rh62-06-glibc-2.1.3-preload.patch

linux下编译交叉工具链的工具源码

2001-01-08  Ulrich Drepper  <[e-mail]>

	* elf/rtld.c (process_envvars): Place output files for profiling
	in SUID binaries in /var/profile.

	* elf/dl-load.c (_dl_map_object): Don't look in cache for
	preloading in SUID binaries.

	* elf/dl-profile.c (_dl_start_profile): Open the output file with
	O_NOFOLLOW if possible.

	* sysdeps/generic/segfault.c (install_handler): Check output file
	name with access().

--- libc/elf/rtld.c	2000/03/15 05:42:01	1.148.2.7
+++ libc/elf/rtld.c	2001/01/10 07:45:19
@@ -1273,7 +1273,7 @@
   char *debug_output = NULL;
 
   /* This is the default place for profiling data file.  */
-  _dl_profile_output = "/var/tmp";
+  _dl_profile_output = __libc_enable_secure ? "/var/profile" : "/var/tmp";
 
   while ((envline = _dl_next_ld_env_entry (&runp)) != NULL)
     {
--- libc/elf/dl-load.c	1999/11/20 02:26:38	1.103.2.5
+++ libc/elf/dl-load.c	2001/01/10 07:45:20
@@ -1338,7 +1338,7 @@
       if (fd == -1 && env_path_list != NULL)
 	fd = open_path (name, namelen, preloaded, env_path_list, &realname);
 
-      if (fd == -1)
+      if (fd == -1 && (! preloaded || ! __libc_enable_secure))
 	{
 	  /* Check the list of libraries in the file /etc/ld.so.cache,
 	     for compatibility with Linux's ldconfig program.  */
--- libc/elf/dl-profile.c	1998/06/07 13:35:48	1.14
+++ libc/elf/dl-profile.c	2001/01/10 07:45:21
@@ -263,7 +263,12 @@
   *cp++ = '/';
   __stpcpy (__stpcpy (cp, _dl_profile), ".profile");
 
-  fd = __open (filename, O_RDWR | O_CREAT, 0666);
+#ifdef O_NOFOLLOW
+# define EXTRA_FLAGS | O_NOFOLLOW
+#else
+# define EXTRA_FLAGS
+#endif
+  fd = __open (filename, O_RDWR | O_CREAT EXTRA_FLAGS, 0666);
   if (fd == -1)
     {
       /* We cannot write the profiling data so don't do anything.  */
--- libc/sysdeps/generic/segfault.c	2000/03/21 04:53:40	1.10.2.2
+++ libc/sysdeps/generic/segfault.c	2001/01/10 07:45:22
@@ -236,6 +236,7 @@
 
   /* Preserve the output file name if there is any given.  */
   name = getenv ("SEGFAULT_OUTPUT_NAME");
-  if (name != NULL && name[0] != '\0')
+  if (name != NULL && name[0] != '\0'
+      && (!__libc_enable_secure || access (name, R_OK | W_OK) == 0))
     fname = __strdup (name);
 }

--- libc/sysdeps/unix/sysv/linux/i386/dl-librecon.h.jj	Wed Feb 24 23:01:58 1999
+++ libc/sysdeps/unix/sysv/linux/i386/dl-librecon.h	Mon Jan 15 04:30:57 2001
@@ -49,13 +49,17 @@
 /* Recognizing extra environment variables.  */
 #define EXTRA_LD_ENVVARS \
   case 15:								      \
-    if (memcmp (&envline[3], "LIBRARY_VERSION", 15) == 0)		      \
+    if (!__libc_enable_secure						      \
+	&& memcmp (&envline[3], "LIBRARY_VERSION", 15) == 0)		      \
       {									      \
 	_dl_correct_cache_id = envline[19] == '5' ? 2 : 3;		      \
 	break;								      \
       }
 
 /* Extra unsecure variables.  */
-#define EXTRA_UNSECURE_ENVVARS "LD_AOUT_LIBRARY_PATH", "LD_AOUT_PRELOAD"
+#define EXTRA_UNSECURE_ENVVARS	\
+  "LD_AOUT_LIBRARY_PATH",	\
+  "LD_AOUT_PRELOAD",		\
+  "LD_LIBRARY_VERSION"
 
 #endif /* dl-librecon.h */