From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Jiri Slaby <jirislaby@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-serial <linux-serial@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 16/36] tty/vt: consolemap: check put_user() in con_get_unimap()
Date: Wed, 8 Jun 2022 11:13:34 +0300 (EEST) [thread overview]
Message-ID: <10bf163-1b82-743-69f7-2d7a4a8245f5@linux.intel.com> (raw)
In-Reply-To: <e9f35a26-8f5b-f585-2e8c-19690bf3c770@kernel.org>
[-- Attachment #1: Type: text/plain, Size: 1551 bytes --]
On Wed, 8 Jun 2022, Jiri Slaby wrote:
> On 07. 06. 22, 16:19, Ilpo Järvinen wrote:
> > On Tue, 7 Jun 2022, Jiri Slaby wrote:
> >
> > > Only the return value of copy_to_user() is checked in con_get_unimap().
> > > Do the same for put_user() of the count too.
> > >
> > > Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> > > ---
> > > drivers/tty/vt/consolemap.c | 3 ++-
> > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
> > > index 831450f2bfd1..92b5dddb00d9 100644
> > > --- a/drivers/tty/vt/consolemap.c
> > > +++ b/drivers/tty/vt/consolemap.c
> > > @@ -813,7 +813,8 @@ int con_get_unimap(struct vc_data *vc, ushort ct,
> > > ushort __user *uct,
> > > console_unlock();
> > > if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist)))
> > > ret = -EFAULT;
> > > - put_user(ect, uct);
> > > + if (put_user(ect, uct))
> > > + ret = -EFAULT;
> > > kvfree(unilist);
> > > return ret ? ret : (ect <= ct) ? 0 : -ENOMEM;
> > > }
> > >
> >
> > Doesn't this fix something?
>
> If you mean a Fixes tag, this is pre-git.
>
> If you mean a bug, well, likely yes, users now get informed. But I don't think
> anyone cares ;).
Yes, I meant Fixes tag but I guess it's not important.
> But who knows, maybe we will start seeing userspace failures
> now (as they might not provide writable count field -- unlikely). That's one
> of the reasons why I did this as a separate commit. Let's see if are going to
> revert this or not...
Ok.
--
i.
next prev parent reply other threads:[~2022-06-08 8:54 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-07 10:49 [PATCH 01/36] tty/vt: consolemap: use ARRAY_SIZE() Jiri Slaby
2022-06-07 10:49 ` [PATCH 02/36] tty/vt: consolemap: rename and document struct uni_pagedir Jiri Slaby
2022-06-07 12:36 ` Ilpo Järvinen
2022-06-08 5:42 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 03/36] tty/vt: consolemap: define UNI_* macros for constants Jiri Slaby
2022-06-07 13:21 ` Ilpo Järvinen
2022-06-08 6:55 ` Jiri Slaby
2022-06-08 9:54 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 04/36] tty/vt: consolemap: decrypt inverse_translate() Jiri Slaby
2022-06-07 12:54 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 05/36] tty/vt: consolemap: remove extern from function decls Jiri Slaby
2022-06-07 13:33 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 06/36] tty/vt: consolemap: convert macros to static inlines Jiri Slaby
2022-06-07 13:31 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 07/36] tty/vt: consolemap: make parameters of inverse_translate() saner Jiri Slaby
2022-06-07 13:32 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 08/36] tty/vt: consolemap: one line = one statement Jiri Slaby
2022-06-07 13:35 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 09/36] tty/vt: consolemap: use | for binary addition Jiri Slaby
2022-06-07 13:36 ` Ilpo Järvinen
2022-06-07 13:40 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 10/36] tty/vt: consolemap: introduce UNI_*() macros Jiri Slaby
2022-06-07 13:47 ` Ilpo Järvinen
2022-06-08 6:59 ` Jiri Slaby
2022-06-08 7:30 ` Jiri Slaby
2022-06-08 8:02 ` Ilpo Järvinen
2022-06-08 8:18 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 11/36] tty/vt: consolemap: zero uni_pgdir using kcalloc() Jiri Slaby
