ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486]

Exporting functions and relying on symbol interposition from libc.so
makes the choice of implementation dependent on DT_NEEDED order, which
is not what some compiler drivers expect.

This commit replaces one magic mechanism (symbol interposition) with
another one (preprocessor-/compiler-based redirection).  This makes
the hand-over from the minimal malloc to the full malloc more
explicit.

Removing the ABI symbols is backwards-compatible because libc.so is
always in scope, and the dynamic loader will find the malloc-related
symbols there since commit f0b2132b35
("ld.so: Support moving versioned symbols between sonames
[BZ #24741]").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

elf/Makefile

@@ -488,7 +488,11 @@ $(objpfx)dl-allobjs.os: $(all-rtld-routines:%=$(objpfx)%.os)
 # their implementation is provided differently in rtld, and the symbol
 # discovery mechanism is not compatible with the libc implementation
 # when compiled for libc.
-rtld-stubbed-symbols =
+rtld-stubbed-symbols = \
+  calloc \
+  free \
+  malloc \
+  realloc \
 
 # The GCC arguments that implement $(rtld-stubbed-symbols).
 rtld-stubbed-symbols-args = \

elf/Versions

@@ -35,9 +35,6 @@ libc {
 
 ld {
   GLIBC_2.0 {
-    # Functions which are interposed from libc.so.
-    calloc; free; malloc; realloc;
-
     _r_debug;
   }
   GLIBC_2.1 {

elf/dl-lookup.c

@@ -291,7 +291,7 @@ do_lookup_unique (const char *undef_name, uint_fast32_t new_hash,
 	  tab->size = newsize;
 	  size = newsize;
 	  entries = tab->entries = newentries;
-	  tab->free = free;
+	  tab->free = __rtld_free;
 	}
     }
   else
@@ -322,7 +322,7 @@ do_lookup_unique (const char *undef_name, uint_fast32_t new_hash,
 
       tab->entries = entries;
       tab->size = size;
-      tab->free = free;
+      tab->free = __rtld_free;
     }
 
   if ((type_class & ELF_RTYPE_CLASS_COPY) != 0)

elf/dl-minimal.c

@@ -26,11 +26,87 @@
 #include <sys/param.h>
 #include <sys/types.h>
 #include <ldsodefs.h>
+#include <dl-irel.h>
+#include <dl-hash.h>
+#include <dl-sym-post.h>
 #include <_itoa.h>
 #include <malloc/malloc-internal.h>
 
 #include <assert.h>
 
+/* The rtld startup code calls __rtld_malloc_init_stubs after the
+  first self-relocation to adjust the pointers to the minimal
+  implementation below.  Before the final relocation,
+  __rtld_malloc_init_real is called to replace the pointers with the
+  real implementation.  */
+__typeof (calloc) *__rtld_calloc;
+__typeof (free) *__rtld_free;
+__typeof (malloc) *__rtld_malloc;
+__typeof (realloc) *__rtld_realloc;
+
+/* Defined below.  */
+static __typeof (calloc) rtld_calloc attribute_relro;
+static __typeof (free) rtld_free attribute_relro;
+static __typeof (malloc) rtld_malloc attribute_relro;
+static __typeof (realloc) rtld_realloc attribute_relro;
+
+void
+__rtld_malloc_init_stubs (void)
+{
+  __rtld_calloc = &rtld_calloc;
+  __rtld_free = &rtld_free;
+  __rtld_malloc = &rtld_malloc;
+  __rtld_realloc = &rtld_realloc;
+}
+
+/* Lookup NAME at VERSION in the scope of MATCH.  */
+static void *
+lookup_malloc_symbol (struct link_map *main_map, const char *name,
+		      struct r_found_version *version)
+{
+
+  const ElfW(Sym) *ref = NULL;
+  lookup_t result = _dl_lookup_symbol_x (name, main_map, &ref,
+					 main_map->l_scope,
+					 version, 0, 0, NULL);
+
+  assert (ELFW(ST_TYPE) (ref->st_info) != STT_TLS);
+  void *value = DL_SYMBOL_ADDRESS (result, ref);
+
+  return _dl_sym_post (result, ref, value, 0, main_map);
+}
+
+void
+__rtld_malloc_init_real (struct link_map *main_map)
+{
+  /* We cannot use relocations and initializers for this because the
+     changes made by __rtld_malloc_init_stubs break REL-style
+     (non-RELA) relocations that depend on the previous pointer
+     contents.  Also avoid direct relocation depedencies for the
+     malloc symbols so this function can be called before the final
+     rtld relocation (which enables RELRO, after which the pointer
+     variables cannot be written to).  */
+
+  struct r_found_version version;
+  version.name = symbol_version_string (libc, GLIBC_2_0);
+  version.hidden = 0;
+  version.hash = _dl_elf_hash (version.name);
+  version.filename = NULL;
+
+  void *new_calloc = lookup_malloc_symbol (main_map, "calloc", &version);
+  void *new_free = lookup_malloc_symbol (main_map, "free", &version);
+  void *new_malloc = lookup_malloc_symbol (main_map, "malloc", &version);
+  void *new_realloc = lookup_malloc_symbol (main_map, "realloc", &version);
+
+  /* Update the pointers in one go, so that any internal allocations
+     performed by lookup_malloc_symbol see a consistent
+     implementation.  */
+  __rtld_calloc = new_calloc;
+  __rtld_free = new_free;
+  __rtld_malloc = new_malloc;
+  __rtld_realloc = new_realloc;
+}
+
 /* Minimal malloc allocator for used during initial link.  After the
    initial link, a full malloc implementation is interposed, either
    the one in libc, or a different one supplied by the user through
@@ -38,14 +114,9 @@
 
