[PATCH v1 0/8] LSM: Two basic syscalls

[PATCH v1 0/8] LSM: Two basic syscalls

[Casey Schaufler]

Add two system calls for the Linux Security Module ABI.

lsm_self_attr() provides the security module specific attributes
that have previously been visible in the /proc/self/attr directory.
For each attribute that is set on the current process the system
call will return an LSM identifier, an attribute identifier and
the value of the attribute. The LSM and attribute identifier values
are defined in include/uapi/linux/lsm.h

lsm_module_list() provides the LSM identifiers, in order, of the
security modules that are active on the system. This has been
available in the securityfs file /sys/kernel/security/lsm.

Patch 0001 changes the LSM registration from passing the name
of the module to passing a lsm_id structure that contains the
name of the module.
Patch 0002 adds an LSM identifier number to the lsm_id structure.
Patch 0003 adds an attribute identifier to the lsm_id.
Patch 0004 adds the registered lsm_ids to a table.
Patch 0005 changes security_[gs]etprocattr() to use LSM IDs instead
of LSM names.
Patch 0006 implements lsm_self_attr().
Patch 0007 implements lsm_module_list().
Patch 0008 wires up the two syscalls.

Casey Schaufler (8):
  LSM: Identify modules by more than name
  LSM: Add an LSM identifier for external use
  LSM: Identify the process attributes for each module
  LSM: Maintain a table of LSM attribute data
  proc: Use lsmids instead of lsm names for attrs
  LSM: lsm_self_attr syscall for LSM self attributes
  LSM: Create lsm_module_list system call
  lsm: wireup syscalls lsm_self_attr and lsm_module_list

 arch/alpha/kernel/syscalls/syscall.tbl        |   2 +
 arch/arm/tools/syscall.tbl                    |   2 +
 arch/arm64/include/asm/unistd32.h             |   2 +
 arch/ia64/kernel/syscalls/syscall.tbl         |   2 +
 arch/m68k/kernel/syscalls/syscall.tbl         |   2 +
 arch/microblaze/kernel/syscalls/syscall.tbl   |   2 +
 arch/mips/kernel/syscalls/syscall_n32.tbl     |   2 +
 arch/mips/kernel/syscalls/syscall_n64.tbl     |   2 +
 arch/mips/kernel/syscalls/syscall_o32.tbl     |   2 +
 arch/parisc/kernel/syscalls/syscall.tbl       |   2 +
 arch/powerpc/kernel/syscalls/syscall.tbl      |   2 +
 arch/s390/kernel/syscalls/syscall.tbl         |   2 +
 arch/sh/kernel/syscalls/syscall.tbl           |   2 +
 arch/sparc/kernel/syscalls/syscall.tbl        |   2 +
 arch/x86/entry/syscalls/syscall_32.tbl        |   2 +
 arch/x86/entry/syscalls/syscall_64.tbl        |   2 +
 arch/xtensa/kernel/syscalls/syscall.tbl       |   2 +
 fs/proc/base.c                                |  29 +--
 fs/proc/internal.h                            |   2 +-
 include/linux/lsm_hooks.h                     |  13 +-
 include/linux/security.h                      |  28 ++-
 include/linux/syscalls.h                      |   3 +
 include/uapi/asm-generic/unistd.h             |   5 +-
 include/uapi/linux/lsm.h                      |  67 ++++++
 kernel/sys_ni.c                               |   4 +
 security/Makefile                             |   1 +
 security/apparmor/lsm.c                       |   9 +-
 security/bpf/hooks.c                          |  13 +-
 security/commoncap.c                          |   8 +-
 security/landlock/cred.c                      |   2 +-
 security/landlock/fs.c                        |   2 +-
 security/landlock/ptrace.c                    |   2 +-
 security/landlock/setup.c                     |   6 +
 security/landlock/setup.h                     |   1 +
 security/loadpin/loadpin.c                    |   9 +-
 security/lockdown/lockdown.c                  |   8 +-
 security/lsm_syscalls.c                       | 194 ++++++++++++++++++
 security/safesetid/lsm.c                      |   9 +-
 security/security.c                           |  37 +++-
 security/selinux/hooks.c                      |  11 +-
 security/smack/smack_lsm.c                    |   9 +-
 security/tomoyo/tomoyo.c                      |   9 +-
 security/yama/yama_lsm.c                      |   8 +-
 .../arch/mips/entry/syscalls/syscall_n64.tbl  |   2 +
 .../arch/powerpc/entry/syscalls/syscall.tbl   |   2 +
 .../perf/arch/s390/entry/syscalls/syscall.tbl |   2 +
 .../arch/x86/entry/syscalls/syscall_64.tbl    |   2 +
 47 files changed, 484 insertions(+), 47 deletions(-)
 create mode 100644 include/uapi/linux/lsm.h
 create mode 100644 security/lsm_syscalls.c


base-commit: 247f34f7b80357943234f93f247a1ae6b6c3a740
-- 
2.37.3

[PATCH v1 1/8] LSM: Identify modules by more than name

[Casey Schaufler]

Create a struct lsm_id to contain identifying information
about Linux Security Modules (LSMs). At inception this contains
a single member, which is the name of the module. Change the
security_add_hooks() interface to use this structure. Change
the individual modules to maintain their own struct lsm_id and
pass it to security_add_hooks().

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h    | 11 +++++++++--
 security/apparmor/lsm.c      |  6 +++++-
 security/bpf/hooks.c         | 11 ++++++++++-
 security/commoncap.c         |  6 +++++-
 security/landlock/cred.c     |  2 +-
 security/landlock/fs.c       |  2 +-
 security/landlock/ptrace.c   |  2 +-
 security/landlock/setup.c    |  4 ++++
 security/landlock/setup.h    |  1 +
 security/loadpin/loadpin.c   |  7 ++++++-
 security/lockdown/lockdown.c |  6 +++++-
 security/safesetid/lsm.c     |  7 ++++++-
 security/security.c          | 12 ++++++------
 security/selinux/hooks.c     |  7 ++++++-
 security/smack/smack_lsm.c   |  6 +++++-
 security/tomoyo/tomoyo.c     |  7 ++++++-
 security/yama/yama_lsm.c     |  6 +++++-
 17 files changed, 82 insertions(+), 21 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 4ec80b96c22e..e383e468f742 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1602,6 +1602,13 @@ struct security_hook_heads {
 	#undef LSM_HOOK
 } __randomize_layout;
 
+/*
+ * Information that identifies a security module.
+ */
+struct lsm_id {
+	const char	*lsm;		/* Name of the LSM */
+};
+
 /*
  * Security module hook list structure.
  * For use with generic list macros for common operations.
@@ -1610,7 +1617,7 @@ struct security_hook_list {
 	struct hlist_node		list;
 	struct hlist_head		*head;
 	union security_list_options	hook;
-	const char			*lsm;
+	struct lsm_id			*lsmid;
 } __randomize_layout;
 
 /*
@@ -1645,7 +1652,7 @@ extern struct security_hook_heads security_hook_heads;
 extern char *lsm_names;
 
 extern void security_add_hooks(struct security_hook_list *hooks, int count,
-				const char *lsm);
+			       struct lsm_id *lsmid);
 
 #define LSM_FLAG_LEGACY_MAJOR	BIT(0)
 #define LSM_FLAG_EXCLUSIVE	BIT(1)
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index f56070270c69..e708c1ad7267 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1202,6 +1202,10 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
 	.lbs_task = sizeof(struct aa_task_ctx),
 };
 
+static struct lsm_id apparmor_lsmid __lsm_ro_after_init = {
+	.lsm = "apparmor",
+};
+
 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
 	LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
@@ -1897,7 +1901,7 @@ static int __init apparmor_init(void)
 		goto buffers_out;
 	}
 	security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
-				"apparmor");
+				&apparmor_lsmid);
 
 	/* Report that AppArmor successfully initialized */
 	apparmor_initialized = 1;
diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c
index e5971fa74fd7..ef9b1d983665 100644
--- a/security/bpf/hooks.c
+++ b/security/bpf/hooks.c
@@ -15,9 +15,18 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(task_free, bpf_task_storage_free),
 };
 
