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From: "Pedro Falcato" <pedro.falcato@gmail.com>
Date: Thu, 24 Mar 2022 22:32:29 +0000
Message-ID: <CAKbZUD0McHc7-n5OCM5Z8UgT5fWtBgrJcioqzmwpVRK2My+4YA@mail.gmail.com>
Subject: Question about UEFI, AddressSanitizer and MMU mappings
To: edk2-devel-groups-io <devel@edk2.groups.io>
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Hi!

I've been thinking about adding sanitizer support (UBSan and KASAN), like
coreboot already has, to the wiki's Tasks for the upcoming GSoC, but I'm a
bit confused by something.
Is there anything in the UEFI spec that stops us from doing non-identity
memory mappings? I know it specifies the need for the identity mappings (in
the architectures where it requires the MMU being enabled), but nowhere do
I see anything about the other parts of the address space.
Of course, UEFI supporting AddressSanitizer would be kind of dependent on
fancier memory mappings.

Thanks,
Pedro

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<div dir=3D"ltr"><div>Hi!</div><div><br></div><div>I&#39;ve been thinking a=
bout adding sanitizer support (UBSan and KASAN), like coreboot already has,=
 to the wiki&#39;s Tasks for the upcoming GSoC, but I&#39;m a bit confused =
by something.</div><div>Is there anything in the UEFI spec that stops us fr=
om doing non-identity memory mappings? I know it specifies the need for the=
 identity mappings (in the architectures where it requires the MMU being en=
abled), but nowhere do I see anything about the other parts of the address =
space.</div><div>Of course, UEFI supporting AddressSanitizer would be kind =
of dependent on fancier memory mappings.<br></div><div><br></div><div>Thank=
s,</div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"g=
mail_signature"><div dir=3D"ltr">Pedro</div></div></div></div>

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