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proc: prevent changes to overridden credentials
commit 35a196bef449b5824033865b963ed9a43fb8c730 upstream. Prevent userspace from changing the the /proc/PID/attr values if the task's credentials are currently overriden. This not only makes sense conceptually, it also prevents some really bizarre error cases caused when trying to commit credentials to a task with overridden credentials. Cc: <[email protected]> Reported-by: "chengjian (D)" <[email protected]> Signed-off-by: Paul Moore <[email protected]> Acked-by: John Johansen <[email protected]> Acked-by: James Morris <[email protected]> Acked-by: Casey Schaufler <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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