struct syscall_exec_desc * find_syscall(char *name, struct parasite_ctl *ctl)
{
if (compel_mode_native(ctl))
return find_syscall_table(name, sc_exec_table_64);
else
return find_syscall_table(name, sc_exec_table_32);
}
int efab_linux_trampoline_debug (ci_uintptr_t *param)
{
unsigned long op = *param;
void *p;
TRAMP_DEBUG("Trampoline debug op=%lx", op);
(void)op;
*param = (unsigned long)find_syscall_table(&p);
return 0;
}
struct syscall_exec_desc *
find_syscall(char *name, __always_unused struct parasite_ctl *ctl)
{
return find_syscall_table(name, sc_exec_table_64);
}
static int hook_sys_call()
{
long offset;
unsigned long inst;
unsigned long flags;
syscall_table_addr = find_syscall_table();
if (!syscall_table_addr) {
printk("can not find sys_call_table address!!\n");
return 1;
}
printk("find sys_call_table address: %p\n", syscall_table_addr);
rel_sys_open = syscall_table_addr[__NR_open];
printk("rel_sys_open address = 0x%08x\n", rel_sys_open);
rel_sys_close = syscall_table_addr[__NR_close];
printk("rel_sys_close address = 0x%08x\n", rel_sys_close);
execve_wrapper = syscall_table_addr[__NR_execve];
printk("execve_wrapper address = 0x%08x\n", execve_wrapper);
rel_sys_creat = syscall_table_addr[__NR_creat];
printk("rel_sys_creat address = 0x%08x\n", rel_sys_creat);
if (mem_text_wp) {
MEM_TXT_BEGIN(&syscall_table_addr[__NR_open], flags);
syscall_table_addr[__NR_open] = hook_sys_open;
MEM_TXT_END(flags);
printk("hook_sys_open addr: %p\n", hook_sys_open);
MEM_TXT_BEGIN(&syscall_table_addr[__NR_close], flags);
syscall_table_addr[__NR_close] = hook_sys_close;
MEM_TXT_END(flags);
printk("hook_sys_close addr: %p\n", hook_sys_close);
/* find sys_execve address */
b_addr = (unsigned long *)((unsigned char *)execve_wrapper + 4);
orig_inst = *b_addr;
offset = orig_inst & BOFF_MASK;
printk("offset = 0x%08x\n", offset);
rel_sys_execve = execve_wrapper + 0xc + (offset << 2);
printk("rel_sys_execve address = 0x%08x\n", rel_sys_execve);
/* hook sys_execve by modify offset*/
offset = (unsigned long)hook_sys_execve - execve_wrapper - 0xc;
offset >>= 2;
printk("new offset(10) = %ld, HEX: 0x%08x\n", offset, offset);
printk("hook_sys_execve addr: %p\n", hook_sys_execve);
inst = (orig_inst & ~BOFF_MASK) | (offset & BOFF_MASK);
printk("new inst = 0x%08x\n", inst);
MEM_TXT_BEGIN(b_addr, flags);
*b_addr = inst;
MEM_TXT_END(flags);
printk("hook sys_execve success!\n");
MEM_TXT_BEGIN(&syscall_table_addr[__NR_creat], flags);
syscall_table_addr[__NR_creat] = hook_sys_creat;
MEM_TXT_END(flags);
printk("hook_sys_creat addr: %p\n", hook_sys_creat);
}
else {
