89 строки
2.0 KiB
C
89 строки
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Security related flags and so on.
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//
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// Copyright 2018, Michael Ellerman, IBM Corporation.
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/seq_buf.h>
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#include <asm/security_features.h>
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unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;
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ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
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{
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bool thread_priv;
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thread_priv = security_ftr_enabled(SEC_FTR_L1D_THREAD_PRIV);
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if (rfi_flush || thread_priv) {
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struct seq_buf s;
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seq_buf_init(&s, buf, PAGE_SIZE - 1);
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seq_buf_printf(&s, "Mitigation: ");
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if (rfi_flush)
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seq_buf_printf(&s, "RFI Flush");
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if (rfi_flush && thread_priv)
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seq_buf_printf(&s, ", ");
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if (thread_priv)
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seq_buf_printf(&s, "L1D private per thread");
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seq_buf_printf(&s, "\n");
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return s.len;
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}
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if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
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!security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))
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return sprintf(buf, "Not affected\n");
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return sprintf(buf, "Vulnerable\n");
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}
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ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)
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{
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if (!security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR))
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return sprintf(buf, "Not affected\n");
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return sprintf(buf, "Vulnerable\n");
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}
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ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, char *buf)
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{
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bool bcs, ccd, ori;
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struct seq_buf s;
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seq_buf_init(&s, buf, PAGE_SIZE - 1);
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bcs = security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED);
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ccd = security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED);
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ori = security_ftr_enabled(SEC_FTR_SPEC_BAR_ORI31);
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if (bcs || ccd) {
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seq_buf_printf(&s, "Mitigation: ");
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if (bcs)
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seq_buf_printf(&s, "Indirect branch serialisation (kernel only)");
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if (bcs && ccd)
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seq_buf_printf(&s, ", ");
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if (ccd)
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seq_buf_printf(&s, "Indirect branch cache disabled");
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} else
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seq_buf_printf(&s, "Vulnerable");
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if (ori)
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seq_buf_printf(&s, ", ori31 speculation barrier enabled");
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seq_buf_printf(&s, "\n");
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return s.len;
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}
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