Hide internal sysinfo functions [BZ #18822]

Hide internal sysinfo functions to allow direct access within libc.so
and libc.a without using GOT nor PLT.

	[BZ #18822]
	* include/sys/sysinfo.h (__get_nprocs_conf): Add
	libc_hidden_proto.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	(__get_child_max): Add attribute_hidden.
	* misc/getsysstats.c (__get_nprocs_conf): Add libc_hidden_def.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	* sysdeps/mach/getsysstats.c (__get_nprocs_conf): Add
	libc_hidden_def.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Add
	libc_hidden_def.
	(__get_nprocs_conf): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.

5 files changed, 41 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 8117cc1b6a..4851dc7c12 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,30 @@
 2017-10-01  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #18822]
+	* include/sys/sysinfo.h (__get_nprocs_conf): Add
+	libc_hidden_proto.
+	(__get_nprocs): Likewise.
+	(__get_phys_pages): Likewise.
+	(__get_avphys_pages): Likewise.
+	(__get_child_max): Add attribute_hidden.
+	* misc/getsysstats.c (__get_nprocs_conf): Add libc_hidden_def.
+	(__get_nprocs): Likewise.
+	(__get_phys_pages): Likewise.
+	(__get_avphys_pages): Likewise.
+	* sysdeps/mach/getsysstats.c (__get_nprocs_conf): Add
+	libc_hidden_def.
+	(__get_nprocs): Likewise.
+	(__get_phys_pages): Likewise.
+	(__get_avphys_pages): Likewise.
+	* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Add
+	libc_hidden_def.
+	(__get_nprocs_conf): Likewise.
+	(__get_phys_pages): Likewise.
+	(__get_avphys_pages): Likewise.
+
+2017-10-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #18822]
 	* sysdeps/unix/sysv/linux/netlinkaccess.h (__netlink_open): Add
 	attribute_hidden.
 	(__netlink_close): Likewise.
diff --git a/include/sys/sysinfo.h b/include/sys/sysinfo.h
index c33eae2883..7388356a19 100644
--- a/include/sys/sysinfo.h
+++ b/include/sys/sysinfo.h
@@ -7,18 +7,22 @@
 
 /* Return number of configured processors.  */
 extern int __get_nprocs_conf (void);
+libc_hidden_proto (__get_nprocs_conf)
 
 /* Return number of available processors.  */
 extern int __get_nprocs (void);
+libc_hidden_proto (__get_nprocs)
 
 /* Return number of physical pages of memory in the system.  */
 extern long int __get_phys_pages (void);
+libc_hidden_proto (__get_phys_pages)
 
 /* Return number of available physical pages of memory in the system.  */
 extern long int __get_avphys_pages (void);
+libc_hidden_proto (__get_avphys_pages)
 
 /* Return maximum number of processes this real user ID can have.  */
-extern long int __get_child_max (void);
+extern long int __get_child_max (void) attribute_hidden;
 
 # endif /* !_ISOMAC */
 #endif /* sys/sysinfo.h */
diff --git a/misc/getsysstats.c b/misc/getsysstats.c
index d25770ec52..cbad87a3a2 100644
--- a/misc/getsysstats.c
+++ b/misc/getsysstats.c
@@ -26,6 +26,7 @@ __get_nprocs_conf (void)
   /* We don't know how to determine the number.  Simply return always 1.  */
   return 1;
 }
+libc_hidden_def (__get_nprocs_conf)
 weak_alias (__get_nprocs_conf, get_nprocs_conf)
 
 link_warning (get_nprocs_conf, "warning: get_nprocs_conf will always return 1")
@@ -38,6 +39,7 @@ __get_nprocs (void)
   /* We don't know how to determine the number.  Simply return always 1.  */
   return 1;
 }
+libc_hidden_def (__get_nprocs)
 weak_alias (__get_nprocs, get_nprocs)
 
 link_warning (get_nprocs, "warning: get_nprocs will always return 1")
@@ -50,6 +52,7 @@ __get_phys_pages (void)
   __set_errno (ENOSYS);
   return -1;
 }
+libc_hidden_def (__get_phys_pages)
 weak_alias (__get_phys_pages, get_phys_pages)
 
 stub_warning (get_phys_pages)
@@ -62,6 +65,7 @@ __get_avphys_pages (void)
   __set_errno (ENOSYS);
   return -1;
 }
+libc_hidden_def (__get_avphys_pages)
 weak_alias (__get_avphys_pages, get_avphys_pages)
 
 stub_warning (get_avphys_pages)
diff --git a/sysdeps/mach/getsysstats.c b/sysdeps/mach/getsysstats.c
index 0dacab0300..3aabd61382 100644
--- a/sysdeps/mach/getsysstats.c
+++ b/sysdeps/mach/getsysstats.c
@@ -39,6 +39,7 @@ __get_nprocs_conf (void)
 
   return hbi.max_cpus;
 }
+libc_hidden_def (__get_nprocs_conf)
 weak_alias (__get_nprocs_conf, get_nprocs_conf)
 
 /* Return the number of processors currently available on the system. */
@@ -58,6 +59,7 @@ __get_nprocs (void)
 
   return hbi.avail_cpus;
 }
+libc_hidden_def (__get_nprocs)
 weak_alias (__get_nprocs, get_nprocs)
 
 /* Return the number of physical pages on the system. */
@@ -77,6 +79,7 @@ __get_phys_pages (void)
 
   return hbi.memory_size / __vm_page_size;
 }
+libc_hidden_def (__get_phys_pages)
 weak_alias (__get_phys_pages, get_phys_pages)
 
 /* Return the number of available physical pages */
@@ -102,4 +105,5 @@ __get_avphys_pages (void)
 
   return vs.free_count;
 }
+libc_hidden_def (__get_avphys_pages)
 weak_alias (__get_avphys_pages, get_avphys_pages)
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
index d02c86d739..c245b3c662 100644
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
@@ -226,6 +226,7 @@ __get_nprocs (void)
 
   return result;
 }
+libc_hidden_def (__get_nprocs)
 weak_alias (__get_nprocs, get_nprocs)
 
 
@@ -279,6 +280,7 @@ __get_nprocs_conf (void)
 
   return result;
 }
+libc_hidden_def (__get_nprocs_conf)
 weak_alias (__get_nprocs_conf, get_nprocs_conf)
 
 
@@ -320,6 +322,7 @@ __get_phys_pages (void)
   __sysinfo (&info);
   return sysinfo_mempages (info.totalram, info.mem_unit);
 }
+libc_hidden_def (__get_phys_pages)
 weak_alias (__get_phys_pages, get_phys_pages)
 
 long int
@@ -330,4 +333,5 @@ __get_avphys_pages (void)
   __sysinfo (&info);
   return sysinfo_mempages (info.freeram, info.mem_unit);
 }
+libc_hidden_def (__get_avphys_pages)
 weak_alias (__get_avphys_pages, get_avphys_pages)