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// SPDX-License-Identifier: GPL-2.0+
/*
* Tests for FIT dm-verity cmdline generation
*
* Copyright 2026 Daniel Golle <[email protected]>
*/
#include <image.h>
#include <test/test.h>
#include <test/ut.h>
#define FIT_VERITY_TEST(_name, _flags) UNIT_TEST(_name, _flags, fit_verity)
/* FIT blob buffer size — generous to avoid FDT_ERR_NOSPACE */
#define FIT_BUF_SIZE 4096
/* Test digest (32 bytes = sha256) */
static const u8 test_digest[32] = {
0x8e, 0x67, 0x91, 0x63, 0x7f, 0x93, 0xcb, 0xb8,
0x1f, 0xc4, 0x52, 0x99, 0xe2, 0x03, 0xcb, 0xe8,
0x5c, 0xa2, 0xe4, 0x7a, 0x38, 0xf5, 0x05, 0x1b,
0xdd, 0xee, 0xce, 0x92, 0xd7, 0xb1, 0xc9, 0xf9,
};
/* Test salt (32 bytes) */
static const u8 test_salt[32] = {
0xaa, 0x7b, 0x11, 0xf8, 0xdb, 0x8f, 0xe2, 0xe5,
0xbf, 0xd4, 0xec, 0xa1, 0xd1, 0x8a, 0x22, 0xb5,
0xde, 0x7e, 0xa3, 0x9d, 0x2e, 0x1b, 0x93, 0xbb,
0x72, 0x72, 0xce, 0x0c, 0x6c, 0xa3, 0xcc, 0x8e,
};
/**
* build_verity_fit() - construct a minimal FIT blob with dm-verity metadata
* @buf: output buffer (at least FIT_BUF_SIZE bytes)
* @num_loadables: number of filesystem loadables to create (1 or 2)
*
* Builds a FIT blob containing:
* - /images/rootfsN with type="filesystem" and a dm-verity subnode
* - /configurations/conf-1 referencing the loadable(s)
*
* Return: configuration node offset, or -ve on error
*/
static int build_verity_fit(void *buf, int num_loadables)
{
int images_node, conf_node, confs_node, img_node, verity_node;
fdt32_t val;
int ret, i;
char name[32];
/*
* Build the loadables string list. FDT stringlists are concatenated
* NUL-terminated strings. E.g. "rootfs0\0rootfs1\0"
*/
char loadables[128];
int loadables_len = 0;
ret = fdt_create_empty_tree(buf, FIT_BUF_SIZE);
if (ret)
return ret;
/* /images */
images_node = fdt_add_subnode(buf, 0, "images");
if (images_node < 0)
return images_node;
for (i = 0; i < num_loadables; i++) {
snprintf(name, sizeof(name), "rootfs%d", i);
img_node = fdt_add_subnode(buf, images_node, name);
if (img_node < 0)
return img_node;
ret = fdt_setprop_string(buf, img_node, FIT_TYPE_PROP,
"filesystem");
if (ret)
return ret;
verity_node = fdt_add_subnode(buf, img_node,
FIT_VERITY_NODENAME);
if (verity_node < 0)
return verity_node;
ret = fdt_setprop_string(buf, verity_node,
FIT_VERITY_ALGO_PROP, "sha256");
if (ret)
return ret;
val = cpu_to_fdt32(4096);
ret = fdt_setprop(buf, verity_node, FIT_VERITY_DBS_PROP,
&val, sizeof(val));
if (ret)
return ret;
ret = fdt_setprop(buf, verity_node, FIT_VERITY_HBS_PROP,
&val, sizeof(val));
if (ret)
return ret;
val = cpu_to_fdt32(100);
ret = fdt_setprop(buf, verity_node, FIT_VERITY_NBLK_PROP,
&val, sizeof(val));
if (ret)
return ret;
val = cpu_to_fdt32(100);
ret = fdt_setprop(buf, verity_node, FIT_VERITY_HBLK_PROP,
&val, sizeof(val));
if (ret)
return ret;
ret = fdt_setprop(buf, verity_node, FIT_VERITY_DIGEST_PROP,
test_digest, sizeof(test_digest));
if (ret)
return ret;
