From patchwork Thu Jul 22 00:47:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12392749 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59603C6377D for ; Thu, 22 Jul 2021 01:14:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3DF0061261 for ; Thu, 22 Jul 2021 01:14:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229621AbhGVAeK (ORCPT ); Wed, 21 Jul 2021 20:34:10 -0400 Received: from sonic314-27.consmr.mail.ne1.yahoo.com ([66.163.189.153]:44594 "EHLO sonic314-27.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230017AbhGVAeJ (ORCPT ); Wed, 21 Jul 2021 20:34:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626916485; bh=hUIEN/jkZKY8m2uzjLwNZCG83d2ZZblt6dRbcr8DXxA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=EANc1bFP44hMnyOO2/dzZAihxfbH6QcYuZQGbhjM1WggjWYXZmyH0OFo1x8O5zArCnJGRrVQQ60DvOKWy/TP2w4yuvQ/zfkhFJ27yD1vUjZKlw9o/avWK9rJyR/scXm0IDAnDzV3Z0mapUWezA+ndEan01HY3Ptwnd7M3MZObDA8Ghk2V3/F6Ero5BsWOSrD0Ij7qocJ+RmWzW2/KmwCCxV3QDgZsSmD6d5o65wqfhdpjAefB2nobvZKjlzHnTjUZSEWhXtd63NKZEUyBElK/qIv74iYc5W9/GN19F2uVncicPNmZ7+68tcGFjdCZF8YaEYIFzLPmAmocGgmkXMukA== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626916485; bh=O/nnbz454/CSSydAFHr2zdhp/ev8vulWnObRXQFnUaa=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=rRvfNqWF9LMkEkjyu/EVLX9jxp6KgtDZo5opdC5RUpilDLVl7ncTeMmYaDA8lO97h6OVeeY+uWImgNMV2Mu0ONoKFFfPeHB8b8J9TuZI819V9gaTF7brgAfGkYEo8rUQ/+YdWUtoIF4Sh5UPUbQZC8MfC73RDz0c8dtLrQGBmdjombX8MD/MqfWmK0J+9NKf+nzZGU87Dbjjcgb3iz+61qGGi4vDGnYajbHnkxfxC4YMHOxeErzjv5KJB1sLOcDkgCTl9OoWuGr/w6/DVPfF++6mguByCvcB5rtza+sJQtqGLV3JYHmdIaaJLtW/dVRxWqwKQlPgkV3Kjw7Piu9SaA== X-YMail-OSG: lKg6aNYVM1krbXvx3w4xcDJa35JUYwGpWg3TuZHlCcX_0mc.shpQ_0wrhuWwyIC _PSglAINUl07GOoW9SSQyMYumX6j5AoMRqaj1hSzXbpntmNh57MIqoL7iXsrovy_FPb7fHxvcaOk mFIohkaxGxeefBaX_xx.vBbDXqXHKZy60.fbgSZXJ4FD_hafdxd3XDLmw1KeyqkJRYjeKkZUzOYs AfF37r0cLDsMtvSupm14vl3Tf_mVx1RC8XoPzdJtPf64KuDVwkR2UGeenk8.tCr3WY.TeDD40bFU qqlWjJiJ_Xrv3YmQm6mUR8iyLKtEMPr7X4W0U41AwYnUWS8sL02H2upGbjl4BtKjVXrl_o1aE1U6 b5VL06mHMadAfLVGnJYD5rIU8AacX4TSD_uTwFGpYmDnxlyk2ATnmrM1wLRWHlPQKMukBZIW_fY_ Xg5FDVPhgwYrLqmqYWsRANX.Z4_9lf8YoijmOTNHXkYUTiAKkYO_qBfMmLNmurI_QcLeH7aHQLO0 7TN4n.2BOL2UjgbNmfvkiOB1Ttkt8IsNzq7Hwxb6OV7BPhG3d7XG0ibYeZZB39_a2fcy4iLmgeFL YNCLoXUJExSJ9fb7oazdfPYU3C3TR2MStqGQeTP8ocEn6xwUswRXDLEeqIPTcve_7wAtiVN.GBp. gEyXfg5oRbX7skpwQ6ErP3sMQO.vwZrvtpKaZYeHqZgW3Rzbp.LP4fJqRXqm2UXIIDtOd1yJJHbQ 7RydC_zGPf2mC.9fzfl2c9OMeNBPpFDDJreWxm3N9jCukR64l4qdP7j2vPjdeni1TJrSFInJVkH0 rr_yoVxYhBPcLLOC0ynfBi27TfFDJLWjv4RQ_PTYlgSdqebdc4jBbAWpcdAHcdPmPjzHeoBvbFfX sE0nnGSmGd44NQHxwtyBM3T_.8xbDSJakwIq4_LptGfI4nolUPykCudDgA3avvOVsjhMq_0WDPsd TUWrBUDoIpQrTPVsnjRUMydflUuvSgrkW4WbOCWNCvOJ9KktS7P7_En3pvVIvdAaILFedr.f_pqJ rczBd.H5_5x2yI15.nXmT8pfRIiKnwUsxSvW07B8uXPGo3hCfW_llqV87NpvUx6mOZxD4dHLnD1V Fyh1r.p.KrorV9CdEyfnXy8O8B8vAdPkBrgnEdwofcQYOuILpyxhBn.Gb13PTGnU_QCTkQiD5XFk qPO1mU6Pfi2YqcCisk6eHrvAruxPVryPV4jPeZ4H_mwivWTwmk.g75SNrEe3QT5O93HsTvSf1UnZ x8NFvgcT1PZB803l0exypO_wDvMEWW0MvR0vIExTeoEOr2fNqzod55IskrVcKKg3JUA8QfQ6VETS WI3_zB.C_sv1AYJb_CvUMit0HgffZsjp5corBUtpPB2H2A5QvgAmHr4SR4KQWhY5SyiyJyUB9WIA csFa._ezo8WSMKqUi7oBldAnWT1Pnv0GhEuSRN6x33g3Jjmh.o9.3JGnpdR8nPqQWSRu4LfDTzx. uDdVHhtIMTseFBLHWekExyq9q.iWigxDg9aa1XwUx_tgoFABNKfYID_J71pmltazP2B5NaqRsOzn 