diff options
Diffstat (limited to 'arch/x86/mm/fault_64.c')
| -rw-r--r-- | arch/x86/mm/fault_64.c | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c index d519b41f196..80f8436ac8b 100644 --- a/arch/x86/mm/fault_64.c +++ b/arch/x86/mm/fault_64.c @@ -84,7 +84,6 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr, unsigned char *max_instr; #ifdef CONFIG_X86_32 - unsigned long limit; if (unlikely(boot_cpu_data.x86_vendor == X86_VENDOR_AMD && boot_cpu_data.x86 >= 6)) { /* Catch an obscure case of prefetch inside an NX page. */ @@ -93,30 +92,23 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr, } else { return 0; } - instr = (unsigned char *)get_segment_eip(regs, &limit); #else /* If it was a exec fault ignore */ if (error_code & PF_INSTR) return 0; - instr = (unsigned char __user *)convert_ip_to_linear(current, regs); #endif + instr = (unsigned char *)convert_ip_to_linear(current, regs); max_instr = instr + 15; -#ifdef CONFIG_X86_64 if (user_mode(regs) && instr >= (unsigned char *)TASK_SIZE) return 0; -#endif while (scan_more && instr < max_instr) { unsigned char opcode; unsigned char instr_hi; unsigned char instr_lo; -#ifdef CONFIG_X86_32 - if (instr > (unsigned char *)limit) - break; -#endif if (probe_kernel_address(instr, opcode)) break; @@ -158,10 +150,7 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr, case 0x00: /* Prefetch instruction is 0x0F0D or 0x0F18 */ scan_more = 0; -#ifdef CONFIG_X86_32 - if (instr > (unsigned char *)limit) - break; -#endif + if (probe_kernel_address(instr, opcode)) break; prefetch = (instr_lo == 0xF) && |