From patchwork Wed Nov 22 14:15:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13464945 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PvuJnPvR" Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24D80D45; Wed, 22 Nov 2023 06:16:26 -0800 (PST) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-6c39ad730aaso5573313b3a.0; Wed, 22 Nov 2023 06:16:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700662585; x=1701267385; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Hrd8Q/aZ94cCzu/B8oHzIUPKN1cXCmsoH2G1FVF6YII=; b=PvuJnPvRDT3dFSPJQEOi0Gni+GO0isWd0WRSvU/ai6tg2xxZ4iZm7S/xl/j1ZSAMsQ syCcURikd+rg575FcwtJdrG48/5pHhC95gSIZPxoK1FL1uI9YTqb/W6Snm4JSG/z0Dvy C+VOMNREwfTrCb96GvK5KAnWMUIUOEvvOoygvu9SR/9FGpQCcsBQyJ7onfHm7S7OHqY8 bRgbltg3bJuYjF9b9k08KGE1K1tHImRaTSPrySwlGQspPj5usqiRnEkwS3VvYhZzCoxL VTF3ec+EvwcfZkEjUsIlYC+0DLfxq3jS4+H8k7TvMAFZKHJNTC+SoDbNQW0ChcEcT+y/ 8qqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700662585; x=1701267385; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Hrd8Q/aZ94cCzu/B8oHzIUPKN1cXCmsoH2G1FVF6YII=; b=uNlKkdcpHMHt6N4nMbUZZTRcMiWiYdAUhV0T6mve+yWF0nJFMdljrr3pYZA6YSqrPZ zpIkOATAjjLSgpFYbPZ+5uK+7Pm74VE725bJXxYOpA1EM+fD+tLSbAiyC1chW2Jsafqf bJv4zGY8BctCUHAkJ7XDrWhiXYKoQ7haKJT3bP2kr2cQmPGqWhXBU6zUUHt24N+RsoCh msucms1GhK0ZDQdSL+LC6lKmpugieWyhJjVlPJa/+RvthuhcEAQtQfRlrthFZO9EPCr+ UPMuzkfBx+XvpZhsUFW7yubARFtLLecYjwRSDL5hJR0XZY/NFwBTXtwhRlpmh15+RYiq 5q+Q== X-Gm-Message-State: AOJu0YzfR7PqAohyy66nxvcYr6wtoYUETiygcrpkeQU91Ez2KvJpgAk9 1/flSLVArSbw9ebpa2w+yyQ= X-Google-Smtp-Source: AGHT+IGF0KDGd0J4OzHwSICvSyOZwIZbK788qwUREZr+VnXmoQq3XSPFAWg5FrUvb1keh4HsnjevJg== X-Received: by 2002:a05:6a20:e113:b0:18a:db62:6922 with SMTP id kr19-20020a056a20e11300b0018adb626922mr2719249pzb.35.1700662585570; Wed, 22 Nov 2023 06:16:25 -0800 (PST) Received: from vultr.guest ([2001:19f0:ac01:a71:5400:4ff:fea8:5687]) by smtp.gmail.com with ESMTPSA id p18-20020a63fe12000000b0058988954686sm9356260pgh.90.2023.11.22.06.16.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 06:16:25 -0800 (PST) From: Yafang Shao To: akpm@linux-foundation.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, omosnace@redhat.com, mhocko@suse.com Cc: linux-mm@kvack.org, linux-security-module@vger.kernel.org, bpf@vger.kernel.org, ligang.bdlg@bytedance.com, Yafang Shao Subject: [RFC PATCH v2 5/6] security: selinux: Implement set_mempolicy hook Date: Wed, 22 Nov 2023 14:15:58 +0000 Message-Id: <20231122141559.4228-6-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20231122141559.4228-1-laoar.shao@gmail.com> References: <20231122141559.4228-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a SELinux access control for the newly introduced set_mempolicy lsm hook. A new permission "setmempolicy" is defined under the "process" class for it. Signed-off-by: Yafang Shao --- security/selinux/hooks.c | 8 ++++++++ security/selinux/include/classmap.h | 2 +- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index feda711c6b7b..1528d4dcfa03 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4238,6 +4238,13 @@ static int selinux_userns_create(const struct cred *cred) USER_NAMESPACE__CREATE, NULL); } +static int selinux_set_mempolicy(unsigned long mode, unsigned short mode_flags, + nodemask_t *nmask, unsigned int flags) +{ + return avc_has_perm(current_sid(), task_sid_obj(current), SECCLASS_PROCESS, + PROCESS__SETMEMPOLICY, NULL); +} + /* Returns error only if unable to parse addresses */ static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct common_audit_data *ad, u8 *proto) @@ -7072,6 +7079,7 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = { LSM_HOOK_INIT(task_kill, selinux_task_kill), LSM_HOOK_INIT(task_to_inode, selinux_task_to_inode), LSM_HOOK_INIT(userns_create, selinux_userns_create), + LSM_HOOK_INIT(set_mempolicy, selinux_set_mempolicy), LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission), LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid), diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index a3c380775d41..c280d92a409f 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -51,7 +51,7 @@ const struct security_class_mapping secclass_map[] = { "getattr", "setexec", "setfscreate", "noatsecure", "siginh", "setrlimit", "rlimitinh", "dyntransition", "setcurrent", "execmem", "execstack", "execheap", "setkeycreate", - "setsockcreate", "getrlimit", NULL } }, + "setsockcreate", "getrlimit", "setmempolicy", NULL } }, { "process2", { "nnp_transition", "nosuid_transition", NULL } }, { "system",