oss-security - Linux Kernel: Missing access_ok() checks in IOCTL function (gpu/drm/i915 Driver)

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Date: Wed, 23 Jan 2019 14:28:51 -0600
From: Timothy Michaud <tmm08a@....edu>
To: oss-security@...ts.openwall.com
Subject: Linux Kernel: Missing access_ok() checks in IOCTL function
 (gpu/drm/i915 Driver)

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[1], it
is possible to escalate privileges similar to the waitid vulnerability[2]

This is CVE-2018-20669

[1] -
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=594cc251fdd0d231d342d88b2fdff4bc42fb0690
[2] - https://salls.github.io/Linux-Kernel-CVE-2017-5123/

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