Linux-Security-Module 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>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Christian Heimes" <christian@python.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Deven Bowers" <deven.desai@linux.microsoft.com>,
	"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>,
	"Mickaël Salaün" <mickael.salaun@ssi.gouv.fr>,
	"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>,
	"Thibaut Sautereau" <thibaut.sautereau@ssi.gouv.fr>,
	"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 v5 4/6] selftest/openat2: Add tests for O_MAYEXEC enforcing
Date: Tue,  5 May 2020 17:31:54 +0200
Message-ID: <20200505153156.925111-5-mic@digikod.net> (raw)
In-Reply-To: <20200505153156.925111-1-mic@digikod.net>

Test propagation of noexec mount points or file executability through
files open with or without O_MAYEXEC, thanks to the
fs.open_mayexec_enforce sysctl.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Reviewed-by: Thibaut Sautereau <thibaut.sautereau@ssi.gouv.fr>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Cc: Shuah Khan <shuah@kernel.org>
---

Changes since v3:
* Replace RESOLVE_MAYEXEC with O_MAYEXEC.
* Add tests to check that O_MAYEXEC is ignored by open(2) and openat(2).

Changes since v2:
* Move tests from exec/ to openat2/ .
* Replace O_MAYEXEC with RESOLVE_MAYEXEC from openat2(2).
* Cleanup tests.

Changes since v1:
* Move tests from yama/ to exec/ .
* Fix _GNU_SOURCE in kselftest_harness.h .
* Add a new test sysctl_access_write to check if CAP_MAC_ADMIN is taken
  into account.
* Test directory execution which is always forbidden since commit
  73601ea5b7b1 ("fs/open.c: allow opening only regular files during
  execve()"), and also check that even the root user can not bypass file
  execution checks.
* Make sure delete_workspace() always as enough right to succeed.
* Cosmetic cleanup.
---
 tools/testing/selftests/kselftest_harness.h   |   3 +
 tools/testing/selftests/openat2/Makefile      |   3 +-
 tools/testing/selftests/openat2/config        |   1 +
 tools/testing/selftests/openat2/helpers.h     |   1 +
 .../testing/selftests/openat2/omayexec_test.c | 330 ++++++++++++++++++
 5 files changed, 337 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/openat2/config
 create mode 100644 tools/testing/selftests/openat2/omayexec_test.c

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 2bb8c81fc0b4..f6e056ba4a13 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -50,7 +50,10 @@
 #ifndef __KSELFTEST_HARNESS_H
 #define __KSELFTEST_HARNESS_H
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
+
 #include <asm/types.h>
 #include <errno.h>
 #include <stdbool.h>
diff --git a/tools/testing/selftests/openat2/Makefile b/tools/testing/selftests/openat2/Makefile
index 4b93b1417b86..cb98bdb4d5b1 100644
--- a/tools/testing/selftests/openat2/Makefile
+++ b/tools/testing/selftests/openat2/Makefile
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
-TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test
+LDLIBS += -lcap
+TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test omayexec_test
 
 include ../lib.mk
 
diff --git a/tools/testing/selftests/openat2/config b/tools/testing/selftests/openat2/config
new file mode 100644
index 000000000000..dd53c266bf52
--- /dev/null
+++ b/tools/testing/selftests/openat2/config
@@ -0,0 +1 @@
+CONFIG_SYSCTL=y
diff --git a/tools/testing/selftests/openat2/helpers.h b/tools/testing/selftests/openat2/helpers.h
index a6ea27344db2..1dcd3e1e2f38 100644
--- a/tools/testing/selftests/openat2/helpers.h
+++ b/tools/testing/selftests/openat2/helpers.h
@@ -9,6 +9,7 @@
 