527U3YA6dvQYi4AbCnba8lI3qkf5vhXqlDCJX4IB1WsXNq4cv9vLF8xdQvAZ14OkUlmHh4ZeXSst v8bJSiaZiKTm2WVRAgU3oXBIWozsJpLwcdloSdnhtxpzT53UGkNBZeKKlDpxQHc9He5iDS6LivRj xo8i_IOB59YNzss9TBWrb08U1U7qAkhOf1EOdC9fgAZL.Khl5EMznpERuZn88IL5an1lRIWoo.Oc k3rT.hpT1To2EF82Ofy9XteibbJ647jRbHmKWJzIN35tM_ecjLUKy4krfStnqCZTDq1h7XknBiZq _zTMyBEicwBAcUbJFT2n8JsKRy_9s3c6434SUpEDRYFlRX4mbVsBlhqJrQd6mbGWRuEr3HpbphzX Abv9Wpjb435mQhP5iGRZKbe3.HSYfpNQYqOlzMpC9E8n66ugCWLTkLi6c1mnessmK6NWD2WM7J_d WOslzlFZdkScp_jlfrG2apD0ELVBS3KzohoxZ.Ger7gsqy7NTFbWaBaYeP203CmZHSVJCmFB1wHD 3dMwMn53XUS4hdAPSTcAmX75t575jHSkMzoATH2O2_7l6oPmA06Q3i08M8GjiEma.C8IBc6VxDad R4FG_VKsfxgltmbWIcyz84ZdteTZKN3unXq4wmHZn1F78JTuSA0VWxv7WmGTN7xe0qZyodYdHQly aEEPoYcV6NGD_JXn8VSxUgW.QB8qkM6axtlwGHf51JcfWYKVnBejNKWQu.D17LAVw.sgx0EYsJc. HomuX1khQZLGtvxmMsug.UC63NkFmPT7trq03MbN_E5D85NH2ifMPHbdMEhodJOxw1Pz9KxH5EXR Wfzhz1kTw594bwACUyqOEonqKGpGP4G8ywf46S3eZ_jP7ZKiEVLUQjPMg..5O_apKYp5C.RRUjgs kO6JPisKyf1xPuLM.iK3XnZ2W52_PTx.CpbMGQ8COZYPdc_lwqX298us5bSS6VBY6KhgaZ8bCkid 1FKohrMPxYTMQ.KD_pJ5CJLuTDHxT0JHQR89E05ah_gSGfxw3cGBZkFQWJCTyz6N9GDJCsYCqo.m sjTUwiBYx_baQR5ofQKgrIdYCKY0fDNqk0KBStuv358YFwvD3.Yxxr98QWKRU_vYNyQDDKfKk0Kg 5jEUR7_HOdqAGQAR4jZTlrbeiR.CYO0CyNVOKcFEJ8OTOLhppROk574qyi03hTkir.M8N8vCaTGe o_zGbRKaEPEl1P2lGkWi_GjAQFf8LsUnr7zF6rSRR3of6Hu8XAYzxO5qBm2aOcP1YK.sTSZTGagu RBwE6zJreHXdZSNEAV6Uo9odBC4H8EVW5LlPXx6qKgjXcs_2hdQpIsrAfpv5CnrHmWBl3tqQqPzY u0YYJSTxxJMPVF.uTThOAFPgEe1FFpUtNfF9PiI6tAYkwsatLhHDAmCA1z7GK.BZ5W9BpG5WKye0 3psOlsxg27x4G7M4BbylzEzI5pnpLC0lkPuGO_Ajia5k1xLbyth7wDSkJ8WSEGBPR09wv1yFYELr 0Evbik.5kcpcfJCPymZHkmETDtHR0VBcpMe7IswtVGgG9pI9wv2QJTstyPFGiQfxSKFlbDKXyV1M 9LhpehMjLHEIikq4HHkbInESQwXZWdpe1z9uSMpLGHPkIulHIMDLDL41meAIHroR.9XHcimwk9Zd Ffo4S.Aa0kbsYzbV_XxBA5cCl1__WWKlidsA_NKRYhyQ_l.l_jpi8yJYRreZ1HVY9Ts.S.kBUcbx _Um0Qj.EjmC4Xxl9PwWJy1JDY X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic314.consmr.mail.ne1.yahoo.com with HTTP; Thu, 22 Jul 2021 01:14:45 +0000 Received: by kubenode577.mail-prod1.omega.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 5053ca2438d7ae37367f534ca924a89a; Thu, 22 Jul 2021 01:14:42 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v28 24/25] LSM: Add /proc attr entry for full LSM context Date: Wed, 21 Jul 2021 17:47:57 -0700 Message-Id: <20210722004758.12371-25-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210722004758.12371-1-casey@schaufler-ca.com> References: <20210722004758.12371-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: Add an entry /proc/.../attr/context which displays the full process security "context" in compound format: lsm1\0value\0lsm2\0value\0... This entry is not writable. A security module may decide that its policy does not allow this information to be displayed. In this case none of the information will be displayed. Reviewed-by: Kees Cook Signed-off-by: Casey Schaufler Cc: linux-api@vger.kernel.org Cc: linux-doc@vger.kernel.org --- Documentation/ABI/testing/procfs-attr-context | 14 ++++ Documentation/security/lsm.rst | 14 ++++ fs/proc/base.c | 1 + include/linux/lsm_hooks.h | 6 ++ security/apparmor/include/procattr.h | 2 +- security/apparmor/lsm.c | 8 +- security/apparmor/procattr.c | 22 +++--- security/security.c | 79 +++++++++++++++++++ security/selinux/hooks.c | 2 +- security/smack/smack_lsm.c | 2 +- 10 files changed, 135 