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nss: Turn __nss_database_lookup into a compatibility symbol

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The function uses the internal service_user type, so it is not
really usable from the outside of glibc.  Rename the function
to __nss_database_lookup2 for internal use, and change
__nss_database_lookup to always indicate failure to the caller.

__nss_next already was a compatibility symbol.  The new
implementation always fails and no longer calls __nss_next2.

unscd, the alternative nscd implementation, does not use
__nss_database_lookup, so it is not affected by this change.
This commit is contained in:
Florian Weimer 2019-05-15 13:51:35 +02:00
parent d50f09181e
commit a9368c34d7
15 changed files with 89 additions and 42 deletions
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27
ChangeLog
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@ -1,3 +1,30 @@
2019-05-15 Florian Weimer <fweimer@redhat.com>
nss: Turn __nss_database_lookup into a compatibility symbol.
* nss/nsswitch.h (__nss_database_lookup2): Renamed from
__nss_database_lookup.
* nss/nsswitch.c (__nss_database_lookup2): Likewise.
(nss_load_all_libraries): Call __nss_database_lookup2 instead of
__nss_database_lookup.
(__nss_next): Move to …
* nss/compat-lookup.c (nss_next): … here. Change it to fail
unconditionally.
(__nss_database_lookup): New function.
* nss/Versions (GLIBC_2.0): Update comment.
(GLIBC_PRIVATE): Export __nss_database_lookup2.
* grp/initgroups.c (internal_getgrouplist): Call
__nss_database_lookup2 instead of __nss_database_lookup.
* nscd/aicache.c (addhstaiX): Likewise.
* nscd/initgrcache.c (addinitgroupsX): Likewise.
* nscd/netgroupcache.c (addgetnetgrentX): Likewise.
* nss/XXX-lookup.c (DB_LOOKUP_FCT): Likewise.
* nss/nss_compat/compat-grp.c (init_nss_interface): Likewise.
* nss/nss_compat/compat-initgroups.c (init_nss_interface):
Likewise.
* nss/nss_compat/compat-pwd.c (init_nss_interface): Likewise.
* nss/nss_compat/compat-spwd.c (init_nss_interface): Likewise.
* sysdeps/posix/getaddrinfo.c (gaih_inet): Likewise.
2019-05-15 Alexandra Hajkova <ahajkova@redhat.com>
* support/support.h (support_install_rootsbindir): New variable.
* support/support_paths.c: Likewise.

4
grp/initgroups.c
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@ -79,11 +79,11 @@ internal_getgrouplist (const char *user, gid_t group, long int *size,
if (__nss_initgroups_database == NULL)
{
if (__nss_database_lookup ("initgroups", NULL, "",
if (__nss_database_lookup2 ("initgroups", NULL, "",
&__nss_initgroups_database) < 0)
{
if (__nss_group_database == NULL)
no_more = __nss_database_lookup ("group", NULL, DEFAULT_CONFIG,
no_more = __nss_database_lookup2 ("group", NULL, DEFAULT_CONFIG,
&__nss_group_database);
__nss_initgroups_database = __nss_group_database;

2
nscd/aicache.c
View File

@ -92,7 +92,7 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req,
int herrno = 0;
if (hosts_database == NULL)
no_more = __nss_database_lookup ("hosts", NULL,
no_more = __nss_database_lookup2 ("hosts", NULL,
"dns [!UNAVAIL=return] files",
&hosts_database);
else

2
nscd/initgrcache.c
View File

@ -88,7 +88,7 @@ addinitgroupsX (struct database_dyn *db, int fd, request_header *req,
int no_more;
if (group_database == NULL)
no_more = __nss_database_lookup ("group", NULL, DEFAULT_CONFIG,
no_more = __nss_database_lookup2 ("group", NULL, DEFAULT_CONFIG,
&group_database);
else
no_more = 0;

2
nscd/netgroupcache.c
View File

@ -143,7 +143,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
*tofreep = NULL;
if (netgroup_database == NULL
&& __nss_database_lookup ("netgroup", NULL, NULL, &netgroup_database))
&& __nss_database_lookup2 ("netgroup", NULL, NULL, &netgroup_database))
{
/* No such service. */
cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,

8
nss/Versions
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@ -1,8 +1,10 @@
libc {
GLIBC_2.0 {
# functions used in other libraries
__nss_configure_lookup;
# Functions exported as no-op compat symbols.
__nss_passwd_lookup; __nss_group_lookup; __nss_hosts_lookup; __nss_next;
__nss_database_lookup; __nss_configure_lookup;
__nss_database_lookup;
}
GLIBC_2.2.2 {
__nss_hostname_digits_dots;
@ -15,7 +17,7 @@ libc {
__nss_passwd_lookup2; __nss_group_lookup2; __nss_hosts_lookup2;
__nss_services_lookup2; __nss_next2; __nss_lookup;
__nss_hash;
__nss_hash; __nss_database_lookup2;
}
}

2
nss/XXX-lookup.c
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@ -57,7 +57,7 @@ DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
void **fctp)
{
if (DATABASE_NAME_SYMBOL == NULL
&& __nss_database_lookup (DATABASE_NAME_STRING, ALTERNATE_NAME_STRING,
&& __nss_database_lookup2 (DATABASE_NAME_STRING, ALTERNATE_NAME_STRING,
DEFAULT_CONFIG, &DATABASE_NAME_SYMBOL) < 0)
return -1;