 #define _GNU_SOURCE
 #include <stdint.h>
+#include <stdbool.h>
 #include <errno.h>
 #include <linux/types.h>
 #include "../kselftest.h"
diff --git a/tools/testing/selftests/openat2/omayexec_test.c b/tools/testing/selftests/openat2/omayexec_test.c
new file mode 100644
index 000000000000..7052c852daf8
--- /dev/null
+++ b/tools/testing/selftests/openat2/omayexec_test.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test O_MAYEXEC
+ *
+ * Copyright © 2018-2020 ANSSI
+ *
+ * Author: Mickaël Salaün <mic@digikod.net>
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/capability.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "helpers.h"
+#include "../kselftest_harness.h"
+
+#ifndef O_MAYEXEC
+#define O_MAYEXEC		040000000
+#endif
+
+#define SYSCTL_MAYEXEC	"/proc/sys/fs/open_mayexec_enforce"
+
+#define BIN_DIR		"./test-mount"
+#define BIN_PATH	BIN_DIR "/file"
+#define DIR_PATH	BIN_DIR "/directory"
+
+#define ALLOWED		1
+#define DENIED		0
+
+static void ignore_dac(struct __test_metadata *_metadata, int override)
+{
+	cap_t caps;
+	const cap_value_t cap_val[2] = {
+		CAP_DAC_OVERRIDE,
+		CAP_DAC_READ_SEARCH,
+	};
+
+	caps = cap_get_proc();
+	ASSERT_NE(NULL, caps);
+	ASSERT_EQ(0, cap_set_flag(caps, CAP_EFFECTIVE, 2, cap_val,
+				override ? CAP_SET : CAP_CLEAR));
+	ASSERT_EQ(0, cap_set_proc(caps));
+	EXPECT_EQ(0, cap_free(caps));
+}
+
+static void ignore_mac(struct __test_metadata *_metadata, int override)
+{
+	cap_t caps;
+	const cap_value_t cap_val[1] = {
+		CAP_MAC_ADMIN,
+	};
+
+	caps = cap_get_proc();
+	ASSERT_NE(NULL, caps);
+	ASSERT_EQ(0, cap_set_flag(caps, CAP_EFFECTIVE, 1, cap_val,
+				override ? CAP_SET : CAP_CLEAR));
+	ASSERT_EQ(0, cap_set_proc(caps));
+	EXPECT_EQ(0, cap_free(caps));
+}
+
+static void test_omx(struct __test_metadata *_metadata,
+		const char *const path, const int exec_allowed)
+{
+	struct open_how how = {
+		.flags = O_RDONLY | O_CLOEXEC,
+	};
+	int fd;
+
+	/* Opens without O_MAYEXEC. */
+	fd = sys_openat2(AT_FDCWD, path, &how);
+	ASSERT_LE(0, fd);
+	EXPECT_EQ(0, close(fd));
+
+	how.flags |= O_MAYEXEC;
+
+	/* Checks that O_MAYEXEC is ignored with open(2). */
+	fd = open(path, how.flags);
+	ASSERT_LE(0, fd);
+	EXPECT_EQ(0, close(fd));
+
+	/* Checks that O_MAYEXEC is ignored with openat(2). */
+	fd = openat(AT_FDCWD, path, how.flags);
+	ASSERT_LE(0, fd);
+	EXPECT_EQ(0, close(fd));
+
+	/* Opens with O_MAYEXEC. */
+	fd = sys_openat2(AT_FDCWD, path, &how);
+	if (exec_allowed) {
+		ASSERT_LE(0, fd);
+		EXPECT_EQ(0, close(fd));
+	} else {
+		ASSERT_EQ(-EACCES, fd);
+	}
+}
+
+static void test_omx_dir_file(struct __test_metadata *_metadata,
+		const char *const dir_path, const char *const file_path,
+		const int exec_allowed)
+{
+	/*
+	 * Directory execution is always denied since commit 73601ea5b7b1
+	 * ("fs/open.c: allow opening only regular files during execve()").
+	 */
+	test_omx(_metadata, dir_path, DENIED);
+	test_omx(_metadata, file_path, exec_allowed);
+}
+
+static void test_dir_file(struct __test_metadata *_metadata,
+		const char *const dir_path, const char *const file_path,
+		const int exec_allowed)
+{
+	/* Tests as root. */
+	ignore_dac(_metadata, 1);
+	test_omx_dir_file(_metadata, dir_path, file_path, exec_allowed);
+
+	/* Tests without bypass. */
+	ignore_dac(_metadata, 0);
+	test_omx_dir_file(_metadata, dir_path, file_path, exec_allowed);
+}
+
+static void sysctl_write(struct __test_metadata *_metadata,
+		const char *path, const char *value)
+{
+	int fd;
+	size_t len_value;
+	ssize_t len_wrote;
+
+	fd = open(path, O_WRONLY | O_CLOEXEC);
+	ASSERT_LE(0, fd);
+	len_value = strlen(value);
+	len_wrote = write(fd, value, len_value);
+	ASSERT_EQ(len_wrote, len_value);
+	EXPECT_EQ(0, close(fd));
+}
+
+static void create_workspace(struct __test_metadata *_metadata,
+		int mount_exec, int file_exec)
+{
+	int fd;
+
+	/*
+	 * Cleans previous workspace if any error previously happened (don't
+	 * check errors).
+	 */
+	umount(BIN_DIR);
+	rmdir(BIN_DIR);
+
+	/* Creates a clean mount point. */
+	ASSERT_EQ(0, mkdir(BIN_DIR, 00700));
+	ASSERT_EQ(0, mount("test", BIN_DIR, "tmpfs",
