Add reallocarray function

The reallocarray function is an extension from OpenBSD.  It is an
integer-overflow-safe replacement for realloc(p, X*Y) and
malloc(X*Y) (realloc(NULL, X*Y)).  It can therefore help in preventing
certain security issues in code.

This is an updated version of a patch originally submitted by Rüdiger
Sonderfeld in May 2014 [1].

Checked on i686-linux-gnu and x86_64-linux-gnu.

[1] <https://sourceware.org/ml/libc-alpha/2014-05/msg00481.html>.

2017-05-30  Dennis Wölfing  <denniswoelfing@gmx.de>
            Rüdiger Sonderfeld  <ruediger@c-plusplus.de>

	* include/stdlib.h (__libc_reallocarray): New declaration.
	* malloc/Makefile (routines): Add reallocarray.
	(tests): Add tst-reallocarray.c.
	* malloc/Versions: Add reallocarray and __libc_reallocarray.
	* malloc/malloc-internal.h (check_mul_overflow_size_t): New inline
	function.
	* malloc/malloc.h (reallocarray): New declaration.
	* stdlib/stdlib.h (reallocarray): Likewise.
	* malloc/reallocarray.c: New file.
	* malloc/tst-reallocarray.c: New test file.
	* manual/memory.texi: Document reallocarray.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist: Add reallocarray.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tilepro/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.

39 files changed, 344 insertions, 12 deletions

diff --git a/ChangeLog b/ChangeLog
index 92d762e48c..876244a00a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,48 @@
+2017-05-30  Dennis Wölfing  <denniswoelfing@gmx.de>
+	    Rüdiger Sonderfeld  <ruediger@c-plusplus.de>
+
+	* include/stdlib.h (__libc_reallocarray): New declaration.
+	* malloc/Makefile (routines): Add reallocarray.
+	(tests): Add tst-reallocarray.c.
+	* malloc/Versions: Add reallocarray and __libc_reallocarray.
+	* malloc/malloc-internal.h (check_mul_overflow_size_t): New inline
+	function.
+	* malloc/malloc.h (reallocarray): New declaration.
+	* stdlib/stdlib.h (reallocarray): Likewise.
+	* malloc/reallocarray.c: New file.
+	* malloc/tst-reallocarray.c: New test file.
+	* manual/memory.texi: Document reallocarray.
+	* sysdeps/unix/sysv/linux/aarch64/libc.abilist: Add reallocarray.
+	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/tilepro/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
+
 2017-05-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* sysdeps/x86_64/memchr.S (memchr): Use 32-bit registers for
diff --git a/NEWS b/NEWS
index b4ecd6201d..f92392a3f8 100644
--- a/NEWS
+++ b/NEWS
@@ -66,6 +66,10 @@ Version 2.26
 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
   removed.
 
+* The reallocarray function has been added to libc.  It is a realloc
+  replacement with a check for integer overflow when calculating total
+  allocation size.
+
 Security related changes:
 
 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
diff --git a/include/stdlib.h b/include/stdlib.h
index c3ee680bd6..5847445fd3 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -110,6 +110,10 @@ extern int __posix_memalign (void **memptr, size_t alignment, size_t size);
 extern void *__libc_memalign (size_t alignment, size_t size)
      __attribute_malloc__;
 
+extern void *__libc_reallocarray (void *__ptr, size_t __nmemb, size_t __size)
+     __THROW __attribute_warn_unused_result__;
+libc_hidden_proto (__libc_reallocarray)
+
 extern int __libc_system (const char *line);
 
 
diff --git a/malloc/Makefile b/malloc/Makefile
index d0f23f7bf3..b7d4c63920 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -26,7 +26,7 @@ dist-headers := malloc.h
 headers := $(dist-headers) obstack.h mcheck.h
 tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
 	 tst-mcheck tst-mallocfork tst-trim1 \
-	 tst-malloc-usable tst-realloc tst-posix_memalign \
+	 tst-malloc-usable tst-realloc tst-reallocarray tst-posix_memalign \
 	 tst-pvalloc tst-memalign tst-mallopt \
 	 tst-malloc-backtrace tst-malloc-thread-exit \
 	 tst-malloc-thread-fail tst-malloc-fork-deadlock \
@@ -49,7 +49,7 @@ endif
 tests += $(tests-static)
 test-srcs = tst-mtrace
 
