kernel: fix build

kernel/seccomp_cache.c

@@ -12,127 +12,6 @@
 #include "klog.h" // IWYU pragma: keep
 #include "seccomp_cache.h"
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) ||    \
-    defined(CONFIG_IS_HW_HISI) ||    \
-    defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
-#include <linux/key.h>
-#include <linux/errno.h>
-#include <linux/cred.h>
-struct key *init_session_keyring = NULL;
-
-static inline int install_session_keyring(struct key *keyring)
-{
-    struct cred *new;
-    int ret;
-
-    new = prepare_creds();
-    if (!new)
-        return -ENOMEM;
-
-    ret = install_session_keyring_to_cred(new, keyring);
-    if (ret < 0) {
-        abort_creds(new);
-        return ret;
-    }
-
-    return commit_creds(new);
-}
-#endif
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) || defined(KSU_OPTIONAL_STRNCPY)
-long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
-                   long count)
-{
-    return strncpy_from_user_nofault(dst, unsafe_addr, count);
-}
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 3, 0)
-long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
-                   long count)
-{
-    return strncpy_from_unsafe_user(dst, unsafe_addr, count);
-}
-#else
-// Copied from: https://elixir.bootlin.com/linux/v4.9.337/source/mm/maccess.c#L201
-long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
-                   long count)
-{
-    mm_segment_t old_fs = get_fs();
-    long ret;
-
-    if (unlikely(count <= 0))
-        return 0;
-
-    set_fs(USER_DS);
-    pagefault_disable();
-    ret = strncpy_from_user(dst, unsafe_addr, count);
-    pagefault_enable();
-    set_fs(old_fs);
-
-    if (ret >= count) {
-        ret = count;
-        dst[ret - 1] = '\0';
-    } else if (ret > 0) {
-        ret++;
-    }
-
-    return ret;
-}
-#endif
-
-long ksu_strncpy_from_user_retry(char *dst, const void __user *unsafe_addr,
-                   long count)
-{
-    long ret;
-
-    ret = ksu_strncpy_from_user_nofault(dst, unsafe_addr, count);
-    if (likely(ret >= 0))
-        return ret;
-
-    // we faulted! fallback to slow path
-    if (unlikely(!ksu_access_ok(unsafe_addr, count))) {
-#ifdef CONFIG_KSU_DEBUG
-        pr_err("%s: faulted!\n", __func__);
-#endif
-        return -EFAULT;
-    }
-
-    // why we don't do like how strncpy_from_user_nofault?
-    ret = strncpy_from_user(dst, unsafe_addr, count);
-
-    if (ret >= count) {
-        ret = count;
-        dst[ret - 1] = '\0';
-    } else if (likely(ret >= 0)) {
-        ret++;
-    }
-
-    return ret;
-}
-
-long ksu_copy_from_user_nofault(void *dst, const void __user *src, size_t size)
-{
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
-    return copy_from_user_nofault(dst, src, size);
-#else
-    // https://elixir.bootlin.com/linux/v5.8/source/mm/maccess.c#L205
-    long ret = -EFAULT;
-    mm_segment_t old_fs = get_fs();
-
-    set_fs(USER_DS);
-    // tweaked to use ksu_access_ok
-    if (ksu_access_ok(src, size)) {
-        pagefault_disable();
-        ret = __copy_from_user_inatomic(dst, src, size);
-        pagefault_enable();
-    }
-    set_fs(old_fs);
-
-    if (ret)
-        return -EFAULT;
-    return 0;
-#endif
-}
-
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 2) // Android backport this feature in 5.10.2
 struct action_cache {
     DECLARE_BITMAP(allow_native, NR_syscalls);