+/*
+ * slot has to be LSMBLOB_NEEDED because some of the hooks
+ * supplied by this module require a slot.
+ */
+struct lsm_id bpf_lsmid __lsm_ro_after_init = {
+	.lsm = "bpf",
+};
+
 static int __init bpf_lsm_init(void)
 {
-	security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf");
+	security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks),
+			   &bpf_lsmid);
 	pr_info("LSM support for eBPF active\n");
 	return 0;
 }
diff --git a/security/commoncap.c b/security/commoncap.c
index 5fc8986c3c77..986920da0c26 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -1446,6 +1446,10 @@ int cap_mmap_file(struct file *file, unsigned long reqprot,
 
 #ifdef CONFIG_SECURITY
 
+static struct lsm_id capability_lsmid __lsm_ro_after_init = {
+	.lsm = "capability",
+};
+
 static struct security_hook_list capability_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(capable, cap_capable),
 	LSM_HOOK_INIT(settime, cap_settime),
@@ -1470,7 +1474,7 @@ static struct security_hook_list capability_hooks[] __lsm_ro_after_init = {
 static int __init capability_init(void)
 {
 	security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks),
-				"capability");
+			   &capability_lsmid);
 	return 0;
 }
 
diff --git a/security/landlock/cred.c b/security/landlock/cred.c
index ec6c37f04a19..2eb1d65f10d6 100644
--- a/security/landlock/cred.c
+++ b/security/landlock/cred.c
@@ -42,5 +42,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
 __init void landlock_add_cred_hooks(void)
 {
 	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
-			   LANDLOCK_NAME);
+			   &landlock_lsmid);
 }
diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 64ed7665455f..486ff50d54a1 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -1201,5 +1201,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
 __init void landlock_add_fs_hooks(void)
 {
 	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
-			   LANDLOCK_NAME);
+			   &landlock_lsmid);
 }
diff --git a/security/landlock/ptrace.c b/security/landlock/ptrace.c
index 4c5b9cd71286..eab35808f395 100644
--- a/security/landlock/ptrace.c
+++ b/security/landlock/ptrace.c
@@ -116,5 +116,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
 __init void landlock_add_ptrace_hooks(void)
 {
 	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
-			   LANDLOCK_NAME);
+			   &landlock_lsmid);
 }
diff --git a/security/landlock/setup.c b/security/landlock/setup.c
index f8e8e980454c..4a12666a4090 100644
--- a/security/landlock/setup.c
+++ b/security/landlock/setup.c
@@ -23,6 +23,10 @@ struct lsm_blob_sizes landlock_blob_sizes __lsm_ro_after_init = {
 	.lbs_superblock = sizeof(struct landlock_superblock_security),
 };
 
+struct lsm_id landlock_lsmid __lsm_ro_after_init = {
+	.lsm = LANDLOCK_NAME,
+};
+
 static int __init landlock_init(void)
 {
 	landlock_add_cred_hooks();
diff --git a/security/landlock/setup.h b/security/landlock/setup.h
index 1daffab1ab4b..38bce5b172dc 100644
--- a/security/landlock/setup.h
+++ b/security/landlock/setup.h
@@ -14,5 +14,6 @@
 extern bool landlock_initialized;
 
 extern struct lsm_blob_sizes landlock_blob_sizes;
+extern struct lsm_id landlock_lsmid;
 
 #endif /* _SECURITY_LANDLOCK_SETUP_H */
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index de41621f4998..24d041a888b8 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -197,6 +197,10 @@ static int loadpin_load_data(enum kernel_load_data_id id, bool contents)
 	return loadpin_read_file(NULL, (enum kernel_read_file_id) id, contents);
 }
 
+static struct lsm_id loadpin_lsmid __lsm_ro_after_init = {
+	.lsm = "loadpin",
+};
+
 static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(sb_free_security, loadpin_sb_free_security),
 	LSM_HOOK_INIT(kernel_read_file, loadpin_read_file),
@@ -244,7 +248,8 @@ static int __init loadpin_init(void)
 	pr_info("ready to pin (currently %senforcing)\n",
 		enforce ? "" : "not ");
 	parse_exclude();
-	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin");
+	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks),
+			   &loadpin_lsmid);
 
 	return 0;
 }
diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index a79b985e917e..2004d67f7201 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -75,6 +75,10 @@ static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(locked_down, lockdown_is_locked_down),
 };
 
+static struct lsm_id lockdown_lsmid __lsm_ro_after_init = {
+	.lsm = "lockdown",
+};
+
 static int __init lockdown_lsm_init(void)
 {
 #if defined(CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY)
@@ -83,7 +87,7 @@ static int __init lockdown_lsm_init(void)
 	lock_kernel_down("Kernel configuration", LOCKDOWN_CONFIDENTIALITY_MAX);
 #endif
 	security_add_hooks(lockdown_hooks, ARRAY_SIZE(lockdown_hooks),
-			   "lockdown");
+			   &lockdown_lsmid);
 	return 0;
 }
 
diff --git a/security/safesetid/lsm.c b/security/safesetid/lsm.c
index e806739f7868..d9af1d04d293 100644
--- a/security/safesetid/lsm.c
+++ b/security/safesetid/lsm.c
@@ -261,6 +261,10 @@ static int safesetid_task_fix_setgroups(struct cred *new, const struct cred *old
 	return 0;
 }
 
+static struct lsm_id safesetid_lsmid __lsm_ro_after_init = {
+	.lsm = "safesetid",
+};
+
 static struct security_hook_list safesetid_security_hooks[] = {
 	LSM_HOOK_INIT(task_fix_setuid, safesetid_task_fix_setuid),
 	LSM_HOOK_INIT(task_fix_setgid, safesetid_task_fix_setgid),
@@ -271,7 +275,8 @@ static struct security_hook_list safesetid_security_hooks[] = {
 static int __init safesetid_security_init(void)
 {
 	security_add_hooks(safesetid_security_hooks,
-			   ARRAY_SIZE(safesetid_security_hooks), "safesetid");
+			   ARRAY_SIZE(safesetid_security_hooks),
+			   &safesetid_lsmid);
 
 	/* Report that SafeSetID successfully initialized */
 	safesetid_initialized = 1;
diff --git a/security/security.c b/security/security.c
index 79d82cb6e469..b2eb0ccd954b 100644
--- a/security/security.c
+++ b/security/security.c
@@ -476,17 +476,17 @@ static int lsm_append(const char *new, char **result)
  * security_add_hooks - Add a modules hooks to the hook lists.
  * @hooks: the hooks to add
  * @count: the number of hooks to add
- * @lsm: the name of the security module
+ * @lsmid: the identification information for the security module
  *
  * Each LSM has to register its hooks with the infrastructure.
  */
 void __init security_add_hooks(struct security_hook_list *hooks, int count,
-				const char *lsm)
+			       struct lsm_id *lsmid)
 {
 	int i;
 
 	for (i = 0; i < count; i++) {
-		hooks[i].lsm = lsm;
+		hooks[i].lsmid = lsmid;
 		hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
 	}
 
@@ -495,7 +495,7 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
 	 * and fix this up afterwards.
 	 */
 	if (slab_is_available()) {
-		if (lsm_append(lsm, &lsm_names) < 0)
+		if (lsm_append(lsmid->lsm, &lsm_names) < 0)
 			panic("%s - Cannot get early memory.\n", __func__);
 	}
 }
@@ -2070,7 +2070,7 @@ int security_getprocattr(struct task_struct *p, const char *lsm,
 	struct security_hook_list *hp;
 
 	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
-		if (lsm != NULL && strcmp(lsm, hp->lsm))
+		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
 			continue;
 		return hp->hook.getprocattr(p, name, value);
 	}
@@ -2083,7 +2083,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
 	struct security_hook_list *hp;
 
 	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
-		if (lsm != NULL && strcmp(lsm, hp->lsm))
+		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
 			continue;
 		return hp->hook.setprocattr(name, value, size);
 	}
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f553c370397e..aee20bb1778d 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7014,6 +7014,10 @@ static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
 }
 #endif /* CONFIG_IO_URING */
 
+static struct lsm_id selinux_lsmid __lsm_ro_after_init = {
+	.lsm = "selinux",
+};
+
 /*
  * IMPORTANT NOTE: When adding new hooks, please be careful to keep this order:
  * 1. any hooks that don't belong to (2.) or (3.) below,
@@ -7334,7 +7338,8 @@ static __init int selinux_init(void)
 
 	hashtab_cache_init();
 
