this was an optimization to save/recover a minimal amount of extra
memory for use by malloc, that's becoming increasingly costly to keep
around. freeing this data:
1. breaks debugging with gdb (it can't find library symbols)
2. breaks thread-local storage in shared libraries
it would be possible to disable freeing when TLS is used, but in
addition to the above breakages, tracking whether dlopen/dlsym is used
adds a cost to every symbol lookup, possibly making program startup
slower for large programs. combined with the complexity, it's not
worth it. we already save/recover plenty of memory in the dynamic
linker with reclaim_gaps.
static struct dso *head, *tail, *libc;
static char *env_path, *sys_path, *r_path;
static struct dso *head, *tail, *libc;
static char *env_path, *sys_path, *r_path;
static int ssp_used;
static int runtime;
static int ldd_mode;
static int ssp_used;
static int runtime;
static int ldd_mode;
void *def = 0;
if (dso->ghashtab) {
gh = gnu_hash(s);
void *def = 0;
if (dso->ghashtab) {
gh = gnu_hash(s);
- if (gh == 0xf9040207 && !strcmp(s, "dlopen")) rtld_used = 1;
- if (gh == 0xf4dc4ae && !strcmp(s, "dlsym")) rtld_used = 1;
if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
} else {
h = sysv_hash(s);
if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
} else {
h = sysv_hash(s);
- if (h == 0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
- if (h == 0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
}
for (; dso; dso=dso->next) {
if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
}
for (; dso; dso=dso->next) {
- if (!rtld_used) {
- free_all(head);
- free(sys_path);
- reclaim((void *)builtin_dsos, 0, sizeof builtin_dsos);
- }
-
errno = 0;
return (void *)aux[AT_ENTRY];
}
errno = 0;
return (void *)aux[AT_ENTRY];
}