ret = fdt_setprop(buf, verity_node, FIT_VERITY_SALT_PROP,
test_salt, sizeof(test_salt));
if (ret)
return ret;
/* Append to loadables stringlist */
loadables_len += snprintf(loadables + loadables_len,
sizeof(loadables) - loadables_len,
"%s", name) + 1;
}
/* /configurations/conf-1 */
confs_node = fdt_add_subnode(buf, 0, "configurations");
if (confs_node < 0)
return confs_node;
conf_node = fdt_add_subnode(buf, confs_node, "conf-1");
if (conf_node < 0)
return conf_node;
ret = fdt_setprop(buf, conf_node, FIT_LOADABLE_PROP,
loadables, loadables_len);
if (ret)
return ret;
return conf_node;
}
/* Test: single dm-verity loadable produces correct cmdline fragments */
static int fit_verity_test_single(struct unit_test_state *uts)
{
char buf[FIT_BUF_SIZE];
struct bootm_headers images;
int conf_noffset;
conf_noffset = build_verity_fit(buf, 1);
ut_assert(conf_noffset >= 0);
memset(&images, 0, sizeof(images));
ut_assertok(fit_verity_build_cmdline(buf, conf_noffset, &images));
/* dm_mod_create should contain the target spec for rootfs0 */
ut_assertnonnull(images.dm_mod_create);
ut_assert(strstr(images.dm_mod_create, "rootfs0,,,"));
ut_assert(strstr(images.dm_mod_create, "verity 1"));
ut_assert(strstr(images.dm_mod_create, "/dev/fit0"));
ut_assert(strstr(images.dm_mod_create, "4096 4096 100 100"));
ut_assert(strstr(images.dm_mod_create, "sha256"));
/* Check hex-encoded digest prefix */
ut_assert(strstr(images.dm_mod_create, "8e6791637f93cbb8"));
/* Check hex-encoded salt prefix */
ut_assert(strstr(images.dm_mod_create, "aa7b11f8db8fe2e5"));
/* dm_mod_waitfor should reference /dev/fit0 */
ut_assertnonnull(images.dm_mod_waitfor);
ut_asserteq_str("/dev/fit0", images.dm_mod_waitfor);
fit_verity_free(&images);
ut_assertnull(images.dm_mod_create);
ut_assertnull(images.dm_mod_waitfor);
return 0;
}
FIT_VERITY_TEST(fit_verity_test_single, 0);
/* Test: FIT with no dm-verity subnode returns 0, pointers stay NULL */
static int fit_verity_test_no_verity(struct unit_test_state *uts)
{
char buf[FIT_BUF_SIZE];
struct bootm_headers images;
int conf_node, images_node, img_node, confs_node;
int ret;
ret = fdt_create_empty_tree(buf, FIT_BUF_SIZE);
ut_assertok(ret);
images_node = fdt_add_subnode(buf, 0, "images");
ut_assert(images_node >= 0);
img_node = fdt_add_subnode(buf, images_node, "rootfs");
ut_assert(img_node >= 0);
ut_assertok(fdt_setprop_string(buf, img_node, FIT_TYPE_PROP,
"filesystem"));
/* No dm-verity subnode */
confs_node = fdt_add_subnode(buf, 0, "configurations");
ut_assert(confs_node >= 0);
conf_node = fdt_add_subnode(buf, confs_node, "conf-1");
ut_assert(conf_node >= 0);
ut_assertok(fdt_setprop_string(buf, conf_node, FIT_LOADABLE_PROP,
"rootfs"));
memset(&images, 0, sizeof(images));
ut_asserteq(0, fit_verity_build_cmdline(buf, conf_node, &images));
ut_assertnull(images.dm_mod_create);
ut_assertnull(images.dm_mod_waitfor);
return 0;
}
FIT_VERITY_TEST(fit_verity_test_no_verity, 0);