-routines = malloc morecore mcheck mtrace obstack \
+routines = malloc morecore mcheck mtrace obstack reallocarray \
   scratch_buffer_grow scratch_buffer_grow_preserve \
   scratch_buffer_set_array_size
 
diff --git a/malloc/Versions b/malloc/Versions
index e34ab177be..23aafb5ccc 100644
--- a/malloc/Versions
+++ b/malloc/Versions
@@ -62,6 +62,7 @@ libc {
     aligned_alloc;
   }
   GLIBC_2.26 {
+    reallocarray;
   }
   GLIBC_PRIVATE {
     # Internal startup hook for libpthread.
@@ -74,5 +75,8 @@ libc {
     __libc_scratch_buffer_grow;
     __libc_scratch_buffer_grow_preserve;
     __libc_scratch_buffer_set_array_size;
+
+    # Internal name for reallocarray
+    __libc_reallocarray;
   }
 }
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index de6103d7e1..dbd801a58e 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -81,5 +81,24 @@ void __malloc_fork_unlock_parent (void) internal_function attribute_hidden;
 /* Called in the child process after a fork.  */
 void __malloc_fork_unlock_child (void) internal_function attribute_hidden;
 
+/* Set *RESULT to LEFT * RIGHT.  Return true if the multiplication
+   overflowed.  */
+static inline bool
+check_mul_overflow_size_t (size_t left, size_t right, size_t *result)
+{
+#if __GNUC__ >= 5
+  return __builtin_mul_overflow (left, right, result);
+#else
+  /* size_t is unsigned so the behavior on overflow is defined.  */
+  *result = left * right;
+  size_t half_size_t = ((size_t) 1) << (8 * sizeof (size_t) / 2);
+  if (__glibc_unlikely ((left | right) >= half_size_t))
+    {
+      if (__glibc_unlikely (right != 0 && *result / right != left))
+        return true;
+    }
+  return false;
+#endif
+}
 
 #endif /* _MALLOC_INTERNAL_H */
diff --git a/malloc/malloc.h b/malloc/malloc.h
index 274c0958e4..339ab64c7d 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -49,6 +49,14 @@ __THROW __attribute_malloc__ __wur;
 extern void *realloc (void *__ptr, size_t __size)
 __THROW __attribute_warn_unused_result__;
 
+/* Re-allocate the previously allocated block in PTR, making the new
+   block large enough for NMEMB elements of SIZE bytes each.  */
+/* __attribute_malloc__ is not used, because if reallocarray returns
+   the same pointer that was passed to it, aliasing needs to be allowed
+   between objects pointed by the old and new pointers.  */
+extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
+__THROW __attribute_warn_unused_result__;
+
 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 extern void free (void *__ptr) __THROW;
 
diff --git a/malloc/reallocarray.c b/malloc/reallocarray.c
new file mode 100644
index 0000000000..07562c30c9
--- /dev/null
+++ b/malloc/reallocarray.c
@@ -0,0 +1,37 @@
+/* Change the size of an allocated block.
+   Copyright (C) 2017 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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <malloc.h>
+#include <malloc/malloc-internal.h>
+
+void *
+__libc_reallocarray (void *optr, size_t nmemb, size_t elem_size)
+{
+  size_t bytes;
+  if (check_mul_overflow_size_t (nmemb, elem_size, &bytes))
+    {
+      __set_errno (ENOMEM);
+      return 0;
+    }
+  else
+    return realloc (optr, bytes);
+}
+libc_hidden_def (__libc_reallocarray)
+
+weak_alias (__libc_reallocarray, reallocarray)
diff --git a/malloc/tst-reallocarray.c b/malloc/tst-reallocarray.c
new file mode 100644
index 0000000000..f1cbf7fe0a
--- /dev/null
+++ b/malloc/tst-reallocarray.c
@@ -0,0 +1,118 @@
+/* Test for reallocarray.
+   Copyright (C) 2017 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <malloc.h>
+#include <string.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  void *ptr = NULL;
+  void *ptr2 = NULL;
+  unsigned char *c;
+  size_t i;
+  int ok;
+  const size_t max = ~(size_t)0;
+  size_t a, b;
+
+  /* Test overflow detection.  */
+  errno = 0;
+  ptr = reallocarray (NULL, max, 2);
+  TEST_VERIFY (!ptr);
+  TEST_VERIFY (errno == ENOMEM);
+
+  errno = 0;
+  ptr = reallocarray (NULL, 2, max);
+  TEST_VERIFY (!ptr);
+  TEST_VERIFY (errno == ENOMEM);
+
+  a = 65537;
+  b = max/65537 + 1;
+  errno = 0;
+  ptr = reallocarray (NULL, a, b);
+  TEST_VERIFY (!ptr);
+  TEST_VERIFY (errno == ENOMEM);
+
+  errno = 0;
+  ptr = reallocarray (NULL, b, a);
+  TEST_VERIFY (!ptr);
+  TEST_VERIFY (errno == ENOMEM);
+
+  /* Test realloc-like behavior.  */
+  /* Allocate memory like malloc.  */
+  ptr = reallocarray (NULL, 10, 2);
+  TEST_VERIFY_EXIT (ptr);
+  TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 10*2);
+
+  memset (ptr, 0xAF, 10*2);
+
+  /* Enlarge buffer.   */
+  ptr2 = reallocarray (ptr, 20, 2);
+  TEST_VERIFY (ptr2);
+  if (ptr2)
+    ptr = ptr2;
+  TEST_VERIFY (malloc_usable_size (ptr) >= 20*2);
+
+  c = ptr;
+  ok = 1;
+  for (i = 0; i < 10*2; ++i)
+    {
+      if (c[i] != 0xAF)
+        ok = 0;
+    }
+  TEST_VERIFY (ok);
+
+  /* Decrease buffer size.  */
+  ptr2 = reallocarray (ptr, 5, 3);
+  TEST_VERIFY (ptr2);
+  if (ptr2)
+    ptr = ptr2;
+  TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 5*3);
+
+  c = ptr;
+  ok = 1;
+  for (i = 0; i < 5*3; ++i)
+    {
+      if (c[i] != 0xAF)
+        ok = 0;
+    }
+  TEST_VERIFY (ok);
+
+  /* Overflow should leave buffer untouched.  */
+  errno = 0;
+  ptr2 = reallocarray (ptr, 2, ~(size_t)0);
+  TEST_VERIFY (!ptr2);
+  TEST_VERIFY (errno == ENOMEM);
+
+  c = ptr;
+  ok = 1;
+  for (i = 0; i < 5*3; ++i)
+    {
+      if (c[i] != 0xAF)
+        ok = 0;
+    }
+  TEST_VERIFY (ok);
+
+  free (ptr);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/manual/memory.texi b/manual/memory.texi
index a256ca07b2..fb6b594ef1 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -751,8 +751,8 @@ be a buffer that you use to hold a line being read from a file; no matter
 how long you make the buffer initially, you may encounter a line that is
 longer.
 
