From b8e2b780e32764225c41970817da238ce8e681e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Josef=20S=C3=B6ntgen?= <josef.soentgen@genode-labs.com>
Date: Tue, 26 Apr 2022 14:58:09 +0200
Subject: [PATCH] nvme_drv: reject requests with unaligned offset

Since the driver relies on all requests being Nvme::MPS_LOG2 aligned
as advertised in its Block::Info the added check will reject any
misaligned requests (using 'gpt_write' led to an IOMMU write fault).

Issue #4486.
---
 repos/os/src/drivers/nvme/main.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/repos/os/src/drivers/nvme/main.cc b/repos/os/src/drivers/nvme/main.cc
index 561e81678e..76050cc626 100644
--- a/repos/os/src/drivers/nvme/main.cc
+++ b/repos/os/src/drivers/nvme/main.cc
@@ -1649,6 +1649,9 @@ class Nvme::Driver : Genode::Noncopyable
 				return Response::RETRY;
 			}
 
+			if (!Genode::aligned(request.offset, Nvme::MPS_LOG2))
+				return Response::REJECTED;
+
 			switch (request.operation.type) {
 			case Block::Operation::Type::INVALID:
 				return Response::REJECTED;