diff options
Diffstat (limited to 'arch/x86/mm/fault_32.c')
| -rw-r--r-- | arch/x86/mm/fault_32.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c index 75ae8c498d67..0bd241729aa3 100644 --- a/arch/x86/mm/fault_32.c +++ b/arch/x86/mm/fault_32.c @@ -286,6 +286,22 @@ static int is_errata93(struct pt_regs *regs, unsigned long address) return 0; } +/* + * Work around K8 erratum #100 K8 in compat mode occasionally jumps to illegal + * addresses >4GB. We catch this in the page fault handler because these + * addresses are not reachable. Just detect this case and return. Any code + * segment in LDT is compatibility mode. + */ +static int is_errata100(struct pt_regs *regs, unsigned long address) +{ +#ifdef CONFIG_X86_64 + if ((regs->cs == __USER32_CS || (regs->cs & (1<<2))) && + (address >> 32)) + return 1; +#endif + return 0; +} + void do_invalid_op(struct pt_regs *, unsigned long); static int is_f00f_bug(struct pt_regs *regs, unsigned long address) @@ -566,6 +582,9 @@ bad_area_nosemaphore: if (is_prefetch(regs, address, error_code)) return; + if (is_errata100(regs, address)) + return; + if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && printk_ratelimit()) { printk( |
