* elf/dl-error.c (_dl_signal_error): Store information about use of

real malloc in the catch object.
	(_dl_catch_error): Forward information about malloc use to caller
	in new parameter.
	(_dl_out_of_memory): Make static.
	* elf/dl-deps.c: Adjust callers of _dl_catch_error.
	* elf/dl-libc.c: Likewise.
	* elf/dl-open.c: Likewise.
	* elf/rtld.c: Likewise.
	Add new --audit option.
	* sysdeps/generic/ldsodefs.h: Remove _dl_out_of_memory declaration.
	(rtld_global_ro._dl_signal_error): Add new parameter.
	* include/dlfcn.h (_dl_catch_error): Add new parameter.
	* dlfcn/dlfcn.c (_dlerror_run): Pass additional parameter to
	_dl_catch_error.  Only free if the returned newly value says so.

ChangeLog

@@ -1,3 +1,21 @@
+2005-06-12  Ulrich Drepper  <drepper@redhat.com>
+
+	* elf/dl-error.c (_dl_signal_error): Store information about use of
+	real malloc in the catch object.
+	(_dl_catch_error): Forward information about malloc use to caller
+	in new parameter.
+	(_dl_out_of_memory): Make static.
+	* elf/dl-deps.c: Adjust callers of _dl_catch_error.
+	* elf/dl-libc.c: Likewise.
+	* elf/dl-open.c: Likewise.
+	* elf/rtld.c: Likewise.
+	Add new --audit option.
+	* sysdeps/generic/ldsodefs.h: Remove _dl_out_of_memory declaration.
+	(rtld_global_ro._dl_signal_error): Add new parameter.
+	* include/dlfcn.h (_dl_catch_error): Add new parameter.
+	* dlfcn/dlfcn.c (_dlerror_run): Pass additional parameter to
+	_dl_catch_error.  Only free if the returned newly value says so.
+
 2005-06-01  Roland McGrath  <roland@redhat.com>
 
 	[BZ #959]

dlfcn/dlerror.c

@@ -19,6 +19,7 @@
 
 #include <dlfcn.h>
 #include <libintl.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -40,6 +41,7 @@ struct dl_action_result
   {
     int errcode;
     int returned;
+    bool malloced;
     const char *objname;
     const char *errstring;
   };
@@ -154,13 +156,13 @@ _dlerror_run (void (*operate) (void *), void *args)
     {
       /* Free the error string from the last failed command.  This can
 	 happen if `dlerror' was not run after an error was found.  */
-      if (strcmp (result->errstring, "out of memory") != 0)
+      if (result->malloced)
 	free ((char *) result->errstring);
       result->errstring = NULL;
     }
 
   result->errcode = GLRO(dl_catch_error) (&result->objname, &result->errstring,
-					  operate, args);
+					  &result->malloced, operate, args);
 
   /* If no error we mark that no error string is available.  */
   result->returned = result->errstring == NULL;

elf/dl-deps.c

@@ -235,16 +235,22 @@ _dl_map_object_deps (struct link_map *map,
 	      {
 		/* Map in the needed object.  */
 		struct link_map *dep;
-		int err;
 
 		/* Recognize DSTs.  */
 		name = expand_dst (l, strtab + d->d_un.d_val, 0);
 		/* Store the tag in the argument structure.  */
 		args.name = name;
 
-		err = _dl_catch_error (&objname, &errstring, openaux, &args);
+		bool malloced;
+		int err = _dl_catch_error (&objname, &errstring, &malloced,
+					   openaux, &args);
 		if (__builtin_expect (errstring != NULL, 0))
 		  {
+		    char *new_errstring = strdupa (errstring);
+		    if (malloced)
+		      free ((char *) errstring);
+		    errstring = new_errstring;
+
 		    if (err)
 		      errno_reason = err;
 		    else
@@ -288,8 +294,6 @@ _dl_map_object_deps (struct link_map *map,
 
 		if (d->d_tag == DT_AUXILIARY)
 		  {
-		    int err;
-
 		    /* Say that we are about to load an auxiliary library.  */
 		    if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS,
 					  0))
@@ -301,13 +305,14 @@ _dl_map_object_deps (struct link_map *map,
 
