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GET /api/patches/1707777/?format=api
{ "id": 1707777, "url": "http://patchwork.ozlabs.org/api/patches/1707777/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/patch/20221122100759.208290-19-benjamin@sipsolutions.net/", "project": { "id": 60, "url": "http://patchwork.ozlabs.org/api/projects/60/?format=api", "name": "User-mode Linux Development", "link_name": "linux-um", "list_id": "linux-um.lists.infradead.org", "list_email": "linux-um@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20221122100759.208290-19-benjamin@sipsolutions.net>", "list_archive_url": null, "date": "2022-11-22T10:07:49", "name": "[v2,18/28] um: Store full CSGSFS and SS register from mcontext", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "171676b4fdd147b4e0da5774046450936234e9cf", "submitter": { "id": 67525, "url": "http://patchwork.ozlabs.org/api/people/67525/?format=api", "name": "Benjamin Berg", "email": "benjamin@sipsolutions.net" }, "delegate": { "id": 54851, "url": "http://patchwork.ozlabs.org/api/users/54851/?format=api", "username": "rw", "first_name": "Richard", "last_name": "Weinberger", "email": "richard@nod.at" }, "mbox": "http://patchwork.ozlabs.org/project/linux-um/patch/20221122100759.208290-19-benjamin@sipsolutions.net/mbox/", "series": [ { "id": 329466, "url": "http://patchwork.ozlabs.org/api/series/329466/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/list/?series=329466", "date": "2022-11-22T10:07:37", "name": "Implement SECCOMP based userland", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/329466/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/1707777/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/1707777/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Tue, 22 Nov 2022 21:27:13 +1100 (AEDT)", "from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux))\n\tid 1oxQUb-007o3G-AA; Tue, 22 Nov 2022 10:27:05 +0000", "from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05])\n\tby bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux))\n\tid 1oxQTN-007nM8-EX\n\tfor linux-um@bombadil.infradead.org; Tue, 22 Nov 2022 10:25:49 +0000", "from s3.sipsolutions.net ([2a01:4f8:191:4433::2]\n helo=sipsolutions.net)\n\tby desiato.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux))\n\tid 1oxQF0-003P1o-Vc\n\tfor linux-um@lists.infradead.org; Tue, 22 Nov 2022 10:11:01 +0000", "by sipsolutions.net with esmtpsa\n (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256)\n\t(Exim 4.96)\n\t(envelope-from <benjamin@sipsolutions.net>)\n\tid 1oxQEq-006IGn-1v;\n\tTue, 22 Nov 2022 11:10:48 +0100" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:\n\tMessage-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=45ugnTrNlARdig66R/E/emCoWuzgdIIWRE9gdG6+9bk=; b=Q7pAPpwtDVBIM8\n\t2STFPLwNp0eio6Ca0AyvBPG+nLiJYjDWuZanerlAEOfAYo9fhbXLH0TPYqA4otCn/UhNaY+cxO8fe\n\thCSaEVfTAH3GzPe6zm9IVsW/WKv0ZRFFTpF+YFGBVzWVMVOzpr/dkS3yZnkrOCZ9b2tlhym2GHbq1\n\tr+TmzPj5Wp93yjT1TwSm38LHyMjFNglYql7pDSqHLik2GJXAzbA0b9MgiuUe6mOc4x5skmDfzCyOH\n\tsHsj1lud8YaIBzZRT7B8H+UzSdEIcIPM3GfTHMycAoQHOW7H9VtHz2c3rQsMn8a7+WSXty8trSOAV\n\tA1Tvam+BOx/Yw0pO5H7A==;", "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version\n\t:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:\n\tContent-Type:Content-ID:Content-Description;\n\tbh=VaZRcxGCiKkWxdH1yaSZCOEj93ggLPfi168EByH2/ww=; b=NXlcKiIeyhdH+zN1N3DBs0QYHu\n\t6gT0Uc8MnDu9RVxibgQi1Dz2Yt4QwuAYByAQ3zGHCH/djNZ5CtAyQ0e2vGY3vIaDdFhxWDSFmDPuR\n\tmJoDfMdZJa2b3+rm6xTYOQzNTv+buoMQz64PCUI4Rv02RCbVMS+eXZY2nqlwIgOgl9Se5jN4IJBcZ\n\tpgeKocjaMWvBWSM/NHD5cZBDLBB3aUI5o9wbMLN8zya+hpf+gwMjKR5OUzcmL1zldB4IWdhbr84wn\n\tZ+jl1dbAu0/TIcIRDMN4dZg8WHq+tEA3YtHQB9L0z26W/C4IVcd2Q3