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protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000deee8705fbca363d" X-Stat-Signature: 7pszmko3oaixwus6od7ik4zbyt3tcohu X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: D54338000A X-HE-Tag: 1684220806-621248 X-HE-Meta: U2FsdGVkX19UkYxLGRc9eIqc2ryj924CHIuJo8S3p766dxR8F6PHz+QvgDSXAxPClButF2ddfrdePNRE6YQ3EhYizj0z6KMohIi1dI4+kC+M4bSsF5quL4n/jGjlcwTms34zgGlduuuu1qoNZSKi3qWJ6hTKbfNDD4tO+gZUCIcYJXXBuLEzf8GJxjWhKc8aLmZXvxLDKDJEVTKxYBS2+oCmSK3cNCWYS6wWrNy7hE3yWgLvVx0loVtWJqdKYuLcpd6irpwJBptbTVpjQWo8HNHzOOSWoOOqALQ/miYbTt4w86Pe9eFjxOJzjKNW0HzI4UcRdBCgGRVMoStmDKOmrQus2+lktRAPjeCPPd9eetkm6jmOb4TEJ4Rn07aEee6IuTmit/XVlrhmxXYgDSElMvWJ2Vvp1wcQ5wBw749kvw9qtYlm67AsrWrVo6NGXM+OZuq05aJullHmF4DP1Zn3hVeDboooAtUaJuvgGM4MGb0Sz/m3x6oFMEaCn1kEsVk/t0uGNjoxOc3b4zlDDeI2OpVF71TkHqV+MI2aXZLmaYOG0O5olja/Z3SftDCywPhVT/ZLsCk/ETUNSQVclSYp/adP1PiOoQg//AdKxHohaVPCO+ikB8xNtREoHtA0Yu706R2ksN8O1gMocMUarBZzZaOGAh/esXSuQFbFCVerp7X2FW/I8ED9rMWo1vkorSYeHZY70ZPCqGbuiHCBZ8+es/i0BqDjCRSBlFIsSEbwAI7pokffLcaC+wRkrxuqIdd/vP8KjhuPFCcqWhHq8ss6T67Np6OACs52Ki/0fY6gaKUV6lpSDwipb6kj7uS4r/R52vMpWj0K14wdRk6CL1gSoajTUVgIORSZX1VvJAbWfneu1i34/IMniEiKPWk3iW4Q/QXz9YqxvpnTq1At+yEnKgF6TFjTyS5wuwuANWIy8gnF64edN6PzORzgxMkxUFrIibElNQNmVDiJ8+JEtCN tOQkEe71 MXbY2nusXZBMRJvfAZhPhZX+9wV3FqiQeQMQSWOhvAN17Aj3nrmJGlrqOSHB/kA2x30Ny3YSSwO9yaq+5TwhA32Fi51d+rVWsRDGlywITYzk3Y7qANTu2phUTIqz9W9hNtD/BJaZ0Jg6PW/DEdYEy4qIXf+98+EGBZJkF+fvsULLcTmXL5S0U5VIKDjjp+YIAFVrrewNMUeIwu9V5grnIIzy8phBijyTZshDtNPoUK+TRgQiXL5hHEVl9Q0M0rhghVGh17AQM6N+xPA1KeUv1qREU7mlm7Z27bxOpLfQj0ou3Wr+jXOJHD9wXSrivYOksvhrb19sIw7YCrcOjxO6mky6GJmPGHf7/Vy0sFBtPuHUUlvbHCXBIWrzcUF8iJt70qNNB6Cd2VEJRkUO50T8DscKjlfOffsJ0pVTjOf+2e0bRJZ9jRUeCXF+hskwBvudfDJTSiUMorswHtvg+8/FWLzmdSQ== 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: --000000000000deee8705fbca363d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, May 15, 2023 at 4:28=E2=80=AFPM Dave Hansen = wrote: > > On 5/15/23 06:05, jeffxu@chromium.org wrote: > > We're using PKU for in-process isolation to enforce control-flow integr= ity > > for a JIT compiler. In our threat model, an attacker exploits a > > vulnerability and has arbitrary read/write access to the whole process > > space concurrently to other threads being executed. This attacker can > > manipulate some arguments to syscalls from some threads. > > This all sounds like it hinges on the contents of PKRU in the attacker > thread. > > Could you talk a bit about how the attacker is prevented from running > WRPKRU, XRSTOR or compelling the kernel to write to PKRU like at sigretur= n? (resending without html) Since we're using the feature for control-flow integrity, we assume the control-flow is still intact at this point. I.e. the attacker thread can't run arbitrary instructions. * For JIT code, we're going to scan it for wrpkru instructions before writing it to executable memory * For regular code, we only use wrpkru around short critical sections to temporarily enable write access Sigreturn is a separate problem that we hope to solve by adding pkey support to sigaltstack --000000000000deee8705fbca363d Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIPoQYJKoZIhvcNAQcCoIIPkjCCD44CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ggz7MIIEtjCCA56gAwIBAgIQeAMYYHb81ngUVR0WyMTzqzANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA3MjgwMDAwMDBaFw0yOTAzMTgwMDAwMDBaMFQxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMSowKAYDVQQDEyFHbG9iYWxTaWduIEF0bGFz 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