diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 8e7e61b28f31..988c5a77e888 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2488,6 +2488,12 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, length = -ESRCH; if (!task) goto out_no_task; + + /* A task may only write its own attributes. */ + length = -EACCES; + if (current != task) + goto out; + if (count > PAGE_SIZE) count = PAGE_SIZE; @@ -2503,14 +2509,13 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, } /* Guard against adverse ptrace interaction */ - length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); + length = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); if (length < 0) goto out_free; - length = security_setprocattr(task, - (char*)file->f_path.dentry->d_name.name, + length = security_setprocattr(file->f_path.dentry->d_name.name, page, count); - mutex_unlock(&task->signal->cred_guard_mutex); + mutex_unlock(¤t->signal->cred_guard_mutex); out_free: kfree(page); out: |