-	security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), "selinux");
+	security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks),
+			   &selinux_lsmid);
 
 	if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
 		panic("SELinux: Unable to register AVC netcache callback\n");
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index b6306d71c908..0c0fea933bbd 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4787,6 +4787,10 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
 	.lbs_superblock = sizeof(struct superblock_smack),
 };
 
+static struct lsm_id smack_lsmid __lsm_ro_after_init = {
+	.lsm = "smack",
+};
+
 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
 	LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
@@ -4990,7 +4994,7 @@ static __init int smack_init(void)
 	/*
 	 * Register with LSM
 	 */
-	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
+	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), &smack_lsmid);
 	smack_enabled = 1;
 
 	pr_info("Smack:  Initializing.\n");
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 71e82d855ebf..80fbab5d2d7e 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -530,6 +530,10 @@ static void tomoyo_task_free(struct task_struct *task)
 	}
 }
 
+static struct lsm_id tomoyo_lsmid __lsm_ro_after_init = {
+	.lsm = "tomoyo",
+};
+
 /*
  * tomoyo_security_ops is a "struct security_operations" which is used for
  * registering TOMOYO.
@@ -582,7 +586,8 @@ static int __init tomoyo_init(void)
 	struct tomoyo_task *s = tomoyo_task(current);
 
 	/* register ourselves with the security framework */
-	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
+	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks),
+			   &tomoyo_lsmid);
 	pr_info("TOMOYO Linux initialized\n");
 	s->domain_info = &tomoyo_kernel_domain;
 	atomic_inc(&tomoyo_kernel_domain.users);
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 06e226166aab..4f60158850a7 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -421,6 +421,10 @@ static int yama_ptrace_traceme(struct task_struct *parent)
 	return rc;
 }
 
+static struct lsm_id yama_lsmid __lsm_ro_after_init = {
+	.lsm = "yama",
+};
+
 static struct security_hook_list yama_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(ptrace_access_check, yama_ptrace_access_check),
 	LSM_HOOK_INIT(ptrace_traceme, yama_ptrace_traceme),
@@ -477,7 +481,7 @@ static inline void yama_init_sysctl(void) { }
 static int __init yama_init(void)
 {
 	pr_info("Yama: becoming mindful.\n");
-	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama");
+	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), &yama_lsmid);
 	yama_init_sysctl();
 	return 0;
 }
-- 
2.37.3

[PATCH v1 2/8] LSM: Add an LSM identifier for external use

[Casey Schaufler]

Add an integer member "id" to the struct lsm_id. This value is
a unique identifier associated with each security module. The
values are defined in a new UAPI header file. Each existing LSM
has been updated to include it's LSMID in the lsm_id.

The LSM ID values are sequential, with the oldest module
LSM_ID_CAPABILITY being the lowest value and the existing
modules numbered in the order they were included in the
main line kernel. The first 32 values (0 - 31) are reserved
for some as yet unknown but important use.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h    |  1 +
 include/uapi/linux/lsm.h     | 32 ++++++++++++++++++++++++++++++++
 security/apparmor/lsm.c      |  2 ++
 security/bpf/hooks.c         |  2 ++
 security/commoncap.c         |  2 ++
 security/landlock/setup.c    |  2 ++
 security/loadpin/loadpin.c   |  2 ++
 security/lockdown/lockdown.c |  2 ++
 security/safesetid/lsm.c     |  2 ++
 security/selinux/hooks.c     |  2 ++
 security/smack/smack_lsm.c   |  2 ++
 security/tomoyo/tomoyo.c     |  2 ++
 security/yama/yama_lsm.c     |  2 ++
 13 files changed, 55 insertions(+)
 create mode 100644 include/uapi/linux/lsm.h

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index e383e468f742..dd4b4d95a172 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1607,6 +1607,7 @@ struct security_hook_heads {
  */
 struct lsm_id {
 	const char	*lsm;		/* Name of the LSM */
+	int		id;		/* LSM ID */
 };
 
 /*
diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
new file mode 100644
index 000000000000..d5bcbb9375df
--- /dev/null
+++ b/include/uapi/linux/lsm.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Linus Security Modules (LSM) - User space API
+ *
+ * Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
+ * Copyright (C) Intel Corporation
+ */
+
+#ifndef _UAPI_LINUX_LSM_H
+#define _UAPI_LINUX_LSM_H
+
+/*
+ * ID values to identify security modules.
+ * A system may use more than one security module.
+ *
+ * LSM_ID_XXX values 0 - 31 are reserved for future use
+ */
+#define LSM_ID_INVALID		-1
+#define LSM_ID_CAPABILITY	32
+#define LSM_ID_SELINUX		33
+#define LSM_ID_SMACK		34
+#define LSM_ID_TOMOYO		35
+#define LSM_ID_IMA		36
+#define LSM_ID_APPARMOR		37
+#define LSM_ID_YAMA		38
+#define LSM_ID_LOADPIN		39
+#define LSM_ID_SAFESETID	40
+#define LSM_ID_LOCKDOWN		41
+#define LSM_ID_BPF		42
+#define LSM_ID_LANDLOCK		43
+
+#endif /* _UAPI_LINUX_LSM_H */
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index e708c1ad7267..b859b1af6c75 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -24,6 +24,7 @@
 #include <linux/zlib.h>
 #include <net/sock.h>
 #include <uapi/linux/mount.h>
+#include <uapi/linux/lsm.h>
 
 #include "include/apparmor.h"
 #include "include/apparmorfs.h"
@@ -1204,6 +1205,7 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
 
 static struct lsm_id apparmor_lsmid __lsm_ro_after_init = {
 	.lsm = "apparmor",
+	.id = LSM_ID_APPARMOR,
 };
 
 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c
index ef9b1d983665..20983ae8d31f 100644
--- a/security/bpf/hooks.c
+++ b/security/bpf/hooks.c
@@ -5,6 +5,7 @@
  */
 #include <linux/lsm_hooks.h>
 #include <linux/bpf_lsm.h>
+#include <uapi/linux/lsm.h>
 
 static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
 	#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
@@ -21,6 +22,7 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
  */
 struct lsm_id bpf_lsmid __lsm_ro_after_init = {
 	.lsm = "bpf",
+	.id = LSM_ID_BPF,
 };
 
 static int __init bpf_lsm_init(void)
diff --git a/security/commoncap.c b/security/commoncap.c
index 986920da0c26..940e36d8503d 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -25,6 +25,7 @@
 #include <linux/binfmts.h>
 #include <linux/personality.h>
 #include <linux/mnt_idmapping.h>
+#include <uapi/linux/lsm.h>
 
 /*
  * If a non-root user executes a setuid-root binary in
@@ -1448,6 +1449,7 @@ int cap_mmap_file(struct file *file, unsigned long reqprot,
 
 static struct lsm_id capability_lsmid __lsm_ro_after_init = {
 	.lsm = "capability",
+	.id = LSM_ID_CAPABILITY,
 };
 
 static struct security_hook_list capability_hooks[] __lsm_ro_after_init = {
diff --git a/security/landlock/setup.c b/security/landlock/setup.c
index 4a12666a4090..5b32c087e34b 100644
--- a/security/landlock/setup.c
+++ b/security/landlock/setup.c
@@ -8,6 +8,7 @@
 
 #include <linux/init.h>
 #include <linux/lsm_hooks.h>
+#include <uapi/linux/lsm.h>
 
 #include "common.h"
 #include "cred.h"
@@ -25,6 +26,7 @@ struct lsm_blob_sizes landlock_blob_sizes __lsm_ro_after_init = {
 
 struct lsm_id landlock_lsmid __lsm_ro_after_init = {
 	.lsm = LANDLOCK_NAME,
+	.id = LSM_ID_LANDLOCK,
 };
 
 static int __init landlock_init(void)
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index 24d041a888b8..32bdf7294a6f 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -20,6 +20,7 @@
 #include <linux/string_helpers.h>
 #include <linux/dm-verity-loadpin.h>
 #include <uapi/linux/loadpin.h>
+#include <uapi/linux/lsm.h>
 
 #define VERITY_DIGEST_FILE_HEADER "# LOADPIN_TRUSTED_VERITY_ROOT_DIGESTS"
 
