11 Dec
2017
11 Dec
'17
9:41 a.m.
From: Kees Cook
Sent: 08 December 2017 21:10
There's no good reason to separate the access_ok() from the copy, especially since the access_ok() size is hard-coded instead of using sizeof(). Instead, just use copy_from_user() directly.
Looks like an optimisation to save doing the access_ok() check for every 'fence'.
If it really makes a difference, okay, but access_ok() checks are fast. :P
Not compared to get_user() :-)
David