 static void *alloc_ptr, *alloc_end, *alloc_last_block;
 
-/* Declarations of global functions.  */
-extern void weak_function free (void *ptr);
-extern void * weak_function realloc (void *ptr, size_t n);
-
-
 /* Allocate an aligned memory block.  */
-void * weak_function
+static void *
-malloc (size_t n)
+rtld_malloc (size_t n)
 {
   if (alloc_end == 0)
     {
@@ -87,8 +158,8 @@ malloc (size_t n)
 /* We use this function occasionally since the real implementation may
    be optimized when it can assume the memory it returns already is
    set to NUL.  */
-void * weak_function
+static void *
-calloc (size_t nmemb, size_t size)
+rtld_calloc (size_t nmemb, size_t size)
 {
   /* 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,
@@ -104,8 +175,8 @@ calloc (size_t nmemb, size_t size)
 }
 
 /* This will rarely be called.  */
-void weak_function
+void
-free (void *ptr)
+rtld_free (void *ptr)
 {
   /* We can free only the last block allocated.  */
   if (ptr == alloc_last_block)
@@ -118,8 +189,8 @@ free (void *ptr)
 }
 
 /* This is only called with the most recent block returned by malloc.  */
-void * weak_function
+void *
-realloc (void *ptr, size_t n)
+rtld_realloc (void *ptr, size_t n)
 {
   if (ptr == NULL)
     return malloc (n);

elf/rtld.c

@@ -534,6 +534,9 @@ _dl_start (void *arg)
      header table in core.  Put the rest of _dl_start into a separate
      function, that way the compiler cannot put accesses to the GOT
      before ELF_DYNAMIC_RELOCATE.  */
+
+  __rtld_malloc_init_stubs ();
+
   {
 #ifdef DONT_USE_BOOTSTRAP_MAP
     ElfW(Addr) entry = _dl_start_final (arg);
@@ -2210,6 +2213,10 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
 	  rtld_timer_stop (&relocate_time, start);
 	}
 
+      /* The library defining malloc has already been relocated due to
+	 prelinking.  Resolve the malloc symbols for the dynamic
+	 loader.  */
+      __rtld_malloc_init_real (main_map);
 
       /* Mark all the objects so we know they have been already relocated.  */
       for (struct link_map *l = main_map; l != NULL; l = l->l_next)
@@ -2310,6 +2317,11 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
 	 re-relocation, we might call a user-supplied function
 	 (e.g. calloc from _dl_relocate_object) that uses TLS data.  */
 
+      /* The malloc implementation has been relocated, so resolving
+	 its symbols (and potentially calling IFUNC resolvers) is safe
+	 at this point.  */
+      __rtld_malloc_init_real (main_map);
+
       RTLD_TIMING_VAR (start);
       rtld_timer_start (&start);
 

include/inline-hashtab.h

@@ -51,7 +51,7 @@ htab_create (void)
     return NULL;
   ht->size = 3;
   ht->entries = malloc (sizeof (void *) * ht->size);
-  ht->free = free;
+  ht->free = __rtld_free;
   if (! ht->entries)
     {
       free (ht);
@@ -167,7 +167,7 @@ htab_expand (struct hashtab *htab, int (*hash_fn) (void *))
 
