Fix nasty /proc vulnerability

We have a bad interaction with both the kernel and user space being able
to change some of the /proc file status.  This fixes the most obvious
part of it, but I expect we'll also make it harder for users to modify
even their "own" files in /proc.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 243a94af042..0cb8f20d000 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1338,6 +1338,7 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
 		} else {
 			inode->i_uid = 0;
 			inode->i_gid = 0;
+			inode->i_mode = 0;
 		}
 		security_task_to_inode(task, inode);
 		put_task_struct(task);