Re: sendmmsg: put_user vs __put_user

From: David Miller
Date: Fri Mar 30 2012 - 20:52:15 EST

From: Ulrich Drepper <drepper@xxxxxxxxx>
Date: Fri, 30 Mar 2012 09:36:11 -0400

> Shouldn't the compat code in the sendmmsg implementation use the same
> code as the normal code? In which case you probably want something
> like this:

Compat processes are not able to generate virtual addresses anywhere
near the range where the kernel resides, so the address range
verification done by put_user() is completely superfluous and
therefore not necessary. The normal exception handling done by the
access is completely sufficient.
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