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Fix LeakSanitizer Usage.

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Previously, __lsan_do_leak_check() was run when using __AFL_LEAK_CHECK,
however this was the incorrect function to use. According to the
documentation: "Subsequent calls to this function will have no effect
and end-of-process leak check will not run".
This meant that if the memory did not leak on the first usage of
__AFL_LEAK_CHECK, subsquent calls to this macro would never do anything.

Likewise, it is not possible to use an LSAN suppression list with
symbolize=0, so instead __lsan_disable and __lsan_enable are used to
'ignore' certain memory allocations where needed.
This commit is contained in:
Joshua Rogers
2021-12-30 02:54:40 +01:00
parent 02082bcd2e
commit 09c4d9ed75
3 changed files with 11 additions and 4 deletions
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5
src/afl-cc.c
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@ -876,7 +876,10 @@ static void edit_params(u32 argc, char **argv, char **envp) {
cc_params[cc_par_cnt++] = "-fsanitize=leak";
cc_params[cc_par_cnt++] = "-includesanitizer/lsan_interface.h";
cc_params[cc_par_cnt++] = "-D__AFL_LEAK_CHECK()=__lsan_do_leak_check()";
cc_params[cc_par_cnt++] = "-D__AFL_LEAK_CHECK()={if(__lsan_do_recoverable_leak_check() > 0) _exit(23); }";
cc_params[cc_par_cnt++] = "-D__AFL_LSAN_OFF()=__lsan_disable();";
cc_params[cc_par_cnt++] = "-D__AFL_LSAN_ON()=__lsan_disable();";
}