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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:40:19 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:40:19 +0000 |
commit | 9f0fc191371843c4fc000a226b0a26b6c059aacd (patch) | |
tree | 35f8be3ef04506ac891ad001e8c41e535ae8d01d /arch/x86/mm/pti.c | |
parent | Releasing progress-linux version 6.6.15-2~progress7.99u1. (diff) | |
download | linux-9f0fc191371843c4fc000a226b0a26b6c059aacd.tar.xz linux-9f0fc191371843c4fc000a226b0a26b6c059aacd.zip |
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/mm/pti.c')
-rw-r--r-- | arch/x86/mm/pti.c | 58 |
1 files changed, 29 insertions, 29 deletions
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c index 78414c6d1b..5dd7339446 100644 --- a/arch/x86/mm/pti.c +++ b/arch/x86/mm/pti.c @@ -69,6 +69,7 @@ static void __init pti_print_if_secure(const char *reason) pr_info("%s\n", reason); } +/* Assume mode is auto unless overridden via cmdline below. */ static enum pti_mode { PTI_AUTO = 0, PTI_FORCE_OFF, @@ -77,50 +78,49 @@ static enum pti_mode { void __init pti_check_boottime_disable(void) { - char arg[5]; - int ret; - - /* Assume mode is auto unless overridden. */ - pti_mode = PTI_AUTO; - if (hypervisor_is_type(X86_HYPER_XEN_PV)) { pti_mode = PTI_FORCE_OFF; pti_print_if_insecure("disabled on XEN PV."); return; } - ret = cmdline_find_option(boot_command_line, "pti", arg, sizeof(arg)); - if (ret > 0) { - if (ret == 3 && !strncmp(arg, "off", 3)) { - pti_mode = PTI_FORCE_OFF; - pti_print_if_insecure("disabled on command line."); - return; - } - if (ret == 2 && !strncmp(arg, "on", 2)) { - pti_mode = PTI_FORCE_ON; - pti_print_if_secure("force enabled on command line."); - goto enable; - } - if (ret == 4 && !strncmp(arg, "auto", 4)) { - pti_mode = PTI_AUTO; - goto autosel; - } - } - - if (cmdline_find_option_bool(boot_command_line, "nopti") || - cpu_mitigations_off()) { + if (cpu_mitigations_off()) pti_mode = PTI_FORCE_OFF; + if (pti_mode == PTI_FORCE_OFF) { pti_print_if_insecure("disabled on command line."); return; } -autosel: - if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) + if (pti_mode == PTI_FORCE_ON) + pti_print_if_secure("force enabled on command line."); + + if (pti_mode == PTI_AUTO && !boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) return; -enable: + setup_force_cpu_cap(X86_FEATURE_PTI); } +static int __init pti_parse_cmdline(char *arg) +{ + if (!strcmp(arg, "off")) + pti_mode = PTI_FORCE_OFF; + else if (!strcmp(arg, "on")) + pti_mode = PTI_FORCE_ON; + else if (!strcmp(arg, "auto")) + pti_mode = PTI_AUTO; + else + return -EINVAL; + return 0; +} +early_param("pti", pti_parse_cmdline); + +static int __init pti_parse_cmdline_nopti(char *arg) +{ + pti_mode = PTI_FORCE_OFF; + return 0; +} +early_param("nopti", pti_parse_cmdline_nopti); + pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd) { /* |