diff mbox

[49/58] Hide internal __nis_hash function [BZ #18822]

Message ID 20170901180029.9527-50-hjl.tools@gmail.com
State Committed
Commit 36e7ae1e9d3b6a434e119aab4d10176aaaddf0c3
Headers

Commit Message

H.J. Lu Sept. 1, 2017, 6 p.m. UTC 
  Hide internal __nis_hash function to allow direct access within libc.so
and libc.a without using GOT nor PLT.

	[BZ #18822]
	* nscd/nscd_helper.c (__nis_hash): New prototype.
---
 nscd/nscd_helper.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

H.J. Lu Oct. 2, 2017, 12:49 a.m. UTC | #1 
On 9/1/17, H.J. Lu <hjl.tools@gmail.com> wrote:
> Hide internal __nis_hash function to allow direct access within libc.so
> and libc.a without using GOT nor PLT.
>
> 	[BZ #18822]
> 	* nscd/nscd_helper.c (__nis_hash): New prototype.

Tested with build-many-glibcs.py.  I am checking it in.

H.J.
diff mbox

Patch

diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c
index a225623f92..56e6d1421f 100644
--- a/nscd/nscd_helper.c
+++ b/nscd/nscd_helper.c
@@ -443,6 +443,11 @@  __nscd_get_map_ref (request_type type, const char *name,
 #define MINIMUM_HASHENTRY_SIZE \
   (offsetof (struct hashentry, dellist) + sizeof (int32_t))
 
+/* __nis_hash is defined in nis_hash.c which is included both libnsl
+   and libc.  Since the one in libnsl is exported and the one in libc
+   is hidden, __nis_hash is marked as hidden where it is referenced,
+   not where it is defined.  */
+extern __typeof (__nis_hash) __nis_hash attribute_hidden;
 
 /* Don't return const struct datahead *, as eventhough the record
    is normally constant, it can change arbitrarily during nscd