Re: sendmmsg: put_user vs __put_user
From: Ulrich Drepper <hidden>
Date: 2012-03-31 12:30:51
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On Fri, Mar 30, 2012 at 20:51, David Miller [off-list ref] wrote:
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.
I was more thinking about the effects of might_fault() then additional tests.