DeforaNetworks/zzuf
3
0
Fork 0
Code Releases Activity

sys: unsatisfying workaround for an issue with libasan.

Browse Source
This commit is contained in:
Sam Hocevar 2015-01-29 09:34:18 +01:00
parent 923fffb27f
commit 73ec5ee6e4
1 changed files with 24 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/libzzuf/sys.c
View File

@ -51,6 +51,10 @@ void *_zz_dl_lib = RTLD_NEXT;
static void insert_funcs(void);
#endif
#if __GNUC__ || __clang__
extern void __asan_init_v3(void) __attribute__((weak));
#endif
void _zz_sys_init(void)
{
#if defined HAVE_WINDOWS_H
@ -62,15 +66,27 @@ void _zz_sys_init(void)
* way we are sure that the symbols we load are the most recent version,
* or we may get weird problems. We choose fileno as a random symbol to
* get, because we know we don't divert it. */
# if HAVE_DLADDR
Dl_info di;
if (dladdr(&fileno, &di) != 0)
{
void *lib = dlopen(di.dli_fname, RTLD_NOW);
if (lib)
_zz_dl_lib = lib;
}
# if __GNUC__ || __clang__
/* XXX: for some reason we conflict with libasan. We would like to avoid
* RTLD_NEXT because it causes problems with versioned symbols. However,
* if we do that, libasan enters infinite recursion. So we just disable
* this workaround if libasan is detected.
* If we don’t do this, here’s a program that crashes when fuzzed:
* echo 'int main() {}' | gcc -xc -g -ggdb -fsanitize=address - */
if (&__asan_init_v3 == NULL)
# endif
{
# if HAVE_DLADDR
Dl_info di;
if (dladdr(&fprintf, &di) != 0)
{
void *lib = dlopen(di.dli_fname, RTLD_NOW);
if (lib)
_zz_dl_lib = lib;
}
# endif
}
#else
/* Nothing to do on our platform */
#endif