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proc: Provide details on speculation flaw mitigations
commit fae1fa0fc6
upstream
As done with seccomp and no_new_privs, also show speculation flaw
mitigation state in /proc/$pid/status.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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1 changed files with 22 additions and 0 deletions
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@ -85,6 +85,7 @@
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#include <linux/delayacct.h>
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#include <linux/seq_file.h>
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#include <linux/pid_namespace.h>
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#include <linux/prctl.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/string_helpers.h>
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@ -347,6 +348,27 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
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#ifdef CONFIG_SECCOMP
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seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
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#endif
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seq_printf(m, "\nSpeculation Store Bypass:\t");
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switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
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case -EINVAL:
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seq_printf(m, "unknown");
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break;
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case PR_SPEC_NOT_AFFECTED:
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seq_printf(m, "not vulnerable");
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break;
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case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
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seq_printf(m, "thread mitigated");
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break;
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case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
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seq_printf(m, "thread vulnerable");
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break;
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case PR_SPEC_DISABLE:
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seq_printf(m, "globally mitigated");
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break;
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default:
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seq_printf(m, "vulnerable");
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break;
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}
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seq_putc(m, '\n');
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}
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