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authorH.J. Lu <hjl.tools@gmail.com>2017-08-21 05:31:02 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-08-21 05:31:19 -0700
commit1dbbb1ec7af9026bbdc6dd265525de0c3958406c (patch)
tree21aa5ee4232f9e0c8a0f45f7b8476711fce828e7
parent2585d7b839559e665d5723734862fbe62264b25d (diff)
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Mark internal nss symbols with attribute_hidden [BZ #18822]
Mark internal nss symbols with attribute_hidden to allow direct access within libc.so and libc.a without using GOT nor PLT. Tested on x86-64 with and without --disable-nscd. [BZ #18822] * grp/initgroups.c (__nss_group_database): Removed. (__nss_initgroups_database): Likewise. * nscd/gai.c (__nss_hosts_database): Likewise. * nss/XXX-lookup.c (DATABASE_NAME_SYMBOL): Likewise. * posix/tst-rfc3484-2.c (__nss_hosts_database): Likewise. * posix/tst-rfc3484-3.c (__nss_hosts_database): Likewise. * posix/tst-rfc3484.c (__nss_hosts_database): Likewise. * sysdeps/posix/getaddrinfo.c (__nss_hosts_database): Likewise. * nss/getXXent.c (INTERNAL (REENTRANT_GETNAME)): Add attribute_hidden. * nss/nsswitch.c (__nss_database_custom): Define only if USE_NSCD is defined. (__nss_configure_lookup): Use __nss_database_custom only if USE_NSCD is defined. * nss/nsswitch.h (__nss_database_custom): Declare only if USE_NSCD is defined. Add attribute_hidden. (__nss_setent): Add attribute_hidden. (__nss_endent): Likewise. (__nss_getent_r): Likewise. (__nss_getent): Likewise. (DEFINE_DATABASE): Declare __nss_##arg##_database.
-rw-r--r--ChangeLog25
-rw-r--r--grp/initgroups.c2
-rw-r--r--nscd/gai.c3
-rw-r--r--nss/XXX-lookup.c2
-rw-r--r--nss/getXXent.c2
-rw-r--r--nss/nsswitch.c4
-rw-r--r--nss/nsswitch.h23
-rw-r--r--posix/tst-rfc3484-2.c2
-rw-r--r--posix/tst-rfc3484-3.c2
-rw-r--r--posix/tst-rfc3484.c2
-rw-r--r--sysdeps/posix/getaddrinfo.c1
11 files changed, 45 insertions, 23 deletions
diff --git a/ChangeLog b/ChangeLog
index 170d3ac928..680f377986 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,28 @@
+2017-08-21 H.J. Lu <hongjiu.lu@intel.com>
+
+ [BZ #18822]
+ * grp/initgroups.c (__nss_group_database): Removed.
+ (__nss_initgroups_database): Likewise.
+ * nscd/gai.c (__nss_hosts_database): Likewise.
+ * nss/XXX-lookup.c (DATABASE_NAME_SYMBOL): Likewise.
+ * posix/tst-rfc3484-2.c (__nss_hosts_database): Likewise.
+ * posix/tst-rfc3484-3.c (__nss_hosts_database): Likewise.
+ * posix/tst-rfc3484.c (__nss_hosts_database): Likewise.
+ * sysdeps/posix/getaddrinfo.c (__nss_hosts_database): Likewise.
+ * nss/getXXent.c (INTERNAL (REENTRANT_GETNAME)): Add
+ attribute_hidden.
+ * nss/nsswitch.c (__nss_database_custom): Define only if
+ USE_NSCD is defined.
+ (__nss_configure_lookup): Use __nss_database_custom only if
+ USE_NSCD is defined.
+ * nss/nsswitch.h (__nss_database_custom): Declare only if
+ USE_NSCD is defined. Add attribute_hidden.
+ (__nss_setent): Add attribute_hidden.
+ (__nss_endent): Likewise.
+ (__nss_getent_r): Likewise.
+ (__nss_getent): Likewise.
+ (DEFINE_DATABASE): Declare __nss_##arg##_database.
