#panfrost on 2020-09-09 — irc logs at freenode.irclog.whitequark.org

2019-09-06 11:20 alyssa changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard & Bifrost - Logs https://freenode.irclog.whitequark.org/panfrost - <daniels> avoiding X is a huge feature

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04:32 <icecream95> macc24: I can reproduce, so will start bisecting. Note that PAN_MESA_DEBUG=gles3 has been removed as it is always on now

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05:40 <macc24> icecream95: in 20.2 branch the issue also happens

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06:11 <icecream95> I've bisected it to b4de9e035ac ("pan/mdg: Mask spills from texture write")

06:16 <icecream95> alyssa: You need to better document that the source for v_mov is the second one as this is the second time you've got it wrong

06:19 <icecream95> The other one is 5e5ea25a0da ("pan/mdg: Explicitly type 64-bit uniform moves")

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07:38 <icecream95> macc24: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6659

07:40 <macc24> icecream95: building and testing now

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07:58 <macc24> icecream95: yeah it fixes the issue

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08:23 <icecream95> https://googleprojectzero.blogspot.com/2020/09/attacking-qualcomm-adreno-gpu.html

08:25 <icecream95> I'd like to see someone try and do an exploit like this on Mali, which has no microcode, ring buffers, or shared scratch buffers etc. :P

08:31 <narmstrong> alyssa: \o/ Using modifier 800000000000051

08:31 <narmstrong> Rendered 121 frames in 2.016647 sec (60.000585 fps)

08:32 <narmstrong> `kmscube -m 0x800000000000051 -f AR24`

08:32 <narmstrong> I had to enable DRM_FORMAT_XRGB8888 & DRM_FORMAT_ARGB8888 for YTR

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08:41 <daniels> \o/

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11:49 <alyssa> icecream95: eep, right. that's inherited from the hardware for really silly reasons.. uh..

11:52 <alyssa> thanks for tracking that

11:54 <alyssa> icecream95: and yes, that seems hard to pull off on Mali :P

12:21 <robmur01> once again, giving the GPU the ability to reprogram its own MMU proves to be a terrible idea...

12:21 <robmur01> every exploit seems to come back to that :)

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16:51 <endrift> I had an exploit in the Broadcom VideoCore 4 driver that, despite being reported to them, never got fixed until years later when they refactored the driver :/

16:51 <endrift> no CVE-ID either because of, uh, issues with my employer

16:52 <endrift> turns out if you put a message queue in the kernel you should be very careful with your bounds checks

16:52 <endrift> they were careful, but not careful enough :P

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