diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index b8c4e259fc8b7929e5ebeb1ea028c9d25a033646..c6a0a06258e61e3f448723dcf4c2912cbdc6e766 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -20,6 +20,7 @@ #include #include /* For unblank_screen() */ #include +#include /* for max_low_pfn */ #include #include #include @@ -301,7 +302,6 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, struct mm_struct *mm; struct vm_area_struct * vma; unsigned long address; - unsigned long page; int write, si_code; /* get the address */ @@ -510,7 +510,9 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, bust_spinlocks(1); if (oops_may_print()) { - #ifdef CONFIG_X86_PAE + __typeof__(pte_val(__pte(0))) page; + +#ifdef CONFIG_X86_PAE if (error_code & 16) { pte_t *pte = lookup_address(address); @@ -519,7 +521,7 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, "NX-protected page - exploit attempt? " "(uid: %d)\n", current->uid); } - #endif +#endif if (address < PAGE_SIZE) printk(KERN_ALERT "BUG: unable to handle kernel NULL " "pointer dereference"); @@ -529,25 +531,38 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, printk(" at virtual address %08lx\n",address); printk(KERN_ALERT " printing eip:\n"); printk("%08lx\n", regs->eip); - } - page = read_cr3(); - page = ((unsigned long *) __va(page))[address >> 22]; - if (oops_may_print()) + + page = read_cr3(); + page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT]; +#ifdef CONFIG_X86_PAE + printk(KERN_ALERT "*pdpt = %016Lx\n", page); + if ((page >> PAGE_SHIFT) < max_low_pfn + && page & _PAGE_PRESENT) { + page &= PAGE_MASK; + page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT) + & (PTRS_PER_PMD - 1)]; + printk(KERN_ALERT "*pde = %016Lx\n", page); + page &= ~_PAGE_NX; + } +#else printk(KERN_ALERT "*pde = %08lx\n", page); - /* - * We must not directly access the pte in the highpte - * case, the page table might be allocated in highmem. - * And lets rather not kmap-atomic the pte, just in case - * it's allocated already. - */ -#ifndef CONFIG_HIGHPTE - if ((page & 1) && oops_may_print()) { - page &= PAGE_MASK; - address &= 0x003ff000; - page = ((unsigned long *) __va(page))[address >> PAGE_SHIFT]; - printk(KERN_ALERT "*pte = %08lx\n", page); - } #endif + + /* + * We must not directly access the pte in the highpte + * case if the page table is located in highmem. + * And let's rather not kmap-atomic the pte, just in case + * it's allocated already. + */ + if ((page >> PAGE_SHIFT) < max_low_pfn + && (page & _PAGE_PRESENT)) { + page &= PAGE_MASK; + page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT) + & (PTRS_PER_PTE - 1)]; + printk(KERN_ALERT "*pte = %0*Lx\n", sizeof(page)*2, (u64)page); + } + } + tsk->thread.cr2 = address; tsk->thread.trap_no = 14; tsk->thread.error_code = error_code;