Question

我使用的是android-kernel 2.6.29。我试图在android-kernel上挂钩开放系统调用。我按照链接http://syprog.blogspot.com.au/2011/10/hijack-linux-system-calls-part-iii.html挂钩ubuntu 12.04LTS并成功但是当我交叉编译我的模块的android然后我得到以下错误

错误：隐式lookup_address函数

任何人都可以帮忙吗？为什么我收到此错误？有什么替代的lookup_address？

Answer 1

根据Linux Cross-reference判断ARM架构的适当标准，参考第一个引用的内核版本2.6.32（没有2.6.29 不幸）

尽管设定了标准，但交叉引用将产生主要指x86架构的命中。引用：

lookup_address

Defined as a function in:
arch/x86/mm/pageattr.c, line 295
arch/sh/kernel/io_trapped.c, line 162
Defined as a function prototype in:
arch/x86/include/asm/pgtable_types.h, line 330
Referenced (in 11 files total) in:
arch/x86/include/asm/pgtable_types.h, line 330
arch/x86/mm/kmemcheck/pte.c, line 12
arch/x86/mm/kmemcheck/kmemcheck.c:
line 269
line 295
arch/x86/mm/pageattr-test.c:
line 60
line 150
line 183
line 203
line 215
arch/x86/mm/mmio-mod.c, line 96
arch/x86/mm/fault.c, line 577
arch/x86/mm/kmmio.c, line 136
arch/x86/mm/pageattr.c:
line 200
line 238
line 295
line 326
line 371
line 487
line 606
line 1288
arch/x86/xen/mmu.c:
line 335
line 347
line 362
arch/x86/xen/enlighten.c:
line 281
line 364
arch/sh/kernel/io_trapped.c:
line 162
line 228
line 251

查看x86/mm/pageattr.c here中的实际源函数，只是为了显示函数的外观：

295 pte_t *lookup_address(unsigned long address, unsigned int *level)
296 {
297         pgd_t *pgd = pgd_offset_k(address);
298         pud_t *pud;
299         pmd_t *pmd;
300 
301         *level = PG_LEVEL_NONE;
302 
303         if (pgd_none(*pgd))
304                 return NULL;
305 
306         pud = pud_offset(pgd, address);
307         if (pud_none(*pud))
308                 return NULL;
309 
310         *level = PG_LEVEL_1G;
311         if (pud_large(*pud) || !pud_present(*pud))
312                 return (pte_t *)pud;
313 
314         pmd = pmd_offset(pud, address);
315         if (pmd_none(*pmd))
316                 return NULL;
317 
318         *level = PG_LEVEL_2M;
319         if (pmd_large(*pmd) || !pmd_present(*pmd))
320                 return (pte_t *)pmd;
321 
322         *level = PG_LEVEL_4K;
323 
324         return pte_offset_kernel(pmd, address);
325 }
326 EXPORT_SYMBOL_GPL(lookup_address);

android系统调用挂钩

1 个答案: