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Message-ID: <CAMzpN2joOga7x+wF7EzOVYq_OLr6JmKm-K8f4koLrTZAQ7pY1A@mail.gmail.com>
Date: Thu, 16 Jul 2015 12:02:06 -0400
From: Brian Gerst <brgerst@...il.com>
To: Andy Lutomirski <luto@...capital.net>
Cc: X86 ML <x86@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/7] x86/vm86: Move userspace accesses to do_sys_vm86()
On Thu, Jul 16, 2015 at 11:42 AM, Andy Lutomirski <luto@...capital.net> wrote:
> On Thu, Jul 16, 2015 at 4:46 AM, Brian Gerst <brgerst@...il.com> wrote:
>> Move the userspace accesses down into the common function in
>> preparation for the next set of patches.
>
> Nice!
>
> Could you improve the changelog a bit? You're really changing the way
> it works (in a good way).
>
>
>> - set_flags(regs->pt.flags, VEFLAGS, X86_EFLAGS_VIF | current->thread.v86mask);
>> - tmp = copy_vm86_regs_to_user(¤t->thread.vm86_info->regs, regs);
>> - tmp += put_user(current->thread.screen_bitmap, ¤t->thread.vm86_info->screen_bitmap);
>> - if (tmp) {
>> + set_flags(regs->pt.flags, VEFLAGS, X86_EFLAGS_VIF | tsk->thread.v86mask);
>> + user = tsk->thread.vm86_info;
>> + put_user_try {
>
> I think that put_user_try/put_user_ex requires access_ok.
>
>
>> + get_user_try {
>> + unsigned short seg;
>
> This also needs access_ok, I think.
Good catch. I modeled this off restore_sigcontext(), but the
access_ok() is actually in the caller.
--
Brian Gerst
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