Date: Thu, 7 Feb 2019 13:17:25 -0600 From: Timothy Michaud <tmm08a@....edu> To: Ben Hutchings <ben.hutchings@...ethink.co.uk> Cc: Yves-Alexis Perez <corsac@...ian.org>, oss-security@...ts.openwall.com Subject: Re: Linux Kernel: Missing access_ok() checks in IOCTL function (gpu/drm/i915 Driver) Hi Ben, I believe you're correct. (grsecurity agrees with you for what it's worth). I've emailed mitre but have not heard back yet. Cheers, Tim M. On Thu, Feb 7, 2019 at 12:13 PM Ben Hutchings <ben.hutchings@...ethink.co.uk> wrote: > On Thu, 2019-01-24 at 10:30 +0100, Yves-Alexis Perez wrote: > > On Wed, 2019-01-23 at 14:28 -0600, Timothy Michaud wrote: > > > NOTE: I have requested a CVE identifier, and I'm sending this message, > to > > > make tracking of the fix easier; however, to avoid missing security > fixes > > > without CVE identifiers, you should *NOT* be cherry-picking a specific > > > patch in response to a notification about a kernel security bug. > > > > > > Due to a lack of "access_ok()" checks in > i915_gem_execbuffer2_ioctl, it > > > is possible to escalate privileges similar to the waitid > vulnerability > > > > Hi, thanks for the report. > > > > The patch doesn't seem CC: stable, could you give us a status on the > various > > stable releases? > > Is there even a real security issue here? So far as I can see, > i915_gem_execbuffer2_ioctl() writes to a subset of the user memory > range that it previously read using copy_from_user(). copy_from_user() > does include the range check. > > Ben. > > -- > Ben Hutchings, Software Developer Codethink Ltd > https://www.codethink.co.uk/ Dale House, 35 Dale Street > Manchester, M1 2HF, United Kingdom >
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