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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - BUG: KASAN: slab-out-of-bounds in OUT_RINGp (via nvc0_fbcon_imageblit)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96306">96306</a>
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<th>Summary</th>
<td>BUG: KASAN: slab-out-of-bounds in OUT_RINGp (via nvc0_fbcon_imageblit)
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Driver/nouveau
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
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<th>Reporter</th>
<td>peter@lekensteyn.nl
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
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<pre>Created <span class=""><a href="attachment.cgi?id=124231" name="attach_124231" title="dmesg output for v4.7-rc1 containing the KASAN report">attachment 124231</a> <a href="attachment.cgi?id=124231&action=edit" title="dmesg output for v4.7-rc1 containing the KASAN report">[details]</a></span>
dmesg output for v4.7-rc1 containing the KASAN report
Previously reported by others to mailing lists (with no replies):
[4.4-rc1] nouveau: BUG: KASAN: slab-out-of-bounds in memcpy+0x1d/0x40
<a href="https://lists.freedesktop.org/archives/dri-devel/2015-November/095100.html">https://lists.freedesktop.org/archives/dri-devel/2015-November/095100.html</a>
[3.10] BUG: drm, nouveau: slab-out-of-bounds read access in
nv50_fbcon_imageblit()
<a href="https://lists.freedesktop.org/archives/dri-devel/2016-May/108270.html">https://lists.freedesktop.org/archives/dri-devel/2016-May/108270.html</a>
Hardware:
Optimus laptop with inteldrmfb being the primary framebuffer, an external
monitor is connected to DP-1 on the Nvidia card (GTX 965M, 10de:13d9).
Steps to reproduce the out-of-bounds issue in my environment:
0. Avoid continuously triggering the error: dmesg -D
1. modprobe nouveau runpm=0 (or be sure to wake the device before using
con2fbmap, there is a nasty (unrelated) deadlock in there due to recursive
console_lockup.)
2. con2fbmap 1 2 (bind console 2 to nouveaufb (1)). This invokes
ioctl(/dev/fb0, FBIOPUT_CON2FBMAP, (u32[2]){2, 1})).
3. If you are not there already, switch to tty2 on the nouveau display.
4. Press Enter until you are at the last line of the console (or past it, I
forgot).
5. Go to a different tty (e.g. the Intel one) and notice the KASAN report in
dmesg.
Attached is yet another log (looks similar to the other ones) for v4.7-rc1
(with two unrelated patchsets applied on top).</pre>
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