diff options
Diffstat (limited to 'arch/arc/mm/fault.c')
| -rw-r--r-- | arch/arc/mm/fault.c | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index a3a292c58e50..8c7c81ce7f6a 100644 --- a/arch/arc/mm/fault.c +++ b/arch/arc/mm/fault.c @@ -64,9 +64,9 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) struct task_struct *tsk = current; struct mm_struct *mm = tsk->mm; int si_code = SEGV_MAPERR; + unsigned int write = 0, exec = 0, mask; vm_fault_t fault; - int write = regs->ecr_cause & ECR_C_PROTV_STORE; /* ST/EX */ - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags; /* * NOTE! We MUST NOT take any locks for this case. We may @@ -88,8 +88,18 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) if (faulthandler_disabled() || !mm) goto no_context; + if (regs->ecr_cause & ECR_C_PROTV_STORE) /* ST/EX */ + write = 1; + else if ((regs->ecr_vec == ECR_V_PROTV) && + (regs->ecr_cause == ECR_C_PROTV_INST_FETCH)) + exec = 1; + + flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; if (user_mode(regs)) flags |= FAULT_FLAG_USER; + if (write) + flags |= FAULT_FLAG_WRITE; + retry: down_read(&mm->mmap_sem); @@ -102,24 +112,17 @@ retry: } /* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. + * vm_area is good, now check permissions for this memory access */ - si_code = SEGV_ACCERR; - - /* Handle protection violation, execute on heap or stack */ - - if ((regs->ecr_vec == ECR_V_PROTV) && - (regs->ecr_cause == ECR_C_PROTV_INST_FETCH)) + mask = VM_READ; + if (write) + mask = VM_WRITE; + if (exec) + mask = VM_EXEC; + + if (!(vma->vm_flags & mask)) { + si_code = SEGV_ACCERR; goto bad_area; - - if (write) { - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - flags |= FAULT_FLAG_WRITE; - } else { - if (!(vma->vm_flags & (VM_READ | VM_EXEC))) - goto bad_area; } /* |