@@ -199,6 +200,7 @@ static int loadpin_load_data(enum kernel_load_data_id id, bool contents)
 
 static struct lsm_id loadpin_lsmid __lsm_ro_after_init = {
 	.lsm = "loadpin",
+	.id = LSM_ID_LOADPIN,
 };
 
 static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = {
diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 2004d67f7201..e8c41a0caf7d 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -13,6 +13,7 @@
 #include <linux/security.h>
 #include <linux/export.h>
 #include <linux/lsm_hooks.h>
+#include <uapi/linux/lsm.h>
 
 static enum lockdown_reason kernel_locked_down;
 
@@ -77,6 +78,7 @@ static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = {
 
 static struct lsm_id lockdown_lsmid __lsm_ro_after_init = {
 	.lsm = "lockdown",
+	.id = LSM_ID_LOCKDOWN,
 };
 
 static int __init lockdown_lsm_init(void)
diff --git a/security/safesetid/lsm.c b/security/safesetid/lsm.c
index d9af1d04d293..8d0742ba045d 100644
--- a/security/safesetid/lsm.c
+++ b/security/safesetid/lsm.c
@@ -19,6 +19,7 @@
 #include <linux/ptrace.h>
 #include <linux/sched/task_stack.h>
 #include <linux/security.h>
+#include <uapi/linux/lsm.h>
 #include "lsm.h"
 
 /* Flag indicating whether initialization completed */
@@ -263,6 +264,7 @@ static int safesetid_task_fix_setgroups(struct cred *new, const struct cred *old
 
 static struct lsm_id safesetid_lsmid __lsm_ro_after_init = {
 	.lsm = "safesetid",
+	.id = LSM_ID_SAFESETID,
 };
 
 static struct security_hook_list safesetid_security_hooks[] = {
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index aee20bb1778d..5fcce36267bd 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -92,6 +92,7 @@
 #include <linux/fsnotify.h>
 #include <linux/fanotify.h>
 #include <linux/io_uring.h>
+#include <uapi/linux/lsm.h>
 
 #include "avc.h"
 #include "objsec.h"
@@ -7016,6 +7017,7 @@ static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
 
 static struct lsm_id selinux_lsmid __lsm_ro_after_init = {
 	.lsm = "selinux",
+	.id = LSM_ID_SELINUX,
 };
 
 /*
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 0c0fea933bbd..c7ba80e20b8d 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -43,6 +43,7 @@
 #include <linux/fs_parser.h>
 #include <linux/watch_queue.h>
 #include <linux/io_uring.h>
+#include <uapi/linux/lsm.h>
 #include "smack.h"
 
 #define TRANS_TRUE	"TRUE"
@@ -4789,6 +4790,7 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
 
 static struct lsm_id smack_lsmid __lsm_ro_after_init = {
 	.lsm = "smack",
+	.id = LSM_ID_SMACK,
 };
 
 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 80fbab5d2d7e..1916eb6216f7 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/lsm_hooks.h>
+#include <uapi/linux/lsm.h>
 #include "common.h"
 
 /**
@@ -532,6 +533,7 @@ static void tomoyo_task_free(struct task_struct *task)
 
 static struct lsm_id tomoyo_lsmid __lsm_ro_after_init = {
 	.lsm = "tomoyo",
+	.id = LSM_ID_TOMOYO,
 };
 
 /*
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 4f60158850a7..2487b8f847f3 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -18,6 +18,7 @@
 #include <linux/task_work.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
+#include <uapi/linux/lsm.h>
 
 #define YAMA_SCOPE_DISABLED	0
 #define YAMA_SCOPE_RELATIONAL	1
@@ -423,6 +424,7 @@ static int yama_ptrace_traceme(struct task_struct *parent)
 
 static struct lsm_id yama_lsmid __lsm_ro_after_init = {
 	.lsm = "yama",
+	.id = LSM_ID_YAMA,
 };
 
 static struct security_hook_list yama_hooks[] __lsm_ro_after_init = {
-- 
2.37.3

[PATCH v1 3/8] LSM: Identify the process attributes for each module

[Casey Schaufler]

Add an integer member "features" to the struct lsm_id which
identifies the API related data associated with each security
module. The initial set of features maps to information that
has traditionaly been available in /proc/self/attr.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h  |  1 +
 include/uapi/linux/lsm.h   | 14 ++++++++++++++
 security/apparmor/lsm.c    |  1 +
 security/selinux/hooks.c   |  2 ++
 security/smack/smack_lsm.c |  1 +
 5 files changed, 19 insertions(+)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index dd4b4d95a172..46b2aa6a677e 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1608,6 +1608,7 @@ struct security_hook_heads {
 struct lsm_id {
 	const char	*lsm;		/* Name of the LSM */
 	int		id;		/* LSM ID */
+	int		features;	/* Set of LSM features */
 };
 
 /*
diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
index d5bcbb9375df..61e13b1b9ece 100644
--- a/include/uapi/linux/lsm.h
+++ b/include/uapi/linux/lsm.h
@@ -29,4 +29,18 @@
 #define LSM_ID_BPF		42
 #define LSM_ID_LANDLOCK		43
 
+/*
+ * LSM_ATTR_XXX values identify the /proc/.../attr entry that the
+ * context represents. Not all security modules provide all of these
+ * values. Some security modules provide none of them.
+ */
+/* clang-format off */
+#define LSM_ATTR_CURRENT	(1UL << 0)
+#define LSM_ATTR_EXEC		(1UL << 1)
+#define LSM_ATTR_FSCREATE	(1UL << 2)
+#define LSM_ATTR_KEYCREATE	(1UL << 3)
+#define LSM_ATTR_PREV		(1UL << 4)
+#define LSM_ATTR_SOCKCREATE	(1UL << 5)
+/* clang-format on */
+
 #endif /* _UAPI_LINUX_LSM_H */
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index b859b1af6c75..77260026fda0 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1206,6 +1206,7 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
 static struct lsm_id apparmor_lsmid __lsm_ro_after_init = {
 	.lsm = "apparmor",
 	.id = LSM_ID_APPARMOR,
+	.features = LSM_ATTR_CURRENT | LSM_ATTR_PREV | LSM_ATTR_EXEC,
 };
 
 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 5fcce36267bd..107b944e5d45 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7018,6 +7018,8 @@ static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
 static struct lsm_id selinux_lsmid __lsm_ro_after_init = {
 	.lsm = "selinux",
 	.id = LSM_ID_SELINUX,
+	.features = LSM_ATTR_CURRENT | LSM_ATTR_EXEC | LSM_ATTR_FSCREATE |
+		    LSM_ATTR_KEYCREATE | LSM_ATTR_PREV | LSM_ATTR_SOCKCREATE,
 };
 
 /*
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index c7ba80e20b8d..12ff27c00fe6 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4791,6 +4791,7 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
 static struct lsm_id smack_lsmid __lsm_ro_after_init = {
 	.lsm = "smack",
 	.id = LSM_ID_SMACK,
+	.features = LSM_ATTR_CURRENT,
 };
 
 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
-- 
2.37.3

[PATCH v1 4/8] LSM: Maintain a table of LSM attribute data

[Casey Schaufler]

As LSMs are registered add their lsm_id pointers to a table.
This will be used later for attribute reporting.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/security.h | 17 +++++++++++++++++
 security/security.c      | 18 ++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/linux/security.h b/include/linux/security.h
index ca1b7109c0db..e1678594d983 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -138,6 +138,23 @@ enum lockdown_reason {
 
 extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1];
 
+#define LSMID_ENTRIES ( \
+	1 + /* capabilities */ \
+	(IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_IMA) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_LOCKDOWN) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
+	(IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0))
+
+extern int lsm_id;
+extern struct lsm_id *lsm_idlist[];
+
 /* These functions are in security/commoncap.c */
 extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
 		       int cap, unsigned int opts);
diff --git a/security/security.c b/security/security.c
index b2eb0ccd954b..bf206996a2af 100644
--- a/security/security.c
+++ b/security/security.c
@@ -28,6 +28,7 @@
 #include <linux/backing-dev.h>
 #include <linux/string.h>
 #include <linux/msg.h>
+#include <uapi/linux/lsm.h>
 #include <net/flow.h>
 
 #define MAX_LSM_EVM_XATTR	2
@@ -320,6 +321,12 @@ static void __init lsm_early_task(struct task_struct *task);
 
 static int lsm_append(const char *new, char **result);
 
