Re: [PATCH v15 11/11] LSM: selftests for Linux Security Module syscalls

From: Mickaël Salaün
Date: Tue Oct 03 2023 - 10:28:54 EST

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On Tue, Sep 12, 2023 at 01:56:56PM -0700, Casey Schaufler wrote:
> Add selftests for the three system calls supporting the LSM
> infrastructure. This set of tests is limited by the differences
> in access policy enforced by the existing security modules.
>
> Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>

I'd like more corner case tests, but these are good. Thanks for writing
them!

Reviewed-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Tested-by: Mickaël Salaün <mic@xxxxxxxxxxx>

> ---
> MAINTAINERS | 1 +
> tools/testing/selftests/Makefile | 1 +
> tools/testing/selftests/lsm/.gitignore | 1 +
> tools/testing/selftests/lsm/Makefile | 17 ++
> tools/testing/selftests/lsm/common.c | 89 ++++++
> tools/testing/selftests/lsm/common.h | 33 +++
> tools/testing/selftests/lsm/config | 3 +
> .../selftests/lsm/lsm_get_self_attr_test.c | 275 ++++++++++++++++++
> .../selftests/lsm/lsm_list_modules_test.c | 140 +++++++++
> .../selftests/lsm/lsm_set_self_attr_test.c | 74 +++++
> 10 files changed, 634 insertions(+)
> create mode 100644 tools/testing/selftests/lsm/.gitignore
> create mode 100644 tools/testing/selftests/lsm/Makefile
> create mode 100644 tools/testing/selftests/lsm/common.c
> create mode 100644 tools/testing/selftests/lsm/common.h
> create mode 100644 tools/testing/selftests/lsm/config
> create mode 100644 tools/testing/selftests/lsm/lsm_get_self_attr_test.c
> create mode 100644 tools/testing/selftests/lsm/lsm_list_modules_test.c
> create mode 100644 tools/testing/selftests/lsm/lsm_set_self_attr_test.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 935334123b04..377cc124e615 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19309,6 +19309,7 @@ W: http://kernsec.org/
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm.git
> F: include/uapi/linux/lsm.h
> F: security/
> +F: tools/testing/selftests/lsm/
> X: security/selinux/
>
> SELINUX SECURITY MODULE
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 42806add0114..fc589775ca4c 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -42,6 +42,7 @@ TARGETS += landlock
> TARGETS += lib
> TARGETS += livepatch
> TARGETS += lkdtm
> +TARGETS += lsm
> TARGETS += membarrier
> TARGETS += memfd
> TARGETS += memory-hotplug
> diff --git a/tools/testing/selftests/lsm/.gitignore b/tools/testing/selftests/lsm/.gitignore
> new file mode 100644
> index 000000000000..bd68f6c3fd07
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/.gitignore
> @@ -0,0 +1 @@
> +/*_test
> diff --git a/tools/testing/selftests/lsm/Makefile b/tools/testing/selftests/lsm/Makefile
> new file mode 100644
> index 000000000000..3f80c0bc093d
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/Makefile
> @@ -0,0 +1,17 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# First run: make -C ../../../.. headers_install
> +
> +CFLAGS += -Wall -O2 $(KHDR_INCLUDES)
> +LOCAL_HDRS += common.h
> +
> +TEST_GEN_PROGS := lsm_get_self_attr_test lsm_list_modules_test \
> + lsm_set_self_attr_test
> +
> +include ../lib.mk
> +
> +$(OUTPUT)/lsm_get_self_attr_test: lsm_get_self_attr_test.c common.c
> +$(OUTPUT)/lsm_set_self_attr_test: lsm_set_self_attr_test.c common.c
> +$(OUTPUT)/lsm_list_modules_test: lsm_list_modules_test.c common.c
> +
> +EXTRA_CLEAN = $(OUTPUT)/common.o
> diff --git a/tools/testing/selftests/lsm/common.c b/tools/testing/selftests/lsm/common.c
> new file mode 100644
> index 000000000000..9ad258912646
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/common.c
> @@ -0,0 +1,89 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Linux Security Module infrastructure tests
> + *