+				MS_MGC_VAL | (mount_exec ? 0 : MS_NOEXEC),
+				"mode=0700,size=4k"));
+
+	/* Creates a test file. */
+	fd = open(BIN_PATH, O_CREAT | O_RDONLY | O_CLOEXEC,
+			file_exec ? 00500 : 00400);
+	ASSERT_LE(0, fd);
+	EXPECT_EQ(0, close(fd));
+
+	/* Creates a test directory. */
+	ASSERT_EQ(0, mkdir(DIR_PATH, file_exec ? 00500 : 00400));
+}
+
+static void delete_workspace(struct __test_metadata *_metadata)
+{
+	ignore_mac(_metadata, 1);
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "0");
+
+	/* There is no need to unlink BIN_PATH nor DIR_PATH. */
+	ASSERT_EQ(0, umount(BIN_DIR));
+	ASSERT_EQ(0, rmdir(BIN_DIR));
+}
+
+FIXTURE_DATA(mount_exec_file_exec) { };
+
+FIXTURE_SETUP(mount_exec_file_exec)
+{
+	create_workspace(_metadata, 1, 1);
+}
+
+FIXTURE_TEARDOWN(mount_exec_file_exec)
+{
+	delete_workspace(_metadata);
+}
+
+TEST_F(mount_exec_file_exec, mount)
+{
+	/* Enforces mount exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "1");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, ALLOWED);
+}
+
+TEST_F(mount_exec_file_exec, file)
+{
+	/* Enforces file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "2");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, ALLOWED);
+}
+
+TEST_F(mount_exec_file_exec, mount_file)
+{
+	/* Enforces mount and file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "3");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, ALLOWED);
+}
+
+FIXTURE_DATA(mount_exec_file_noexec) { };
+
+FIXTURE_SETUP(mount_exec_file_noexec)
+{
+	create_workspace(_metadata, 1, 0);
+}
+
+FIXTURE_TEARDOWN(mount_exec_file_noexec)
+{
+	delete_workspace(_metadata);
+}
+
+TEST_F(mount_exec_file_noexec, mount)
+{
+	/* Enforces mount exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "1");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, ALLOWED);
+}
+
+TEST_F(mount_exec_file_noexec, file)
+{
+	/* Enforces file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "2");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+TEST_F(mount_exec_file_noexec, mount_file)
+{
+	/* Enforces mount and file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "3");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+FIXTURE_DATA(mount_noexec_file_exec) { };
+
+FIXTURE_SETUP(mount_noexec_file_exec)
+{
+	create_workspace(_metadata, 0, 1);
+}
+
+FIXTURE_TEARDOWN(mount_noexec_file_exec)
+{
+	delete_workspace(_metadata);
+}
+
+TEST_F(mount_noexec_file_exec, mount)
+{
+	/* Enforces mount exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "1");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+TEST_F(mount_noexec_file_exec, file)
+{
+	/* Enforces file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "2");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, ALLOWED);
+}
+
+TEST_F(mount_noexec_file_exec, mount_file)
+{
+	/* Enforces mount and file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "3");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+FIXTURE_DATA(mount_noexec_file_noexec) { };
+
+FIXTURE_SETUP(mount_noexec_file_noexec)
+{
+	create_workspace(_metadata, 0, 0);
+}
+
+FIXTURE_TEARDOWN(mount_noexec_file_noexec)
+{
+	delete_workspace(_metadata);
+}
+
+TEST_F(mount_noexec_file_noexec, mount)
+{
+	/* Enforces mount exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "1");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+TEST_F(mount_noexec_file_noexec, file)
+{
+	/* Enforces file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "2");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+TEST_F(mount_noexec_file_noexec, mount_file)
+{
+	/* Enforces mount and file exec check. */
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "3");
+	test_dir_file(_metadata, DIR_PATH, BIN_PATH, DENIED);
+}
+
+TEST(sysctl_access_write)
+{
+	int fd;
+	ssize_t len_wrote;
+
+	ignore_mac(_metadata, 1);
+	sysctl_write(_metadata, SYSCTL_MAYEXEC, "0");
+
+	ignore_mac(_metadata, 0);
+	fd = open(SYSCTL_MAYEXEC, O_WRONLY | O_CLOEXEC);
+	ASSERT_LE(0, fd);
+	len_wrote = write(fd, "0", 1);
+	ASSERT_EQ(len_wrote, -1);
+	EXPECT_EQ(0, close(fd));
+
+	ignore_mac(_metadata, 1);
+}
+
+TEST_HARNESS_MAIN
-- 
2.26.2