+/*
+ * Current index to use while initializing the lsm id list.
+ */
+int lsm_id __lsm_ro_after_init;
+struct lsm_id *lsm_idlist[LSMID_ENTRIES] __lsm_ro_after_init;
+
 static void __init ordered_lsm_init(void)
 {
 	struct lsm_info **lsm;
@@ -364,6 +371,7 @@ static void __init ordered_lsm_init(void)
 	for (lsm = ordered_lsms; *lsm; lsm++)
 		initialize_lsm(*lsm);
 
+	init_debug("lsm count            = %d\n", lsm_id);
 	kfree(ordered_lsms);
 }
 
@@ -485,6 +493,16 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
 {
 	int i;
 
+	/*
+	 * A security module may call security_add_hooks() more
+	 * than once. Landlock is one such case.
+	 */
+	if (lsm_id == 0 || lsm_idlist[lsm_id - 1] != lsmid)
+		lsm_idlist[lsm_id++] = lsmid;
+
+	if (lsm_id > LSMID_ENTRIES)
+		panic("%s Too many LSMs registered.\n", __func__);
+
 	for (i = 0; i < count; i++) {
 		hooks[i].lsmid = lsmid;
 		hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
-- 
2.37.3

[PATCH v1 5/8] proc: Use lsmids instead of lsm names for attrs

[Casey Schaufler]

Use the LSM ID number instead of the LSM name to identify which
security module's attibute data should be shown in /proc/self/attr.
The security_[gs]etprocattr() functions have been changed to expect
the LSM ID. The change from a string comparison to an integer comparison
in these functions will provide a minor performance improvement.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 fs/proc/base.c           | 29 +++++++++++++++--------------
 fs/proc/internal.h       |  2 +-
 include/linux/security.h | 11 +++++------
 security/security.c      | 11 +++++------
 4 files changed, 26 insertions(+), 27 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9e479d7d202b..e3dfcb9d68f2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -96,6 +96,7 @@
 #include <linux/time_namespace.h>
 #include <linux/resctrl.h>
 #include <linux/cn_proc.h>
+#include <uapi/linux/lsm.h>
 #include <trace/events/oom.h>
 #include "internal.h"
 #include "fd.h"
@@ -145,10 +146,10 @@ struct pid_entry {
 	NOD(NAME, (S_IFREG|(MODE)),			\
 		NULL, &proc_single_file_operations,	\
 		{ .proc_show = show } )
-#define ATTR(LSM, NAME, MODE)				\
+#define ATTR(LSMID, NAME, MODE)				\
 	NOD(NAME, (S_IFREG|(MODE)),			\
 		NULL, &proc_pid_attr_operations,	\
-		{ .lsm = LSM })
+		{ .lsmid = LSMID })
 
 /*
  * Count the number of hardlinks for the pid_entry table, excluding the .
@@ -2730,7 +2731,7 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
 	if (!task)
 		return -ESRCH;
 
-	length = security_getprocattr(task, PROC_I(inode)->op.lsm,
+	length = security_getprocattr(task, PROC_I(inode)->op.lsmid,
 				      file->f_path.dentry->d_name.name,
 				      &p);
 	put_task_struct(task);
@@ -2788,7 +2789,7 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
 	if (rv < 0)
 		goto out_free;
 
-	rv = security_setprocattr(PROC_I(inode)->op.lsm,
+	rv = security_setprocattr(PROC_I(inode)->op.lsmid,
 				  file->f_path.dentry->d_name.name, page,
 				  count);
 	mutex_unlock(&current->signal->cred_guard_mutex);
@@ -2837,27 +2838,27 @@ static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
 
 #ifdef CONFIG_SECURITY_SMACK
 static const struct pid_entry smack_attr_dir_stuff[] = {
-	ATTR("smack", "current",	0666),
+	ATTR(LSM_ID_SMACK, "current",	0666),
 };
 LSM_DIR_OPS(smack);
 #endif
 
 #ifdef CONFIG_SECURITY_APPARMOR
 static const struct pid_entry apparmor_attr_dir_stuff[] = {
-	ATTR("apparmor", "current",	0666),
-	ATTR("apparmor", "prev",	0444),
-	ATTR("apparmor", "exec",	0666),
+	ATTR(LSM_ID_APPARMOR, "current",	0666),
+	ATTR(LSM_ID_APPARMOR, "prev",		0444),
+	ATTR(LSM_ID_APPARMOR, "exec",		0666),
 };
 LSM_DIR_OPS(apparmor);
 #endif
 
 static const struct pid_entry attr_dir_stuff[] = {
-	ATTR(NULL, "current",		0666),
-	ATTR(NULL, "prev",		0444),
-	ATTR(NULL, "exec",		0666),
-	ATTR(NULL, "fscreate",		0666),
-	ATTR(NULL, "keycreate",		0666),
-	ATTR(NULL, "sockcreate",	0666),
+	ATTR(LSM_ID_INVALID, "current",		0666),
+	ATTR(LSM_ID_INVALID, "prev",		0444),
+	ATTR(LSM_ID_INVALID, "exec",		0666),
+	ATTR(LSM_ID_INVALID, "fscreate",	0666),
+	ATTR(LSM_ID_INVALID, "keycreate",	0666),
+	ATTR(LSM_ID_INVALID, "sockcreate",	0666),
 #ifdef CONFIG_SECURITY_SMACK
 	DIR("smack",			0555,
 	    proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index b701d0207edf..18db9722c81b 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -92,7 +92,7 @@ union proc_op {
 	int (*proc_show)(struct seq_file *m,
 		struct pid_namespace *ns, struct pid *pid,
 		struct task_struct *task);
-	const char *lsm;
+	int lsmid;
 };
 
 struct proc_inode {
diff --git a/include/linux/security.h b/include/linux/security.h
index e1678594d983..8e0bf4a88553 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -481,10 +481,9 @@ int security_sem_semctl(struct kern_ipc_perm *sma, int cmd);
 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
 			unsigned nsops, int alter);
 void security_d_instantiate(struct dentry *dentry, struct inode *inode);
-int security_getprocattr(struct task_struct *p, const char *lsm, const char *name,
+int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
 			 char **value);
-int security_setprocattr(const char *lsm, const char *name, void *value,
-			 size_t size);
+int security_setprocattr(int lsmid, const char *name, void *value, size_t size);
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_ismaclabel(const char *name);
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
@@ -1325,14 +1324,14 @@ static inline void security_d_instantiate(struct dentry *dentry,
 					  struct inode *inode)
 { }
 
-static inline int security_getprocattr(struct task_struct *p, const char *lsm,
+static inline int security_getprocattr(struct task_struct *p, int lsmid,
 				       const char *name, char **value)
 {
 	return -EINVAL;
 }
 
-static inline int security_setprocattr(const char *lsm, char *name,
-				       void *value, size_t size)
+static inline int security_setprocattr(int lsmid, char *name, void *value,
+				       size_t size)
 {
 	return -EINVAL;
 }
diff --git a/security/security.c b/security/security.c
index bf206996a2af..29d4fc6f789d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2082,26 +2082,25 @@ void security_d_instantiate(struct dentry *dentry, struct inode *inode)
 }
 EXPORT_SYMBOL(security_d_instantiate);
 
-int security_getprocattr(struct task_struct *p, const char *lsm,
-			 const char *name, char **value)
+int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
+			 char **value)
 {
 	struct security_hook_list *hp;
 
 	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
-		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
+		if (lsmid != LSM_ID_INVALID && lsmid != hp->lsmid->id)
 			continue;
 		return hp->hook.getprocattr(p, name, value);
 	}
 	return LSM_RET_DEFAULT(getprocattr);
 }
 
-int security_setprocattr(const char *lsm, const char *name, void *value,
-			 size_t size)
+int security_setprocattr(int lsmid, const char *name, void *value, size_t size)
 {
 	struct security_hook_list *hp;
 
 	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
-		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
+		if (lsmid != LSM_ID_INVALID && lsmid != hp->lsmid->id)
 			continue;
 		return hp->hook.setprocattr(name, value, size);
 	}
-- 
2.37.3

[PATCH v1 6/8] LSM: lsm_self_attr syscall for LSM self attributes

[Casey Schaufler]

Create a system call lsm_self_attr() to provide the security
module maintained attributes of the current process. Historically
these attributes have been exposed to user space via entries in
procfs under /proc/self/attr.

