125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
#include <linux/version.h>
|
|
#include <linux/fs.h>
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
|
|
#include <linux/sched/task.h>
|
|
#else
|
|
#include <linux/sched.h>
|
|
#endif
|
|
#include <linux/uaccess.h>
|
|
#include "klog.h" // IWYU pragma: keep
|
|
#include "kernel_compat.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>
|
|
#include <linux/lsm_hooks.h>
|
|
|
|
extern int install_session_keyring_to_cred(struct cred *, struct key *);
|
|
struct key *init_session_keyring = NULL;
|
|
|
|
static 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
|
|
|
|
struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
|
|
{
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || \
|
|
defined(CONFIG_IS_HW_HISI) || defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
|
|
if (init_session_keyring != NULL && !current_cred()->session_keyring &&
|
|
(current->flags & PF_WQ_WORKER)) {
|
|
pr_info("installing init session keyring for older kernel\n");
|
|
install_session_keyring(init_session_keyring);
|
|
}
|
|
#endif
|
|
return filp_open(filename, flags, mode);
|
|
}
|
|
|
|
ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
|
|
loff_t *pos)
|
|
{
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0) || \
|
|
defined(KSU_OPTIONAL_KERNEL_READ)
|
|
return kernel_read(p, buf, count, pos);
|
|
#else
|
|
loff_t offset = pos ? *pos : 0;
|
|
ssize_t result = kernel_read(p, offset, (char *)buf, count);
|
|
if (pos && result > 0) {
|
|
*pos = offset + result;
|
|
}
|
|
return result;
|
|
#endif
|
|
}
|
|
|
|
ssize_t ksu_kernel_write_compat(struct file *p, const void *buf, size_t count,
|
|
loff_t *pos)
|
|
{
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0) || \
|
|
defined(KSU_OPTIONAL_KERNEL_WRITE)
|
|
return kernel_write(p, buf, count, pos);
|
|
#else
|
|
loff_t offset = pos ? *pos : 0;
|
|
ssize_t result = kernel_write(p, buf, count, offset);
|
|
if (pos && result > 0) {
|
|
*pos = offset + result;
|
|
}
|
|
return result;
|
|
#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 |