diff options
Diffstat (limited to 'arch/parisc/mm/fault.c')
| -rw-r--r-- | arch/parisc/mm/fault.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 8ff9253930af..32ec22146141 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -13,6 +13,7 @@ #include <linux/mm.h> #include <linux/ptrace.h> #include <linux/sched.h> +#include <linux/sched/debug.h> #include <linux/interrupt.h> #include <linux/extable.h> #include <linux/uaccess.h> @@ -149,6 +150,23 @@ int fixup_exception(struct pt_regs *regs) d->fault_space = regs->isr; d->fault_addr = regs->ior; + /* + * Fix up get_user() and put_user(). + * ASM_EXCEPTIONTABLE_ENTRY_EFAULT() sets the least-significant + * bit in the relative address of the fixup routine to indicate + * that %r8 should be loaded with -EFAULT to report a userspace + * access error. + */ + if (fix->fixup & 1) { + regs->gr[8] = -EFAULT; + + /* zero target register for get_user() */ + if (parisc_acctyp(0, regs->iir) == VM_READ) { + int treg = regs->iir & 0x1f; + regs->gr[treg] = 0; + } + } + regs->iaoq[0] = (unsigned long)&fix->fixup + fix->fixup; regs->iaoq[0] &= ~3; /* @@ -234,12 +252,12 @@ show_signal_msg(struct pt_regs *regs, unsigned long code, tsk->comm, code, address); print_vma_addr(KERN_CONT " in ", regs->iaoq[0]); - pr_cont(" trap #%lu: %s%c", code, trap_name(code), + pr_cont("\ntrap #%lu: %s%c", code, trap_name(code), vma ? ',':'\n'); if (vma) - pr_warn(KERN_CONT " vm_start = 0x%08lx, vm_end = 0x%08lx\n", - vma->vm_start, vma->vm_end); + pr_cont(" vm_start = 0x%08lx, vm_end = 0x%08lx\n", + vma->vm_start, vma->vm_end); show_regs(regs); } |