From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: [merged] ipc-convert-sem_undo_listrefcnt-from-atomic_t-to-refcount_t.patch removed from -mm tree Date: Mon, 11 Sep 2017 12:44:13 -0700 Message-ID: <20170911194413.Ogi6au0bs%akpm@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50916 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751151AbdIKToO (ORCPT ); Mon, 11 Sep 2017 15:44:14 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: adobriyan@gmail.com, arozansk@redhat.com, dave@stgolabs.net, dwindsor@gmail.com, ebiederm@xmission.com, elena.reshetova@intel.com, gregkh@linuxfoundation.org, ishkamiel@gmail.com, keescook@chromium.org, manfred@colorfullife.com, mingo@redhat.com, mm-commits@vger.kernel.org, peterz@infradead.org, serge@hallyn.com The patch titled Subject: ipc: convert sem_undo_list.refcnt from atomic_t to refcount_t has been removed from the -mm tree. Its filename was ipc-convert-sem_undo_listrefcnt-from-atomic_t-to-refcount_t.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Elena Reshetova Subject: ipc: convert sem_undo_list.refcnt from atomic_t to refcount_t refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Link: http://lkml.kernel.org/r/1499417992-3238-3-git-send-email-elena.reshetova@intel.com Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor Cc: Peter Zijlstra Cc: Greg Kroah-Hartman Cc: "Eric W. Biederman" Cc: Ingo Molnar Cc: Alexey Dobriyan Cc: Serge Hallyn Cc: Cc: Davidlohr Bueso Cc: Manfred Spraul Signed-off-by: Andrew Morton --- ipc/sem.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff -puN ipc/sem.c~ipc-convert-sem_undo_listrefcnt-from-atomic_t-to-refcount_t ipc/sem.c --- a/ipc/sem.c~ipc-convert-sem_undo_listrefcnt-from-atomic_t-to-refcount_t +++ a/ipc/sem.c @@ -122,7 +122,7 @@ struct sem_undo { * that may be shared among all a CLONE_SYSVSEM task group. */ struct sem_undo_list { - atomic_t refcnt; + refcount_t refcnt; spinlock_t lock; struct list_head list_proc; }; @@ -1642,7 +1642,7 @@ static inline int get_undo_list(struct s if (undo_list == NULL) return -ENOMEM; spin_lock_init(&undo_list->lock); - atomic_set(&undo_list->refcnt, 1); + refcount_set(&undo_list->refcnt, 1); INIT_LIST_HEAD(&undo_list->list_proc); current->sysvsem.undo_list = undo_list; @@ -2041,7 +2041,7 @@ int copy_semundo(unsigned long clone_fla error = get_undo_list(&undo_list); if (error) return error; - atomic_inc(&undo_list->refcnt); + refcount_inc(&undo_list->refcnt); tsk->sysvsem.undo_list = undo_list; } else tsk->sysvsem.undo_list = NULL; @@ -2070,7 +2070,7 @@ void exit_sem(struct task_struct *tsk) return; tsk->sysvsem.undo_list = NULL; - if (!atomic_dec_and_test(&ulp->refcnt)) + if (!refcount_dec_and_test(&ulp->refcnt)) return; for (;;) { _ Patches currently in -mm which might be from elena.reshetova@intel.com are