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Allow strong symbols to override weak ones for lookups done through

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dlsym with RTLD_NEXT/RTLD_SELF handles.

Allow symbols from ld-elf.so to be located this way too.

Based on report and original patch from sobomax@.
This commit is contained in:
Alexander Kabaev 2008-10-10 00:16:32 +00:00
parent 258f85b951
commit 657d9f9ae9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=183737
1 changed files with 21 additions and 4 deletions
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25
libexec/rtld-elf/rtld.c
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@ -1925,7 +1925,7 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
{
DoneList donelist;
const Obj_Entry *obj, *defobj;
const Elf_Sym *def;
const Elf_Sym *def, *symp;
unsigned long hash;
int lockstate;
@ -1951,9 +1951,26 @@ do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve,
if (handle == RTLD_NEXT)
obj = obj->next;
for (; obj != NULL; obj = obj->next) {
if ((def = symlook_obj(name, hash, obj, ve, flags)) != NULL) {
defobj = obj;
break;
if ((symp = symlook_obj(name, hash, obj, ve, flags)) != NULL) {
if (def == NULL || ELF_ST_BIND(symp->st_info) != STB_WEAK) {
def = symp;
defobj = obj;
if (ELF_ST_BIND(def->st_info) != STB_WEAK)
break;
}
}
}
/*
* Search the dynamic linker itself, and possibly resolve the
* symbol from there. This is how the application links to
* dynamic linker services such as dlopen. Only the values listed
* in the "exports" array can be resolved from the dynamic linker.
*/
if (def == NULL || ELF_ST_BIND(def->st_info) == STB_WEAK) {
symp = symlook_obj(name, hash, &obj_rtld, ve, flags);
if (symp != NULL && is_exported(symp)) {
def = symp;
defobj = &obj_rtld;
}
}
} else {