> + * Copyright © 2023 Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> + */
> +
> +#define _GNU_SOURCE
> +#include <linux/lsm.h>
> +#include <fcntl.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include "common.h"
> +
> +#define PROCATTR "/proc/self/attr/"
> +
> +int read_proc_attr(const char *attr, char *value, size_t size)
> +{
> + int fd;
> + int len;
> + char *path;
> +
> + len = strlen(PROCATTR) + strlen(attr) + 1;
> + path = calloc(len, 1);
> + if (path == NULL)
> + return -1;
> + sprintf(path, "%s%s", PROCATTR, attr);
> +
> + fd = open(path, O_RDONLY);
> + free(path);
> +
> + if (fd < 0)
> + return -1;
> + len = read(fd, value, size);
> +
> + close(fd);
> +
> + /* Ensure value is terminated */
> + if (len <= 0 || len == size)
> + return -1;
> + value[len] = '\0';
> +
> + path = strchr(value, '\n');
> + if (path)
> + *path = '\0';
> +
> + return 0;
> +}
> +
> +int read_sysfs_lsms(char *lsms, size_t size)
> +{
> + FILE *fp;
> + size_t red;
> +
> + fp = fopen("/sys/kernel/security/lsm", "r");
> + if (fp == NULL)
> + return -1;
> + red = fread(lsms, 1, size, fp);
> + fclose(fp);
> +
> + if (red <= 0 || red == size)
> + return -1;
> + lsms[red] = '\0';
> + return 0;
> +}
> +
> +int attr_lsm_count(void)
> +{
> + char *names = calloc(sysconf(_SC_PAGESIZE), 1);
> + int count = 0;
> +
> + if (!names)
> + return 0;
> +
> + if (read_sysfs_lsms(names, sysconf(_SC_PAGESIZE)))
> + return 0;
> +
> + if (strstr(names, "selinux"))
> + count++;
> + if (strstr(names, "smack"))
> + count++;
> + if (strstr(names, "apparmor"))
> + count++;
> +
> + return count;
> +}
> diff --git a/tools/testing/selftests/lsm/common.h b/tools/testing/selftests/lsm/common.h
> new file mode 100644
> index 000000000000..d404329e5eeb
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/common.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Linux Security Module infrastructure tests
> + *
> + * Copyright © 2023 Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> + */
> +
> +#ifndef lsm_get_self_attr
> +static inline int lsm_get_self_attr(unsigned int attr, struct lsm_ctx *ctx,
> + size_t *size, __u32 flags)
> +{
> + return syscall(__NR_lsm_get_self_attr, attr, ctx, size, flags);
> +}
> +#endif
> +
> +#ifndef lsm_set_self_attr
> +static inline int lsm_set_self_attr(unsigned int attr, struct lsm_ctx *ctx,
> + size_t size, __u32 flags)
> +{
> + return syscall(__NR_lsm_set_self_attr, attr, ctx, size, flags);
> +}
> +#endif
> +
> +#ifndef lsm_list_modules
> +static inline int lsm_list_modules(__u64 *ids, size_t *size, __u32 flags)
> +{
> + return syscall(__NR_lsm_list_modules, ids, size, flags);
> +}
> +#endif
> +
> +extern int read_proc_attr(const char *attr, char *value, size_t size);
> +extern int read_sysfs_lsms(char *lsms, size_t size);
> +int attr_lsm_count(void);
> diff --git a/tools/testing/selftests/lsm/config b/tools/testing/selftests/lsm/config
> new file mode 100644
> index 000000000000..1c0c4c020f9c
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/config
> @@ -0,0 +1,3 @@
> +CONFIG_SYSFS=y
> +CONFIG_SECURITY=y
> +CONFIG_SECURITYFS=y
> diff --git a/tools/testing/selftests/lsm/lsm_get_self_attr_test.c b/tools/testing/selftests/lsm/lsm_get_self_attr_test.c
> new file mode 100644
> index 000000000000..e0e313d9047a
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/lsm_get_self_attr_test.c
> @@ -0,0 +1,275 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Linux Security Module infrastructure tests
> + * Tests for the lsm_get_self_attr system call
> + *
> + * Copyright © 2022 Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> + */
> +
> +#define _GNU_SOURCE
> +#include <linux/lsm.h>
> +#include <fcntl.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include "../kselftest_harness.h"
