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-rw-r--r--fs/proc/base.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3851bfcdba56..58bbf334265b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2703,6 +2703,10 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
void *page;
int rv;
+ /* A task may only write when it was the opener. */
+ if (file->f_cred != current_real_cred())
+ return -EPERM;
+
rcu_read_lock();
task = pid_task(proc_pid(inode), PIDTYPE_PID);
if (!task) {