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See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D62D480004 X-Stat-Signature: in4yhm3rbjqrukidmmtdq8bi78shdzhe X-Rspam-User: X-HE-Tag: 1720091484-935246 X-HE-Meta: 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 qJroc+WY 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --=-hIYyopGa3BlK1zndGxK1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-06-21 at 22:14 +0200, Roman Kagan wrote: >=20 > Compared to the approach used in the orignal series, where a dedicated ke= rnel > address range and thus a dedicated PGD was used for mm-local allocations,= the > one proposed here may have certain drawbacks, in particular >=20 > - using user addresses for kernel memory may violate assumptions in vario= us > =C2=A0 parts of kernel code which we may not have identified with smoke t= ests we did >=20 > - the allocated addresses are guessable by the userland (ATM they are eve= n > =C2=A0 visible in /proc/PID/maps but that's fixable) which may weaken the= security > =C2=A0 posture I think this approach makes sense as it's generic and applies immediately to all architectures. I'm slightly uncomfortable about using userspace addresses though, and the special cases that it introduces. I'd like to see a per-arch ARCH_HAS_PROCLOCAL_PGD so that it *can* be put back into a dedicated address range where possible. Looking forward to the x86 KVM code from before being dusted off and put on top of this, and also the Arm version of same. A test driver and test case is all very well, but it's less exciting than the real use case :) --=-hIYyopGa3BlK1zndGxK1 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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