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>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 243a94a..0cb8f20 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1338,6 +1338,7 @@
} else {
inode->i_uid = 0;
inode->i_gid = 0;
+ inode->i_mode = 0;
}
security_task_to_inode(task, inode);
put_task_struct(task);