* 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.

1 files changed, 9 insertions, 4 deletions

diff --git a/sysdeps/generic/libc-tls.c b/sysdeps/generic/libc-tls.c
index 756a2bf57c..5861e99e54 100644
--- a/sysdeps/generic/libc-tls.c
+++ b/sysdeps/generic/libc-tls.c
@@ -21,6 +21,7 @@
 #include <ldsodefs.h>
 #include <tls.h>
 #include <unistd.h>
+#include <stdio.h>
 
 #ifdef SHARED
  #error makefile bug, this file is for static only
@@ -168,8 +169,8 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
   /* Initialize the TLS block.  */
 # if TLS_TCB_AT_TP
   static_dtv[2].pointer = ((char *) tlsblock + tcb_offset
-			   - roundup (memsz, align));
-  static_map.l_tls_offset = roundup (memsz, align);
+			   - roundup (memsz, align ?: 1));
+  static_map.l_tls_offset = roundup (memsz, align ?: 1);
 # elif TLS_DTV_AT_TP
   tcb_offset = roundup (tcbsize, align);
   static_dtv[2].pointer = (char *) tlsblock + tcb_offset;
@@ -177,8 +178,10 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
 # else
 #  error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
 # endif
+  /* sbrk gives us zero'd memory, so we don't need this.
   memset (__mempcpy (static_dtv[2].pointer, initimage, filesz),
 	  '\0', memsz - filesz);
+  */
 
   /* Install the pointer to the dtv.  */
 
@@ -186,13 +189,15 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
 # if TLS_TCB_AT_TP
   INSTALL_DTV ((char *) tlsblock + tcb_offset, static_dtv);
 
-  TLS_INIT_TP ((char *) tlsblock + tcb_offset, 0);
+  const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset, 0);
 # elif TLS_DTV_AT_TP
   INSTALL_DTV (tlsblock, static_dtv);
-  TLS_INIT_TP (tlsblock, 0);
+  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))
+    __libc_fatal (lossage);
 
   /* We have to create a fake link map which normally would be created
      by the dynamic linker.  It just has to have enough information to