[PATCH 4.4 069/107] proc: Provide details on speculation flaw mitigations
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2018-07-23 12:48:37
Also in:
lkml
4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kees Cook <redacted> 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 <redacted> Signed-off-by: Thomas Gleixner <redacted> Signed-off-by: David Woodhouse <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Srivatsa S. Bhat <redacted> Reviewed-by: Matt Helsley (VMware) <redacted> Reviewed-by: Alexey Makhalov <redacted> Reviewed-by: Bo Gan <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/proc/array.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c@@ -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 s #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,