linux-kernel - [PATCH 4/4] iommufd/selftest: Reuse dma-buf revoke semantics

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260111-dmabuf-revoke-v1-4-fb4bcc8c259b@nvidia.com>
Date: Sun, 11 Jan 2026 12:37:11 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Alex Williamson <alex@...zbot.org>,
	Kevin Tian <kevin.tian@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	kvm@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: [PATCH 4/4] iommufd/selftest: Reuse dma-buf revoke semantics

From: Leon Romanovsky <leonro@...dia.com>

Test iommufd_test_dmabuf_revoke() with dma-buf revoke primitives.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/iommu/iommufd/selftest.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 550ff36dec3a..523dfac44ff8 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -1958,7 +1958,6 @@ void iommufd_selftest_destroy(struct iommufd_object *obj)
 struct iommufd_test_dma_buf {
 	void *memory;
 	size_t length;
-	bool revoked;
 };
 
 static int iommufd_test_dma_buf_attach(struct dma_buf *dmabuf,
@@ -2011,9 +2010,6 @@ int iommufd_test_dma_buf_iommufd_map(struct dma_buf_attachment *attachment,
 	if (attachment->dmabuf->ops != &iommufd_test_dmabuf_ops)
 		return -EOPNOTSUPP;
 
-	if (priv->revoked)
-		return -ENODEV;
-
 	phys->paddr = virt_to_phys(priv->memory);
 	phys->len = priv->length;
 	return 0;
@@ -2065,7 +2061,6 @@ static int iommufd_test_dmabuf_get(struct iommufd_ucmd *ucmd,
 static int iommufd_test_dmabuf_revoke(struct iommufd_ucmd *ucmd, int fd,
 				      bool revoked)
 {
-	struct iommufd_test_dma_buf *priv;
 	struct dma_buf *dmabuf;
 	int rc = 0;
 
@@ -2078,10 +2073,11 @@ static int iommufd_test_dmabuf_revoke(struct iommufd_ucmd *ucmd, int fd,
 		goto err_put;
 	}
 
-	priv = dmabuf->priv;
 	dma_resv_lock(dmabuf->resv, NULL);
-	priv->revoked = revoked;
-	dma_buf_move_notify(dmabuf);
+	if (revoked)
+		dma_buf_move_notify(dmabuf);
+	else
+		dma_buf_mark_valid(dmabuf);
 	dma_resv_unlock(dmabuf->resv);
 
 err_put:

-- 
2.52.0