insertions(+), 15 deletions(-) create mode 100644 Documentation/ABI/testing/procfs-attr-context diff --git a/Documentation/ABI/testing/procfs-attr-context b/Documentation/ABI/testing/procfs-attr-context new file mode 100644 index 000000000000..40da1c397c30 --- /dev/null +++ b/Documentation/ABI/testing/procfs-attr-context @@ -0,0 +1,14 @@ +What: /proc/*/attr/context +Contact: linux-security-module@vger.kernel.org, +Description: The current security information used by all Linux + security module (LSMs) that are active on the system. + The details of permissions required to read from + this interface and hence obtain the security state + of the task identified is dependent on the LSMs that + are active on the system. + A process cannot write to this interface. + The data provided by this interface will have the form: + lsm_name\0lsm_data\0[lsm_name\0lsm_data\0]... + where lsm_name is the name of the LSM and the following + lsm_data is the process data for that LSM. +Users: LSM user-space diff --git a/Documentation/security/lsm.rst b/Documentation/security/lsm.rst index b77b4a540391..070225ae6ceb 100644 --- a/Documentation/security/lsm.rst +++ b/Documentation/security/lsm.rst @@ -143,3 +143,17 @@ separated list of the active security modules. The file ``/proc/pid/attr/interface_lsm`` contains the name of the security module for which the ``/proc/pid/attr/current`` interface will apply. This interface can be written to. + +The infrastructure does provide an interface for the special +case where multiple security modules provide a process context. +This is provided in compound context format. + +- `lsm\0value\0lsm\0value\0` + +The `lsm` and `value` fields are NUL-terminated bytestrings. +Each field may contain whitespace or non-printable characters. +The NUL bytes are included in the size of a compound context. +The context ``Bell\0Secret\0Biba\0Loose\0`` has a size of 23. + +The file ``/proc/pid/attr/context`` provides the security +context of the identified process. diff --git a/fs/proc/base.c b/fs/proc/base.c index f80ed1c40053..387627fd8313 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2821,6 +2821,7 @@ static const struct pid_entry attr_dir_stuff[] = { ATTR(NULL, "keycreate", 0666), ATTR(NULL, "sockcreate", 0666), ATTR(NULL, "interface_lsm", 0666), + ATTR(NULL, "context", 0444), #ifdef CONFIG_SECURITY_SMACK DIR("smack", 0555, proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops), diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index d2c4bc94d47f..f6ffe8b069e2 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1397,6 +1397,12 @@ * @pages contains the number of pages. * Return 0 if permission is granted. * + * @getprocattr: + * Provide the named process attribute for display in special files in + * the /proc/.../attr directory. Attribute naming and the data displayed + * is at the discretion of the security modules. The exception is the + * "context" attribute, which will contain the security context of the + * task as a nul terminated text string without trailing whitespace. * @ismaclabel: * Check if the extended attribute specified by @name * represents a MAC label. Returns 1 if name is a MAC diff --git a/security/apparmor/include/procattr.h b/security/apparmor/include/procattr.h