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Message-ID: <b1bfe507-3dda-fccb-5355-26f6cce9fa6a@suse.cz>
Date: Wed, 4 Jul 2018 15:43:39 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Chris von Recklinghausen <crecklin@...hat.com>, keescook@...omium.org,
labbott@...hat.com, pabeni@...hat.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v7] add param that allows bootline control of hardened
usercopy
On 07/03/2018 09:43 PM, Chris von Recklinghausen wrote:
Subject: [PATCH v7] add param that allows bootline control of hardened
usercopy
s/bootline/boot time/ ?
> v1->v2:
> remove CONFIG_HUC_DEFAULT_OFF
> default is now enabled, boot param disables
> move check to __check_object_size so as to not break optimization of
> __builtin_constant_p()
Sorry for late and drive-by suggestion, but I think the change above is
kind of a waste because there's a function call overhead only to return
immediately.
Something like this should work and keep benefits of both the built-in
check and avoiding function call?
static __always_inline void check_object_size(const void *ptr, unsigned
long n, bool to_user)
{
if (!__builtin_constant_p(n) &&
static_branch_likely(&bypass_usercopy_checks))
__check_object_size(ptr, n, to_user);
}
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