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 <elena.reshetova@xxxxxxxxx>
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@xxxxxxxxx
Signed-off-by: Elena Reshetova <elena.reshetova@xxxxxxxxx>
Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: David Windsor <dwindsor@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Serge Hallyn <serge@xxxxxxxxxx>
Cc: <arozansk@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx are
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