 		    /* We must be prepared that the addressed shared
 		       object is not available.  */
-		    err = _dl_catch_error (&objname, &errstring, openaux,
+		    bool malloced;
-					   &args);
+		    (void) _dl_catch_error (&objname, &errstring, &malloced,
+					    openaux, &args);
 		    if (__builtin_expect (errstring != NULL, 0))
 		      {
 			/* We are not interested in the error message.  */
 			assert (errstring != NULL);
-			if (errstring != _dl_out_of_memory)
+			if (malloced)
 			  free ((char *) errstring);
 
 			/* Simply ignore this error and continue the work.  */
@@ -316,8 +321,6 @@ _dl_map_object_deps (struct link_map *map,
 		  }
 		else
 		  {
-		    int err;
-
 		    /* Say that we are about to load an auxiliary library.  */
 		    if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS,
 					  0))
@@ -328,10 +331,16 @@ _dl_map_object_deps (struct link_map *map,
 					? l->l_name : rtld_progname);
 
 		    /* For filter objects the dependency must be available.  */
-		    err = _dl_catch_error (&objname, &errstring, openaux,
+		    bool malloced;
-					   &args);
+		    int err = _dl_catch_error (&objname, &errstring, &malloced,
+					       openaux, &args);
 		    if (__builtin_expect (errstring != NULL, 0))
 		      {
+			char *new_errstring = strdupa (errstring);
+			if (malloced)
+			  free ((char *) errstring);
+			errstring = new_errstring;
+
 			if (err)
 			  errno_reason = err;
 			else

elf/dl-error.c

@@ -19,6 +19,7 @@
 
 #include <libintl.h>
 #include <setjmp.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -30,6 +31,8 @@ struct catch
   {
     const char *objname;	/* Object/File name.  */
     const char *errstring;	/* Error detail filled in here.  */
+    bool malloced;		/* Nonzero if the string is malloced
+				   by the libc malloc.  */
     jmp_buf env;		/* longjmp here on error.  */
   };
 
@@ -44,8 +47,7 @@ struct catch
 /* This message we return as a last resort.  We define the string in a
    variable since we have to avoid freeing it and so have to enable
    a pointer comparison.  See below and in dlfcn/dlerror.c.  */
-const char _dl_out_of_memory[] = "out of memory";
+static const char _dl_out_of_memory[] = "out of memory";
-rtld_hidden_data_def (_dl_out_of_memory)
 
 
 /* This points to a function which is called when an continuable error is
@@ -87,15 +89,27 @@ _dl_signal_error (int errcode, const char *objname, const char *occation,
 
       lcatch->errstring = (char *) malloc (len_objname + len_errstring);
       if (lcatch->errstring != NULL)
+	{
 	  /* Make a copy of the object file name and the error string.  */
 	  lcatch->objname = memcpy (__mempcpy ((char *) lcatch->errstring,
 					       errstring, len_errstring),
 				    objname, len_objname);
+
+	  /* If the main executable is relocated it means the libc's malloc
+	     is used.  */
+#ifdef SHARED
+	  lcatch->malloced = (GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_relocated
+			      != 0);
+#else
+	  lcatch->malloced = true;
+#endif
+	}
       else
 	{
 	  /* This is better than nothing.  */
 	  lcatch->objname = "";
 	  lcatch->errstring = _dl_out_of_memory;
+	  lcatch->malloced = false;
 	}
       longjmp (lcatch->env, errcode ?: -1);
     }
@@ -140,7 +154,7 @@ _dl_signal_cerror (int errcode, const char *objname, const char *occation,
 int
 internal_function
 _dl_catch_error (const char **objname, const char **errstring,
-		 void (*operate) (void *), void *args)
+		 bool *mallocedp, void (*operate) (void *), void *args)
 {
   int errcode;
   struct catch *volatile old;
@@ -162,6 +176,7 @@ _dl_catch_error (const char **objname, const char **errstring,
       *catchp = old;
       *objname = NULL;
       *errstring = NULL;
+      *mallocedp = false;
       return 0;
     }
 