-You can make the block longer by calling @code{realloc}.  This function
-is declared in @file{stdlib.h}.
+You can make the block longer by calling @code{realloc} or
+@code{reallocarray}.  These functions are declared in @file{stdlib.h}.
 @pindex stdlib.h
 
 @comment malloc.h stdlib.h
@@ -816,9 +816,29 @@ behavior, and will probably crash when @code{realloc} is passed a null
 pointer.
 @end deftypefun
 
-Like @code{malloc}, @code{realloc} may return a null pointer if no
-memory space is available to make the block bigger.  When this happens,
-the original block is untouched; it has not been modified or relocated.
+@comment malloc.h stdlib.h
+@comment BSD
+@deftypefun {void *} reallocarray (void *@var{ptr}, size_t @var{nmemb}, size_t @var{size})
+@safety{@prelim{}@mtsafe{}@asunsafe{@asulock{}}@acunsafe{@aculock{} @acsfd{} @acsmem{}}}
+
+The @code{reallocarray} function changes the size of the block whose address
+is @var{ptr} to be long enough to contain a vector of @var{nmemb} elements,
+each of size @var{size}.  It is equivalent to @samp{realloc (@var{ptr},
+@var{nmemb} * @var{size})}, except that @code{reallocarray} fails safely if
+the multiplication overflows, by setting @code{errno} to @code{ENOMEM},
+returning a null pointer, and leaving the original block unchanged.
+
+@code{reallocarray} should be used instead of @code{realloc} when the new size
+of the allocated block is the result of a multiplication that might overflow.
+
+@strong{Portability Note:} This function is not part of any standard.  It was
+first introduced in OpenBSD 5.6.
+@end deftypefun
+
+Like @code{malloc}, @code{realloc} and @code{reallocarray} may return a null
+pointer if no memory space is available to make the block bigger.  When this
+happens, the original block is untouched; it has not been modified or
+relocated.
 
 In most cases it makes no difference what happens to the original block
 when @code{realloc} fails, because the application program cannot continue
@@ -838,16 +858,17 @@ xrealloc (void *ptr, size_t size)
 @}
 @end smallexample
 
-You can also use @code{realloc} to make a block smaller.  The reason you
-would do this is to avoid tying up a lot of memory space when only a little
-is needed.
+You can also use @code{realloc} or @code{reallocarray} to make a block
+smaller.  The reason you would do this is to avoid tying up a lot of memory
+space when only a little is needed.
 @comment The following is no longer true with the new malloc.
 @comment But it seems wise to keep the warning for other implementations.
 In several allocation implementations, making a block smaller sometimes
 necessitates copying it, so it can fail if no other space is available.
 
