diff options
| -rw-r--r-- | fs/proc/base.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index bd8c26a409a7..2166f24af37e 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2413,6 +2413,10 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, ssize_t length; struct task_struct *task = get_proc_task(inode); + /* A task may only write when it was the opener. */ + if (file->f_cred != current_real_cred()) + return -EPERM; + length = -ESRCH; if (!task) goto out_no_task; |