linux-kernel - [PATCH v2 17/17] arm64: ssbd: Implement arch_seccomp_spec

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Date:   Tue, 29 May 2018 13:11:21 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoffer Dall <christoffer.dall@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Julien Grall <julien.grall@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 17/17] arm64: ssbd: Implement arch_seccomp_spec_mitigate

Now that we have a way to safely implement TIF_SSBD for tasks
that are not in the kernel at the point were the flag gets
set, let's implement arch_seccomp_spec_mitigate().

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 arch/arm64/kernel/ssbd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/kernel/ssbd.c b/arch/arm64/kernel/ssbd.c
index 34eafdc7fb6b..a61da5e1b2ed 100644
--- a/arch/arm64/kernel/ssbd.c
+++ b/arch/arm64/kernel/ssbd.c
@@ -77,6 +77,13 @@ int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which,
 	}
 }
 
+#ifdef CONFIG_SECCOMP
+void arch_seccomp_spec_mitigate(struct task_struct *task)
+{
+	ssbd_prctl_set(task, PR_SPEC_FORCE_DISABLE);
+}
+#endif
+
 static int ssbd_prctl_get(struct task_struct *task)
 {
 	switch (arm64_get_ssbd_state()) {
-- 
2.14.2