* sysdeps/generic/libc-tls.c (__libc_setup_tls): Cope with zero ALIGN.

	* malloc/hooks.c [_LIBC && (USE___THREAD || (USE_TLS && !SHARED))]
	(malloc_starter, memalign_starter, free_starter): Don't define these.
	* malloc/malloc.c [_LIBC && (USE___THREAD || (USE_TLS && !SHARED))]:
	Don't declare them either.
	* malloc/arena.c (ptmalloc_init) [_LIBC && USE_TLS]: Don't call
	__pthread_initialize, so no need to set hooks to *_starter.
	(ptmalloc_init_minimal): New function, broken out of ptmalloc_init.
	[_LIBC && SHARED && USE_TLS && !USE___THREAD]
	(__libc_malloc_pthread_startup): New function.
	* malloc/Versions (libc: GLIBC_PRIVATE): New set, add that function.

	* malloc/hooks.c (memalign_starter): New function.
	* malloc/malloc.c: Declare it.
	* malloc/arena.c (save_memalign_hook): New variable.
	(ptmalloc_init): Set __memalign_hook to memalign_starter.

	* elf/dl-minimal.c (free): Clear the memory.
	(calloc): Just call malloc, knowing all memory it returns is cleared.

	* sysdeps/generic/dl-tls.c (allocate_dtv): Use calloc instead of
	malloc and memset; calloc can avoid the zeroing when redundant.
	(_dl_tls_setup): Likewise.
	* elf/dl-load.c (decompose_rpath): Likewise.
	* sysdeps/generic/libc-tls.c (__libc_setup_tls): Comment out memset
	call, since memory from sbrk at startup is already zero.

	* elf/rtld.c (_dl_start, dl_main): TLS_INIT_TP macro now returns an
	error string for failure, null for success.  Update callers.
	* sysdeps/generic/libc-tls.c (__libc_setup_tls): Likewise.
	* elf/dl-load.c (_dl_map_object_from_fd): Likewise.

3 files changed, 24 insertions, 15 deletions

diff --git a/elf/dl-load.c b/elf/dl-load.c
index d80f308..9d9ba94 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -513,8 +513,7 @@ decompose_rpath (struct r_search_path_struct *sps,
 	    {
 	      /* This object is on the list of objects for which the
 		 RUNPATH and RPATH must not be used.  */
-	      result = (struct r_search_path_elem **)
-		malloc (sizeof (*result));
+	      result = calloc (1, sizeof *result);
 	      if (result == NULL)
 		{
 		signal_error_cache:
@@ -523,8 +522,6 @@ decompose_rpath (struct r_search_path_struct *sps,
 		  INTUSE(_dl_signal_error) (ENOMEM, NULL, NULL, errstring);
 		}
 
-	      result[0] = NULL;
-
 	      sps->dirs = result;
 	      sps->malloced = 1;
 
@@ -994,7 +991,8 @@ cannot allocate TLS data structures for initial thread");
 		}
 
 	      /* Now we install the TCB in the thread register.  */
-	      if (__builtin_expect (TLS_INIT_TP (tcb, 0), 0) != -1)
+	      errstring = TLS_INIT_TP (tcb, 0);
+	      if (__builtin_expect (errstring == NULL, 1))
 		{
 		  /* Now we are all good.  */
 		  l->l_tls_modid = ++GL(dl_tls_max_dtv_idx);
@@ -1002,7 +1000,9 @@ cannot allocate TLS data structures for initial thread");
 		}
 
 	      /* The kernel is too old or somesuch.  */
+	      errval = 0;
 	      _dl_deallocate_tls (tcb, 1);
+	      goto call_lose;
 	    }
 #endif
 
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index d1619cf..3a51df3 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -104,9 +104,10 @@ malloc (size_t n)
 void * weak_function
 calloc (size_t nmemb, size_t size)
 {
-  size_t total = nmemb * size;
-  void *result = malloc (total);
-  return memset (result, '\0', total);
+  /* New memory from the trivial malloc above is always already cleared.
+     (We make sure that's true in the rare occasion it might not be,
+     by clearing memory in free, below.)  */
+  return malloc (nmemb * size);
 }
 
 /* This will rarely be called.  */
@@ -115,7 +116,12 @@ free (void *ptr)
 {
   /* We can free only the last block allocated.  */
   if (ptr == alloc_last_block)
-    alloc_ptr = alloc_last_block;
+    {
+      /* Since this is rare, we clear the freed block here
+	 so that calloc can presume malloc returns cleared memory.  */
+      memset (alloc_last_block, '\0', alloc_ptr - alloc_last_block);
+      alloc_ptr = alloc_last_block;
+    }
 }
 
 /* This is only called with the most recent block returned by malloc.  */
diff --git a/elf/rtld.c b/elf/rtld.c
index f188643..e43a0e9 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -404,16 +404,17 @@ _dl_start (void *arg)
 	INSTALL_DTV ((char *) tlsblock + bootstrap_map.l_tls_offset,
 		     initdtv);
 
-	if (TLS_INIT_TP ((char *) tlsblock + bootstrap_map.l_tls_offset, 0)
-	    != 0)
-	  _dl_fatal_printf ("cannot setup thread-local storage\n");
+	const char *lossage = TLS_INIT_TP ((char *) tlsblock
+					   + bootstrap_map.l_tls_offset, 0);
 # elif TLS_DTV_AT_TP
 	INSTALL_DTV (tlsblock, initdtv);
-	if (TLS_INIT_TP (tlsblock, 0) != 0)
-	  _dl_fatal_printf ("cannot setup thread-local storage\n");
+	const char *lossage = TLS_INIT_TP (tlsblock, 0);
 # else
 #  error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
 # endif
+	if (__builtin_expect (lossage != NULL, 0))
+	  _dl_fatal_printf ("cannot set up thread-local storage: %s\n",
+			    lossage);
 
 	/* So far this is module number one.  */
 	bootstrap_map.l_tls_modid = 1;
@@ -1564,7 +1565,9 @@ cannot allocate TLS data structures for initial thread");
 
       /* And finally install it for the main thread.  If ld.so itself uses
 	 TLS we know the thread pointer was initialized earlier.  */
-      TLS_INIT_TP (tcbp, USE___THREAD);
+      const char *lossage = TLS_INIT_TP (tcbp, USE___THREAD);
+      if (__builtin_expect (lossage != NULL, 0))
+	_dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
     }
 #endif