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proc: Provide details on speculation flaw mitigations

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commit fae1fa0fc6cca8beee3ab8ed71d54f9a78fa3f64 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: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com>
Reviewed-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Bo Gan <ganb@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2018-07-14 02:36:25 -07:00 • committed by Greg Kroah-Hartman
parent b6f4a6285d
commit 484964fa3e
1 changed files with 23 additions and 0 deletions
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23
fs/proc/array.c
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@ -79,6 +79,7 @@
#include <linux/delayacct.h>
#include <linux/seq_file.h>
#include <linux/pid_namespace.h>
#include <linux/prctl.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/string_helpers.h>
@ -332,6 +333,28 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
#ifdef CONFIG_SECCOMP
seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
#endif
seq_printf(m, "\nSpeculation Store Bypass:\t");
switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
case -EINVAL:
seq_printf(m, "unknown");
break;
case PR_SPEC_NOT_AFFECTED:
seq_printf(m, "not vulnerable");
break;
case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
seq_printf(m, "thread mitigated");
break;
case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
seq_printf(m, "thread vulnerable");
break;
case PR_SPEC_DISABLE:
seq_printf(m, "globally mitigated");
break;
default:
seq_printf(m, "vulnerable");
break;
}
seq_putc(m, '\n');
}
static inline void task_context_switch_counts(struct seq_file *m,