* Tony Jones ([email protected]) wrote:
> The discussion about composing with commoncap made me think about whether
> this is the best way to do this. It seems that we're heading towards a
> requirement that every module internally compose with commoncap.
Not a requirement, it's a choice ATM.
> If so (apart from the obvious correctness issues when they don't) it's work
> for each module and composing N of them under stacker obviously creates
> overhead.
>
> Would the following not be a better approach?
>
> static inline int security_ptrace (struct task_struct * parent, struct task_struct * child)
> {
> int ret;
> ret=cap_ptrace (parent, child);
> #ifdef CONFIG_SECURITY
> if (!ret && security_ops->ptrace)
> ret=security_ops->ptrace(parent, child);
> #endif
> return ret;
> }
Heh, this was next on my list. I just wanted to separate the changes to
one at a time so we can easily measure the impact. This becomes another
policy shift.
> If every module is already internally composing, there shouldn't be a
> performance cost for the additional branch inside the #ifdef.
This needs measurement to verify.
> I havn't looked at every single hook and it's users to see if this would
> cause a problem. I noticed SELinux calls sec->capget() post rather than pre
> it's processing which may be an issue.
Yes, that need careful inspection.
thanks,
-chris
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |