diff options
| author | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-01-03 19:44:54 +0100 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-01-06 23:54:38 +0100 |
| commit | d41cec56d5c04d88aa2d06986b692cd1fa279748 (patch) | |
| tree | 0ae2816dabaff91329d1e51f1f234fc8ead55174 /libc/stdlib | |
| parent | 7b495396fbf7bf604939d8150955ce891f7e8ccd (diff) | |
pthread_atfork handlers not removed during dlclose
Invoke pthread_atfork handler cleanup when removing the associated DSO...
If a program loads a DSO (dlopen) that sets up a pthread_atfork handler(s), and
then subsequently closes the DSO, the handler(s) are left in place. If fork()
is subsequently called, the handlers are invoked even though the DSO has been
removed causing crashes or unpredictable code execution. This is because the
code in __cxa_finalize(atexit.c)to invoke the unregister_atfork() routine is
ifdef'd out with the comment that it hasn't been "looked into this yet...".
Refs.:
http://bugs.busybox.net/show_bug.cgi?id=8211
http://sourceware.org/bugzilla/show_bug.cgi?id=13502
Add test-case, enable cleanup for NPTL only.
Signed-off-by: John Ata <john.ata@baesystems.com>
Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Diffstat (limited to 'libc/stdlib')
| -rw-r--r-- | libc/stdlib/_atexit.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/libc/stdlib/_atexit.c b/libc/stdlib/_atexit.c index 3faa9f05f..8a3196781 100644 --- a/libc/stdlib/_atexit.c +++ b/libc/stdlib/_atexit.c @@ -43,6 +43,9 @@ #include <stdio.h> #include <errno.h> #include <atomic.h> +#if defined __UCLIBC_HAS_THREADS__ && defined __UCLIBC_HAS_THREADS_NATIVE__ +# include <fork.h> +#endif #include <bits/uClibc_mutex.h> __UCLIBC_MUTEX_EXTERN(__atexit_lock) attribute_hidden; @@ -208,17 +211,15 @@ void __cxa_finalize(void *dso_handle) } } -#if 0 /* haven't looked into this yet... */ /* * Remove the registered fork handlers. We do not have to * unregister anything if the program is going to terminate anyway. */ #ifdef UNREGISTER_ATFORK - if (d != NULL) { - UNREGISTER_ATFORK(d); + if (dso_handle != NULL) { + UNREGISTER_ATFORK(dso_handle); } #endif -#endif } #endif |