   /* Use the free() corresponding to the malloc() above to free this
      up.  */
-  htab->free = free;
+  htab->free = __rtld_free;
 
   return 1;
 }

include/libc-symbols.h

@@ -421,7 +421,14 @@ for linking")
 #  define _default_symbol_version(real, name, version) \
      __asm__ (".symver " #real "," #name "@@" #version)
 # endif
-#else
+
+/* Evalutes to a string literal for VERSION in LIB.  */
+# define symbol_version_string(lib, version) \
+  _symbol_version_stringify_1 (VERSION_##lib##_##version)
+# define _symbol_version_stringify_1(arg) _symbol_version_stringify_2 (arg)
+# define _symbol_version_stringify_2(arg) #arg
+
+#else /* !SHARED */
 # define symbol_version(real, name, version)
 # define default_symbol_version(real, name, version) \
   strong_alias(real, name)

include/malloc.h

@@ -1,7 +1,9 @@
 #ifndef _MALLOC_H
+
 #include <malloc/malloc.h>
 
 # ifndef _ISOMAC
+#  include <rtld-malloc.h>
 
 /* In the GNU libc we rename the global variable
    `__malloc_initialized' to `__libc_malloc_initialized'.  */

include/rtld-malloc.h

@@ -0,0 +1,85 @@
+/* Redirection of malloc inside the dynamic linker.
+   Copyright (C) 2020 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* The dynamic linker needs to use its own minimal malloc before libc
+   has been relocated, and the libc malloc afterwards.  The active
+   malloc implementation is reached via the __rtld_* function pointers
+   declared below.  They are initialized to the minimal malloc by
+   __rtld_malloc_init_stubs, and set to the final implementation by
+   __rtld_malloc_init_real.  */
+
+#ifndef _RTLD_MALLOC_H
+#define _RTLD_MALLOC_H
+
+#if IS_IN (rtld)
+
+extern __typeof (calloc) *__rtld_calloc attribute_hidden;
+extern __typeof (free) *__rtld_free attribute_hidden;
+extern __typeof (malloc) *__rtld_malloc attribute_hidden;
+extern __typeof (realloc) *__rtld_realloc attribute_hidden;
+
+/* Wrapper functions which call through the function pointers above.
+   Note that it is not supported to take the address of those
+   functions.  Instead the function pointers must be used
+   directly.  */
+
+__extern_inline void *
+calloc (size_t a, size_t b)
+{
+  return __rtld_calloc (a, b);
+}
+
+__extern_inline void
+free (void *ptr)
+{
+   __rtld_free (ptr);
+}
+
+__extern_inline void *
+malloc (size_t size)
+{
+  return __rtld_malloc (size);
+}
+
+__extern_inline void *
+realloc (void *ptr, size_t size)
+{
+  return __rtld_realloc (ptr, size);
+}
+
+/* Called after the first self-relocation to activate the minimal malloc
+   implementation.  */
+void __rtld_malloc_init_stubs (void) attribute_hidden;
+
+/* Called shortly before the final self-relocation (when RELRO
+   variables are still writable) to activate the real malloc
+   implementation.  MAIN_MAP is the link map of the executable.  */
+struct link_map;
+void __rtld_malloc_init_real (struct link_map *main_map) attribute_hidden;
+
+#else /* !IS_IN (rtld) */
+
+/* This allows static/non-rtld builds to get a pointer to the
+   functions, in the same way that is required inside rtld.  */
+# define __rtld_calloc (&calloc)
+# define __rtld_free (&free)
+# define __rtld_malloc (&malloc)
+# define __rtld_realloc (&realloc)
+
+#endif /* !IS_IN (rtld) */
+#endif /* _RTLD_MALLOC_H */

include/stdlib.h

@@ -9,6 +9,8 @@
 #if !defined _ISOMAC
 # include <sys/stat.h>
 
+# include <rtld-malloc.h>
+
 extern __typeof (strtol_l) __strtol_l;
 extern __typeof (strtoul_l) __strtoul_l;
 extern __typeof (strtoll_l) __strtoll_l;

sysdeps/generic/localplt.data

@@ -7,12 +7,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/mach/hurd/i386/ld.abilist

