ExternalVendorCode/AFLplusplus
1
0
Fork 0
mirror of https://github.com/AFLplusplus/AFLplusplus.git synced 2025-06-19 13:03:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

dynamic symbols export for dlopen

Browse Source
This commit is contained in:
Andrea Fioraldi
2020-08-05 12:53:46 +02:00
parent 9864d9c189
commit 19631851f6
2 changed files with 22 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
dynamic_list.txt Normal file
View File

@ -0,0 +1,8 @@
{
"__afl_area_ptr";
"__afl_manual_init";
"__afl_persistent_loop";
"__afl_auto_init";
"__afl_area_initial";
"__afl_prev_loc";
};

17
llvm_mode/afl-clang-fast.c
View File

@ -162,7 +162,7 @@ static void find_obj(u8 *argv0) {
static void edit_params(u32 argc, char **argv, char **envp) { static void edit_params(u32 argc, char **argv, char **envp) {
u8 fortify_set = 0, asan_set = 0, x_set = 0, bit_mode = 0, u8 fortify_set = 0, asan_set = 0, x_set = 0, bit_mode = 0,
preprocessor_only = 0; shared_linking = 0, preprocessor_only = 0;
u8 have_pic = 0; u8 have_pic = 0;
u8 *name; u8 *name;
@ -402,6 +402,7 @@ static void edit_params(u32 argc, char **argv, char **envp) {
if (lto_mode && !strncmp(cur, "--ld-path=", 10)) continue; if (lto_mode && !strncmp(cur, "--ld-path=", 10)) continue;
if (!strcmp(cur, "-E")) preprocessor_only = 1; if (!strcmp(cur, "-E")) preprocessor_only = 1;
if (!strcmp(cur, "-shared")) shared_linking = 1;
cc_params[cc_par_cnt++] = cur; cc_params[cc_par_cnt++] = cur;
@ -567,12 +568,18 @@ static void edit_params(u32 argc, char **argv, char **envp) {
} }
if (preprocessor_only) { if (preprocessor_only || shared_linking) {
/* In the preprocessor_only case (-E), we are not actually compiling at /* In the preprocessor_only case (-E), we are not actually compiling at
all but requesting the compiler to output preprocessed sources only. all but requesting the compiler to output preprocessed sources only.
We must not add the runtime in this case because the compiler will We must not add the runtime in this case because the compiler will
simply output its binary content back on stdout, breaking any build simply output its binary content back on stdout, breaking any build
systems that rely on a separate source preprocessing step. */ systems that rely on a separate source preprocessing step.
The shared_linking case (-shared) is more complex. This flag should
only be passed when linking a shared object. When loading such a shared
object into a binary that has also been built with AFL, two AFL runtimes
will exist side-by-side. This is only a problem in the dynamic loading
case because for static linking, the compiler can de-duplicate the
runtime. We must hence avoid attaching the runtime to shared objects. */
cc_params[cc_par_cnt] = NULL; cc_params[cc_par_cnt] = NULL;
return; return;
} }
@ -619,6 +626,10 @@ static void edit_params(u32 argc, char **argv, char **envp) {
} }
if (!shared_linking)
cc_params[cc_par_cnt++] = alloc_printf("-Wl,--dynamic-list=%s/dynamic_list.txt", obj_path);
#endif #endif
cc_params[cc_par_cnt] = NULL; cc_params[cc_par_cnt] = NULL;