Attributes are provided as a collection of lsm_ctx structures
which are placed into a user supplied buffer. Each structure
identifys the security module providing the attribute, which
of the possible attributes is provided, the size of the
attribute, and finally the attribute value. The format of the
attribute value is defined by the security module, but will
always be \0 terminated. The ctx_len value will be larger than
strlen(ctx).

        ------------------------------
        | unsigned int id            |
        ------------------------------
        | unsigned int flags         |
        ------------------------------
        | __kernel_size_t ctx_len    |
        ------------------------------
        | unsigned char ctx[ctx_len] |
        ------------------------------
        | unsigned int id            |
        ------------------------------
        | unsigned int flags         |
        ------------------------------
        | __kernel_size_t ctx_len    |
        ------------------------------
        | unsigned char ctx[ctx_len] |
        ------------------------------

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/syscalls.h |   2 +
 include/uapi/linux/lsm.h |  21 ++++++
 kernel/sys_ni.c          |   3 +
 security/Makefile        |   1 +
 security/lsm_syscalls.c  | 156 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 183 insertions(+)
 create mode 100644 security/lsm_syscalls.c

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index a34b0f9a9972..2d9033e9e5a0 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -71,6 +71,7 @@ struct clone_args;
 struct open_how;
 struct mount_attr;
 struct landlock_ruleset_attr;
+struct lsm_cxt;
 enum landlock_rule_type;
 
 #include <linux/types.h>
@@ -1056,6 +1057,7 @@ asmlinkage long sys_memfd_secret(unsigned int flags);
 asmlinkage long sys_set_mempolicy_home_node(unsigned long start, unsigned long len,
 					    unsigned long home_node,
 					    unsigned long flags);
+asmlinkage long sys_lsm_self_attr(struct lsm_ctx *ctx, size_t *size, int flags);
 
 /*
  * Architecture-specific system calls
diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
index 61e13b1b9ece..1d27fb5b7746 100644
--- a/include/uapi/linux/lsm.h
+++ b/include/uapi/linux/lsm.h
@@ -9,6 +9,27 @@
 #ifndef _UAPI_LINUX_LSM_H
 #define _UAPI_LINUX_LSM_H
 
+#include <linux/types.h>
+#include <linux/unistd.h>
+
+/**
+ * struct lsm_ctx - LSM context
+ * @id: the LSM id number, see LSM_ID_XXX
+ * @flags: context specifier and LSM specific flags
+ * @ctx_len: the size of @ctx
+ * @ctx: the LSM context, a nul terminated string
+ *
+ * @ctx in a nul terminated string.
+ *	(strlen(@ctx) < @ctx_len) is always true.
+ *	(strlen(@ctx) == @ctx_len + 1) is not guaranteed.
+ */
+struct lsm_ctx {
+	unsigned int		id;
+	unsigned int		flags;
+	__kernel_size_t		ctx_len;
+	unsigned char		ctx[];
+};
+
 /*
  * ID values to identify security modules.
  * A system may use more than one security module.
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 860b2dcf3ac4..0fdb0341251d 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -262,6 +262,9 @@ COND_SYSCALL_COMPAT(recvmsg);
 /* mm/nommu.c, also with MMU */
 COND_SYSCALL(mremap);
 
+/* security/lsm_syscalls.c */
+COND_SYSCALL(lsm_self_attr);
+
 /* security/keys/keyctl.c */
 COND_SYSCALL(add_key);
 COND_SYSCALL(request_key);
diff --git a/security/Makefile b/security/Makefile
index 18121f8f85cd..59f238490665 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_KEYS)			+= keys/
 
 # always enable default capabilities
 obj-y					+= commoncap.o
+obj-$(CONFIG_SECURITY) 			+= lsm_syscalls.o
 obj-$(CONFIG_MMU)			+= min_addr.o
 
 # Object file lists
diff --git a/security/lsm_syscalls.c b/security/lsm_syscalls.c
new file mode 100644
index 000000000000..da0fab7065e2
--- /dev/null
+++ b/security/lsm_syscalls.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * System calls implementing the Linux Security Module API.
+ *
+ *  Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
+ *  Copyright (C) Intel Corporation
+ */
+
+#include <asm/current.h>
+#include <linux/compiler_types.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/security.h>
+#include <linux/stddef.h>
+#include <linux/syscalls.h>
+#include <linux/types.h>
+#include <linux/lsm_hooks.h>
+#include <uapi/linux/lsm.h>
+
+struct feature_map {
+	char *name;
+	int feature;
+};
+
+static const struct feature_map lsm_attr_names[] = {
+	{ .name = "current",	.feature = LSM_ATTR_CURRENT, },
+	{ .name = "exec",	.feature = LSM_ATTR_EXEC, },
+	{ .name = "fscreate",	.feature = LSM_ATTR_FSCREATE, },
+	{ .name = "keycreate",	.feature = LSM_ATTR_KEYCREATE, },
+	{ .name = "prev",	.feature = LSM_ATTR_PREV, },
+	{ .name = "sockcreate",	.feature = LSM_ATTR_SOCKCREATE, },
+};
+
+/**
+ * lsm_self_attr - Return current task's security module attributes
+ * @ctx: the LSM contexts
+ * @size: size of @ctx, updated on return
+ * @flags: reserved for future use, must be zero
+ *
+ * Returns the calling task's LSM contexts. On success this
+ * function returns the number of @ctx array elements. This value
+ * may be zero if there are no LSM contexts assigned. If @size is
+ * insufficient to contain the return data -E2BIG is returned and
+ * @size is set to the minimum required size. In all other cases
+ * a negative value indicating the error is returned.
+ */
+SYSCALL_DEFINE3(lsm_self_attr,
+	       struct lsm_ctx __user *, ctx,
+	       size_t __user *, size,
+	       int, flags)
+{
+	struct lsm_ctx *final = NULL;
+	struct lsm_ctx *interum;
+	struct lsm_ctx *ip;
+	void *curr;
+	char **interum_ctx;
+	char *cp;
+	size_t total_size = 0;
+	int count = 0;
+	int attr;
+	int len;
+	int rc = 0;
+	int i;
+
+	interum = kzalloc(ARRAY_SIZE(lsm_attr_names) * lsm_id *
+			  sizeof(*interum), GFP_KERNEL);
+	if (interum == NULL)
+		return -ENOMEM;
+	ip = interum;
+
+	interum_ctx = kzalloc(ARRAY_SIZE(lsm_attr_names) * lsm_id *
+			      sizeof(*interum_ctx), GFP_KERNEL);
+	if (interum_ctx == NULL) {
+		kfree(interum);
+		return -ENOMEM;
+	}
+
+	for (attr = 0; attr < ARRAY_SIZE(lsm_attr_names); attr++) {
+		for (i = 0; i < lsm_id; i++) {
+			if ((lsm_idlist[i]->features &
+			     lsm_attr_names[attr].feature) == 0)
+				continue;
+
+			len = security_getprocattr(current, lsm_idlist[i]->id,
+						   lsm_attr_names[attr].name,
+						   &cp);
+			if (len <= 0)
+				continue;
+
+			ip->id = lsm_idlist[i]->id;
+			ip->flags = lsm_attr_names[attr].feature;
+			/* space for terminating \0 is allocated below */
+			ip->ctx_len = len + 1;
+			interum_ctx[count] = cp;
+			/*
+			 * Security modules have been inconsistent about
+			 * including the \0 terminator in the size. The
+			 * context len has been adjusted to ensure there
+			 * is one.
+			 * At least one security module adds a \n at the
+			 * end of a context to make it look nicer. Change
+			 * that to a \0 so that user space doesn't have to
+			 * work around it. Because of this meddling it is
+			 * safe to assume that lsm_ctx.name is terminated
+			 * and that strlen(lsm_ctx.name) < lsm.ctx_len.
+			 */
+			total_size += sizeof(*interum) + ip->ctx_len;
+			cp = strnchr(cp, len, '\n');
+			if (cp != NULL)
+				*cp = '\0';
+			ip++;
+			count++;
+		}
+	}
+
+	if (count == 0)
+		goto free_out;
+
+	final = kzalloc(total_size, GFP_KERNEL);
+	if (final == NULL) {
+		rc = -ENOMEM;
+		goto free_out;
+	}
+
+	curr = final;
+	ip = interum;
+	for (i = 0; i < count; i++) {
+		memcpy(curr, ip, sizeof(*interum));
+		curr += sizeof(*interum);
+		memcpy(curr, interum_ctx[i], ip->ctx_len);
+		curr += ip->ctx_len;
+		ip++;
+	}
+
+	if (get_user(len, size)) {
+		rc = -EFAULT;
+		goto free_out;
+	}
+	if (total_size > len) {
+		rc = -ERANGE;
+		goto free_out;
+	}
+	if (copy_to_user(ctx, final, total_size) != 0 ||
+	    put_user(total_size, size) != 0)
+		rc = -EFAULT;
+	else
+		rc = count;
+
+free_out:
+	for (i = 0; i < count; i++)
+		kfree(interum_ctx[i]);
+	kfree(interum_ctx);
+	kfree(interum);
+	kfree(final);
+	return rc;
+}
-- 
2.37.3

[PATCH v1 7/8] LSM: Create lsm_module_list system call

[Casey Schaufler]

Create a system call to report the list of Linux Security Modules
that are active on the system. The list is provided as an array
of LSM ID numbers.

