diff options
Diffstat (limited to 'elf/dl-sym.c')
| -rw-r--r-- | elf/dl-sym.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/elf/dl-sym.c b/elf/dl-sym.c index ba00ef56f4..ca83daf21d 100644 --- a/elf/dl-sym.c +++ b/elf/dl-sym.c @@ -116,14 +116,69 @@ RTLD_NEXT used in code not dynamically loaded")); if (ref != NULL) { + void *value; + #if defined USE_TLS && defined SHARED if (ELFW(ST_TYPE) (ref->st_info) == STT_TLS) /* The found symbol is a thread-local storage variable. Return the address for to the current thread. */ - return _dl_tls_symaddr (result, ref); + value = _dl_tls_symaddr (result, ref); + else +#endif + value = DL_SYMBOL_ADDRESS (result, ref); + +#ifdef SHARED + /* Auditing checkpoint: we have a new binding. Provide the + auditing libraries the possibility to change the value and + tell us whether further auditing is wanted. */ + if (__builtin_expect (GLRO(dl_naudit) > 0, 0)) + { + const char *strtab = (const char *) D_PTR (result, + l_info[DT_STRTAB]); + /* Compute index of the symbol entry in the symbol table of + the DSO with the definition. */ + unsigned int ndx = (ref - (ElfW(Sym) *) D_PTR (result, + l_info[DT_SYMTAB])); + + if ((match->l_audit_any_plt | result->l_audit_any_plt) != 0) + { + unsigned int altvalue = 0; + struct audit_ifaces *afct = GLRO(dl_audit); + /* Synthesize a symbol record where the st_value field is + the result. */ + ElfW(Sym) sym = *ref; + sym.st_value = (ElfW(Addr)) value; + + for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt) + { + if (afct->symbind != NULL + && ((match->l_audit[cnt].bindflags & LA_FLG_BINDFROM) + != 0 + || ((result->l_audit[cnt].bindflags & LA_FLG_BINDTO) + != 0))) + { + unsigned int flags = altvalue | LA_SYMB_DLSYM; + uintptr_t new_value + = afct->symbind (&sym, ndx, + &match->l_audit[cnt].cookie, + &result->l_audit[cnt].cookie, + &flags, strtab + ref->st_name); + if (new_value != (uintptr_t) sym.st_value) + { + altvalue = LA_SYMB_ALTVALUE; + sym.st_value = new_value; + } + } + + afct = afct->next; + } + + value = (void *) sym.st_value; + } + } #endif - return DL_SYMBOL_ADDRESS (result, ref); + return value; } return NULL; |