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kernel: implement v2_signature size/hash override from userspace through kernel module parameter

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- /sys/module/kernelsu/parameters/expected_manager_*
This commit is contained in:
Rifat Azad
2025-07-19 23:10:48 +06:00
parent 4382dca515
commit d61de07c21
2 changed files with 67 additions and 11 deletions
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62
kernel/apk_sign.c
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@@ -3,10 +3,9 @@
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/version.h>
#ifdef CONFIG_KSU_DEBUG
#include <linux/moduleparam.h>
#endif
#include <crypto/hash.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
#include <crypto/sha2.h>
@@ -19,6 +18,8 @@
#include "kernel_compat.h"
#include "throne_tracker.h"
static unsigned int expected_manager_size = EXPECTED_MANAGER_SIZE;
static char expected_manager_hash[SHA256_DIGEST_SIZE * 2 + 1] = EXPECTED_MANAGER_HASH;
struct sdesc {
struct shash_desc shash;
@@ -313,6 +314,53 @@ static struct kernel_param_ops expected_size_ops = {
module_param_cb(ksu_debug_manager_uid, &expected_size_ops,
&ksu_debug_manager_uid, S_IRUSR | S_IWUSR);
#else
static int set_expected_size(const char *val, const struct kernel_param *kp)
{
int rv = param_set_uint(val, kp);
pr_info("expected_manager_size set to %u\n", expected_manager_size);
return rv;
}
static int get_expected_size(char *buf, const struct kernel_param *kp)
{
return snprintf(buf, PAGE_SIZE, "%u\n", expected_manager_size);
}
static int set_expected_hash(const char *val, const struct kernel_param *kp)
{
if (strlen(val) != SHA256_DIGEST_SIZE * 2) {
pr_err("Invalid hash length: %s\n", val);
return -EINVAL;
}
strncpy(expected_manager_hash, val, SHA256_DIGEST_SIZE * 2);
expected_manager_hash[SHA256_DIGEST_SIZE * 2] = '\0';
pr_info("expected_manager_hash set to %s\n", expected_manager_hash);
return 0;
}
static int get_expected_hash(char *buf, const struct kernel_param *kp)
{
return snprintf(buf, PAGE_SIZE, "%s\n", expected_manager_hash);
}
static struct kernel_param_ops expected_size_ops = {
.set = set_expected_size,
.get = get_expected_size,
};
static struct kernel_param_ops expected_hash_ops = {
.set = set_expected_hash,
.get = get_expected_hash,
};
module_param_cb(expected_manager_size, &expected_size_ops, &expected_manager_size, 0644);
module_param_cb(expected_manager_hash, &expected_hash_ops, &expected_manager_hash, 0644);
#endif
bool is_manager_apk(char *path)
@@ -333,5 +381,13 @@ bool is_manager_apk(char *path)
return false;
}
return check_v2_signature(path, EXPECTED_NEXT_SIZE, EXPECTED_NEXT_HASH);
// set debug info to print size and hash to kernel log
pr_info("%s: expected size: %u, expected hash: %s\n",
path, expected_manager_size, expected_manager_hash);
#ifdef CONFIG_KSU_DEBUG
return check_v2_signature(path, EXPECTED_MANAGER_SIZE, EXPECTED_MANAGER_HASH);
#else
return check_v2_signature(path, expected_manager_size, expected_manager_hash);
#endif
}