The calling application can use this list determine what LSM
specific actions it might take. That might include chosing an
output format, determining required privilege or bypassing
security module specific behavior.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/syscalls.h |  1 +
 kernel/sys_ni.c          |  1 +
 security/lsm_syscalls.c  | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 2d9033e9e5a0..02bb82142e24 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1058,6 +1058,7 @@ asmlinkage long sys_set_mempolicy_home_node(unsigned long start, unsigned long l
 					    unsigned long home_node,
 					    unsigned long flags);
 asmlinkage long sys_lsm_self_attr(struct lsm_ctx *ctx, size_t *size, int flags);
+asmlinkage long sys_lsm_module_list(unsigned int *ids, size_t *size, int flags);
 
 /*
  * Architecture-specific system calls
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 0fdb0341251d..bde9e74a3473 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -264,6 +264,7 @@ COND_SYSCALL(mremap);
 
 /* security/lsm_syscalls.c */
 COND_SYSCALL(lsm_self_attr);
+COND_SYSCALL(lsm_module_list);
 
 /* security/keys/keyctl.c */
 COND_SYSCALL(add_key);
diff --git a/security/lsm_syscalls.c b/security/lsm_syscalls.c
index da0fab7065e2..cd5db370b974 100644
--- a/security/lsm_syscalls.c
+++ b/security/lsm_syscalls.c
@@ -154,3 +154,41 @@ SYSCALL_DEFINE3(lsm_self_attr,
 	kfree(final);
 	return rc;
 }
+
+/**
+ * lsm_module_list - Return a list of the active security modules
+ * @ids: the LSM module ids
+ * @size: size of @ids, updated on return
+ * @flags: reserved for future use, must be zero
+ *
+ * Returns a list of the active LSM ids. On success this function
+ * returns the number of @ids array elements. This value may be zero
+ * if there are no LSMs active. If @size is insufficient to contain
+ * the return data -E2BIG is returned and @size is set to the minimum
+ * required size. In all other cases a negative value indicating the
+ * error is returned.
+ */
+SYSCALL_DEFINE3(lsm_module_list,
+		unsigned int __user *, ids,
+		size_t __user *, size,
+		unsigned int, flags)
+{
+	size_t total_size = lsm_id * sizeof(*ids);
+	size_t usize;
+	int i;
+
+	if (get_user(usize, size))
+		return -EFAULT;
+
+	if (put_user(total_size, size) != 0)
+		return -EFAULT;
+
+	if (usize < total_size)
+		return -E2BIG;
+
+	for (i = 0; i < lsm_id; i++)
+		if (put_user(lsm_idlist[i]->id, ids++))
+			return -EFAULT;
+
+	return lsm_id;
+}
-- 
2.37.3

[PATCH v1 8/8] lsm: wireup syscalls lsm_self_attr and lsm_module_list

[Casey Schaufler]

Wireup two syscalls for Linux Security Modules.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 arch/alpha/kernel/syscalls/syscall.tbl              | 2 ++
 arch/arm/tools/syscall.tbl                          | 2 ++
 arch/arm64/include/asm/unistd32.h                   | 2 ++
 arch/ia64/kernel/syscalls/syscall.tbl               | 2 ++
 arch/m68k/kernel/syscalls/syscall.tbl               | 2 ++
 arch/microblaze/kernel/syscalls/syscall.tbl         | 2 ++
 arch/mips/kernel/syscalls/syscall_n32.tbl           | 2 ++
 arch/mips/kernel/syscalls/syscall_n64.tbl           | 2 ++
 arch/mips/kernel/syscalls/syscall_o32.tbl           | 2 ++
 arch/parisc/kernel/syscalls/syscall.tbl             | 2 ++
 arch/powerpc/kernel/syscalls/syscall.tbl            | 2 ++
 arch/s390/kernel/syscalls/syscall.tbl               | 2 ++
 arch/sh/kernel/syscalls/syscall.tbl                 | 2 ++
 arch/sparc/kernel/syscalls/syscall.tbl              | 2 ++
 arch/x86/entry/syscalls/syscall_32.tbl              | 2 ++
 arch/x86/entry/syscalls/syscall_64.tbl              | 2 ++
 arch/xtensa/kernel/syscalls/syscall.tbl             | 2 ++
 include/uapi/asm-generic/unistd.h                   | 5 ++++-
 tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl | 2 ++
 tools/perf/arch/powerpc/entry/syscalls/syscall.tbl  | 2 ++
 tools/perf/arch/s390/entry/syscalls/syscall.tbl     | 2 ++
 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl   | 2 ++
 22 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index 8ebacf37a8cf..41e4f3704ccf 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -490,3 +490,5 @@
 558	common	process_mrelease		sys_process_mrelease
 559	common  futex_waitv                     sys_futex_waitv
 560	common	set_mempolicy_home_node		sys_ni_syscall
+561	common	lsm_self_attr			sys_lsm_self_attr
+562	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index ac964612d8b0..20d551be0b67 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -464,3 +464,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common	futex_waitv			sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 604a2053d006..366451dc8307 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -907,6 +907,8 @@ __SYSCALL(__NR_process_mrelease, sys_process_mrelease)
 __SYSCALL(__NR_futex_waitv, sys_futex_waitv)
 #define __NR_set_mempolicy_home_node 450
 __SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
+#define __NR_lsm_attr_set 451
+__SYSCALL(__NR_lsm_attr_set, sys_lsm_attr_set)
 
 /*
  * Please add new compat syscalls above this comment and update
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
index 72c929d9902b..a2ccef8e1eb1 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -371,3 +371,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index b1f3940bc298..59b977b3fa04 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -450,3 +450,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index 820145e47350..82c39a22e38b 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -456,3 +456,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 253ff994ed2e..f973b69e7dbe 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -389,3 +389,5 @@
 448	n32	process_mrelease		sys_process_mrelease
 449	n32	futex_waitv			sys_futex_waitv
 450	n32	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	n32	lsm_self_attr			sys_lsm_self_attr
+452	n32	lsm_module_list			sys_lsm_module_list
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 3f1886ad9d80..567035293634 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -365,3 +365,5 @@
 448	n64	process_mrelease		sys_process_mrelease
 449	n64	futex_waitv			sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	n64	lsm_self_attr			sys_lsm_self_attr
+452	n64	lsm_module_list			sys_lsm_module_list
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 8f243e35a7b2..22019aa08696 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -438,3 +438,5 @@
 448	o32	process_mrelease		sys_process_mrelease
 449	o32	futex_waitv			sys_futex_waitv
 450	o32	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	o32	lsm_self_attr			sys_lsm_self_attr
+452	o32	lsm_module_list			sys_lsm_module_list
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 8a99c998da9b..e52c292923f6 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -448,3 +448,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common	futex_waitv			sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index e9e0df4f9a61..099489ee5c45 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -534,3 +534,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450 	nospu	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 799147658dee..eaba1ed5654e 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -453,3 +453,5 @@
 448  common	process_mrelease	sys_process_mrelease		sys_process_mrelease
 449  common	futex_waitv		sys_futex_waitv			sys_futex_waitv
 450  common	set_mempolicy_home_node	sys_set_mempolicy_home_node	sys_set_mempolicy_home_node
+451  common	lsm_self_attr		sys_lsm_self_attr	sys_lsm_self_attr
+452  common	lsm_module_list		sys_lsm_module_list	sys_lsm_module_list
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index 2de85c977f54..b84c60d96f78 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -453,3 +453,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 4398cc6fb68d..f0831bf811e3 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -496,3 +496,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 320480a8db4f..259509a0e23d 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -455,3 +455,5 @@
 448	i386	process_mrelease	sys_process_mrelease
 449	i386	futex_waitv		sys_futex_waitv
 450	i386	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	i386	lsm_self_attr		sys_lsm_self_attr
+452	i386	lsm_module_list		sys_lsm_module_list
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index c84d12608cd2..40b35e7069a7 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -372,6 +372,8 @@
 448	common	process_mrelease	sys_process_mrelease
 449	common	futex_waitv		sys_futex_waitv
 450	common	set_mempolicy_home_node	sys_set_mempolicy_home_node
+451	common	lsm_self_attr		sys_lsm_self_attr
+452	common	lsm_module_list		sys_lsm_module_list
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 52c94ab5c205..f0c76d05b768 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -421,3 +421,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 45fa180cc56a..aa66718e1b48 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -886,8 +886,11 @@ __SYSCALL(__NR_futex_waitv, sys_futex_waitv)
 #define __NR_set_mempolicy_home_node 450
 __SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
 