+
2017-08-20 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
diff --git a/grp/initgroups.c b/grp/initgroups.c
index 0d5b841796..3e4a3de11f 100644
--- a/grp/initgroups.c
+++ b/grp/initgroups.c
@@ -36,8 +36,6 @@ typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
long int *, long int *,
gid_t **, long int, int *);
-extern service_user *__nss_group_database attribute_hidden;
-service_user *__nss_initgroups_database;
static bool use_initgroups_entry;
diff --git a/nscd/gai.c b/nscd/gai.c
index a1aeadadc3..084a1fe68a 100644
--- a/nscd/gai.c
+++ b/nscd/gai.c
@@ -43,6 +43,3 @@
#ifdef HAVE_LIBIDN
# include <libidn/idn-stub.c>
#endif
-
-/* Some variables normally defined in libc. */
-service_user *__nss_hosts_database;
diff --git a/nss/XXX-lookup.c b/nss/XXX-lookup.c
index 49417691b2..839c96e194 100644
--- a/nss/XXX-lookup.c
+++ b/nss/XXX-lookup.c
@@ -52,8 +52,6 @@
#define DEFAULT_CONFIG NULL
#endif
-service_user *DATABASE_NAME_SYMBOL attribute_hidden;
-
int
DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
void **fctp)
diff --git a/nss/getXXent.c b/nss/getXXent.c
index aad374197f..31bd24b924 100644
--- a/nss/getXXent.c
+++ b/nss/getXXent.c
@@ -56,7 +56,7 @@
/* Prototype of the reentrant version. */
extern int INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer,
size_t buflen, LOOKUP_TYPE **result
- H_ERRNO_PARM);
+ H_ERRNO_PARM) attribute_hidden;
/* We need to protect the dynamic buffer handling. */
__libc_lock_define_initialized (static, lock);
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index 8f31658523..834bef6f9c 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -73,8 +73,10 @@ static const struct
};
#define ndatabases (sizeof (databases) / sizeof (databases[0]))
+#ifdef USE_NSCD
/* Flags whether custom rules for database is set. */
bool __nss_database_custom[NSS_DBSIDX_max];
+#endif
__libc_lock_define_initialized (static, lock)
@@ -304,7 +306,9 @@ __nss_configure_lookup (const char *dbname, const char *service_line)
/* Install new rules. */
*databases[cnt].dbp = new_db;
+#ifdef USE_NSCD
__nss_database_custom[cnt] = true;
+#endif
__libc_lock_unlock (lock);
diff --git a/nss/nsswitch.h b/nss/nsswitch.h
index 2b86d63ddb..ab0a512d40 100644
--- a/nss/nsswitch.h
+++ b/nss/nsswitch.h
@@ -96,17 +96,19 @@ typedef struct name_database
} name_database;
+#ifdef USE_NSCD
/* Indices into DATABASES in nsswitch.c and __NSS_DATABASE_CUSTOM. */
enum
{
-#define DEFINE_DATABASE(arg) NSS_DBSIDX_##arg,
-#include "databases.def"
-#undef DEFINE_DATABASE
+# define DEFINE_DATABASE(arg) NSS_DBSIDX_##arg,
+# include "databases.def"
+# undef DEFINE_DATABASE
NSS_DBSIDX_max
};
/* Flags whether custom rules for database is set. */
-extern bool __nss_database_custom[NSS_DBSIDX_max];
+extern bool __nss_database_custom[NSS_DBSIDX_max] attribute_hidden;
+#endif
/* Warning for NSS functions, which don't require dlopen if glibc
was built with --enable-static-nss. */
@@ -180,11 +182,13 @@ extern void __nss_setent (const char *func_name,
db_lookup_function lookup_fct,
service_user **nip, service_user **startp,
service_user **last_nip, int stayon,
- int *stayon_tmp, int res);
+ int *stayon_tmp, int res)
+ attribute_hidden;
extern void __nss_endent (const char *func_name,
db_lookup_function lookup_fct,
service_user **nip, service_user **startp,
- service_user **last_nip, int res);
+ service_user **last_nip, int res)
+ attribute_hidden;
extern int __nss_getent_r (const char *getent_func_name,
const char *setent_func_name,
db_lookup_function lookup_fct,
@@ -192,10 +196,12 @@ extern int __nss_getent_r (const char *getent_func_name,
service_user **last_nip, int *stayon_tmp,
int res,
void *resbuf, char *buffer, size_t buflen,
- void **result, int *h_errnop);
+ void **result, int *h_errnop)
+ attribute_hidden;
extern void *__nss_getent (getent_r_function func,
void **resbuf, char **buffer, size_t buflen,
- size_t *buffer_size, int *h_errnop);
+ size_t *buffer_size, int *h_errnop)
+ attribute_hidden;
struct resolv_context;
struct hostent;
extern int __nss_hostname_digits_dots_context (struct resolv_context *,
@@ -221,6 +227,7 @@ libc_hidden_proto (__nss_hostname_digits_dots)
/* Prototypes for __nss_*_lookup2 functions. */
#define DEFINE_DATABASE(arg) \
+ service_user *__nss_##arg##_database attribute_hidden; \
int __nss_##arg##_lookup2 (service_user **, const char *, \
const char *, void **); \
libc_hidden_proto (__nss_##arg##_lookup2)
diff --git a/posix/tst-rfc3484-2.c b/posix/tst-rfc3484-2.c
index ee9281394b..f509534ca9 100644
--- a/posix/tst-rfc3484-2.c
+++ b/posix/tst-rfc3484-2.c
@@ -58,8 +58,6 @@ _res_hconf_init (void)
#undef USE_NSCD
#include "../sysdeps/posix/getaddrinfo.c"
-service_user *__nss_hosts_database attribute_hidden;
-
/* This is the beginning of the real test code. The above defines
(among other things) the function rfc3484_sort. */
diff --git a/posix/tst-rfc3484-3.c b/posix/tst-rfc3484-3.c
index c987366e4e..ae44087a10 100644
--- a/posix/tst-rfc3484-3.c
+++ b/posix/tst-rfc3484-3.c
@@ -58,8 +58,6 @@ _res_hconf_init (void)
#undef USE_NSCD
#include "../sysdeps/posix/getaddrinfo.c"
-service_user *__nss_hosts_database attribute_hidden;
-
/* This is the beginning of the real test code. The above defines
(among other things) the function rfc3484_sort. */
diff --git a/posix/tst-rfc3484.c b/posix/tst-rfc3484.c
index 73c4dffcf5..7f191abbbc 100644
--- a/posix/tst-rfc3484.c
+++ b/posix/tst-rfc3484.c
@@ -58,8 +58,6 @@ _res_hconf_init (void)
#undef USE_NSCD
#include "../sysdeps/posix/getaddrinfo.c"
-service_user *__nss_hosts_database attribute_hidden;
-
/* This is the beginning of the real test code. The above defines
(among other things) the function rfc3484_sort. */
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index f02bbbe533..fcc5d79362 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -318,7 +318,6 @@ typedef enum nss_status (*nss_gethostbyname3_r)
typedef enum nss_status (*nss_getcanonname_r)
(const char *name, char *buffer, size_t buflen, char **result,
int *errnop, int *h_errnop);
-extern service_user *__nss_hosts_database attribute_hidden;
/* This function is called if a canonical name is requested, but if
the service function did not provide it. It tries to obtain the