static void
km_remove_ext4_mod(
const char* const data
)
{
unsigned long cr0 = disable_wp();
km_ext4_ops_remove_readdir();
restore_wp( cr0 );
}
void
cleanup_module(void)
{
disable_wp();
UNHOOK_SYS_CALL_TABLE(open);
UNHOOK_SYS_CALL_TABLE(unlink);
UNHOOK_SYS_CALL_TABLE(unlinkat);
enable_wp();
fm_alert("%s\n", "Farewell the World!");
return;
}
int
init_module(void)
{
fm_alert("%s\n", "Greetings the World!");
/* No consideration on failure. */
real_sys_call_table = get_sct();
disable_wp();
HOOK_SYS_CALL_TABLE(open);
HOOK_SYS_CALL_TABLE(unlink);
HOOK_SYS_CALL_TABLE(unlinkat);
enable_wp();
return 0;
}
/*
* Write bytes to kernel address space for debugger.
* We need to disable write protection temporarily so we can write
* things (such as break points) that might be in write-protected
* memory.
*/
int
db_write_bytes(vm_offset_t addr, size_t size, char *data)
{
jmp_buf jb;
void *prev_jb;
char *dst;
bool old_wp;
int ret;
old_wp = false;
prev_jb = kdb_jmpbuf(jb);
ret = setjmp(jb);
if (ret == 0) {
old_wp = disable_wp();
dst = (char *)addr;
while (size-- > 0)
*dst++ = *data++;
}
restore_wp(old_wp);
(void)kdb_jmpbuf(prev_jb);
return (ret);
}
void
enable_kernel_write(void)
{
disable_interrupts();
disable_wp();
}