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  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 */
  36. static bool
  37. is_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 */
  49. bool
  50. va_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 */
  67. bool
  68. va_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.