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SubjectRe: [PATCH 5/5] Swap Migration V5: sys_migrate_pages interface
Christoph Lameter <clameter@sgi.com> wrote:
>
> ...
> Changes V3->V4:
> - Add Ray's permissions check based on check_kill_permission().
>
> ...
> + /*
> + * Permissions check like for signals.
> + * See check_kill_permission()
> + */
> + if ((current->euid ^ task->suid) && (current->euid ^ task->uid) &&
> + (current->uid ^ task->suid) && (current->uid ^ task->uid) &&
> + !capable(CAP_SYS_ADMIN)) {
> + err = -EPERM;
> + goto out;
> + }

Obscure. Can you please explain the thinking behind putting this check in
here? Preferably via a comment...
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