Commit fae1fa0f authored by Kees Cook's avatar Kees Cook Committed by Thomas Gleixner
Browse files

proc: Provide details on speculation flaw mitigations 



As done with seccomp and no_new_privs, also show speculation flaw
mitigation state in /proc/$pid/status.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 7bbf1373

fs/proc/array.c

+22 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ 
#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>
@@ -335,6 +336,27 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 
#ifdef CONFIG_SECCOMP

	seq_put_decimal_ull(m, "\nSeccomp:\t", 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');

}