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authorUlrich Drepper <drepper@redhat.com>2004-02-21 01:06:02 +0000
committerUlrich Drepper <drepper@redhat.com>2004-02-21 01:06:02 +0000
commita461b14777bc56a19d3252d7fa5b47ee598757a0 (patch)
treecd4ec84558ed8db4b6a0af36d57f56328ee686ce /dlfcn/dlsym.c
parent5990e1fe120708a10ae8ab0caf4a284b5d6b10f8 (diff)
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Update.
2004-02-20  Ulrich Drepper  <drepper@redhat.com>

	* dlfcn/dlsym.c: Get ld.so loading lock before the call into ld.so.
	* dlfcn/dlvsym.c: Likewise.
	* elf/dl-addr.c: Get loading lock while using _dl_loaded data.
	* elf/dl-fini.c: Likewise.
	Patch by Shunichi Sagawa <s-sagawa@jp.fujitsu.com>.
Diffstat (limited to 'dlfcn/dlsym.c')
-rw-r--r--dlfcn/dlsym.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/dlfcn/dlsym.c b/dlfcn/dlsym.c
index ec071d9de8..76dda5973f 100644
--- a/dlfcn/dlsym.c
+++ b/dlfcn/dlsym.c
@@ -1,5 +1,5 @@
 /* Look up a symbol in a shared object loaded by `dlopen'.
-   Copyright (C) 1995, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1995-2000, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,6 +20,8 @@
 #include <dlfcn.h>
 #include <stddef.h>
 
+#include <ldsodefs.h>
+
 struct dlsym_args
 {
   /* The arguments to dlsym_doit.  */
@@ -48,5 +50,12 @@ dlsym (void *handle, const char *name)
   args.handle = handle;
   args.name = name;
 
-  return (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym);
+  /* Protect against concurrent loads and unloads.  */
+  __rtld_lock_lock_recursive (GL(dl_load_lock));
+
+  void *result = (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym);
+
+  __rtld_lock_unlock_recursive (GL(dl_load_lock));
+
+  return result;
 }