proc: save 2 atomic ops on write to "/proc/*/attr/*"

Code checks if write is done by current to its own attributes.
For that get/put pair is unnecessary as it can be done under RCU.

Note: rcu_read_unlock() can be done even earlier since pointer to a task
is not dereferenced. It depends if /proc code should look scary or not:

	rcu_read_lock();
	task = pid_task(...);
	rcu_read_unlock();
	if (!task)
		return -ESRCH;
	if (task != current)
		return -EACCESS:

P.S.: rename "length" variable.	Code like this

	length = -EINVAL;

should not exist.

Link: http://lkml.kernel.org/r/20180627200218.GF18113@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 912a030..4d8dac6 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2517,47 +2517,47 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
                                   size_t count, loff_t *ppos)
 {
        struct inode * inode = file_inode(file);
+       struct task_struct *task;
        void *page;
-       ssize_t length;
-       struct task_struct *task = get_proc_task(inode);
-
-       length = -ESRCH;
-       if (!task)
-               goto out_no_task;
+       int rv;
 
+       rcu_read_lock();
+       task = pid_task(proc_pid(inode), PIDTYPE_PID);
+       if (!task) {
+               rcu_read_unlock();
+               return -ESRCH;
+       }
        /* A task may only write its own attributes. */
-       length = -EACCES;
-       if (current != task)
-               goto out;
+       if (current != task) {
+               rcu_read_unlock();
+               return -EACCES;
+       }
+       rcu_read_unlock();
 
        if (count > PAGE_SIZE)
                count = PAGE_SIZE;
 
        /* No partial writes. */
-       length = -EINVAL;
        if (*ppos != 0)
-               goto out;
+               return -EINVAL;
 
        page = memdup_user(buf, count);
        if (IS_ERR(page)) {
-               length = PTR_ERR(page);
+               rv = PTR_ERR(page);
                goto out;
        }
 
        /* Guard against adverse ptrace interaction */
-       length = mutex_lock_interruptible(&current->signal->cred_guard_mutex);
-       if (length < 0)
+       rv = mutex_lock_interruptible(&current->signal->cred_guard_mutex);
+       if (rv < 0)
                goto out_free;
 
-       length = security_setprocattr(file->f_path.dentry->d_name.name,
-                                     page, count);
+       rv = security_setprocattr(file->f_path.dentry->d_name.name, page, count);
        mutex_unlock(&current->signal->cred_guard_mutex);
 out_free:
        kfree(page);
 out:
-       put_task_struct(task);
-out_no_task:
-       return length;
+       return rv;
 }
 
 static const struct file_operations proc_pid_attr_operations = {