@@ -169,6 +184,7 @@ _dl_catch_error (const char **objname, const char **errstring,
   *catchp = old;
   *objname = c.objname;
   *errstring = c.errstring;
+  *mallocedp = c.malloced;
   return errcode == -1 ? 0 : errcode;
 }
 

elf/dl-libc.c

@@ -1,5 +1,5 @@
 /* Handle loading and unloading shared objects for internal libc purposes.
-   Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1999,2000,2001,2002,2004,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Zack Weinberg <zack@rabi.columbia.edu>, 1999.
 
@@ -42,12 +42,13 @@ dlerror_run (void (*operate) (void *), void *args)
 {
   const char *objname;
   const char *last_errstring = NULL;
-  int result;
+  bool malloced;
 
-  (void) GLRO(dl_catch_error) (&objname, &last_errstring, operate, args);
+  (void) GLRO(dl_catch_error) (&objname, &last_errstring, &malloced,
+			       operate, args);
 
-  result = last_errstring != NULL;
+  int result = last_errstring != NULL;
-  if (result && last_errstring != _dl_out_of_memory)
+  if (result && malloced)
     free ((char *) last_errstring);
 
   return result;

elf/dl-open.c

@@ -504,11 +504,6 @@ void *
 _dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,
 	  int argc, char *argv[], char *env[])
 {
-  struct dl_open_args args;
-  const char *objname;
-  const char *errstring;
-  int errcode;
-
   if ((mode & RTLD_BINDING_MASK) == 0)
     /* One of the flags must be set.  */
     _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));
@@ -543,6 +538,7 @@ no more namespaces available for dlmopen()"));
     _dl_signal_error (EINVAL, file, NULL,
 		      N_("invalid target namespace in dlmopen()"));
 
+  struct dl_open_args args;
   args.file = file;
   args.mode = mode;
   args.caller_dlopen = caller_dlopen;
@@ -552,7 +548,12 @@ no more namespaces available for dlmopen()"));
   args.argc = argc;
   args.argv = argv;
   args.env = env;
-  errcode = _dl_catch_error (&objname, &errstring, dl_open_worker, &args);
+
+  const char *objname;
+  const char *errstring;
+  bool malloced;
+  int errcode = _dl_catch_error (&objname, &errstring, &malloced,
+				 dl_open_worker, &args);
 
 #ifndef MAP_COPY
   /* We must munmap() the cache file.  */
@@ -603,7 +604,7 @@ no more namespaces available for dlmopen()"));
 	  memcpy (local_errstring, errstring, len_errstring);
 	}
 
-      if (errstring != _dl_out_of_memory)
+      if (malloced)
 	free ((char *) errstring);
 
       assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);

elf/rtld.c

@@ -61,6 +61,9 @@ static void print_missing_version (int errcode, const char *objname,
 /* Print the various times we collected.  */
 static void print_statistics (hp_timing_t *total_timep);
 
+/* Add audit objects.  */
+static void process_dl_audit (char *str);
+
 /* This is a list of all the modes the dynamic loader can be in.  */
 enum mode { normal, list, verify, trace };
 
@@ -771,6 +774,7 @@ do_preload (char *fname, struct link_map *main_map, const char *where)
   const char *objname;
   const char *err_str = NULL;
   struct map_args args;
+  bool malloced;
 
   args.str = fname;
   args.loader = main_map;
@@ -779,7 +783,7 @@ do_preload (char *fname, struct link_map *main_map, const char *where)
 
   unsigned int old_nloaded = GL(dl_ns)[LM_ID_BASE]._ns_nloaded;
 