@@ -16,10 +16,6 @@ GLIBC_2.2.6 _dl_mcount F
 GLIBC_2.2.6 _hurd_intr_rpc_mach_msg F
 GLIBC_2.2.6 _r_debug D 0x14
 GLIBC_2.2.6 abort F
-GLIBC_2.2.6 calloc F
-GLIBC_2.2.6 free F
-GLIBC_2.2.6 malloc F
-GLIBC_2.2.6 realloc F
 GLIBC_2.3 ___tls_get_addr F
 GLIBC_2.3 __tls_get_addr F
 GLIBC_2.4 __stack_chk_guard D 0x4

sysdeps/mach/hurd/i386/localplt.data

@@ -9,12 +9,6 @@ libc.so: malloc + REL R_386_GLOB_DAT
 libc.so: memalign + REL R_386_GLOB_DAT
 libc.so: realloc + REL R_386_GLOB_DAT
 libm.so: matherr + REL R_386_GLOB_DAT
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc + REL R_386_GLOB_DAT
-ld.so: calloc + REL R_386_GLOB_DAT
-ld.so: realloc + REL R_386_GLOB_DAT
-ld.so: free + REL R_386_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error + REL R_386_GLOB_DAT
 ld.so: _dl_catch_error + REL R_386_GLOB_DAT

sysdeps/unix/sysv/linux/aarch64/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.17 __stack_chk_guard D 0x8
 GLIBC_2.17 __tls_get_addr F
 GLIBC_2.17 _dl_mcount F
 GLIBC_2.17 _r_debug D 0x28
-GLIBC_2.17 calloc F
-GLIBC_2.17 free F
-GLIBC_2.17 malloc F
-GLIBC_2.17 realloc F

sysdeps/unix/sysv/linux/aarch64/localplt.data

@@ -9,12 +9,6 @@ libc.so: realloc
 libm.so: matherr
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/alpha/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x28
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x8
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/alpha/localplt.data

@@ -26,12 +26,6 @@ libm.so: matherr + RELA R_ALPHA_GLOB_DAT
 libm.so: __atan2
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr ?
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc + RELA R_ALPHA_GLOB_DAT
-ld.so: calloc + RELA R_ALPHA_GLOB_DAT
-ld.so: realloc + RELA R_ALPHA_GLOB_DAT
-ld.so: free + RELA R_ALPHA_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error + RELA R_ALPHA_GLOB_DAT
 ld.so: _dl_catch_error + RELA R_ALPHA_GLOB_DAT

sysdeps/unix/sysv/linux/arm/be/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.4 __stack_chk_guard D 0x4
 GLIBC_2.4 __tls_get_addr F
 GLIBC_2.4 _dl_mcount F
 GLIBC_2.4 _r_debug D 0x14
-GLIBC_2.4 calloc F
-GLIBC_2.4 free F
-GLIBC_2.4 malloc F
-GLIBC_2.4 realloc F

sysdeps/unix/sysv/linux/arm/le/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.4 __stack_chk_guard D 0x4
 GLIBC_2.4 __tls_get_addr F
 GLIBC_2.4 _dl_mcount F
 GLIBC_2.4 _r_debug D 0x14
-GLIBC_2.4 calloc F
-GLIBC_2.4 free F
-GLIBC_2.4 malloc F
-GLIBC_2.4 realloc F

sysdeps/unix/sysv/linux/arm/localplt.data

@@ -8,12 +8,6 @@ libm.so: matherr
 libpthread.so: raise
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/csky/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.29 __stack_chk_guard D 0x4
 GLIBC_2.29 __tls_get_addr F
 GLIBC_2.29 _dl_mcount F
 GLIBC_2.29 _r_debug D 0x14
-GLIBC_2.29 calloc F
-GLIBC_2.29 free F
-GLIBC_2.29 malloc F
-GLIBC_2.29 realloc F

sysdeps/unix/sysv/linux/csky/localplt.data

@@ -6,12 +6,6 @@ libc.so: free
 libc.so: malloc
 libc.so: memalign
 libc.so: realloc
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/hppa/ld.abilist