30
nss/compat-lookup.c
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@ -16,11 +16,12 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <nsswitch.h>
#include <shlib-compat.h>
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_27)
# include <errno.h>
# include <nsswitch.h>
/* On i386, the function calling convention changed from the standard
ABI calling convention to three register parameters in glibc 2.8.
@ -40,3 +41,30 @@ strong_alias (__nss_passwd_lookup, __nss_hosts_lookup)
compat_symbol (libc, __nss_hosts_lookup, __nss_hosts_lookup, GLIBC_2_0);
#endif /* SHLIB_COMPAT */
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_30)
/* These functions were exported under a non-GLIBC_PRIVATE version,
even though it is not usable externally due to the service_user
type dependency. */
int
attribute_compat_text_section
__nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
int all_values)
{
return -1;
}
compat_symbol (libc, __nss_next, __nss_next, GLIBC_2_0);
int
attribute_compat_text_section
__nss_database_lookup (const char *database, const char *alternate_name,
const char *defconfig, service_user **ni)
{
*ni = NULL;
return -1;
}
compat_symbol (libc, __nss_database_lookup, __nss_database_lookup, GLIBC_2_0);
#endif /* SHLIB_COMPAT */

2
nss/nss_compat/compat-grp.c
View File

@ -78,7 +78,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup ("group_compat", NULL, "nis", &ni) >= 0)
if (__nss_database_lookup2 ("group_compat", NULL, "nis", &ni) >= 0)
{
nss_setgrent = __nss_lookup_function (ni, "setgrent");
nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r");

2
nss/nss_compat/compat-initgroups.c
View File

@ -89,7 +89,7 @@ init_nss_interface (void)
/* Retest. */
if (ni == NULL
&& __nss_database_lookup ("group_compat", NULL, "nis", &ni) >= 0)
&& __nss_database_lookup2 ("group_compat", NULL, "nis", &ni) >= 0)
{
nss_initgroups_dyn = __nss_lookup_function (ni, "initgroups_dyn");
nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r");

2
nss/nss_compat/compat-pwd.c
View File

@ -88,7 +88,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup ("passwd_compat", NULL, "nis", &ni) >= 0)
if (__nss_database_lookup2 ("passwd_compat", NULL, "nis", &ni) >= 0)
{
nss_setpwent = __nss_lookup_function (ni, "setpwent");
nss_getpwnam_r = __nss_lookup_function (ni, "getpwnam_r");

2
nss/nss_compat/compat-spwd.c
View File

@ -85,7 +85,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup ("shadow_compat", "passwd_compat",
if (__nss_database_lookup2 ("shadow_compat", "passwd_compat",
"nis", &ni) >= 0)
{
nss_setspent = __nss_lookup_function (ni, "setspent");

16
nss/nsswitch.c
View File

@ -115,7 +115,7 @@ static void (*nscd_init_cb) (size_t, struct traced_file *);
/* -1 == database not found
0 == database entry pointer stored */
int
__nss_database_lookup (const char *database, const char *alternate_name,
__nss_database_lookup2 (const char *database, const char *alternate_name,
const char *defconfig, service_user **ni)
{
/* Prevent multiple threads to change the service table. */
@ -185,7 +185,7 @@ __nss_database_lookup (const char *database, const char *alternate_name,
return *ni != NULL ? 0 : -1;
}
libc_hidden_def (__nss_database_lookup)
libc_hidden_def (__nss_database_lookup2)
/* -1 == not found
@ -260,16 +260,6 @@ __nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name,
}
libc_hidden_def (__nss_next2)
int
attribute_compat_text_section
__nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
int all_values)
{
return __nss_next2 (ni, fct_name, NULL, fctp, status, all_values);
}
int
__nss_configure_lookup (const char *dbname, const char *service_line)
{
@ -835,7 +825,7 @@ nss_load_all_libraries (const char *service, const char *def)
{
service_user *ni = NULL;
if (__nss_database_lookup (service, NULL, def, &ni) == 0)
if (__nss_database_lookup2 (service, NULL, def, &ni) == 0)
while (ni != NULL)
{
nss_load_library (ni);

4
nss/nsswitch.h
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@ -125,10 +125,10 @@ extern bool __nss_database_custom[NSS_DBSIDX_max] attribute_hidden;
If there is no configuration for this database in the file,
parse a service list from DEFCONFIG and use that. More
than one function can use the database. */
extern int __nss_database_lookup (const char *database,
extern int __nss_database_lookup2 (const char *database,
const char *alternative_name,
const char *defconfig, service_user **ni);
libc_hidden_proto (__nss_database_lookup)
libc_hidden_proto (__nss_database_lookup2)
/* Put first function with name FCT_NAME for SERVICE in FCTP. The
position is remembered in NI. The function returns a value < 0 if

2
sysdeps/posix/getaddrinfo.c
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@ -732,7 +732,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
#endif
if (__nss_hosts_database == NULL)
no_more = __nss_database_lookup ("hosts", NULL,
no_more = __nss_database_lookup2 ("hosts", NULL,
"dns [!UNAVAIL=return] files",
&__nss_hosts_database);
else