> +#include "common.h"
> +
> +static struct lsm_ctx *next_ctx(struct lsm_ctx *ctxp)
> +{
> + void *vp;
> +
> + vp = (void *)ctxp + sizeof(*ctxp) + ctxp->ctx_len;
> + return (struct lsm_ctx *)vp;
> +}
> +
> +TEST(size_null_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> +
> + ASSERT_NE(NULL, ctx);
> + errno = 0;
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, NULL, 0));
> + ASSERT_EQ(EINVAL, errno);
> +
> + free(ctx);
> +}
> +
> +TEST(ctx_null_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + size_t size = page_size;
> + int rc;
> +
> + rc = lsm_get_self_attr(LSM_ATTR_CURRENT, NULL, &size, 0);
> +
> + if (attr_lsm_count()) {
> + ASSERT_NE(-1, rc);
> + ASSERT_NE(1, size);
> + } else {
> + ASSERT_EQ(-1, rc);
> + }
> +}
> +
> +TEST(size_too_small_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + size_t size = 1;
> +
> + ASSERT_NE(NULL, ctx);
> + errno = 0;
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size, 0));
> + if (attr_lsm_count()) {
> + ASSERT_EQ(E2BIG, errno);
> + } else {
> + ASSERT_EQ(EOPNOTSUPP, errno);
> + }
> + ASSERT_NE(1, size);
> +
> + free(ctx);
> +}
> +
> +TEST(flags_zero_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + __u64 *syscall_lsms = calloc(page_size, 1);
> + size_t size;
> + int lsmcount;
> + int i;
> +
> + ASSERT_NE(NULL, ctx);
> + errno = 0;
> + size = page_size;
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
> + LSM_FLAG_SINGLE));
> + ASSERT_EQ(EINVAL, errno);
> + ASSERT_EQ(page_size, size);
> +
> + lsmcount = syscall(__NR_lsm_list_modules, syscall_lsms, &size, 0);
> + ASSERT_LE(1, lsmcount);
> + ASSERT_NE(NULL, syscall_lsms);
> +
> + for (i = 0; i < lsmcount; i++) {
> + errno = 0;
> + size = page_size;
> + ctx->id = syscall_lsms[i];
> +
> + if (syscall_lsms[i] == LSM_ID_SELINUX ||
> + syscall_lsms[i] == LSM_ID_SMACK ||
> + syscall_lsms[i] == LSM_ID_APPARMOR) {
> + ASSERT_EQ(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx,
> + &size, LSM_FLAG_SINGLE));
> + } else {
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx,
> + &size,
> + LSM_FLAG_SINGLE));
> + }
> + }
> +
> + free(ctx);
> +}
> +
> +TEST(flags_overset_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + size_t size;
> +
> + ASSERT_NE(NULL, ctx);
> +
> + errno = 0;
> + size = page_size;
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT | LSM_ATTR_PREV, ctx,
> + &size, 0));
> + ASSERT_EQ(EOPNOTSUPP, errno);
> +
> + errno = 0;
> + size = page_size;
> + ASSERT_EQ(-1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
> + LSM_FLAG_SINGLE |
> + (LSM_FLAG_SINGLE << 1)));
> + ASSERT_EQ(EINVAL, errno);
> +
> + free(ctx);
> +}
> +
> +TEST(basic_lsm_get_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + size_t size = page_size;
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + struct lsm_ctx *tctx = NULL;
> + __u64 *syscall_lsms = calloc(page_size, 1);
> + char *attr = calloc(page_size, 1);
> + int cnt_current = 0;
> + int cnt_exec = 0;
> + int cnt_fscreate = 0;
> + int cnt_keycreate = 0;
> + int cnt_prev = 0;
> + int cnt_sockcreate = 0;
> + int lsmcount;
> + int count;
> + int i;
> +
> + ASSERT_NE(NULL, ctx);
> + ASSERT_NE(NULL, syscall_lsms);
> +
> + lsmcount = syscall(__NR_lsm_list_modules, syscall_lsms, &size, 0);
> + ASSERT_LE(1, lsmcount);
> +
> + for (i = 0; i < lsmcount; i++) {
> + switch (syscall_lsms[i]) {
> + case LSM_ID_SELINUX:
> + cnt_current++;
> + cnt_exec++;
> + cnt_fscreate++;
> + cnt_keycreate++;
> + cnt_prev++;
> + cnt_sockcreate++;
> + break;
> + case LSM_ID_SMACK:
> + cnt_current++;
> + break;
> + case LSM_ID_APPARMOR:
> + cnt_current++;
> + cnt_exec++;
> + cnt_prev++;
> + break;
> + default:
> + break;
> + }
> + }
> +
> + if (cnt_current) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size, 0);
> + ASSERT_EQ(cnt_current, count);
