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ARM: warn about atexit() calls from legacy shared libraries

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Legacy ARM shared libraries use this generic version of atexit(),
which queues exit functions for invocation at program exit, at
which time the library may have been dlclose()'d, causing the
program to crash.

Change-Id: I41ae153c23268daa65ede7fb8966fc3e9caec369
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@gmail.com>
This commit is contained in:
Ard Biesheuvel 2012-08-28 11:23:06 +02:00
parent f3cfcd869d
commit 144c291866
1 changed files with 14 additions and 0 deletions
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14
libc/arch-arm/bionic/atexit_legacy.c
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@ -27,6 +27,8 @@
*/
#include <sys/types.h>
#include <private/logd.h>
#include <stdio.h>
/*
* This source file should only be included by libc.so, its purpose is
@ -42,5 +44,17 @@ extern int __cxa_atexit(void (*func)(void *), void *arg, void *dso);
int
atexit(void (*func)(void))
{
/*
* Exit functions queued by this version of atexit will not be called
* on dlclose(), and when they are called (at program exit), the
* calling library may have been dlclose()'d, causing the program to
* crash.
*/
static char const warning[] =
"WARNING: generic atexit() called from legacy shared library\n";
__libc_android_log_print(ANDROID_LOG_WARN, "libc", warning);
fprintf(stderr, warning);
return (__cxa_atexit((void (*)(void *))func, NULL, NULL));
}