drm/panthor: Restrict high priorities on group_create#260
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igorpecovnik merged 1 commit intoarmbian:rk-6.1-rkr3from Oct 9, 2024
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We were allowing any users to create a high priority group without any permission checks. As a result, this was allowing possible denial of service. We now only allow the DRM master or users with the CAP_SYS_NICE capability to set higher priorities than PANTHOR_GROUP_PRIORITY_MEDIUM. As the sole user of that uAPI lives in Mesa and hardcode a value of MEDIUM [1], this should be safe to do. Additionally, as those checks are performed at the ioctl level, panthor_group_create now only check for priority level validity. [1]https://gitlab.freedesktop.org/mesa/mesa/-/blob/f390835074bdf162a63deb0311d1a6de527f9f89/src/gallium/drivers/panfrost/pan_csf.c#L1038 Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com> Fixes: de85488 ("drm/panthor: Add the scheduler logical block") Cc: stable@vger.kernel.org Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240903144955.144278-2-mary.guillemard@collabora.com
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This commit is from https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/panthor?h=v6.11.2&id=5f7762042f8a5377bd8a32844db353c0311a7369, after backporting this, we should have synced with mainline 6.11.