selinux: Fix send_sigiotask hook
The CRED patch incorrectly converted the SELinux send_sigiotask hook to use the current task SID rather than the target task SID in its permission check, yielding the wrong permission check. This fixes the hook function. Detected by the ltp selinux testsuite and confirmed to correct the test failure. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
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