2022-06-07 13:51 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 12/36] tty/vt: consolemap: use sizeof(*pointer) instead of sizeof(type) Jiri Slaby
2022-06-07 14:00 ` Ilpo Järvinen
2022-06-07 18:13 ` Jiri Slaby
2022-06-08 7:23 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 13/36] tty/vt: consolemap: make con_set_unimap() more readable Jiri Slaby
2022-06-07 14:06 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 14/36] tty/vt: consolemap: make con_get_unimap() " Jiri Slaby
2022-06-07 14:11 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 15/36] tty/vt: consolemap: make p1 increment less confusing in con_get_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 16/36] tty/vt: consolemap: check put_user() " Jiri Slaby
2022-06-07 14:19 ` Ilpo Järvinen
2022-06-08 7:40 ` Jiri Slaby
2022-06-08 8:13 ` Ilpo Järvinen [this message]
2022-06-08 10:38 ` Andy Shevchenko
2022-06-08 10:43 ` Greg Kroah-Hartman
2022-06-08 8:02 ` David Laight
2022-06-08 8:11 ` Jiri Slaby
2022-06-08 8:13 ` Jiri Slaby
2022-06-09 8:51 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 17/36] tty/vt: consolemap: introduce enum translation_map and use it Jiri Slaby
2022-06-07 10:49 ` [PATCH 18/36] tty/vt: consolemap: remove glyph < 0 check from set_inverse_trans_unicode() Jiri Slaby
2022-06-07 10:49 ` [PATCH 19/36] tty/vt: consolemap: extract dict unsharing to con_unshare_unimap() Jiri Slaby
2022-06-07 14:30 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 20/36] tty/vt: consolemap: saner variable names in set_inverse_trans_unicode() Jiri Slaby
2022-06-07 14:34 ` Ilpo Järvinen
2022-06-07 10:49 ` [PATCH 21/36] tty/vt: consolemap: saner variable names in conv_uni_to_pc() Jiri Slaby
2022-06-07 10:49 ` [PATCH 22/36] tty/vt: consolemap: saner variable names in con_insert_unipair() Jiri Slaby
2022-06-07 10:49 ` [PATCH 23/36] tty/vt: consolemap: saner variable names in con_unify_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 24/36] tty/vt: consolemap: saner variable names in con_do_clear_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 25/36] tty/vt: consolemap: saner variable names in con_unshare_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 26/36] tty/vt: consolemap: saner variable names in con_release_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 27/36] tty/vt: consolemap: saner variable names in con_copy_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 28/36] tty/vt: consolemap: saner variable names in con_get_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 29/36] tty/vt: consolemap: saner variable names in con_set_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 30/36] tty/vt: consolemap: saner variable names in con_set_default_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 31/36] tty/vt: consolemap: make conv_uni_to_pc() more readable Jiri Slaby
2022-06-07 10:49 ` [PATCH 32/36] tty/vt: consolemap: remove superfluous whitespace Jiri Slaby
2022-06-07 10:49 ` [PATCH 33/36] tty/vt: consolemap: change refcount only if needed in con_do_clear_unimap() Jiri Slaby
2022-06-07 15:31 ` Ilpo Järvinen
2022-06-08 7:44 ` Jiri Slaby
2022-06-07 10:49 ` [PATCH 34/36] tty/vt: consolemap: extract con_allocate_new() from con_do_clear_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 35/36] tty/vt: consolemap: use con_allocate_new() in con_unshare_unimap() Jiri Slaby
2022-06-07 10:49 ` [PATCH 36/36] tty/vt: consolemap: walk the buffer only once in con_set_trans_old() Jiri Slaby
2022-06-07 16:25 ` Ilpo Järvinen
2022-06-07 12:36 ` [PATCH 01/36] tty/vt: consolemap: use ARRAY_SIZE() Ilpo Järvinen
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