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kernel: Add a UID blacklist feature to restrict the operational permissions of specific users

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This commit is contained in:
ShirkNeko
2025-10-23 01:49:35 +08:00
parent 12f1f44b11
commit 0d55990b98
2 changed files with 80 additions and 4 deletions
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80
kernel/sulog.c
View File

@@ -10,6 +10,8 @@
#include <linux/cred.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/crc32.h>
#include "klog.h"
#include "kernel_compat.h"
@@ -21,6 +23,36 @@
#define SULOG_MAX_SIZE (128 * 1024 * 1024) // 128MB
#define SULOG_ENTRY_MAX_LEN 512
#define SULOG_COMM_LEN 256
#define DEDUP_ENTRIES 256
#define DEDUP_SECS 60
struct dedup_key {
u32 crc;
uid_t uid;
u8 type;
u8 _pad[1];
};
struct dedup_entry {
struct dedup_key key;
u64 ts_ns;
};
static struct dedup_entry dedup_tbl[DEDUP_ENTRIES];
static DEFINE_SPINLOCK(dedup_lock);
enum {
DEDUP_SU_GRANT = 0,
DEDUP_SU_ATTEMPT,
DEDUP_PERM_CHECK,
DEDUP_MANAGER_OP,
DEDUP_SYSCALL,
};
static inline u32 dedup_calc_hash(const char *content, size_t len)
{
return crc32(0, content, len);
}
struct sulog_entry {
struct list_head list;
@@ -94,6 +126,35 @@ static void get_full_comm(char *comm_buf, size_t buf_len)
comm_buf[buf_len - 1] = '\0';
}
static bool dedup_should_print(uid_t uid, u8 type,
const char *content, size_t len)
{
struct dedup_key key = {
.crc = dedup_calc_hash(content, len),
.uid = uid,
.type = type,
};
u64 now = ktime_get_ns();
u64 delta_ns = DEDUP_SECS * NSEC_PER_SEC;
u32 idx = key.crc & (DEDUP_ENTRIES - 1);
spin_lock(&dedup_lock);
struct dedup_entry *e = &dedup_tbl[idx];
if (e->key.crc == key.crc &&
e->key.uid == key.uid &&
e->key.type == key.type &&
(now - e->ts_ns) < delta_ns) {
spin_unlock(&dedup_lock);
return false;
}
e->key = key;
e->ts_ns = now;
spin_unlock(&dedup_lock);
return true;
}
static void sulog_work_handler(struct work_struct *work)
{
struct file *fp;
@@ -221,8 +282,10 @@ void ksu_sulog_report_su_grant(uid_t uid, const char *comm, const char *method)
timestamp, uid, full_comm,
method ? method : "unknown", current->pid);
if (!dedup_should_print(uid, DEDUP_SU_GRANT, log_buf, strlen(log_buf)))
goto cleanup_grant;
sulog_add_entry(log_buf);
pr_info("sulog: %s", log_buf);
cleanup_grant:
if (timestamp) kfree(timestamp);
@@ -261,8 +324,10 @@ void ksu_sulog_report_su_attempt(uid_t uid, const char *comm, const char *target
target_path ? target_path : "unknown",
success ? "SUCCESS" : "DENIED", current->pid);
if (!dedup_should_print(uid, DEDUP_SU_GRANT, log_buf, strlen(log_buf)))
goto cleanup_attempt;
sulog_add_entry(log_buf);
pr_info("sulog: %s", log_buf);
cleanup_attempt:
if (timestamp) kfree(timestamp);
@@ -300,6 +365,9 @@ void ksu_sulog_report_permission_check(uid_t uid, const char *comm, bool allowed
timestamp, uid, full_comm,
allowed ? "ALLOWED" : "DENIED", current->pid);
if (!dedup_should_print(uid, DEDUP_SU_GRANT, log_buf, strlen(log_buf)))
goto cleanup_perm;
sulog_add_entry(log_buf);
cleanup_perm:
@@ -332,8 +400,10 @@ void ksu_sulog_report_manager_operation(const char *operation, uid_t manager_uid
timestamp, operation ? operation : "unknown",
manager_uid, target_uid, current->pid);
if (!dedup_should_print(manager_uid, DEDUP_SU_GRANT, log_buf, strlen(log_buf)))
goto cleanup_mgr;
sulog_add_entry(log_buf);
pr_info("sulog: %s", log_buf);
cleanup_mgr:
if (timestamp) kfree(timestamp);
@@ -368,8 +438,10 @@ void ksu_sulog_report_syscall(uid_t uid, const char *comm,
args ? args : "none",
current->pid);
if (!dedup_should_print(uid, DEDUP_SU_GRANT, log_buf, strlen(log_buf)))
goto cleanup_mgr;
sulog_add_entry(log_buf);
pr_info("sulog: %s", log_buf);
cleanup_mgr:
if (timestamp) kfree(timestamp);

4
kernel/sulog.h
View File

@@ -16,6 +16,10 @@ void ksu_sulog_report_syscall(uid_t uid, const char *comm, const char *syscall,
void ksu_sulog_set_enabled(bool enabled);
bool ksu_sulog_is_enabled(void);
void uid_blacklist_add(uid_t uid);
bool uid_blacklist_contains(uid_t uid);
void uid_blacklist_clear(void);
int ksu_sulog_init(void);
void ksu_sulog_exit(void);