[tip: irq/urgent] irqchip/gic-v3: Work around insecure GIC integrations

["tip-bot2 for Marc Zyngier" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     773c05f417fa14e1ac94776619e9c978ec001f0b
Gitweb:        https://git.kernel.org/tip/773c05f417fa14e1ac94776619e9c978ec001f0b
Author:        Marc Zyngier <maz@kernel.org>
AuthorDate:    Fri, 13 Dec 2024 14:10:37 
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Fri, 13 Dec 2024 18:15:29 +01:00

irqchip/gic-v3: Work around insecure GIC integrations

It appears that the relatively popular RK3399 SoC has been put together
using a large amount of illicit substances, as experiments reveal that its
integration of GIC500 exposes the *secure* programming interface to
non-secure.

This has some pretty bad effects on the way priorities are handled, and
results in a dead machine if booting with pseudo-NMI enabled
(irqchip.gicv3_pseudo_nmi=1) if the kernel contains 18fdb6348c480 ("arm64:
irqchip/gic-v3: Select priorities at boot time"), which relies on the
priorities being programmed using the NS view.

Let's restore some sanity by going one step further and disable security
altogether in this case. This is not any worse, and puts us in a mode where
priorities actually make some sense.

Huge thanks to Mark Kettenis who initially identified this issue on
OpenBSD, and to Chen-Yu Tsai who reported the problem in Linux.

Fixes: 18fdb6348c480 ("arm64: irqchip/gic-v3: Select priorities at boot time")
Reported-by: Mark Kettenis <mark.kettenis@xs4all.nl>
Reported-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Chen-Yu Tsai <wens@csie.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20241213141037.3995049-1-maz@kernel.org

---
 drivers/irqchip/irq-gic-v3.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 34db379..79d8cc8 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -161,7 +161,22 @@ static bool cpus_have_group0 __ro_after_init;
 
 static void __init gic_prio_init(void)
 {
-	cpus_have_security_disabled = gic_dist_security_disabled();
+	bool ds;
+
+	ds = gic_dist_security_disabled();
+	if (!ds) {
+		u32 val;
+
+		val = readl_relaxed(gic_data.dist_base + GICD_CTLR);
+		val |= GICD_CTLR_DS;
+		writel_relaxed(val, gic_data.dist_base + GICD_CTLR);
+
+		ds = gic_dist_security_disabled();
+		if (ds)
+			pr_warn("Broken GIC integration, security disabled");
+	}
+
+	cpus_have_security_disabled = ds;
 	cpus_have_group0 = gic_has_group0();
 
 	/*