+#define __NR_lsm_self_attr 451
+__SYSCALL(__NR_lsm_self_attr, sys_lsm_self_attr)
+
 #undef __NR_syscalls
-#define __NR_syscalls 451
+#define __NR_syscalls 452
 
 /*
  * 32 bit systems traditionally used different
diff --git a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
index 3f1886ad9d80..567035293634 100644
--- a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
+++ b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
@@ -365,3 +365,5 @@
 448	n64	process_mrelease		sys_process_mrelease
 449	n64	futex_waitv			sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	n64	lsm_self_attr			sys_lsm_self_attr
+452	n64	lsm_module_list			sys_lsm_module_list
diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
index 2bca64f96164..7b779080acbe 100644
--- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
@@ -530,3 +530,5 @@
 448	common	process_mrelease		sys_process_mrelease
 449	common  futex_waitv                     sys_futex_waitv
 450 	nospu	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	common	lsm_self_attr			sys_lsm_self_attr
+452	common	lsm_module_list			sys_lsm_module_list
diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
index 799147658dee..eaba1ed5654e 100644
--- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
@@ -453,3 +453,5 @@
 448  common	process_mrelease	sys_process_mrelease		sys_process_mrelease
 449  common	futex_waitv		sys_futex_waitv			sys_futex_waitv
 450  common	set_mempolicy_home_node	sys_set_mempolicy_home_node	sys_set_mempolicy_home_node
+451  common	lsm_self_attr		sys_lsm_self_attr	sys_lsm_self_attr
+452  common	lsm_module_list		sys_lsm_module_list	sys_lsm_module_list
diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
index c84d12608cd2..40b35e7069a7 100644
--- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
@@ -372,6 +372,8 @@
 448	common	process_mrelease	sys_process_mrelease
 449	common	futex_waitv		sys_futex_waitv
 450	common	set_mempolicy_home_node	sys_set_mempolicy_home_node
+451	common	lsm_self_attr		sys_lsm_self_attr
+452	common	lsm_module_list		sys_lsm_module_list
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
-- 
2.37.3

Re: [PATCH v1 0/8] LSM: Two basic syscalls

[Casey Schaufler]

On 11/23/2022 11:57 AM, Casey Schaufler wrote:
> Add two system calls for the Linux Security Module ABI.

Whoops. Sorry for the spam. Test posting escape. Please ignore.

[PATCH v1 0/8] LSM: Two basic syscalls

[Casey Schaufler]

Add two system calls for the Linux Security Module ABI.

lsm_self_attr() provides the security module specific attributes
that have previously been visible in the /proc/self/attr directory.
For each attribute that is set on the current process the system
call will return an LSM identifier, an attribute identifier and
the value of the attribute. The LSM and attribute identifier values
are defined in include/uapi/linux/lsm.h

lsm_module_list() provides the LSM identifiers, in order, of the
security modules that are active on the system. This has been
available in the securityfs file /sys/kernel/security/lsm.

Patch 0001 changes the LSM registration from passing the name
of the module to passing a lsm_id structure that contains the
name of the module.
Patch 0002 adds an LSM identifier number to the lsm_id structure.
Patch 0003 adds an attribute identifier to the lsm_id.
Patch 0004 adds the registered lsm_ids to a table.
Patch 0005 changes security_[gs]etprocattr() to use LSM IDs instead
of LSM names.
Patch 0006 implements lsm_self_attr().
Patch 0007 implements lsm_module_list().
Patch 0008 wires up the two syscalls.

Casey Schaufler (8):
  LSM: Identify modules by more than name
  LSM: Add an LSM identifier for external use
  LSM: Identify the process attributes for each module
  LSM: Maintain a table of LSM attribute data
  proc: Use lsmids instead of lsm names for attrs
  LSM: lsm_self_attr syscall for LSM self attributes
  LSM: Create lsm_module_list system call
  lsm: wireup syscalls lsm_self_attr and lsm_module_list

 arch/alpha/kernel/syscalls/syscall.tbl        |   2 +
 arch/arm/tools/syscall.tbl                    |   2 +
 arch/arm64/include/asm/unistd32.h             |   2 +
 arch/ia64/kernel/syscalls/syscall.tbl         |   2 +
 arch/m68k/kernel/syscalls/syscall.tbl         |   2 +
 arch/microblaze/kernel/syscalls/syscall.tbl   |   2 +
 arch/mips/kernel/syscalls/syscall_n32.tbl     |   2 +
 arch/mips/kernel/syscalls/syscall_n64.tbl     |   2 +
 arch/mips/kernel/syscalls/syscall_o32.tbl     |   2 +
 arch/parisc/kernel/syscalls/syscall.tbl       |   2 +
 arch/powerpc/kernel/syscalls/syscall.tbl      |   2 +
 arch/s390/kernel/syscalls/syscall.tbl         |   2 +
 arch/sh/kernel/syscalls/syscall.tbl           |   2 +
 arch/sparc/kernel/syscalls/syscall.tbl        |   2 +
 arch/x86/entry/syscalls/syscall_32.tbl        |   2 +
 arch/x86/entry/syscalls/syscall_64.tbl        |   2 +
 arch/xtensa/kernel/syscalls/syscall.tbl       |   2 +
 fs/proc/base.c                                |  29 +--
 fs/proc/internal.h                            |   2 +-
 include/linux/lsm_hooks.h                     |  13 +-
 include/linux/security.h                      |  28 ++-
 include/linux/syscalls.h                      |   3 +
 include/uapi/asm-generic/unistd.h             |   5 +-
 include/uapi/linux/lsm.h                      |  67 ++++++
 kernel/sys_ni.c                               |   4 +
 security/Makefile                             |   1 +
 security/apparmor/lsm.c                       |   9 +-
 security/bpf/hooks.c                          |  13 +-
 security/commoncap.c                          |   8 +-
 security/landlock/cred.c                      |   2 +-
 security/landlock/fs.c                        |   2 +-
 security/landlock/ptrace.c                    |   2 +-
 security/landlock/setup.c                     |   6 +
 security/landlock/setup.h                     |   1 +
 security/loadpin/loadpin.c                    |   9 +-
 security/lockdown/lockdown.c                  |   8 +-
 security/lsm_syscalls.c                       | 194 ++++++++++++++++++
 security/safesetid/lsm.c                      |   9 +-
 security/security.c                           |  37 +++-
 security/selinux/hooks.c                      |  11 +-
 security/smack/smack_lsm.c                    |   9 +-
 security/tomoyo/tomoyo.c                      |   9 +-
 security/yama/yama_lsm.c                      |   8 +-
 .../arch/mips/entry/syscalls/syscall_n64.tbl  |   2 +
 .../arch/powerpc/entry/syscalls/syscall.tbl   |   2 +
 .../perf/arch/s390/entry/syscalls/syscall.tbl |   2 +
 .../arch/x86/entry/syscalls/syscall_64.tbl    |   2 +
 47 files changed, 484 insertions(+), 47 deletions(-)
 create mode 100644 include/uapi/linux/lsm.h
 create mode 100644 security/lsm_syscalls.c


base-commit: 247f34f7b80357943234f93f247a1ae6b6c3a740
-- 
2.37.3