On Wed, Apr 04, 2018 at 06:11:06AM +0000, Michal Meloun wrote:
> New Revision: 331988
> URL: https://svnweb.freebsd.org/changeset/base/331988
>
> Log:
> MFC r328467:
>
> Implement mitigation for Spectre version 2 attacks on ARMv7.
>
> + case CPU_ARCH_CORTEX_A8:
> + /*
> + * For Cortex-A8, IBE bit must be set otherwise
> + * BPIALL is effectively NOP.
> + * Unfortunately, Cortex-A is also affected by
> + * ARM erratum 687067 which causes non-working
> + * BPIALL if IBE bit is set and 'Instruction L1 System
> + * Array Debug Register 0' is not 0.
> + * This register is not reset on power-up and is
> + * accessible only from secure world, so we cannot do
> + * nothing (nor detect) to fix this issue.
> + * I afraid that on chip ROM based secure monitor on
"I'm afraid", perhaps?
> + printf("!!!WARNING!!! CPU(%d) is vulnerable to speculative "
> + "branch attacks. !!!\n"
> + "Qualcomm Krait cores are known (or believed) to be "
> + "vulnerable to \n"
> + "speculative branch attacks, no mitigation exists yet.\n",
> + PCPU_GET(cpuid));
> + goto unkonown_mitigation;
> + } else {
> + goto unkonown_mitigation;
unkonown? :-)
./danfe
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