> + tctx = ctx;
> + ASSERT_EQ(0, read_proc_attr("current", attr, page_size));
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> + if (cnt_exec) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_EXEC, ctx, &size, 0);
> + ASSERT_GE(cnt_exec, count);
> + if (count > 0) {
> + tctx = ctx;
> + if (read_proc_attr("exec", attr, page_size) == 0)
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + }
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> + if (cnt_fscreate) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_FSCREATE, ctx, &size, 0);
> + ASSERT_GE(cnt_fscreate, count);
> + if (count > 0) {
> + tctx = ctx;
> + if (read_proc_attr("fscreate", attr, page_size) == 0)
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + }
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> + if (cnt_keycreate) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_KEYCREATE, ctx, &size, 0);
> + ASSERT_GE(cnt_keycreate, count);
> + if (count > 0) {
> + tctx = ctx;
> + if (read_proc_attr("keycreate", attr, page_size) == 0)
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + }
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> + if (cnt_prev) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_PREV, ctx, &size, 0);
> + ASSERT_GE(cnt_prev, count);
> + if (count > 0) {
> + tctx = ctx;
> + ASSERT_EQ(0, read_proc_attr("prev", attr, page_size));
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> + }
> + if (cnt_sockcreate) {
> + size = page_size;
> + count = lsm_get_self_attr(LSM_ATTR_SOCKCREATE, ctx, &size, 0);
> + ASSERT_GE(cnt_sockcreate, count);
> + if (count > 0) {
> + tctx = ctx;
> + if (read_proc_attr("sockcreate", attr, page_size) == 0)
> + ASSERT_EQ(0, strcmp((char *)tctx->ctx, attr));
> + }
> + for (i = 1; i < count; i++) {
> + tctx = next_ctx(tctx);
> + ASSERT_NE(0, strcmp((char *)tctx->ctx, attr));
> + }
> + }
> +
> + free(ctx);
> + free(attr);
> + free(syscall_lsms);
> +}
> +
> +TEST_HARNESS_MAIN
> diff --git a/tools/testing/selftests/lsm/lsm_list_modules_test.c b/tools/testing/selftests/lsm/lsm_list_modules_test.c
> new file mode 100644
> index 000000000000..445c02f09c74
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/lsm_list_modules_test.c
> @@ -0,0 +1,140 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Linux Security Module infrastructure tests
> + * Tests for the lsm_list_modules system call
> + *
> + * Copyright © 2022 Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> + */
> +
> +#define _GNU_SOURCE
> +#include <linux/lsm.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include "../kselftest_harness.h"
> +#include "common.h"
> +
> +TEST(size_null_lsm_list_modules)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + __u64 *syscall_lsms = calloc(page_size, 1);
> +
> + ASSERT_NE(NULL, syscall_lsms);
> + errno = 0;
> + ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, NULL, 0));
> + ASSERT_EQ(EFAULT, errno);
> +
> + free(syscall_lsms);
> +}
> +
> +TEST(ids_null_lsm_list_modules)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + size_t size = page_size;
> +
> + errno = 0;
> + ASSERT_EQ(-1, lsm_list_modules(NULL, &size, 0));
> + ASSERT_EQ(EFAULT, errno);
> + ASSERT_NE(1, size);
> +}
> +
> +TEST(size_too_small_lsm_list_modules)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + __u64 *syscall_lsms = calloc(page_size, 1);
> + size_t size = 1;
> +
> + ASSERT_NE(NULL, syscall_lsms);
> + errno = 0;
> + ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, &size, 0));
> + ASSERT_EQ(E2BIG, errno);
> + ASSERT_NE(1, size);
> +
> + free(syscall_lsms);
> +}
> +
> +TEST(flags_set_lsm_list_modules)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + __u64 *syscall_lsms = calloc(page_size, 1);
> + size_t size = page_size;
> +
