linux-kernel - Re: [PATCH RESEND v3 2/3] kasan: migrate copy_user

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Message-ID: <CA+fCnZcwoL3qWhKsmgCCPDeAW0zpKGn=H7F8w8Fmsg+7-Y8p3g@mail.gmail.com>
Date: Tue, 15 Oct 2024 03:18:26 +0200
From: Andrey Konovalov <andreyknvl@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Sabyrzhan Tasbolatov <snovitoll@...il.com>
Cc: 2023002089@...k.tyut.edu.cn, alexs@...nel.org, corbet@....net, 
	dvyukov@...gle.com, elver@...gle.com, glider@...gle.com, 
	kasan-dev@...glegroups.com, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, ryabinin.a.a@...il.com, 
	siyanteng@...ngson.cn, vincenzo.frascino@....com, workflows@...r.kernel.org
Subject: Re: [PATCH RESEND v3 2/3] kasan: migrate copy_user_test to kunit

On Tue, Oct 15, 2024 at 1:10 AM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Mon, 14 Oct 2024 07:57:00 +0500 Sabyrzhan Tasbolatov <snovitoll@...il.com> wrote:
>
> > Migrate the copy_user_test to the KUnit framework to verify out-of-bound
> > detection via KASAN reports in copy_from_user(), copy_to_user() and
> > their static functions.
> >
> > This is the last migrated test in kasan_test_module.c, therefore delete
> > the file.
> >
>
> x86_64 allmodconfig produces:
>
> vmlinux.o: warning: objtool: strncpy_from_user+0x8a: call to __check_object_size() with UACCESS enabled

Too bad. I guess we have to duplicate both kasan_check_write and
check_object_size before both do_strncpy_from_user calls in
strncpy_from_user.