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Remove malloc hooks [BZ #23328]

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Make malloc hooks symbols compat-only so that new applications cannot
link against them and remove the declarations from the API.  Also
remove the unused malloc-hooks.h.

Finally, mark all symbols in libc_malloc_debug.so as compat so that
the library cannot be linked against.

Add a note about the deprecation in NEWS.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Siddhesh Poyarekar
2021-07-22 18:38:12 +05:30
parent 0552fd2c7d
commit 1e5a5866cb
6 changed files with 57 additions and 226 deletions
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36
malloc/malloc-debug.c
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@ -23,6 +23,7 @@
#include <unistd.h>
#include <sys/param.h>
#if SHLIB_COMPAT (libc_malloc_debug, GLIBC_2_0, GLIBC_2_34)
/* Support only the glibc allocators. */
extern void *__libc_malloc (size_t);
extern void __libc_free (void *);
@ -76,9 +77,11 @@ __malloc_debug_disable (enum malloc_debug_hooks flag)
#include "mtrace.c"
#include "malloc-check.c"
#if SHLIB_COMPAT (libc_malloc_debug, GLIBC_2_0, GLIBC_2_24)
extern void (*__malloc_initialize_hook) (void);
compat_symbol_reference (libc, __malloc_initialize_hook,
__malloc_initialize_hook, GLIBC_2_0);
#endif
static void *malloc_hook_ini (size_t, const void *) __THROW;
static void *realloc_hook_ini (void *, size_t, const void *) __THROW;
@ -115,9 +118,11 @@ generic_hook_ini (void)
will not try to optimize it away. */
__libc_free (__libc_malloc (0));
#if SHLIB_COMPAT (libc_malloc_debug, GLIBC_2_0, GLIBC_2_24)
void (*hook) (void) = __malloc_initialize_hook;
if (hook != NULL)
(*hook)();
#endif
debug_initialized = 1;
}
@ -631,3 +636,34 @@ malloc_set_state (void *msptr)
compat_symbol (libc_malloc_debug, malloc_set_state, malloc_set_state,
GLIBC_2_0);
#endif
/* Do not allow linking against the library. */
compat_symbol (libc_malloc_debug, aligned_alloc, aligned_alloc, GLIBC_2_16);
compat_symbol (libc_malloc_debug, calloc, calloc, GLIBC_2_0);
compat_symbol (libc_malloc_debug, free, free, GLIBC_2_0);
compat_symbol (libc_malloc_debug, mallinfo2, mallinfo2, GLIBC_2_33);
compat_symbol (libc_malloc_debug, mallinfo, mallinfo, GLIBC_2_0);
compat_symbol (libc_malloc_debug, malloc_info, malloc_info, GLIBC_2_10);
compat_symbol (libc_malloc_debug, malloc, malloc, GLIBC_2_0);
compat_symbol (libc_malloc_debug, malloc_stats, malloc_stats, GLIBC_2_0);
compat_symbol (libc_malloc_debug, malloc_trim, malloc_trim, GLIBC_2_0);
compat_symbol (libc_malloc_debug, malloc_usable_size, malloc_usable_size,
GLIBC_2_0);
compat_symbol (libc_malloc_debug, mallopt, mallopt, GLIBC_2_0);
compat_symbol (libc_malloc_debug, mcheck_check_all, mcheck_check_all,
GLIBC_2_2);
compat_symbol (libc_malloc_debug, mcheck, mcheck, GLIBC_2_0);
compat_symbol (libc_malloc_debug, mcheck_pedantic, mcheck_pedantic, GLIBC_2_2);
compat_symbol (libc_malloc_debug, memalign, memalign, GLIBC_2_0);
compat_symbol (libc_malloc_debug, mprobe, mprobe, GLIBC_2_0);
compat_symbol (libc_malloc_debug, mtrace, mtrace, GLIBC_2_0);
compat_symbol (libc_malloc_debug, muntrace, muntrace, GLIBC_2_0);
compat_symbol (libc_malloc_debug, posix_memalign, posix_memalign, GLIBC_2_2);
compat_symbol (libc_malloc_debug, pvalloc, pvalloc, GLIBC_2_0);
compat_symbol (libc_malloc_debug, realloc, realloc, GLIBC_2_0);
compat_symbol (libc_malloc_debug, valloc, valloc, GLIBC_2_0);
compat_symbol (libc_malloc_debug, __free_hook, __free_hook, GLIBC_2_0);
compat_symbol (libc_malloc_debug, __malloc_hook, __malloc_hook, GLIBC_2_0);
compat_symbol (libc_malloc_debug, __realloc_hook, __realloc_hook, GLIBC_2_0);
compat_symbol (libc_malloc_debug, __memalign_hook, __memalign_hook, GLIBC_2_0);
#endif