From eec8fd0277e37cf447b88c6be181e81df867bcf1 Mon Sep 17 00:00:00 2001 From: Odin Ugedal Date: Fri, 3 Apr 2020 19:55:28 +0200 Subject: device_cgroup: Cleanup cgroup eBPF device filter code Original cgroup v2 eBPF code for filtering device access made it possible to compile with CONFIG_CGROUP_DEVICE=n and still use the eBPF filtering. Change commit 4b7d4d453fc4 ("device_cgroup: Export devcgroup_check_permission") reverted this, making it required to set it to y. Since the device filtering (and all the docs) for cgroup v2 is no longer a "device controller" like it was in v1, someone might compile their kernel with CONFIG_CGROUP_DEVICE=n. Then (for linux 5.5+) the eBPF filter will not be invoked, and all processes will be allowed access to all devices, no matter what the eBPF filter says. Signed-off-by: Odin Ugedal Acked-by: Roman Gushchin Signed-off-by: Tejun Heo --- drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index 4a3049841086..c24cad3c64ed 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -1050,7 +1050,7 @@ void kfd_dec_compute_active(struct kfd_dev *dev); /* Check with device cgroup if @kfd device is accessible */ static inline int kfd_devcgroup_check_permission(struct kfd_dev *kfd) { -#if defined(CONFIG_CGROUP_DEVICE) +#if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF) struct drm_device *ddev = kfd->ddev; return devcgroup_check_permission(DEVCG_DEV_CHAR, ddev->driver->major, -- cgit v1.2.3-70-g09d2