Messages in this thread Patch in this message |  | | Date | Mon, 16 Dec 2019 14:53:47 -0800 | Subject | [PATCH] Return ENODEV when the selected speculation misfeature is unsupported | From | Anthony Steinhauser <> |
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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 <asteinhauser@google.com> --- 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: -- 2.24.1.735.g03f4e72817-goog
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