From: pstanner@redhat.com
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
Andy Shevchenko <andy@kernel.org>,
Eric Biederman <ebiederm@xmission.com>,
Christian Brauner <brauner@kernel.org>,
David Disseldorp <ddiss@suse.de>,
Luis Chamberlain <mcgrof@kernel.org>,
Siddh Raman Pant <code@siddh.me>,
Nick Alcock <nick.alcock@oracle.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Zack Rusin <zackr@vmware.com>,
VMware Graphics Reviewers <linux-graphics-maintainer@vmware.com>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
kexec@lists.infradead.org, linux-hardening@vger.kernel.org,
David Airlie <airlied@redhat.com>
Subject: Re: [PATCH 1/5] string.h: add array-wrappers for (v)memdup_user()
Date: Wed, 30 Aug 2023 16:23:10 +0200 [thread overview]
Message-ID: <a79b3c34a12abc51bc5e840ae3a87ab9a47f7742.camel@redhat.com> (raw)
In-Reply-To: <CAHp75Vc72uuNvFxq4TGO=nXoGhbqVxyqvQ67ioL8ajtZwMUBgA@mail.gmail.com>
On Wed, 2023-08-30 at 17:15 +0300, Andy Shevchenko wrote:
> On Wed, Aug 30, 2023 at 4:46 PM Philipp Stanner <pstanner@redhat.com>
> wrote:
>
> > + if (unlikely(check_mul_overflow(n, size, &nbytes)))
> > + return ERR_PTR(-EINVAL);
>
> > + if (unlikely(check_mul_overflow(n, size, &nbytes)))
> > + return ERR_PTR(-EINVAL);
>
> Btw, why not -EOVERFLOW ?
>
Good question, actually.
To be honest I wasn't quite sure which code to pick (-E2BIG was also
once I candidate).
-EINVAL was picked because the idea was that a request overflowing a
size_t could surely be expected to contain an invalid parameter,
because no one would ever request an array _that_ large
?
next prev parent reply other threads:[~2023-08-30 18:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-30 13:45 [PATCH 0/5] Introduce new wrappers to copy user-arrays Philipp Stanner
2023-08-30 13:45 ` [PATCH 1/5] string.h: add array-wrappers for (v)memdup_user() Philipp Stanner
2023-08-30 14:11 ` Andy Shevchenko
2023-08-30 14:19 ` pstanner
2023-08-30 14:29 ` Andy Shevchenko
2023-08-30 19:15 ` pstanner
2023-08-31 8:59 ` Andy Shevchenko
2023-08-31 12:16 ` Philipp Stanner
2023-08-31 12:22 ` Philipp Stanner
2023-08-31 13:16 ` Andy Shevchenko
2023-08-31 13:17 ` Andy Shevchenko
2023-08-30 14:15 ` Andy Shevchenko
2023-08-30 14:23 ` pstanner [this message]
2023-08-30 13:45 ` [PATCH 2/5] kernel: kexec: copy user-array safely Philipp Stanner
2023-08-30 13:45 ` [PATCH 3/5] kernel: watch_queue: " Philipp Stanner
2023-08-30 13:45 ` [PATCH 4/5] drm_lease.c: " Philipp Stanner
2023-08-30 13:45 ` [PATCH 5/5] drm: vmgfx_surface.c: " Philipp Stanner
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