEVERZERO",
"AFL_GCJ", "AFL_HANG_TMOUT", "AFL_FORKSRV_INIT_TMOUT", "AFL_HARDEN",
"AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES", "AFL_IGNORE_PROBLEMS",
"AFL_IGNORE_PROBLEMS_COVERAGE", "AFL_IGNORE_SEED_PROBLEMS",
"AFL_IGNORE_TIMEOUTS", "AFL_IGNORE_UNKNOWN_ENVS", "AFL_IMPORT_FIRST",

5
instrumentation/README.gcc_plugin.md
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@ -51,7 +51,10 @@ The idea and much of the implementation comes from Laszlo Szekeres.
In order to leverage this mechanism, you need to have modern enough GCC (>=
version 4.5.0) and the plugin development headers installed on your system. That
should be all you need. On Debian machines, these headers can be acquired by
installing the `gcc-VERSION-plugin-dev` packages.
installing the `gcc-VERSION-plugin-dev` packages. If you're compiling a GCC
plugin that differs from the system-installed version and encounter issues
with version checks, you can use the `AFL_GCC_DISABLE_VERSION_CHECK` environment
variable.
To build the instrumentation itself, type `make`. This will generate binaries
called `afl-gcc-fast` and `afl-g++-fast` in the parent directory.

3
instrumentation/afl-gcc-cmplog-pass.so.cc
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@ -370,7 +370,8 @@ Set AFL_QUIET in the environment to silence it.\n\
int plugin_init(struct plugin_name_args *info,
struct plugin_gcc_version *version) {
if (!plugin_default_version_check(version, &gcc_version))
if (!plugin_default_version_check(version, &gcc_version) &&
!getenv("AFL_GCC_DISABLE_VERSION_CHECK"))
FATAL(G_("GCC and plugin have incompatible versions, expected GCC %s, "
"is %s"),
gcc_version.basever, version->basever);

3
instrumentation/afl-gcc-cmptrs-pass.so.cc
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@ -338,7 +338,8 @@ Set AFL_QUIET in the environment to silence it.\n\
int plugin_init(struct plugin_name_args *info,
struct plugin_gcc_version *version) {
if (!plugin_default_version_check(version, &gcc_version))
if (!plugin_default_version_check(version, &gcc_version) &&
!getenv("AFL_GCC_DISABLE_VERSION_CHECK"))
FATAL(G_("GCC and plugin have incompatible versions, expected GCC %s, "
"is %s"),
gcc_version.basever, version->basever);

3
instrumentation/afl-gcc-pass.so.cc
View File

@ -478,7 +478,8 @@ Specify -frandom-seed for reproducible instrumentation.\n\
int plugin_init(struct plugin_name_args *info,
struct plugin_gcc_version *version) {
if (!plugin_default_version_check(version, &gcc_version))
if (!plugin_default_version_check(version, &gcc_version) &&
!getenv("AFL_GCC_DISABLE_VERSION_CHECK"))
FATAL(G_("GCC and plugin have incompatible versions, expected GCC %s, "
"is %s"),
gcc_version.basever, version->basever);