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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<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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<macc24> icecream95: in 20.2 branch the issue also happens
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<icecream95> I've bisected it to b4de9e035ac ("pan/mdg: Mask spills from texture write")
<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
<icecream95> The other one is 5e5ea25a0da ("pan/mdg: Explicitly type 64-bit uniform moves")
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<macc24> icecream95: building and testing now
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<macc24> icecream95: yeah it fixes the issue
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<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
<narmstrong> alyssa: \o/ Using modifier 800000000000051
<narmstrong> Rendered 121 frames in 2.016647 sec (60.000585 fps)
<narmstrong> `kmscube -m 0x800000000000051 -f AR24`
<narmstrong> I had to enable DRM_FORMAT_XRGB8888 & DRM_FORMAT_ARGB8888 for YTR
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<daniels> \o/
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<alyssa> icecream95: eep, right. that's inherited from the hardware for really silly reasons.. uh..
<alyssa> thanks for tracking that
<alyssa> icecream95: and yes, that seems hard to pull off on Mali :P
<robmur01> once again, giving the GPU the ability to reprogram its own MMU proves to be a terrible idea...
<robmur01> every exploit seems to come back to that :)
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<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 :/
<endrift> no CVE-ID either because of, uh, issues with my employer
<endrift> turns out if you put a message queue in the kernel you should be very careful with your bounds checks
<endrift> they were careful, but not careful enough :P
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