> + ASSERT_NE(NULL, syscall_lsms);
> + errno = 0;
> + ASSERT_EQ(-1, lsm_list_modules(syscall_lsms, &size, 7));
> + ASSERT_EQ(EINVAL, errno);
> + ASSERT_EQ(page_size, size);
> +
> + free(syscall_lsms);
> +}
> +
> +TEST(correct_lsm_list_modules)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + size_t size = page_size;
> + __u64 *syscall_lsms = calloc(page_size, 1);
> + char *sysfs_lsms = calloc(page_size, 1);
> + char *name;
> + char *cp;
> + int count;
> + int i;
> +
> + ASSERT_NE(NULL, sysfs_lsms);
> + ASSERT_NE(NULL, syscall_lsms);
> + ASSERT_EQ(0, read_sysfs_lsms(sysfs_lsms, page_size));
> +
> + count = lsm_list_modules(syscall_lsms, &size, 0);
> + ASSERT_LE(1, count);
> + cp = sysfs_lsms;
> + for (i = 0; i < count; i++) {
> + switch (syscall_lsms[i]) {
> + case LSM_ID_CAPABILITY:
> + name = "capability";
> + break;
> + case LSM_ID_SELINUX:
> + name = "selinux";
> + break;
> + case LSM_ID_SMACK:
> + name = "smack";
> + break;
> + case LSM_ID_TOMOYO:
> + name = "tomoyo";
> + break;
> + case LSM_ID_IMA:
> + name = "ima";
> + break;
> + case LSM_ID_APPARMOR:
> + name = "apparmor";
> + break;
> + case LSM_ID_YAMA:
> + name = "yama";
> + break;
> + case LSM_ID_LOADPIN:
> + name = "loadpin";
> + break;
> + case LSM_ID_SAFESETID:
> + name = "safesetid";
> + break;
> + case LSM_ID_LOCKDOWN:
> + name = "lockdown";
> + break;
> + case LSM_ID_BPF:
> + name = "bpf";
> + break;
> + case LSM_ID_LANDLOCK:
> + name = "landlock";
> + break;
> + default:
> + name = "INVALID";
> + break;
> + }
> + ASSERT_EQ(0, strncmp(cp, name, strlen(name)));
> + cp += strlen(name) + 1;
> + }
> +
> + free(sysfs_lsms);
> + free(syscall_lsms);
> +}
> +
> +TEST_HARNESS_MAIN
> diff --git a/tools/testing/selftests/lsm/lsm_set_self_attr_test.c b/tools/testing/selftests/lsm/lsm_set_self_attr_test.c
> new file mode 100644
> index 000000000000..e9712c6cf596
> --- /dev/null
> +++ b/tools/testing/selftests/lsm/lsm_set_self_attr_test.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Linux Security Module infrastructure tests
> + * Tests for the lsm_set_self_attr system call
> + *
> + * Copyright © 2022 Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> + */
> +
> +#define _GNU_SOURCE
> +#include <linux/lsm.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include "../kselftest_harness.h"
> +#include "common.h"
> +
> +TEST(ctx_null_lsm_set_self_attr)
> +{
> + ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, NULL,
> + sizeof(struct lsm_ctx), 0));
> +}
> +
> +TEST(size_too_small_lsm_set_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + size_t size = page_size;
> +
> + ASSERT_NE(NULL, ctx);
> + if (attr_lsm_count()) {
> + ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
> + 0));
> + }
> + ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, 1, 0));
> +
> + free(ctx);
> +}
> +
> +TEST(flags_zero_lsm_set_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + struct lsm_ctx *ctx = calloc(page_size, 1);
> + size_t size = page_size;
> +
> + ASSERT_NE(NULL, ctx);
> + if (attr_lsm_count()) {
> + ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, &size,
> + 0));
> + }
> + ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT, ctx, size, 1));
> +
> + free(ctx);
> +}
> +
> +TEST(flags_overset_lsm_set_self_attr)
> +{
> + const long page_size = sysconf(_SC_PAGESIZE);
> + char *ctx = calloc(page_size, 1);
> + size_t size = page_size;
> + struct lsm_ctx *tctx = (struct lsm_ctx *)ctx;
> +
> + ASSERT_NE(NULL, ctx);
> + if (attr_lsm_count()) {
> + ASSERT_LE(1, lsm_get_self_attr(LSM_ATTR_CURRENT, tctx, &size,
> + 0));
> + }
> + ASSERT_EQ(-1, lsm_set_self_attr(LSM_ATTR_CURRENT | LSM_ATTR_PREV, tctx,
> + size, 0));
> +
> + free(ctx);
> +}
> +
> +TEST_HARNESS_MAIN
> --
> 2.41.0
>

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