Re: [PATCH v2] kmsg: Honor dmesg_restrict sysctl on /dev/kmsg

[Kees Cook]

On Tue, Apr 9, 2013 at 8:48 AM, Josh Boyer <jwboyer@xxxxxxxxxx> wrote:
> The dmesg_restrict sysctl currently covers the syslog method for access
> dmesg, however /dev/kmsg isn't covered by the same protections.  Most
> people haven't noticed because util-linux dmesg(1) defaults to using the
> syslog method for access in older versions.  With util-linux dmesg(1)
> defaults to reading directly from /dev/kmsg.
>
> Fix this by reworking all of the access methods to use the
> check_syslog_permissions function and adding checks to devkmsg_open and
> devkmsg_read.
>
> This fixes https://bugzilla.redhat.com/show_bug.cgi?id=903192
>
> Reported-by: Christian Kujau <lists@xxxxxxxxxxxxxxx>
> CC: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Eric Paris <eparis@xxxxxxxxxx>
> Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>

Thanks!

Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook
Chrome OS Security
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