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62 lines
1.4 KiB
62 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/spinlock.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/pgtable.h> |
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#include <asm/proto.h> |
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#include <asm/cpufeature.h> |
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static int disable_nx; |
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/* |
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* noexec = on|off |
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* |
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* Control non-executable mappings for processes. |
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* |
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* on Enable |
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* off Disable |
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*/ |
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static int __init noexec_setup(char *str) |
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{ |
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if (!str) |
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return -EINVAL; |
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if (!strncmp(str, "on", 2)) { |
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disable_nx = 0; |
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} else if (!strncmp(str, "off", 3)) { |
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disable_nx = 1; |
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} |
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x86_configure_nx(); |
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return 0; |
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} |
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early_param("noexec", noexec_setup); |
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void x86_configure_nx(void) |
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{ |
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if (boot_cpu_has(X86_FEATURE_NX) && !disable_nx) |
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__supported_pte_mask |= _PAGE_NX; |
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else |
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__supported_pte_mask &= ~_PAGE_NX; |
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} |
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void __init x86_report_nx(void) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_NX)) { |
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printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " |
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"missing in CPU!\n"); |
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} else { |
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) |
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if (disable_nx) { |
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printk(KERN_INFO "NX (Execute Disable) protection: " |
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"disabled by kernel command line option\n"); |
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} else { |
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printk(KERN_INFO "NX (Execute Disable) protection: " |
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"active\n"); |
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} |
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#else |
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/* 32bit non-PAE kernel, NX cannot be used */ |
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printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " |
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"cannot be enabled: non-PAE kernel!\n"); |
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#endif |
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} |
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}
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