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 f0b2132b35248c1f4a80f62a2c38cddcc802aa8c
("ld.so: Support moving versioned symbols between sonames
[BZ #24741]").

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

1 files changed, 0 insertions, 3 deletions

diff --git a/elf/Versions b/elf/Versions
index 3b09901f6c..705489fc51 100644
--- a/elf/Versions
+++ b/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 {