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fix UBSAN handling, update docs

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hexcoder-
2020-02-16 10:44:53 +01:00
parent b133fa3b6e
commit 37f865ab24
5 changed files with 18 additions and 22 deletions
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5
docs/env_variables.md
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@ -25,9 +25,8 @@ tools make fairly broad use of environmental variables:
- see [notes_for_asan.md](notes_for_asan.md). - see [notes_for_asan.md](notes_for_asan.md).
(You can also enable MSAN via AFL_USE_MSAN; ASAN and MSAN come with the (You can also enable MSAN via AFL_USE_MSAN; ASAN and MSAN come with the
same gotchas; the modes are mutually exclusive. UBSAN and other exotic same gotchas; the modes are mutually exclusive. UBSAN can be enabled
sanitizers are not officially supported yet, but are easy to get to work similarly by setting the environment variable AFL_USE_UBSAN=1)
by hand.)
- Setting AFL_CC, AFL_CXX, and AFL_AS lets you use alternate downstream - Setting AFL_CC, AFL_CXX, and AFL_AS lets you use alternate downstream
compilation tools, rather than the default 'clang', 'gcc', or 'as' binaries compilation tools, rather than the default 'clang', 'gcc', or 'as' binaries

3
docs/notes_for_asan.md
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@ -136,7 +136,8 @@ istruction that will cause SIGILL (ud2 on x86) when an undefined behaviour
is detected. This is the option that you want to use when combining AFL++ is detected. This is the option that you want to use when combining AFL++
and UBSan. and UBSan.
AFL_USE_UBSAN=1 env var will add this compiler flag to afl-clang-fast for you. AFL_USE_UBSAN=1 env var will add this compiler flag to afl-clang-fast,
afl-gcc-fast and afl-gcc for you.
Old versions of UBSAN don't offer a consistent way Old versions of UBSAN don't offer a consistent way
to abort() on fault conditions or to terminate with a distinctive exit code to abort() on fault conditions or to terminate with a distinctive exit code

10
gcc_plugin/afl-gcc-fast.c
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@ -192,13 +192,13 @@ static void edit_params(u32 argc, char** argv) {
} }
if (getenv("AFL_USE_UBSAN")) { }
cc_params[cc_par_cnt++] = "-fsanitize=undefined"; if (getenv("AFL_USE_UBSAN")) {
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
} cc_params[cc_par_cnt++] = "-fsanitize=undefined";
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
} }

10
llvm_mode/afl-clang-fast.c
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@ -300,13 +300,13 @@ static void edit_params(u32 argc, char** argv) {
} }
if (getenv("AFL_USE_UBSAN")) { }
cc_params[cc_par_cnt++] = "-fsanitize=undefined"; if (getenv("AFL_USE_UBSAN")) {
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
} cc_params[cc_par_cnt++] = "-fsanitize=undefined";
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
} }

12
src/afl-gcc.c
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@ -282,15 +282,11 @@ static void edit_params(u32 argc, char** argv) {
} }
if (!asan_set) { if (getenv("AFL_USE_UBSAN")) {
if (getenv("AFL_USE_UBSAN")) { cc_params[cc_par_cnt++] = "-fsanitize=undefined";
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fsanitize=undefined"; cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
cc_params[cc_par_cnt++] = "-fsanitize-undefined-trap-on-error";
cc_params[cc_par_cnt++] = "-fno-sanitize-recover=all";
}
} }