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Lu" Cc: Florian Weimer , GNU C Library , Joseph Myers , "Kirill A . 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Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR03FT052.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB3197 X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, MSGID_FROM_MTA_HEADER, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Sep 2021 09:12:51 -0000 The 08/23/2021 07:15, H.J. Lu via Libc-alpha wrote: > On Mon, Aug 23, 2021 at 6:49 AM Florian Weimer wrote: > > * H. J. Lu: > > > On Mon, Aug 23, 2021 at 2:28 AM Florian Weimer wrote: > > >> As a side effect of the libpthread merge, we freed DF_1_INITFIRST for > > >> other uses, so you should be able to work around initialization ordering > > >> issues, too. > > > > > > The issue here is that LAM should only be enabled ONCE before main > > > and thread creation. Neither DF_1_INITFIRST nor kernel API can properly > > > enforce it. > > > > How does AArch64 solve this? Different kernel API? > > I don't think that AArch64 has addressed this issue at all. i expect the hwasan runtime to have an initializer that ensures that it runs once, early (e.g. the shadow map has to be set up very early too: before any instrumented user code may run) is there a reason the lam setup cannot use this mechanism?