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authorFlorian Weimer <fweimer@redhat.com>2020-02-08 19:58:43 +0100
committerFlorian Weimer <fweimer@redhat.com>2020-02-15 11:01:23 +0100
commit3a0ecccb599a6b1ad4b149dc569c0080e92d057b (patch)
treee1c4c0e5f2e80221054d6bb6260b4038e27567b4 /sysdeps/generic/localplt.data
parent2efa52c880d46ee89523c8ed8102ceeb02043926 (diff)
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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>
Diffstat (limited to 'sysdeps/generic/localplt.data')
-rw-r--r--sysdeps/generic/localplt.data6
1 files changed, 0 insertions, 6 deletions
diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data
index 2d5c66ae28..e2083c0ce6 100644
--- a/sysdeps/generic/localplt.data
+++ b/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