-  (void) _dl_catch_error (&objname, &err_str, map_doit, &args);
+  (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args);
   if (__builtin_expect (err_str != NULL, 0))
     {
       _dl_error_printf ("\
@@ -923,6 +927,14 @@ dl_main (const ElfW(Phdr) *phdr,
 	  {
 	    GLRO(dl_inhibit_rpath) = INTUSE(_dl_argv)[2];
 
+	    _dl_skip_args += 2;
+	    _dl_argc -= 2;
+	    INTUSE(_dl_argv) += 2;
+	  }
+	else if (! strcmp (INTUSE(_dl_argv)[1], "--audit") && _dl_argc > 2)
+	  {
+	    process_dl_audit (INTUSE(_dl_argv)[2]);
+
 	    _dl_skip_args += 2;
 	    _dl_argc -= 2;
 	    INTUSE(_dl_argv) += 2;
@@ -983,12 +995,14 @@ of this helper program; chances are you did not intend to run this program.\n\
 	  const char *objname;
 	  const char *err_str = NULL;
 	  struct map_args args;
+	  bool malloced;
 
 	  args.str = rtld_progname;
 	  args.loader = NULL;
 	  args.is_preloaded = 0;
 	  args.mode = __RTLD_OPENEXEC;
-	  (void) _dl_catch_error (&objname, &err_str, map_doit, &args);
+	  (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit,
+				  &args);
 	  if (__builtin_expect (err_str != NULL, 0))
 	    /* We don't free the returned string, the programs stops
 	       anyway.  */
@@ -1398,13 +1412,16 @@ ld.so does not support TLS, but program uses it!\n");
 
 	  const char *objname;
 	  const char *err_str = NULL;
-	  (void) _dl_catch_error (&objname, &err_str, dlmopen_doit, &dlmargs);
+	  bool malloced;
+	  (void) _dl_catch_error (&objname, &err_str, &malloced, dlmopen_doit,
+				  &dlmargs);
 	  if (__builtin_expect (err_str != NULL, 0))
 	    {
 	    not_loaded:
 	      _dl_error_printf ("\
 ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
 				al->name, err_str);
+	      if (malloced)
 		free ((char *) err_str);
 	    }
 	  else
@@ -1414,7 +1431,8 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
 	      largs.map = dlmargs.map;
 
 	      /* Check whether the interface version matches.  */
-	      (void) _dl_catch_error (&objname, &err_str, lookup_doit, &largs);
+	      (void) _dl_catch_error (&objname, &err_str, &malloced,
+				      lookup_doit, &largs);
 
 	      unsigned int (*laversion) (unsigned int);
 	      unsigned int lav;
@@ -1455,8 +1473,8 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
 		  do
 		    {
 		      largs.name = cp;
-		      (void) _dl_catch_error (&objname, &err_str, lookup_doit,
+		      (void) _dl_catch_error (&objname, &err_str, &malloced,
-					      &largs);
+					      lookup_doit, &largs);
 
 		      /* Store the pointer.  */
 		      if (err_str == NULL && largs.result != NULL)

include/dlfcn.h

@@ -1,6 +1,7 @@
 #ifndef _DLFCN_H
 #include <dlfcn/dlfcn.h>
 #include <link.h>		/* For ElfW.  */
+#include <stdbool.h>
 
 /* Internally used flag.  */
 #define __RTLD_DLOPEN	0x80000000
@@ -67,9 +68,10 @@ extern void *_dl_vsym (void *handle, const char *name, const char *version,
    and the error code passed is the return value and *OBJNAME is set to
    the object name which experienced the problems.  ERRSTRING if nonzero
    points to a malloc'ed string which the caller has to free after use.
-   ARGS is passed as argument to OPERATE.  */
+   ARGS is passed as argument to OPERATE.  MALLOCEDP is set to true only
+   if the returned string is allocated using the libc's malloc.  */
 extern int _dl_catch_error (const char **objname, const char **errstring,
-			    void (*operate) (void *),
+			    bool *mallocedp, void (*operate) (void *),
 			    void *args)
      internal_function;