  parent reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-05 15:31 [PATCH v5 0/6] Add support for O_MAYEXEC Mickaël Salaün
2020-05-05 15:31 ` [PATCH v5 1/6] fs: Add support for an O_MAYEXEC flag on openat2(2) Mickaël Salaün
2020-05-12 21:05   ` Kees Cook
2020-05-12 21:40     ` Christian Heimes
2020-05-12 22:56       ` Kees Cook
2020-05-13 10:13     ` Mickaël Salaün
2020-05-05 15:31 ` [PATCH v5 2/6] fs: Add a MAY_EXECMOUNT flag to infer the noexec mount property Mickaël Salaün
2020-05-12 21:09   ` Kees Cook
2020-05-14  8:14     ` Lev R. Oshvang .
2020-05-14 15:48       ` Kees Cook
2020-05-17 16:57         ` Lev R. Oshvang .
2020-05-05 15:31 ` [PATCH v5 3/6] fs: Enable to enforce noexec mounts or file exec through O_MAYEXEC Mickaël Salaün
2020-05-05 15:44   ` Randy Dunlap
2020-05-05 16:55     ` Mickaël Salaün
2020-05-05 17:40       ` Randy Dunlap
2020-05-12 21:48   ` Kees Cook
2020-05-13 11:09     ` Mickaël Salaün
2020-05-13 15:37   ` Stephen Smalley
2020-05-13 23:27     ` Kees Cook
2020-05-14  3:05       ` Kees Cook
2020-05-14 10:12         ` David Laight
2020-05-14 12:22         ` Stephen Smalley
2020-05-14 14:41           ` Kees Cook
2020-05-14 15:52             ` Stephen Smalley
2020-05-14 15:45           ` Kees Cook
2020-05-14 16:10             ` Stephen Smalley
2020-05-14 19:16               ` Mickaël Salaün
2020-05-15  0:58                 ` Tetsuo Handa
2020-05-15  8:01                 ` How about just O_EXEC? (was Re: [PATCH v5 3/6] fs: Enable to enforce noexec mounts or file exec through O_MAYEXEC) Kees Cook
2020-05-15  8:43                   ` Florian Weimer
2020-05-15 14:37                     ` Kees Cook
2020-05-15 14:43                       ` Florian Weimer
2020-05-15 15:50                         ` Kees Cook
2020-05-18  7:26                           ` Florian Weimer
2020-05-19  2:23                           ` Aleksa Sarai
2020-05-19 10:13                             ` Mickaël Salaün
2020-05-15 11:04                   ` Mickaël Salaün
2020-05-15 15:46                     ` Kees Cook
2020-05-15 18:24                       ` Mickaël Salaün
2020-05-14 19:21       ` [PATCH v5 3/6] fs: Enable to enforce noexec mounts or file exec through O_MAYEXEC Mickaël Salaün
2020-05-05 15:31 ` Mickaël Salaün [this message]
2020-05-12 21:57   ` [PATCH v5 4/6] selftest/openat2: Add tests for O_MAYEXEC enforcing Kees Cook
2020-05-13 11:18     ` Mickaël Salaün
2020-05-05 15:31 ` [PATCH v5 5/6] doc: Add documentation for the fs.open_mayexec_enforce sysctl Mickaël Salaün
2020-05-12 22:00   ` Kees Cook
2020-05-13 11:20     ` Mickaël Salaün
2020-05-05 15:31 ` [PATCH v5 6/6] ima: add policy support for the new file open MAY_OPENEXEC flag Mickaël Salaün
2020-05-05 15:36 ` [PATCH v5 0/6] Add support for O_MAYEXEC Mickaël Salaün
2020-05-06 13:58   ` Lev R. Oshvang .
2020-05-06 15:41     ` Aleksa Sarai
2020-05-07  8:30     ` Mickaël Salaün
2020-05-07  8:05 ` David Laight
2020-05-07  8:36   ` Mickaël Salaün
2020-05-07  9:00     ` David Laight
2020-05-07  9:30       ` Mickaël Salaün
2020-05-07  9:44         ` David Laight
2020-05-07 13:38           ` Mickaël Salaün
2020-05-08  7:15             ` Lev R. Oshvang .
2020-05-08 14:01               ` Mimi Zohar

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=20200505153156.925111-5-mic@digikod.net \
    --to=mic@digikod.net \
    --cc=ast@kernel.org \
    --cc=christian@python.org \
    --cc=corbet@lwn.net \
    --cc=cyphar@cyphar.com \
    --cc=daniel@iogearbox.net \
    --cc=deven.desai@linux.microsoft.com \
    --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=mickael.salaun@ssi.gouv.fr \
    --cc=mjg59@google.com \
    --cc=mtk.manpages@gmail.com \
    --cc=nramas@linux.microsoft.com \
    --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@ssi.gouv.fr \
    --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

Linux-Security-Module Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-security-module/0 linux-security-module/git/0.git

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

Example config snippet for mirrors

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


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