保护应用程序（2）

27_day/Makefile

@@ -164,10 +164,17 @@ color2.bim : color2.obj a_nask.obj Makefile
 color2.hrb : color2.bim Makefile
 	$(BIM2HRB) color2.bim color2.hrb 56k
 
+crack7.bim : crack7.obj Makefile
+	$(OBJ2BIM) @$(RULEFILE) out:crack7.bim stack:1k map:crack7.map crack7.obj
+
+crack7.hrb : crack7.bim Makefile
+	$(BIM2HRB) crack7.bim crack7.hrb 0k
+
 haribote.img : ipl10.bin haribote.sys Makefile \
 		hello.hrb hello2.hrb a.hrb hello3.hrb hello4.hrb hello5.hrb \
 		winhelo.hrb winhelo2.hrb winhelo3.hrb star1.hrb stars.hrb stars2.hrb \
-		lines.hrb walk.hrb noodle.hrb beepdown.hrb color.hrb color2.hrb
+		lines.hrb walk.hrb noodle.hrb beepdown.hrb color.hrb color2.hrb \
+		crack7.hrb
 	$(EDIMG)   imgin:../z_tools/fdimg0at.tek \
 		wbinimg src:ipl10.bin len:512 from:0 to:0 \
 		copy from:haribote.sys to:@: \
@@ -191,6 +198,7 @@ haribote.img : ipl10.bin haribote.sys Makefile \
 		copy from:beepdown.hrb to:@: \
 		copy from:color.hrb to:@: \
 		copy from:color2.hrb to:@: \
+		copy from:crack7.hrb to:@: \
 		imgout:haribote.img
 
 # 其他指令

27_day/bootpack.h

@@ -88,15 +88,16 @@ struct GATE_DESCRIPTOR {
 void init_gdtidt(void);
 void set_segmdesc(struct SEGMENT_DESCRIPTOR *sd, unsigned int limit, int base, int ar);
 void set_gatedesc(struct GATE_DESCRIPTOR *gd, int offset, int selector, int ar);
-#define ADR_IDT			0x0026f800
-#define LIMIT_IDT		0x000007ff
-#define ADR_GDT			0x00270000
-#define LIMIT_GDT		0x0000ffff
+#define ADR_IDT				0x0026f800
+#define LIMIT_IDT			0x000007ff
+#define ADR_GDT				0x00270000
+#define LIMIT_GDT			0x0000ffff
 #define ADR_BOTPAK		0x00280000
 #define LIMIT_BOTPAK	0x0007ffff
 #define AR_DATA32_RW	0x4092
 #define AR_CODE32_ER	0x409a
-#define AR_TSS32		0x0089
+#define AR_LDT				0x0082
+#define AR_TSS32			0x0089
 #define AR_INTGATE32	0x008e
 
 /* int.c */
@@ -210,6 +211,7 @@ struct TASK {
 	int level, priority; /* 优先级 */
 	struct FIFO32 fifo;
 	struct TSS32 tss;
+	struct SEGMENT_DESCRIPTOR ldt[2];
 	struct CONSOLE *cons;
 	int ds_base, cons_stack;
 };

27_day/console.c

@@ -373,12 +373,12 @@ int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline)
 			dathrb = *((int *) (p + 0x0014));
 			q = (char *) memman_alloc_4k(memman, segsiz);
 			task->ds_base = (int) q;
-			set_segmdesc(gdt + task->sel / 8 + 1000, finfo->size - 1, (int) p, AR_CODE32_ER + 0x60);
-			set_segmdesc(gdt + task->sel / 8 + 2000, segsiz - 1,      (int) q, AR_DATA32_RW + 0x60);
+			set_segmdesc(task->ldt + 0, finfo->size - 1, (int) p, AR_CODE32_ER + 0x60);
+			set_segmdesc(task->ldt + 1, segsiz - 1, (int) q, AR_DATA32_RW + 0x60); 
 			for (i = 0; i < datsiz; i++) {
 				q[esp + i] = p[dathrb + i];
 			}
-			start_app(0x1b, task->sel + 1000 * 8, esp, task->sel + 2000 * 8, &(task->tss.esp0));
+			start_app(0x1b, 0 * 8 + 4, esp, 1 * 8 + 4, &(task->tss.esp0));
 			shtctl = (struct SHTCTL *) *((int *) 0x0fe4);
 			for (i = 0; i < MAX_SHEETS; i++) {
 				sht = &(shtctl->sheets0[i]);

27_day/crack7.nas

@@ -0,0 +1,28 @@
+[FORMAT "WCOFF"]
+[INSTRSET "i486p"]
+[BITS 32]
+[FILE "crack7.nas"]
+
+		GLOBAL	_HariMain
+
+[SECTION .text]
+
+_HariMain:
+		MOV		AX,1005*8
+		MOV		DS,AX
+		CMP		DWORD [DS:0x0004],'Hari'
+		JNE		fin								; 不是应用程序，因此不执行任何操作
+
+		MOV		ECX,[DS:0x0000]		; 读取该应用程序数据段的大小
+		MOV		AX,2005*8
+		MOV		DS,AX
+
+crackloop:							; 整个用123填充
+		ADD		ECX,-1
+		MOV		BYTE [DS:ECX],123
+		CMP		ECX,0
+		JNE		crackloop
+
+fin:										; 结束
+		MOV		EDX,4
+		INT		0x40

27_day/mtask.c

@@ -82,7 +82,9 @@ struct TASK *task_init(struct MEMMAN *memman)
 	for (i = 0; i < MAX_TASKS; i++) {
 		taskctl->tasks0[i].flags = 0;
 		taskctl->tasks0[i].sel = (TASK_GDT0 + i) * 8;
+		taskctl->tasks0[i].tss.ldtr = (TASK_GDT0 + MAX_TASKS + i) * 8;
 		set_segmdesc(gdt + TASK_GDT0 + i, 103, (int) &taskctl->tasks0[i].tss, AR_TSS32);
+		set_segmdesc(gdt + TASK_GDT0 + MAX_TASKS + i, 15, (int) taskctl->tasks0[i].ldt, AR_LDT);
 	}
 	for (i = 0; i < MAX_TASKLEVELS; i++) {
 		taskctl->level[i].running = 0;
@@ -133,7 +135,6 @@ struct TASK *task_alloc(void)
 			task->tss.ds = 0;
 			task->tss.fs = 0;
 			task->tss.gs = 0;
-			task->tss.ldtr = 0;
 			task->tss.iomap = 0x40000000;
 			task->tss.ss0 = 0;
 			return task;