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Fix nasty /proc vulnerability
author
Linus Torvalds
<torvalds@g5.osdl.org>
Fri, 14 Jul 2006 23:51:34 +0000
(16:51 -0700)
committer
Linus Torvalds
<torvalds@g5.osdl.org>
Fri, 14 Jul 2006 23:51:34 +0000
(16:51 -0700)
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>
fs/proc/base.c
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diff --git
a/fs/proc/base.c
b/fs/proc/base.c
index
243a94a
..
0cb8f20
100644
(file)
--- 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);