diff options
Diffstat (limited to 'nss/nsswitch.c')
| -rw-r--r-- | nss/nsswitch.c | 73 |
1 files changed, 50 insertions, 23 deletions
diff --git a/nss/nsswitch.c b/nss/nsswitch.c index 5bcacf296d..f36fe9607d 100644 --- a/nss/nsswitch.c +++ b/nss/nsswitch.c @@ -241,13 +241,13 @@ __nss_configure_lookup (const char *dbname, const char *service_line) static int -nss_dlerror_run (void (*operate) (void)) +nss_dlerror_run (void (*operate) (void *), void *args) { char *last_errstring = NULL; const char *last_object_name = NULL; int result; - (void) _dl_catch_error (&last_errstring, &last_object_name, operate); + (void) _dl_catch_error (&last_errstring, &last_object_name, operate, args); result = last_errstring != NULL; if (result) @@ -257,6 +257,42 @@ nss_dlerror_run (void (*operate) (void)) } +struct do_open_args +{ + /* Argument to do_open. */ + char *shlib_name; + service_user *ni; +}; + +struct get_sym_args +{ + /* Arguments to get_sym. */ + struct link_map *map; + char *name; + + /* Return values of get_sym. */ + ElfW(Addr) loadbase; + const ElfW(Sym) *ref; +}; + +static void +do_open (void *a) +{ + struct do_open_args *args = (struct do_open_args *) a; + /* Open and relocate the shared object. */ + args->ni->library->lib_handle = _dl_open (args->shlib_name, RTLD_LAZY); +} + +static void +get_sym (void *a) +{ + struct get_sym_args *args = (struct get_sym_args *) a; + struct link_map *scope[2] = { args->map, NULL }; + args->ref = NULL; + args->loadbase = _dl_lookup_symbol (args->name, &args->ref, + scope, args->map->l_name, 0); +} + /* Comparison function for searching NI->known tree. */ static int known_compare (const void *p1, const void *p2) @@ -332,21 +368,19 @@ nss_lookup_function (service_user *ni, const char *fct_name) /* Load the shared library. */ size_t shlen = (7 + strlen (ni->library->name) + 3 + strlen (__nss_shlib_revision) + 1); - char shlib_name[shlen]; - void do_open (void) - { - /* Open and relocate the shared object. */ - ni->library->lib_handle = _dl_open (shlib_name, RTLD_LAZY); - } + struct do_open_args args; + args.shlib_name = __alloca (shlen); + args.ni = ni; /* Construct shared object name. */ - __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name, "libnss_"), + __stpcpy (__stpcpy (__stpcpy (__stpcpy (args.shlib_name, + "libnss_"), ni->library->name), ".so"), __nss_shlib_revision); - if (nss_dlerror_run (do_open) != 0) + if (nss_dlerror_run (do_open, &args) != 0) /* Failed to load the library. */ ni->library->lib_handle = (void *) -1l; } @@ -359,26 +393,19 @@ nss_lookup_function (service_user *ni, const char *fct_name) /* Get the desired function. Again, GNU ld.so magic ahead. */ size_t namlen = (5 + strlen (ni->library->name) + 1 + strlen (fct_name) + 1); - char name[namlen]; - struct link_map *map = ni->library->lib_handle; - ElfW(Addr) loadbase; - const ElfW(Sym) *ref = NULL; - void get_sym (void) - { - struct link_map *scope[2] = { map, NULL }; - loadbase = _dl_lookup_symbol (name, &ref, - scope, map->l_name, 0); - } + struct get_sym_args args; + args.name = __alloca (namlen); + args.map = ni->library->lib_handle; /* Construct the function name. */ - __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_"), + __stpcpy (__stpcpy (__stpcpy (__stpcpy (args.name, "_nss_"), ni->library->name), "_"), fct_name); /* Look up the symbol. */ - result = (nss_dlerror_run (get_sym) - ? NULL : (void *) (loadbase + ref->st_value)); + result = (nss_dlerror_run (get_sym, &args) ? NULL + : (void *) (args.loadbase + args.ref->st_value)); } /* Remember function pointer for later calls. Even if null, we |