From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 4 May 2018 09:40:03 +0200
Subject: seccomp: Use PR_SPEC_FORCE_DISABLE
Patch-mainline: v4.17-rc7
Git-commit: b849a812f7eb92e96d1c8239b06581b2cfd8b275
References: bsc#1087082 CVE-2018-3639

Use PR_SPEC_FORCE_DISABLE in seccomp() because seccomp does not allow to
widen restrictions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@suse.de>
---
 kernel/seccomp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -227,7 +227,7 @@ static inline void spec_mitigate(struct
 	int state = arch_prctl_spec_ctrl_get(task, which);
 
 	if (state > 0 && (state & PR_SPEC_PRCTL))
-		arch_prctl_spec_ctrl_set(task, which, PR_SPEC_DISABLE);
+		arch_prctl_spec_ctrl_set(task, which, PR_SPEC_FORCE_DISABLE);
 }
 
 static inline void seccomp_assign_mode(struct task_struct *task,