Implement allocation buffers for internal use

This commit adds fixed-size allocation buffers.  The primary use
case is in NSS modules, where dynamically sized data is stored
in a fixed-size buffer provided by the caller.

Other uses include a replacement of mempcpy cascades (which is
safer due to the size checking inherent to allocation buffers).

1 files changed, 7 insertions, 1 deletions

diff --git a/malloc/Versions b/malloc/Versions
index 5b543069b3..2357cff3da 100644
--- a/malloc/Versions
+++ b/malloc/Versions
@@ -76,7 +76,6 @@ libc {
     __libc_scratch_buffer_grow_preserve;
     __libc_scratch_buffer_set_array_size;
 
-
     # Internal name for reallocarray
     __libc_reallocarray;
 
@@ -86,5 +85,12 @@ libc {
     __libc_dynarray_finalize;
     __libc_dynarray_resize;
     __libc_dynarray_resize_clear;
+
+    # struct alloc_buffer support
+    __libc_alloc_buffer_alloc_array;
+    __libc_alloc_buffer_allocate;
+    __libc_alloc_buffer_copy_bytes;
+    __libc_alloc_buffer_copy_string;
+    __libc_alloc_buffer_create_failure;
   }
 }