linux-kernel - [RESEND RFC PATCH v2 07/14] drm/amdkfd: Switch from devcgroup_check

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Date:   Wed, 25 Oct 2023 11:42:17 +0200
From:   Michael Weiß <michael.weiss@...ec.fraunhofer.de>
To:     Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Paul Moore <paul@...l-moore.com>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Miklos Szeredi <miklos@...redi.hu>,
        Amir Goldstein <amir73il@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <gyroidos@...ec.fraunhofer.de>,
        Michael Weiß <michael.weiss@...ec.fraunhofer.de>
Subject: [RESEND RFC PATCH v2 07/14] drm/amdkfd: Switch from devcgroup_check_permission to security hook

The new lsm-based cgroup device access control provides an
equivalent hook to check device permission. Thus, switch to the
more generic security hook security_dev_permission() instead of
directly calling devcgroup_check_permission().

Signed-off-by: Michael Weiß <michael.weiss@...ec.fraunhofer.de>
---
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index fa24e1852493..50979f332e38 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -38,7 +38,7 @@
 #include <linux/seq_file.h>
 #include <linux/kref.h>
 #include <linux/sysfs.h>
-#include <linux/device_cgroup.h>
+#include <linux/security.h>
 #include <drm/drm_file.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_device.h>
@@ -1487,9 +1487,8 @@ static inline int kfd_devcgroup_check_permission(struct kfd_node *kfd)
 #if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
 	struct drm_device *ddev = adev_to_drm(kfd->adev);
 
-	return devcgroup_check_permission(DEVCG_DEV_CHAR, DRM_MAJOR,
-					  ddev->render->index,
-					  DEVCG_ACC_WRITE | DEVCG_ACC_READ);
+	return security_dev_permission(S_IFCHR, MKDEV(DRM_MAJOR, ddev->render->index),
+				       MAY_WRITE | MAY_READ);
 #else
 	return 0;
 #endif
-- 
2.30.2