kZUoY7DBHMWg6LfNQ6K5G+M\n\tHsVe0kcQ==;", "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version:\n\tReferences:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Content-Type:Sender\n\t:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To:\n\tResent-Cc:Resent-Message-ID; bh=VaZRcxGCiKkWxdH1yaSZCOEj93ggLPfi168EByH2/ww=;\n\tt=1669111857; x=1670321457; b=A+Q3nuLznSN7O4vD2pTuybvbpeaIAJ3JU5CtVvNI6NnH6ha\n\tNNTOKVARjtErZoDaHT22UkAR2xEHj/EcaAEi5GbqJ+n5+XAsn5noCQa9qP+Ft6gjQbPK8pUrSfBbf\n\tIiVHhhcAZoGhT/e0n0aAEZc+IVmzl+Zut1gySWlTVzm5IKWLsYJGJWzaoQFIXuZ76mpyGOR0P0Qcq\n\tvTCtV8guU1YM1YGDWFUJgLkWPY/2Snt57HqShfISAqjdBJxIaxU2vPcSfUWw1cjxdeQ8iOS6IeUN3\n\tjZAziRzJkqylihh7ysSsR2uOMTuGPTk2xuYaPcflydDaH9bWyumT7CHSbpqnXdtw==;" ], "From": "benjamin@sipsolutions.net", "To": "linux-um@lists.infradead.org", "Cc": "Benjamin Berg <benjamin@sipsolutions.net>", "Subject": "[PATCH v2 18/28] um: Store full CSGSFS and SS register from mcontext", "Date": "Tue, 22 Nov 2022 11:07:49 +0100", "Message-Id": "<20221122100759.208290-19-benjamin@sipsolutions.net>", "X-Mailer": "git-send-email 2.38.1", "In-Reply-To": "<20221122100759.208290-1-benjamin@sipsolutions.net>", "References": "<20221122100759.208290-1-benjamin@sipsolutions.net>", "MIME-Version": "1.0", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20221122_101059_209989_95065165 ", "X-CRM114-Status": "UNSURE ( 9.90 )", "X-CRM114-Notice": "Please train this message.", "X-Spam-Score": "-0.2 (/)", "X-Spam-Report": "Spam detection software,\n running on the system \"desiato.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: From: Benjamin Berg <benjamin@sipsolutions.net> Doing this\n allows using registers as retrieved from an mcontext to be pushed to a\n process\n using PTRACE_SETREGS. It is not entirely clear to me why CSGSFS was\n masked.\n Doing so creates issues when using the mcontext as process state in\n seccomp\n and simply copying the register appears to work perfectly fine for ptr\n [...] \n Content analysis details: (-0.2 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's domain\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily\n valid\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature", "X-BeenThere": "linux-um@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<linux-um.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-um/>", "List-Post": "<mailto:linux-um@lists.infradead.org>", "List-Help": "<mailto:linux-um-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"linux-um\" <linux-um-bounces@lists.infradead.org>", "Errors-To": "linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: Benjamin Berg <benjamin@sipsolutions.net>\n\nDoing this allows using registers as retrieved from an mcontext to be\npushed to a process using PTRACE_SETREGS.\n\nIt is not entirely clear to me why CSGSFS was masked. Doing so creates\nissues when using the mcontext as process state in seccomp and simply\ncopying the register appears to work perfectly fine for ptrace.\n\nSigned-off-by: Benjamin Berg <benjamin@sipsolutions.net>\n---\n arch/x86/um/os-Linux/mcontext.c | 3 +--\n 1 file changed, 1 insertion(+), 2 deletions(-)", "diff": "diff --git a/arch/x86/um/os-Linux/mcontext.c b/arch/x86/um/os-Linux/mcontext.c\nindex 49c3744cac37..81b9d1f9f4e6 100644\n--- a/arch/x86/um/os-Linux/mcontext.c\n+++ b/arch/x86/um/os-Linux/mcontext.c\n@@ -26,7 +26,6 @@ void get_regs_from_mc(struct uml_pt_regs *regs, mcontext_t *mc)\n \tCOPY(RIP);\n \tCOPY2(EFLAGS, EFL);\n \tCOPY2(CS, CSGSFS);\n-\tregs->gp[CS / sizeof(unsigned long)] &= 0xffff;\n-\tregs->gp[CS / sizeof(unsigned long)] |= 3;\n+\tregs->gp[SS / sizeof(unsigned long)] = mc->gregs[REG_CSGSFS] >> 48;\n #endif\n }\n", "prefixes": [ "v2", "18/28" ] }