index 31689437e0e1..03dbfdb2f2c0 100644 --- a/security/apparmor/include/procattr.h +++ b/security/apparmor/include/procattr.h @@ -11,7 +11,7 @@ #ifndef __AA_PROCATTR_H #define __AA_PROCATTR_H -int aa_getprocattr(struct aa_label *label, char **string); +int aa_getprocattr(struct aa_label *label, char **string, bool newline); int aa_setprocattr_changehat(char *args, size_t size, int flags); #endif /* __AA_PROCATTR_H */ diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 4237536106aa..65a004597e53 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -602,6 +602,7 @@ static int apparmor_getprocattr(struct task_struct *task, char *name, const struct cred *cred = get_task_cred(task); struct aa_task_ctx *ctx = task_ctx(current); struct aa_label *label = NULL; + bool newline = true; if (strcmp(name, "current") == 0) label = aa_get_newest_label(cred_label(cred)); @@ -609,11 +610,14 @@ static int apparmor_getprocattr(struct task_struct *task, char *name, label = aa_get_newest_label(ctx->previous); else if (strcmp(name, "exec") == 0 && ctx->onexec) label = aa_get_newest_label(ctx->onexec); - else + else if (strcmp(name, "context") == 0) { + label = aa_get_newest_label(cred_label(cred)); + newline = false; + } else error = -EINVAL; if (label) - error = aa_getprocattr(label, value); + error = aa_getprocattr(label, value, newline); aa_put_label(label); put_cred(cred); diff --git a/security/apparmor/procattr.c b/security/apparmor/procattr.c index c929bf4a3df1..be3b083d9b74 100644 --- a/security/apparmor/procattr.c +++ b/security/apparmor/procattr.c @@ -20,6 +20,7 @@ * aa_getprocattr - Return the profile information for @profile * @profile: the profile to print profile info about (NOT NULL) * @string: Returns - string containing the profile info (NOT NULL) + * @newline: Should a newline be added to @string. * * Returns: length of @string on success else error on failure * @@ -30,20 +31,21 @@ * * Returns: size of string placed in @string else error code on failure */ -int aa_getprocattr(struct aa_label *label, char **string) +int aa_getprocattr(struct aa_label *label, char **string, bool newline) { struct aa_ns *ns = labels_ns(label); struct aa_ns *current_ns = aa_get_current_ns(); + int flags = FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED; int len; if (!aa_ns_visible(current_ns, ns, true)) { aa_put_ns(current_ns); return -EACCES; } + if (newline) + flags |= FLAG_SHOW_MODE; - len = aa_label_snxprint(NULL, 0, current_ns, label, - FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | - FLAG_HIDDEN_UNCONFINED); + len = aa_label_snxprint(NULL, 0, current_ns, label, flags); AA_BUG(len < 0); *string = kmalloc(len + 2, GFP_KERNEL); @@ -52,19 +54,19 @@ int aa_getprocattr(struct aa_label *label, char **string) return -ENOMEM; } - len = aa_label_snxprint(*string, len + 2, current_ns, label, - FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | - FLAG_HIDDEN_UNCONFINED); + len = aa_label_snxprint(*string, len + 2, current_ns, label, flags); if (len < 0) { aa_put_ns(current_ns); return len; } - (*string)[len] = '\n'; - (*string)[len + 1] = 0; + if (newline) { + (*string)[len] = '\n'; + (*string)[++len] = 0; + } aa_put_ns(current_ns); - return len + 1; + return len; } /** diff --git a/security/security.c