-If the new size you specify is the same as the old size, @code{realloc}
-is guaranteed to change nothing and return the same address that you gave.
+If the new size you specify is the same as the old size, @code{realloc} and
+@code{reallocarray} are guaranteed to change nothing and return the same
+address that you gave.
 
 @node Allocating Cleared Space
 @subsubsection Allocating Cleared Space
@@ -1588,6 +1609,11 @@ Malloc}.
 Make a block previously allocated by @code{malloc} larger or smaller,
 possibly by copying it to a new location.  @xref{Changing Block Size}.
 
+@item void *reallocarray (void *@var{ptr}, size_t @var{nmemb}, size_t @var{size})
+Change the size of a block previously allocated by @code{malloc} to
+@code{@var{nmemb} * @var{size}} bytes as with @code{realloc}.  @xref{Changing
+Block Size}.
+
 @item void *calloc (size_t @var{count}, size_t @var{eltsize})
 Allocate a block of @var{count} * @var{eltsize} bytes using
 @code{malloc}, and set its contents to zero.  @xref{Allocating Cleared
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index 99125f2d23..428ca2ef68 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -422,6 +422,17 @@ extern void *calloc (size_t __nmemb, size_t __size)
    between objects pointed by the old and new pointers.  */
 extern void *realloc (void *__ptr, size_t __size)
      __THROW __attribute_warn_unused_result__;
+
+#ifdef __USE_GNU
+/* Re-allocate the previously allocated block in PTR, making the new
+   block large enough for NMEMB elements of SIZE bytes each.  */
+/* __attribute_malloc__ is not used, because if reallocarray returns
+   the same pointer that was passed to it, aliasing needs to be allowed
+   between objects pointed by the old and new pointers.  */
+extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
+     __THROW __attribute_warn_unused_result__;
+#endif
+
 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 extern void free (void *__ptr) __THROW;
 
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 58d768c6bc..a494c3947d 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2097,3 +2097,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 906050d2c3..2fc1a9bae7 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2008,6 +2008,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
index 66112dd0a7..4465a62ff1 100644
--- a/sysdeps/unix/sysv/linux/arm/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
@@ -98,6 +98,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.4 GLIBC_2.4 A
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 3ddadd2a24..96126d9e6a 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -1862,6 +1862,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 977ab90bc7..aae351bbff 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2020,6 +2020,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index c7edb9a272..81ec65bec0 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -1884,6 +1884,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 450be4e9c1..9db205b68e 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -99,6 +99,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.4 GLIBC_2.4 A
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 9e016bd76e..ee59e950b6 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -1976,6 +1976,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
index 1a455be0f5..feb869757c 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
@@ -2097,3 +2097,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index 8eb5e668b9..a5b1c42929 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -1951,6 +1951,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index 416d9ac0ae..570a859aac 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -1949,6 +1949,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index f4949e5a38..71008ad873 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -1947,6 +1947,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index c7375aee3f..1a07d66caf 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -1942,6 +1942,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index 724a0e3a04..a62a41be62 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2138,3 +2138,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index 2dc32b631c..f4f11dc625 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -1980,6 +1980,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index 5658109ca2..2977569f2c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -1985,6 +1985,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
index c761221ffe..271d32e19b 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
@@ -2185,3 +2185,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
index 265c76914b..372ef67c27 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
@@ -99,6 +99,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 _Exit F
 GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index ed1b6bf26f..705ff851a9 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -1980,6 +1980,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index 2e75d29e47..21fd2b5671 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -1881,6 +1881,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
index bd74c0cdab..313a71e589 100644
--- a/sysdeps/unix/sysv/linux/sh/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
@@ -1866,6 +1866,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 5584838409..94a4fb2213 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -1972,6 +1972,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index efedbe2874..6db5811c3f 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -1910,6 +1910,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
index ffd988a33d..5d83926aac 100644
--- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
@@ -2104,3 +2104,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
index f0c13ceea8..ce14ceb15f 100644
--- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
@@ -2104,3 +2104,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
index ffd988a33d..5d83926aac 100644
--- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
@@ -2104,3 +2104,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index f57004c860..f69de7aa83 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -1861,6 +1861,8 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F
 GLIBC_2.3 GLIBC_2.3 A
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 05629e17e7..a330855308 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2104,3 +2104,5 @@ GLIBC_2.25 getrandom F
 GLIBC_2.25 strfromd F
 GLIBC_2.25 strfromf F
 GLIBC_2.25 strfroml F
+GLIBC_2.26 GLIBC_2.26 A
+GLIBC_2.26 reallocarray F