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authorKees Cook <keescook@chromium.org>2018-05-01 15:31:45 -0700
committerThomas Gleixner <tglx@linutronix.de>2018-05-03 13:55:51 +0200
commitfae1fa0fc6cca8beee3ab8ed71d54f9a78fa3f64 (patch)
tree29f33c733c1cbc50f98bc3ecdcd7d89bfbaa8d1f
parent7bbf1373e228840bb0295a2ca26d548ef37f448e (diff)
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: Kees Cook <keescook@chromium.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--fs/proc/array.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c
index ae2c807fd719..303c155f9b04 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -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');
}