b/security/security.c index 5d7fd982f84a..4572da4e27f7 100644 --- a/security/security.c +++ b/security/security.c @@ -801,6 +801,57 @@ static int lsm_superblock_alloc(struct super_block *sb) return 0; } +/** + * append_ctx - append a lsm/context pair to a compound context + * @ctx: the existing compound context + * @ctxlen: size of the old context, including terminating nul byte + * @lsm: new lsm name, nul terminated + * @new: new context, possibly nul terminated + * @newlen: maximum size of @new + * + * replace @ctx with a new compound context, appending @newlsm and @new + * to @ctx. On exit the new data replaces the old, which is freed. + * @ctxlen is set to the new size, which includes a trailing nul byte. + * + * Returns 0 on success, -ENOMEM if no memory is available. + */ +static int append_ctx(char **ctx, int *ctxlen, const char *lsm, char *new, + int newlen) +{ + char *final; + size_t llen; + size_t nlen; + size_t flen; + + llen = strlen(lsm) + 1; + /* + * A security module may or may not provide a trailing nul on + * when returning a security context. There is no definition + * of which it should be, and there are modules that do it + * each way. + */ + nlen = strnlen(new, newlen); + + flen = *ctxlen + llen + nlen + 1; + final = kzalloc(flen, GFP_KERNEL); + + if (final == NULL) + return -ENOMEM; + + if (*ctxlen) + memcpy(final, *ctx, *ctxlen); + + memcpy(final + *ctxlen, lsm, llen); + memcpy(final + *ctxlen + llen, new, nlen); + + kfree(*ctx); + + *ctx = final; + *ctxlen = flen; + + return 0; +} + /* * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and * can be accessed with: @@ -2234,6 +2285,10 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name, char **value) { struct security_hook_list *hp; + char *final = NULL; + char *cp; + int rc = 0; + int finallen = 0; int ilsm = lsm_task_ilsm(current); int slot = 0; @@ -2261,6 +2316,30 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name, return -ENOMEM; } + if (!strcmp(name, "context")) { + hlist_for_each_entry(hp, &security_hook_heads.getprocattr, + list) { + rc = hp->hook.getprocattr(p, "context", &cp); + if (rc == -EINVAL) + continue; + if (rc < 0) { + kfree(final); + return rc; + } + rc = append_ctx(&final, &finallen, hp->lsmid->lsm, + cp, rc); + kfree(cp); + if (rc < 0) { + kfree(final); + return rc; + } + } + if (final == NULL) + return -EINVAL; + *value = final; + return finallen; + } + hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm)) continue; diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 12ae311b7275..046570556e5a 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6458,7 +6458,7 @@ static int selinux_getprocattr(struct task_struct *p, goto bad; } - if (!strcmp(name, "current")) + if (!strcmp(name, "current") || !strcmp(name, "context")) sid = __tsec->sid; else if (!strcmp(name, "prev")) sid = __tsec->osid; diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index e65497a5c095..1618d7d6154b 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3477,7 +3477,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value) char *cp; int slen; - if (strcmp(name, "current") != 0) + if (strcmp(name, "current") != 0 && strcmp(name, "context") != 0) return -EINVAL; cp = kstrdup(skp->smk_known, GFP_KERNEL);