diff options
Diffstat (limited to 'arch/i386/mm')
| -rw-r--r-- | arch/i386/mm/fault.c | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index 8181fd6c7..beb9f91a4 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -74,6 +74,10 @@ bad_area: return 0; } +asmlinkage void do_invalid_op (struct pt_regs *, unsigned long); + +extern int pentium_f00f_bug; + /* * This routine handles page faults. It determines the address, * and the problem, and then passes it off to one of the appropriate @@ -86,18 +90,21 @@ bad_area: */ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code) { - struct task_struct *tsk = current; - struct mm_struct *mm = tsk->mm; + struct task_struct *tsk; + struct mm_struct *mm; struct vm_area_struct * vma; unsigned long address; unsigned long page; unsigned long fixup; int write; - lock_kernel(); - /* get the address */ __asm__("movl %%cr2,%0":"=r" (address)); + + lock_kernel(); + tsk = current; + mm = tsk->mm; + down(&mm->mmap_sem); vma = find_vma(mm, address); if (!vma) @@ -170,11 +177,27 @@ bad_area: goto out; } + /* + * Pentium F0 0F C7 C8 bug workaround. + */ + if (pentium_f00f_bug) { + unsigned long nr; + + nr = (address - (unsigned long) idt) >> 3; + + if (nr == 6) { + unlock_kernel(); + do_invalid_op(regs, 0); + return; + } + } + /* Are we prepared to handle this kernel fault? */ if ((fixup = search_exception_table(regs->eip)) != 0) { - printk(KERN_DEBUG "%s: Exception at [<%lx>] (%lx)\n", + printk(KERN_DEBUG "%s: Exception at [<%lx>] cr2=%lx (fixup: %lx)\n", tsk->comm, regs->eip, + address, fixup); regs->eip = fixup; goto out; @@ -192,6 +215,7 @@ bad_area: flush_tlb(); goto out; } + if (address < PAGE_SIZE) printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); else |