svn commit: r311202 - stable/11/libexec/rtld-elf

[Bryan Drewery]

Author: bdrewery
Date: Tue Jan  3 23:28:07 2017
New Revision: 311202
URL: https://svnweb.freebsd.org/changeset/base/311202

Log:
  MFC r310025:
  
    Take write lock for rtld_bind before modifying obj_list in dl_iterate_phdr().

Modified:
  stable/11/libexec/rtld-elf/rtld.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/libexec/rtld-elf/rtld.c
==============================================================================
--- stable/11/libexec/rtld-elf/rtld.c	Tue Jan  3 23:25:55 2017	(r311201)
+++ stable/11/libexec/rtld-elf/rtld.c	Tue Jan  3 23:28:07 2017	(r311202)
@@ -3545,7 +3545,7 @@ dl_iterate_phdr(__dl_iterate_hdr_callbac
 	error = 0;
 
 	wlock_acquire(rtld_phdr_lock, &phdr_lockstate);
-	rlock_acquire(rtld_bind_lock, &bind_lockstate);
+	wlock_acquire(rtld_bind_lock, &bind_lockstate);
 	for (obj = globallist_curr(TAILQ_FIRST(&obj_list)); obj != NULL;) {
 		TAILQ_INSERT_AFTER(&obj_list, obj, &marker, next);
 		rtld_fill_dl_phdr_info(obj, &phdr_info);
@@ -3553,7 +3553,7 @@ dl_iterate_phdr(__dl_iterate_hdr_callbac
 
 		error = callback(&phdr_info, sizeof phdr_info, param);
 
-		rlock_acquire(rtld_bind_lock, &bind_lockstate);
+		wlock_acquire(rtld_bind_lock, &bind_lockstate);
 		obj = globallist_next(&marker);
 		TAILQ_REMOVE(&obj_list, &marker, next);
 		if (error != 0) {