ARM Linux許可權記憶體控制的實現

ARM Linux許可權記憶體控制的實現

early_trap_init->modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
設定USER MODE的domain許可權為client(01)

根據建立的page maps表設定0xc0000000開始的地址SVC模式讀寫，USR模式不能讀寫

gdb dump memory的命令如下:(struct thread_info *)0xc033a000 = (struct task_struct *)->stack
(gdb) x/32wx 0xc033a000 
0xc033a000 <init_thread_union>:
0x00000000 0x00000000
0x00000000         0xc033e0c8 (struct task_struct *)
0xc033a010 <init_thread_union+16>: 0xc0341cec
0x00000000 0x00000017(CPU domain)
0x00000000
0xc033a020 <init_thread_union+32>: 0x00000000
0x00000000 0x00000000
        0x00000000
0xc033a030 <init_thread_union+48>: 0x00000000
0x00000000 0x00000000
        0x00000000
0xc033a040 <init_thread_union+64>: 0x00000000
0x00000000 0x00000000
        0x00000000
0xc033a050 <init_thread_union+80>: 0x00000000
0x00000000 0x00000000
        0x00000000
0xc033a060 <init_thread_union+96>: 0x00000000
0x00000000 0x00000000
        0x00000000

#define DOMAIN_KERNEL
0 DOMAIN_MANAGER
#define DOMAIN_TABLE
0
#define DOMAIN_USER
1 DOMAIN_CLIENT
#define DOMAIN_IO
2 DOMAIN_CLIENT

註：x/32wx為顯示32個單位,單位為w（word）,以十六進位顯示