From: Arnd Bergmann <arnd@arndb.de>
To: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: "Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Linus Walleij" <linus.walleij@linaro.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
"Linux Media Mailing List" <linux-media@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
"Sakari Ailus" <sakari.ailus@linux.intel.com>,
"Vandana BN" <bnvandana@gmail.com>,
"Hans Verkuil" <hverkuil-cisco@xs4all.nl>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Ezequiel Garcia" <ezequiel@collabora.com>,
"Peilin Ye" <yepeilin.cs@gmail.com>,
"Dan Carpenter" <dan.carpenter@oracle.com>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees] [PATCH v3] media/v4l2-core: Fix kernel-infoleak in video_put_user()
Date: Thu, 30 Jul 2020 10:15:24 +0200 [thread overview]
Message-ID: <CAK8P3a1m7C0rGGEHvndhxun2TyFh-cweNnPHp-rDtu7Z=YyUKw@mail.gmail.com> (raw)
In-Reply-To: <CAMRc=MciXb152=CHAi1kfpwFuELLN55-BfNOo8hBg8Tzp4wMnQ@mail.gmail.com>
On Thu, Jul 30, 2020 at 10:07 AM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> On Tue, Jul 28, 2020 at 3:58 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > On Tue, Jul 28, 2020 at 3:06 PM Dan Carpenter <dan.carpenter@oracle.com> wrote:
> > Something like
> >
> > static int lineevent_put_data(void __user *uptr, struct gpioevent_data *ge)
> > {
> > #ifdef __x86_64__
> > /* i386 has no padding after 'id' */
> > if (in_ia32_syscall()) {
> > struct {
> > compat_u64 timestamp __packed;
> > u32 id;
> > } compat_ge = { ge->timestamp, ge->id };
> >
> > if (copy_to_user(uptr, &compat_ge, sizeof(compat_ge)))
> > return -EFAULT;
> >
> > return sizeof(compat_ge);
> > }
> > #endif
> >
> > if (copy_to_user(uptr, ge, sizeof(*ge))
> > return -EFAULT;
> >
> > return sizeof(*ge);
> > }
> >
> > Arnd
>
> Hi Arnd,
>
> Andy actually had a patch for that but since this isn't a regression
> (it never worked), we decided to leave it as it is and get it right in
> v2 API.
I would argue that it needs to be fixed anyway, unless you also want
to remove the v1 interface for native mode. If this works on 32-bit
kernels, on 64-bit kernels with 64-bit user space and on compat
32-bit user space on 64-bit non-x86 architectures, I see no reason
to leave it broken specifically on x86 compat user space. There are
still reasons to use 32-bit x86 user space for low-memory machines
even though native i386 kernels are getting increasingly silly.
Arnd
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next prev parent reply other threads:[~2020-07-30 8:15 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-26 16:44 [Linux-kernel-mentees] [PATCH] media/v4l2-core: Fix kernel-infoleak in video_put_user() Peilin Ye
2020-07-26 17:30 ` Laurent Pinchart
2020-07-26 18:07 ` Peilin Ye
2020-07-26 22:08 ` Laurent Pinchart
2020-07-26 22:15 ` Peilin Ye
2020-07-26 18:12 ` Peilin Ye
2020-07-26 22:05 ` [Linux-kernel-mentees] [PATCH v2] " Peilin Ye
2020-07-26 22:10 ` Laurent Pinchart
2020-07-26 22:16 ` Peilin Ye
2020-07-26 22:27 ` [Linux-kernel-mentees] [PATCH v3] " Peilin Ye
2020-07-27 7:25 ` Arnd Bergmann
2020-07-27 7:56 ` Peilin Ye
2020-07-27 13:16 ` Dan Carpenter
2020-07-27 14:05 ` Arnd Bergmann
2020-07-27 14:14 ` Peilin Ye
2020-07-27 14:20 ` Arnd Bergmann
2020-07-27 14:46 ` Dan Carpenter
2020-07-27 15:30 ` Peilin Ye
2020-07-27 14:43 ` Dan Carpenter
2020-07-27 14:55 ` Arnd Bergmann
2020-07-27 22:04 ` Peilin Ye
2020-07-28 9:00 ` Arnd Bergmann
2020-07-28 10:02 ` Dan Carpenter
2020-07-27 22:33 ` Peilin Ye
2020-07-28 9:10 ` Arnd Bergmann
2020-07-28 9:47 ` Dan Carpenter
2020-07-28 13:13 ` Peilin Ye
2020-07-28 12:22 ` Linus Walleij
2020-07-28 13:06 ` Dan Carpenter
2020-07-28 13:58 ` Arnd Bergmann
2020-07-30 8:07 ` Bartosz Golaszewski
2020-07-30 8:15 ` Arnd Bergmann [this message]
2020-07-30 8:38 ` Andy Shevchenko
2020-07-30 9:18 ` Arnd Bergmann
2020-07-30 11:48 ` Andy Shevchenko
2020-07-30 13:49 ` Arnd Bergmann
2020-08-02 16:55 ` Peilin Ye
2020-07-27 8:00 ` [Linux-kernel-mentees] [PATCH v4] " Peilin Ye
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