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[77.10.144.44]) by smtp.gmail.com with ESMTPSA id gz12sm6291530ejc.124.2022.01.25.06.33.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Jan 2022 06:33:25 -0800 (PST) From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= To: selinux@vger.kernel.org, James Morris , "Serge E. Hallyn" , linux-security-module@vger.kernel.org, Paul Moore , Stephen Smalley , Eric Paris Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH] mm: create security context for memfd_secret inodes Date: Tue, 25 Jan 2022 15:33:04 +0100 Message-Id: <20220125143304.34628-1-cgzones@googlemail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Rspam-User: nil X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 34824C0007 X-Stat-Signature: 51u8pbuk7upcpgwi1u6jio5yba9m9fkm Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=googlemail.com header.s=20210112 header.b="Mn4PK6g/"; spf=pass (imf22.hostedemail.com: domain of cgzones@googlemail.com designates 209.85.208.54 as permitted sender) smtp.mailfrom=cgzones@googlemail.com; dmarc=pass (policy=quarantine) header.from=googlemail.com X-HE-Tag: 1643121207-982945 Content-Transfer-Encoding: quoted-printable 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: Create a security context for the inodes created by memfd_secret(2) via the LSM hook inode_init_security_anon to allow a fine grained control. As secret memory areas can affect hibernation and have a global shared limit access control might be desirable. Signed-off-by: Christian G=C3=B6ttsche --- An alternative way of checking memfd_secret(2) is to create a new LSM hook and e.g. for SELinux check via a new process class permission. --- mm/secretmem.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/mm/secretmem.c b/mm/secretmem.c index 22b310adb53d..b61cd2f661bc 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -164,11 +164,20 @@ static struct file *secretmem_file_create(unsigned = long flags) { struct file *file =3D ERR_PTR(-ENOMEM); struct inode *inode; + const char *anon_name =3D "[secretmem]"; + const struct qstr qname =3D QSTR_INIT(anon_name, strlen(anon_name)); + int err; =20 inode =3D alloc_anon_inode(secretmem_mnt->mnt_sb); if (IS_ERR(inode)) return ERR_CAST(inode); =20 + err =3D security_inode_init_security_anon(inode, &qname, NULL); + if (err) { + file =3D ERR_PTR(err); + goto err_free_inode; + } + file =3D alloc_file_pseudo(inode, secretmem_mnt, "secretmem", O_RDWR, &secretmem_fops); if (IS_ERR(file)) --=20 2.34.1