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agp: remove uid comparison as security check 

In the face of containers and user namespaces, a uid==0 check for
security is not safe.  Switch to a capability check.

I'm not sure I picked the right capability, but this being AGP
CAP_SYS_RAWIO seemed to make sense.

Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
serue@us.ibm.com 2007-12-05 13:55:36 -08:00 committed by Dave Airlie
parent 1fa4db7d30
commit 62f29babbc
1 changed files with 1 additions and 1 deletions
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2
drivers/char/agp/frontend.c
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@ -689,7 +689,7 @@ static int agp_open(struct inode *inode, struct file *file)
set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
priv->my_pid = current->pid;
if ((current->uid == 0) || (current->suid == 0)) {
if (capable(CAP_SYS_RAWIO)) {
/* Root priv, can be controller */
set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
}