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ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486]

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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 f0b2132b35
("ld.so: Support moving versioned symbols between sonames
[BZ #24741]").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-02-08 19:58:43 +01:00
parent 2efa52c880
commit 3a0ecccb59
60 changed files with 202 additions and 266 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist
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@@ -1,8 +1,4 @@
GLIBC_2.0 _r_debug D 0x14
GLIBC_2.0 calloc F
GLIBC_2.0 free F
GLIBC_2.0 malloc F
GLIBC_2.0 realloc F
GLIBC_2.1 __libc_stack_end D 0x4
GLIBC_2.1 _dl_mcount F
GLIBC_2.3 __tls_get_addr F

6
sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
View File

@@ -19,12 +19,6 @@ 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

4
sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist
View File

@@ -1,8 +1,4 @@
GLIBC_2.2 __libc_stack_end D 0x8
GLIBC_2.2 _dl_mcount F
GLIBC_2.2 _r_debug D 0x28
GLIBC_2.2 calloc F
GLIBC_2.2 free F
GLIBC_2.2 malloc F
GLIBC_2.2 realloc F
GLIBC_2.3 __tls_get_addr F

6
sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
View File

@@ -18,12 +18,6 @@ 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