LKML Archive on lore.kernel.org
 help / color / Atom feed
From: "Mickaël Salaün" <mic@digikod.net>
To: linux-kernel@vger.kernel.org
Cc: "Mickaël Salaün" <mic@digikod.net>,
	"Aleksa Sarai" <cyphar@cyphar.com>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Christian Brauner" <christian.brauner@ubuntu.com>,
	"Christian Heimes" <christian@python.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Deven Bowers" <deven.desai@linux.microsoft.com>,
	"Dmitry Vyukov" <dvyukov@google.com>,
	"Eric Biggers" <ebiggers@kernel.org>,
	"Eric Chiang" <ericchiang@google.com>,
	"Florian Weimer" <fweimer@redhat.com>,
	"James Morris" <jmorris@namei.org>, "Jan Kara" <jack@suse.cz>,
	"Jann Horn" <jannh@google.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Kees Cook" <keescook@chromium.org>,
	"Lakshmi Ramasubramanian" <nramas@linux.microsoft.com>,
	"Matthew Garrett" <mjg59@google.com>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Michael Kerrisk" <mtk.manpages@gmail.com>,
	"Mimi Zohar" <zohar@linux.ibm.com>,
	"Philippe Trébuchet" <philippe.trebuchet@ssi.gouv.fr>,
	"Scott Shell" <scottsh@microsoft.com>,
	"Sean Christopherson" <sean.j.christopherson@intel.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Steve Dower" <steve.dower@python.org>,
	"Steve Grubb" <sgrubb@redhat.com>,
	"Tetsuo Handa" <penguin-kernel@I-love.SAKURA.ne.jp>,
	"Thibaut Sautereau" <thibaut.sautereau@clip-os.org>,
	"Vincent Strubel" <vincent.strubel@ssi.gouv.fr>,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH v7 7/7] ima: add policy support for the new file open MAY_OPENEXEC flag
Date: Thu, 23 Jul 2020 19:12:27 +0200
Message-ID: <20200723171227.446711-8-mic@digikod.net> (raw)
In-Reply-To: <20200723171227.446711-1-mic@digikod.net>

From: Mimi Zohar <zohar@linux.ibm.com>

The kernel has no way of differentiating between a file containing data
or code being opened by an interpreter.  The proposed O_MAYEXEC
openat2(2) flag bridges this gap by defining and enabling the
MAY_OPENEXEC flag.

This patch adds IMA policy support for the new MAY_OPENEXEC flag.

Example:
measure func=FILE_CHECK mask=^MAY_OPENEXEC
appraise func=FILE_CHECK appraise_type=imasig mask=^MAY_OPENEXEC

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Link: https://lore.kernel.org/r/1588167523-7866-3-git-send-email-zohar@linux.ibm.com
---
 Documentation/ABI/testing/ima_policy |  2 +-
 security/integrity/ima/ima_main.c    |  3 ++-
 security/integrity/ima/ima_policy.c  | 15 +++++++++++----
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
index cd572912c593..caca46125fe0 100644
--- a/Documentation/ABI/testing/ima_policy
+++ b/Documentation/ABI/testing/ima_policy
@@ -31,7 +31,7 @@ Description:
 				[KEXEC_KERNEL_CHECK] [KEXEC_INITRAMFS_CHECK]
 				[KEXEC_CMDLINE] [KEY_CHECK]
 			mask:= [[^]MAY_READ] [[^]MAY_WRITE] [[^]MAY_APPEND]
-			       [[^]MAY_EXEC]
+			       [[^]MAY_EXEC] [[^]MAY_OPENEXEC]
 			fsmagic:= hex value
 			fsuuid:= file system UUID (e.g 8bcbe394-4f13-4144-be8e-5aa9ea2ce2f6)
 			uid:= decimal value
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index c1583d98c5e5..59fd1658a203 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -490,7 +490,8 @@ int ima_file_check(struct file *file, int mask)
 
 	security_task_getsecid(current, &secid);
 	return process_measurement(file, current_cred(), secid, NULL, 0,
-				   mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
+				   mask & (MAY_READ | MAY_WRITE |
+					   MAY_EXEC | MAY_OPENEXEC |
 					   MAY_APPEND), FILE_CHECK);
 }
 EXPORT_SYMBOL_GPL(ima_file_check);
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e493063a3c34..6487f0b2afdd 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -406,7 +406,8 @@ static bool ima_match_keyring(struct ima_rule_entry *rule,
  * @cred: a pointer to a credentials structure for user validation
  * @secid: the secid of the task to be validated
  * @func: LIM hook identifier
- * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
+ * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC |
+ *			    MAY_OPENEXEC)
  * @keyring: keyring name to check in policy for KEY_CHECK func
  *
  * Returns true on rule match, false on failure.
@@ -527,7 +528,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
  *        being made
  * @secid: LSM secid of the task to be validated
  * @func: IMA hook identifier
- * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
+ * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC |
+ *			    MAY_OPENEXEC)
  * @pcr: set the pcr to extend
  * @template_desc: the template that should be used for this rule
  * @keyring: the keyring name, if given, to be used to check in the policy.
@@ -1091,6 +1093,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 				entry->mask = MAY_READ;
 			else if (strcmp(from, "MAY_APPEND") == 0)
 				entry->mask = MAY_APPEND;
+			else if (strcmp(from, "MAY_OPENEXEC") == 0)
+				entry->mask = MAY_OPENEXEC;
 			else
 				result = -EINVAL;
 			if (!result)
@@ -1422,14 +1426,15 @@ const char *const func_tokens[] = {
 
