https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 authored by Linus Torvalds on 14 May 2023, 19:51:40 UTC
Linux 6.4-rc2
Linux 6.4-rc2
Tip revision: f1fcbaa
spectre.c
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bpf.h>
#include <linux/cpu.h>
#include <linux/device.h>
#include <asm/spectre.h>
static bool _unprivileged_ebpf_enabled(void)
{
#ifdef CONFIG_BPF_SYSCALL
return !sysctl_unprivileged_bpf_disabled;
#else
return false;
#endif
}
ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "Mitigation: __user pointer sanitization\n");
}
static unsigned int spectre_v2_state;
static unsigned int spectre_v2_methods;
void spectre_v2_update_state(unsigned int state, unsigned int method)
{
if (state > spectre_v2_state)
spectre_v2_state = state;
spectre_v2_methods |= method;
}
ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr,
char *buf)
{
const char *method;
if (spectre_v2_state == SPECTRE_UNAFFECTED)
return sprintf(buf, "%s\n", "Not affected");
if (spectre_v2_state != SPECTRE_MITIGATED)
return sprintf(buf, "%s\n", "Vulnerable");
if (_unprivileged_ebpf_enabled())
return sprintf(buf, "Vulnerable: Unprivileged eBPF enabled\n");
switch (spectre_v2_methods) {
case SPECTRE_V2_METHOD_BPIALL:
method = "Branch predictor hardening";
break;
case SPECTRE_V2_METHOD_ICIALLU:
method = "I-cache invalidation";
break;
case SPECTRE_V2_METHOD_SMC:
case SPECTRE_V2_METHOD_HVC:
method = "Firmware call";
break;
case SPECTRE_V2_METHOD_LOOP8:
method = "History overwrite";
break;
default:
method = "Multiple mitigations";
break;
}
return sprintf(buf, "Mitigation: %s\n", method);
}