From b3c75c9d762b67de278c8847529b1e3a4c143a8e Mon Sep 17 00:00:00 2001 From: Anthony Steinhauser Date: Mon, 16 Dec 2019 14:53:47 -0800 Subject: [PATCH] Return ENODEV when the selected speculation misfeature is unsupported When the control of the selected speculation misbehavior is unsupported, the kernel should return ENODEV according to the documentation: https://www.kernel.org/doc/html/v4.17/userspace-api/spec_ctrl.html Current aarch64 implementation of SSB control sometimes returns EINVAL which is reserved for unimplemented prctl and for violations of reserved arguments. This change makes the aarch64 implementation consistent with the x86 implementation and with the documentation. Signed-off-by: Anthony Steinhauser Signed-off-by: Will Deacon --- arch/arm64/kernel/ssbd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/ssbd.c b/arch/arm64/kernel/ssbd.c index 52cfc6148355..b26955f56750 100644 --- a/arch/arm64/kernel/ssbd.c +++ b/arch/arm64/kernel/ssbd.c @@ -37,7 +37,7 @@ static int ssbd_prctl_set(struct task_struct *task, unsigned long ctrl) /* Unsupported */ if (state == ARM64_SSBD_UNKNOWN) - return -EINVAL; + return -ENODEV; /* Treat the unaffected/mitigated state separately */ if (state == ARM64_SSBD_MITIGATED) { @@ -102,7 +102,7 @@ static int ssbd_prctl_get(struct task_struct *task) { switch (arm64_get_ssbd_state()) { case ARM64_SSBD_UNKNOWN: - return -EINVAL; + return -ENODEV; case ARM64_SSBD_FORCE_ENABLE: return PR_SPEC_DISABLE; case ARM64_SSBD_KERNEL: -- 2.30.2