 #ifdef	CONFIG_IMA_READ_POLICY
 enum {
-	mask_exec = 0, mask_write, mask_read, mask_append
+	mask_exec = 0, mask_write, mask_read, mask_append, mask_openexec
 };
 
 static const char *const mask_tokens[] = {
 	"^MAY_EXEC",
 	"^MAY_WRITE",
 	"^MAY_READ",
-	"^MAY_APPEND"
+	"^MAY_APPEND",
+	"^MAY_OPENEXEC"
 };
 
 void *ima_policy_start(struct seq_file *m, loff_t *pos)
@@ -1518,6 +1523,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 			seq_printf(m, pt(Opt_mask), mt(mask_read) + offset);
 		if (entry->mask & MAY_APPEND)
 			seq_printf(m, pt(Opt_mask), mt(mask_append) + offset);
+		if (entry->mask & MAY_OPENEXEC)
+			seq_printf(m, pt(Opt_mask), mt(mask_openexec) + offset);
 		seq_puts(m, " ");
 	}
 
-- 
2.27.0


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23 17:12 [PATCH v7 0/7] Add support for O_MAYEXEC Mickaël Salaün
2020-07-23 17:12 ` [PATCH v7 1/7] exec: Change uselib(2) IS_SREG() failure to EACCES Mickaël Salaün
2020-08-11 18:59   ` Eric W. Biederman
2020-08-11 19:14     ` Eric W. Biederman
2020-07-23 17:12 ` [PATCH v7 2/7] exec: Move S_ISREG() check earlier Mickaël Salaün
2020-08-11 19:27   ` Eric W. Biederman
2020-07-23 17:12 ` [PATCH v7 3/7] exec: Move path_noexec() " Mickaël Salaün
2020-08-11 19:36   ` Eric W. Biederman
2020-08-13 15:31     ` Mickaël Salaün
2020-07-23 17:12 ` [PATCH v7 4/7] fs: Introduce O_MAYEXEC flag for openat2(2) Mickaël Salaün
2020-07-24 19:03   ` Kees Cook
2020-07-27  4:21   ` Al Viro
2020-07-27  5:27     ` Florian Weimer
2020-07-27 19:46       ` Mickaël Salaün
2020-08-11 19:51   ` Eric W. Biederman
2020-08-13 14:36     ` Mickaël Salaün
2020-07-23 17:12 ` [PATCH v7 5/7] fs,doc: Enable to enforce noexec mounts or file exec through O_MAYEXEC Mickaël Salaün
2020-07-24 19:03   ` Kees Cook
2020-08-11 19:58   ` Eric W. Biederman
2020-08-13 14:49     ` Mickaël Salaün
2020-07-23 17:12 ` [PATCH v7 6/7] selftest/openat2: Add tests for O_MAYEXEC enforcing Mickaël Salaün
2020-07-24 19:03   ` Kees Cook
2020-07-23 17:12 ` Mickaël Salaün [this message]
2020-07-24 19:04   ` [PATCH v7 7/7] ima: add policy support for the new file open MAY_OPENEXEC flag Kees Cook
2020-07-24 11:20 ` [PATCH v7 0/7] Add support for O_MAYEXEC Thibaut Sautereau
2020-07-24 19:06 ` Kees Cook
2020-07-25 11:15   ` Christian Brauner
2020-08-10 20:11   ` Mickaël Salaün
2020-08-10 20:21     ` Al Viro
2020-08-10 22:09       ` David Laight
2020-08-10 22:28         ` Al Viro
2020-08-10 22:47           ` Mickaël Salaün
2020-08-11  8:09             ` David Laight
2020-08-11  8:50               ` Mickaël Salaün
2020-08-10 22:43       ` Mickaël Salaün
2020-08-10 23:03         ` Jann Horn
2020-08-11  8:48           ` Mickaël Salaün
2020-08-11 13:56             ` Mimi Zohar
2020-08-11 14:02               ` Matthew Wilcox
2020-08-11 14:30                 ` Mimi Zohar
2020-08-11 17:18             ` Deven Bowers
2020-08-10 23:05         ` Al Viro
2020-08-11  8:49           ` Mickaël Salaün

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200723171227.446711-8-mic@digikod.net \
    --to=mic@digikod.net \
    --cc=akpm@linux-foundation.org \
    --cc=ast@kernel.org \
    --cc=christian.brauner@ubuntu.com \
    --cc=christian@python.org \
    --cc=corbet@lwn.net \
    --cc=cyphar@cyphar.com \
    --cc=daniel@iogearbox.net \
    --cc=deven.desai@linux.microsoft.com \
    --cc=dvyukov@google.com \
    --cc=ebiggers@kernel.org \
    --cc=ericchiang@google.com \
    --cc=fweimer@redhat.com \
    --cc=jack@suse.cz \
    --cc=jannh@google.com \
    --cc=jmorris@namei.org \
    --cc=keescook@chromium.org \
    --cc=kernel-hardening@lists.openwall.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=mjg59@google.com \
    --cc=mtk.manpages@gmail.com \
    --cc=nramas@linux.microsoft.com \
    --cc=penguin-kernel@I-love.SAKURA.ne.jp \
    --cc=philippe.trebuchet@ssi.gouv.fr \
    --cc=scottsh@microsoft.com \
    --cc=sean.j.christopherson@intel.com \
    --cc=sgrubb@redhat.com \
    --cc=shuah@kernel.org \
    --cc=steve.dower@python.org \
    --cc=thibaut.sautereau@clip-os.org \
    --cc=vincent.strubel@ssi.gouv.fr \
    --cc=viro@zeniv.linux.org.uk \
    --cc=willy@infradead.org \
    --cc=zohar@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git