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malloc: Use compat_symbol_reference in libmcheck [BZ #22050]

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Since glibc 2.24, __malloc_initialize_hook is a compat symbol.  As a
result, the link editor does not export a definition of
__malloc_initialize_hook from the main program, so that it no longer
interposes the variable definition in libc.so.  Specifying the symbol
version restores the exported symbol.
This commit is contained in:
Florian Weimer 2017-10-16 20:52:34 +02:00
parent d8287b36ab
commit 7ece6cd509
2 changed files with 9 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2017-10-16 Florian Weimer <fweimer@redhat.com>
[BZ #22050]
* malloc/mcheck-init.c (__malloc_initialize_hook): Use
compat_symbol_reference to access non-default version.
2017-10-16 Florian Weimer <fweimer@redhat.com>
* malloc/Makefile (others-extras): Set to mcheck-init.o.

3
malloc/mcheck-init.c
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@ -20,6 +20,7 @@
#include <malloc.h>
#include <mcheck.h>
#include <shlib-compat.h>
static void
turn_on_mcheck (void)
@ -28,3 +29,5 @@ turn_on_mcheck (void)
}
void (*__malloc_initialize_hook) (void) = turn_on_mcheck;
compat_symbol_reference (libc, __malloc_initialize_hook,
__malloc_initialize_hook, GLIBC_2_0);