/* Test: two dm-verity loadables produce combined cmdline */
static int fit_verity_test_two_loadables(struct unit_test_state *uts)
{
char buf[FIT_BUF_SIZE];
struct bootm_headers images;
int conf_noffset;
conf_noffset = build_verity_fit(buf, 2);
ut_assert(conf_noffset >= 0);
memset(&images, 0, sizeof(images));
ut_assertok(fit_verity_build_cmdline(buf, conf_noffset, &images));
/* Both targets should appear, separated by ";" */
ut_assertnonnull(images.dm_mod_create);
ut_assert(strstr(images.dm_mod_create, "rootfs0,,,"));
ut_assert(strstr(images.dm_mod_create, ";rootfs1,,,"));
ut_assert(strstr(images.dm_mod_create, "/dev/fit0"));
ut_assert(strstr(images.dm_mod_create, "/dev/fit1"));
/* dm_mod_waitfor should list both devices */
ut_assertnonnull(images.dm_mod_waitfor);
ut_assert(strstr(images.dm_mod_waitfor, "/dev/fit0"));
ut_assert(strstr(images.dm_mod_waitfor, "/dev/fit1"));
fit_verity_free(&images);
return 0;
}
FIT_VERITY_TEST(fit_verity_test_two_loadables, 0);
/* Test: invalid block size (not power of two) returns -EINVAL */
static int fit_verity_test_bad_blocksize(struct unit_test_state *uts)
{
char buf[FIT_BUF_SIZE];
struct bootm_headers images;
int images_node, conf_node, confs_node, img_node, verity_node;
fdt32_t val;
int ret;
ret = fdt_create_empty_tree(buf, FIT_BUF_SIZE);
ut_assertok(ret);
images_node = fdt_add_subnode(buf, 0, "images");
ut_assert(images_node >= 0);
img_node = fdt_add_subnode(buf, images_node, "rootfs");
ut_assert(img_node >= 0);
ut_assertok(fdt_setprop_string(buf, img_node, FIT_TYPE_PROP,
"filesystem"));
verity_node = fdt_add_subnode(buf, img_node, FIT_VERITY_NODENAME);
ut_assert(verity_node >= 0);
ut_assertok(fdt_setprop_string(buf, verity_node,
FIT_VERITY_ALGO_PROP, "sha256"));
/* 3000 is not a power of two */
val = cpu_to_fdt32(3000);
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_DBS_PROP,
&val, sizeof(val)));
val = cpu_to_fdt32(4096);
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_HBS_PROP,
&val, sizeof(val)));
val = cpu_to_fdt32(100);
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_NBLK_PROP,
&val, sizeof(val)));
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_HBLK_PROP,
&val, sizeof(val)));
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_DIGEST_PROP,
test_digest, sizeof(test_digest)));
ut_assertok(fdt_setprop(buf, verity_node, FIT_VERITY_SALT_PROP,
test_salt, sizeof(test_salt)));
confs_node = fdt_add_subnode(buf, 0, "configurations");
ut_assert(confs_node >= 0);
conf_node = fdt_add_subnode(buf, confs_node, "conf-1");
ut_assert(conf_node >= 0);
ut_assertok(fdt_setprop_string(buf, conf_node, FIT_LOADABLE_PROP,
"rootfs"));
memset(&images, 0, sizeof(images));
ut_asserteq(-EINVAL, fit_verity_build_cmdline(buf, conf_node, &images));
ut_assertnull(images.dm_mod_create);
ut_assertnull(images.dm_mod_waitfor);
return 0;
}
FIT_VERITY_TEST(fit_verity_test_bad_blocksize, 0);
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