diff options
| author | Florian Weimer <fweimer@redhat.com> | 2020-02-08 19:58:43 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2020-02-15 11:01:23 +0100 |
| commit | 3a0ecccb599a6b1ad4b149dc569c0080e92d057b (patch) | |
| tree | e1c4c0e5f2e80221054d6bb6260b4038e27567b4 /sysdeps/x86_64 | |
| parent | 2efa52c880d46ee89523c8ed8102ceeb02043926 (diff) | |
| download | glibc-3a0ecccb599a6b1ad4b149dc569c0080e92d057b.tar.gz glibc-3a0ecccb599a6b1ad4b149dc569c0080e92d057b.tar.xz glibc-3a0ecccb599a6b1ad4b149dc569c0080e92d057b.zip | |
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/x86_64')
| -rw-r--r-- | sysdeps/x86_64/localplt.data | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data index c27a02b66a..8f41e92870 100644 --- a/sysdeps/x86_64/localplt.data +++ b/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 |