@@ -1,9 +1,5 @@
 GLIBC_2.2 __libc_stack_end D 0x4
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x14
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_addr F
 GLIBC_2.4 __stack_chk_guard D 0x4

sysdeps/unix/sysv/linux/hppa/localplt.data

@@ -10,12 +10,6 @@ libc.so: __sigsetjmp
 libc.so: _IO_funlockfile
 libc.so: __errno_location
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/i386/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x4
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.3 ___tls_get_addr F

sysdeps/unix/sysv/linux/i386/localplt.data

@@ -7,12 +7,6 @@ libc.so: malloc + REL R_386_GLOB_DAT
 libc.so: memalign + REL R_386_GLOB_DAT
 libc.so: realloc + REL R_386_GLOB_DAT
 libm.so: matherr + REL R_386_GLOB_DAT
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc + REL R_386_GLOB_DAT
-ld.so: calloc + REL R_386_GLOB_DAT
-ld.so: realloc + REL R_386_GLOB_DAT
-ld.so: free + REL R_386_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error + REL R_386_GLOB_DAT
 ld.so: _dl_catch_error + REL R_386_GLOB_DAT

sysdeps/unix/sysv/linux/ia64/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.2 __libc_stack_end D 0x8
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x28
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/ia64/localplt.data

@@ -6,12 +6,6 @@ libc.so: realloc
 libm.so: matherr
 libm.so: matherrf
 libm.so: matherrl
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/m68k/coldfire/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.4 __stack_chk_guard D 0x4
 GLIBC_2.4 __tls_get_addr F
 GLIBC_2.4 _dl_mcount F
 GLIBC_2.4 _r_debug D 0x14
-GLIBC_2.4 calloc F
-GLIBC_2.4 free F
-GLIBC_2.4 malloc F
-GLIBC_2.4 realloc F

sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data

@@ -5,12 +5,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/m68k/m680x0/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x4
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data

@@ -6,12 +6,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/microblaze/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.18 __stack_chk_guard D 0x4
 GLIBC_2.18 __tls_get_addr F
 GLIBC_2.18 _dl_mcount F
 GLIBC_2.18 _r_debug D 0x14
-GLIBC_2.18 calloc F
-GLIBC_2.18 free F
-GLIBC_2.18 malloc F
-GLIBC_2.18 realloc F

sysdeps/unix/sysv/linux/microblaze/localplt.data

@@ -7,12 +7,6 @@ libc.so: realloc
 libm.so: matherr
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr ?
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/mips/mips32/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.2 __libc_stack_end D 0x4
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/mips/mips64/n32/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.2 __libc_stack_end D 0x4
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/mips/mips64/n64/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x28
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.2 __libc_stack_end D 0x8
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/nios2/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.21 __stack_chk_guard D 0x4
 GLIBC_2.21 __tls_get_addr F
 GLIBC_2.21 _dl_mcount F
 GLIBC_2.21 _r_debug D 0x14
-GLIBC_2.21 calloc F
-GLIBC_2.21 free F
-GLIBC_2.21 malloc F
-GLIBC_2.21 realloc F

sysdeps/unix/sysv/linux/nios2/localplt.data

@@ -28,12 +28,6 @@ libc.so: __eqdf2
 libc.so: __extendsfdf2
 libc.so: __floatundidf ?
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data

@@ -5,12 +5,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x4
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.22 __tls_get_addr_opt F

sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data

@@ -36,12 +36,6 @@ libc.so: realloc
 libm.so: copysignl ?
 libm.so: fabsl
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/powerpc/powerpc64/be/ld.abilist

@@ -4,7 +4,3 @@ GLIBC_2.3 __libc_stack_end D 0x8
 GLIBC_2.3 __tls_get_addr F
 GLIBC_2.3 _dl_mcount F
 GLIBC_2.3 _r_debug D 0x28
-GLIBC_2.3 calloc F
-GLIBC_2.3 free F
-GLIBC_2.3 malloc F
-GLIBC_2.3 realloc F

sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ld.abilist

@@ -2,9 +2,5 @@ GLIBC_2.17 __libc_stack_end D 0x8
 GLIBC_2.17 __tls_get_addr F
 GLIBC_2.17 _dl_mcount F
 GLIBC_2.17 _r_debug D 0x28
-GLIBC_2.17 calloc F
-GLIBC_2.17 free F
-GLIBC_2.17 malloc F
-GLIBC_2.17 realloc F
 GLIBC_2.22 __tls_get_addr_opt F
 GLIBC_2.23 __parse_hwcap_and_convert_at_platform F

sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data

@@ -4,12 +4,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/riscv/localplt.data

