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SubjectRe: [RFC PATCH v2 17/27] x86/cet/shstk: User-mode shadow stack support
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On 07/10/2018 03:26 PM, Yu-cheng Yu wrote:
> +static __init int setup_disable_shstk(char *s)
> +{
> + /* require an exact match without trailing characters */
> + if (strlen(s))
> + return 0;
> +
> + if (!boot_cpu_has(X86_FEATURE_SHSTK))
> + return 1;
> +
> + setup_clear_cpu_cap(X86_FEATURE_SHSTK);
> + pr_info("x86: 'no_cet_shstk' specified, disabling Shadow Stack\n");
> + return 1;
> +}
> +__setup("no_cet_shstk", setup_disable_shstk);

Why do we need a boot-time disable for this?

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