diff options
Diffstat (limited to 'arch/x86/mm/init_64.c')
| -rw-r--r-- | arch/x86/mm/init_64.c | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 5a4398a6006..5198b9bb34e 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -568,7 +568,8 @@ kernel_physical_mapping_init(unsigned long start, } #ifndef CONFIG_NUMA -void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) +void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn, + int acpi, int k8) { unsigned long bootmap_size, bootmap; @@ -694,12 +695,12 @@ void __init mem_init(void) const int rodata_test_data = 0xC3; EXPORT_SYMBOL_GPL(rodata_test_data); -static int kernel_set_to_readonly; +int kernel_set_to_readonly; void set_kernel_text_rw(void) { - unsigned long start = PFN_ALIGN(_stext); - unsigned long end = PFN_ALIGN(__start_rodata); + unsigned long start = PFN_ALIGN(_text); + unsigned long end = PFN_ALIGN(__stop___ex_table); if (!kernel_set_to_readonly) return; @@ -707,13 +708,18 @@ void set_kernel_text_rw(void) pr_debug("Set kernel text: %lx - %lx for read write\n", start, end); + /* + * Make the kernel identity mapping for text RW. Kernel text + * mapping will always be RO. Refer to the comment in + * static_protections() in pageattr.c + */ set_memory_rw(start, (end - start) >> PAGE_SHIFT); } void set_kernel_text_ro(void) { - unsigned long start = PFN_ALIGN(_stext); - unsigned long end = PFN_ALIGN(__start_rodata); + unsigned long start = PFN_ALIGN(_text); + unsigned long end = PFN_ALIGN(__stop___ex_table); if (!kernel_set_to_readonly) return; @@ -721,14 +727,21 @@ void set_kernel_text_ro(void) pr_debug("Set kernel text: %lx - %lx for read only\n", start, end); + /* + * Set the kernel identity mapping for text RO. + */ set_memory_ro(start, (end - start) >> PAGE_SHIFT); } void mark_rodata_ro(void) { - unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); + unsigned long start = PFN_ALIGN(_text); unsigned long rodata_start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; + unsigned long end = (unsigned long) &__end_rodata_hpage_align; + unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table); + unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata); + unsigned long data_start = (unsigned long) &_sdata; printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", (end - start) >> 10); @@ -751,6 +764,14 @@ void mark_rodata_ro(void) printk(KERN_INFO "Testing CPA: again\n"); set_memory_ro(start, (end-start) >> PAGE_SHIFT); #endif + + free_init_pages("unused kernel memory", + (unsigned long) page_address(virt_to_page(text_end)), + (unsigned long) + page_address(virt_to_page(rodata_start))); + free_init_pages("unused kernel memory", + (unsigned long) page_address(virt_to_page(rodata_end)), + (unsigned long) page_address(virt_to_page(data_start))); } #endif |