@@ -6,12 +6,6 @@ libc.so: free
 libc.so: malloc
 libc.so: memalign
 libc.so: realloc
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist

@@ -3,7 +3,3 @@ GLIBC_2.27 __stack_chk_guard D 0x8
 GLIBC_2.27 __tls_get_addr F
 GLIBC_2.27 _dl_mcount F
 GLIBC_2.27 _r_debug D 0x28
-GLIBC_2.27 calloc F
-GLIBC_2.27 free F
-GLIBC_2.27 malloc F
-GLIBC_2.27 realloc F

sysdeps/unix/sysv/linux/s390/localplt.data

@@ -5,12 +5,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/s390/s390-32/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x4
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.3 __tls_get_offset F

sysdeps/unix/sysv/linux/s390/s390-64/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.2 __libc_stack_end D 0x8
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x28
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_offset F

sysdeps/unix/sysv/linux/sh/be/ld.abilist

@@ -1,9 +1,5 @@
 GLIBC_2.2 __libc_stack_end D 0x4
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x14
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_addr F
 GLIBC_2.4 __stack_chk_guard D 0x4

sysdeps/unix/sysv/linux/sh/le/ld.abilist

@@ -1,9 +1,5 @@
 GLIBC_2.2 __libc_stack_end D 0x4
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x14
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_addr F
 GLIBC_2.4 __stack_chk_guard D 0x4

sysdeps/unix/sysv/linux/sh/localplt.data

@@ -12,12 +12,6 @@ libc.so: __errno_location
 libm.so: matherr
 # Generated by the compiler because there is no trap insn pattern.
 libc.so: abort ?
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.0 _r_debug D 0x14
-GLIBC_2.0 calloc F
-GLIBC_2.0 free F
-GLIBC_2.0 malloc F
-GLIBC_2.0 realloc F
 GLIBC_2.1 __libc_stack_end D 0x4
 GLIBC_2.1 _dl_mcount F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data

@@ -19,12 +19,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.2 __libc_stack_end D 0x8
 GLIBC_2.2 _dl_mcount F
 GLIBC_2.2 _r_debug D 0x28
-GLIBC_2.2 calloc F
-GLIBC_2.2 free F
-GLIBC_2.2 malloc F
-GLIBC_2.2 realloc F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data

@@ -18,12 +18,6 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc
-ld.so: calloc
-ld.so: realloc
-ld.so: free
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
 ld.so: _dl_catch_error

sysdeps/unix/sysv/linux/x86_64/64/ld.abilist

@@ -1,8 +1,4 @@
 GLIBC_2.2.5 __libc_stack_end D 0x8
 GLIBC_2.2.5 _dl_mcount F
 GLIBC_2.2.5 _r_debug D 0x28
-GLIBC_2.2.5 calloc F
-GLIBC_2.2.5 free F
-GLIBC_2.2.5 malloc F
-GLIBC_2.2.5 realloc F
 GLIBC_2.3 __tls_get_addr F

sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist

@@ -2,7 +2,3 @@ GLIBC_2.16 __libc_stack_end D 0x4
 GLIBC_2.16 __tls_get_addr F
 GLIBC_2.16 _dl_mcount F
 GLIBC_2.16 _r_debug D 0x14
-GLIBC_2.16 calloc F
-GLIBC_2.16 free F
-GLIBC_2.16 malloc F
-GLIBC_2.16 realloc F

sysdeps/x86_64/localplt.data

@@ -9,12 +9,6 @@ libc.so: malloc + RELA R_X86_64_GLOB_DAT
 libc.so: memalign + RELA R_X86_64_GLOB_DAT
 libc.so: realloc + RELA R_X86_64_GLOB_DAT
 libm.so: matherr + RELA R_X86_64_GLOB_DAT
-# The main malloc is interposed into the dynamic linker, for
-# allocations after the initial link (when dlopen is used).
-ld.so: malloc + RELA R_X86_64_GLOB_DAT
-ld.so: calloc + RELA R_X86_64_GLOB_DAT
-ld.so: realloc + RELA R_X86_64_GLOB_DAT
-ld.so: free + RELA R_X86_64_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error + RELA R_X86_64_GLOB_DAT
 ld.so: _dl_catch_error + RELA R_X86_64_GLOB_DAT