1/* 2 * Copyright (c) 2012 Intel Corporation. All Rights Reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sub license, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial portions 14 * of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 19 * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR 20 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 21 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 22 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25#include "sysdeps.h" 26#include <unistd.h> 27#include <xf86drm.h> 28#include "va_drm_auth.h" 29#include "va_drm_auth_x11.h" 30 31#if defined __linux__ 32# include <sys/syscall.h> 33#endif 34 35/* Checks whether the thread id is the current thread */ 36static bool 37is_local_tid(pid_t tid) 38{ 39#if defined __linux__ 40 /* On Linux systems, drmGetClient() would return the thread ID 41 instead of the actual process ID */ 42 return syscall(SYS_gettid) == tid; 43#else 44 return false; 45#endif 46} 47 48/* Checks whether DRM connection is authenticated */ 49bool 50va_drm_is_authenticated(int fd) 51{ 52 pid_t client_pid; 53 int i, auth, pid, uid; 54 unsigned long magic, iocs; 55 bool is_authenticated = false; 56 57 client_pid = getpid(); 58 for (i = 0; !is_authenticated; i++) { 59 if (drmGetClient(fd, i, &auth, &pid, &uid, &magic, &iocs) != 0) 60 break; 61 is_authenticated = auth && (pid == client_pid || is_local_tid(pid)); 62 } 63 return is_authenticated; 64} 65 66/* Try to authenticate the DRM connection with the supplied magic id */ 67bool 68va_drm_authenticate(int fd, uint32_t magic) 69{ 70 /* XXX: try to authenticate through Wayland, etc. */ 71#ifdef HAVE_VA_X11 72 if (va_drm_authenticate_x11(fd, magic)) 73 return true; 74#endif 75 76 /* Default: root + master privs are needed for the following call */ 77 return drmAuthMagic(fd, magic) == 0; 78} 79