mesa-noglu: Add support for grsecurity

pkgs/development/libraries/mesa/default.nix

@@ -2,6 +2,7 @@
 , python, libxml2Python, file, expat, makedepend
 , libdrm, xorg, wayland, udev, llvm, libffi
 , libvdpau, libelf
+, grsecEnabled
 , enableTextureFloats ? false # Texture floats are patented, see docs/patents.txt
 , enableExtraFeatures ? false # not maintained
 }:
@@ -41,6 +42,7 @@ stdenv.mkDerivation {
 
   patches = [
     ./static-gallium.patch
+    ./glx_ro_text_segm.patch # fix for grsecurity/PaX
    # TODO: revive ./dricore-gallium.patch when it gets ported (from Ubuntu),
    #  as it saved ~35 MB in $drivers; watch https://launchpad.net/ubuntu/+source/mesa/+changelog
   ];
@@ -79,7 +81,8 @@ stdenv.mkDerivation {
       "--enable-openvg" "--enable-gallium-egl" # not needed for EGL in Gallium, but OpenVG might be useful
       #"--enable-xvmc" # tests segfault with 9.1.{1,2,3}
       #"--enable-opencl" # ToDo: opencl seems to need libclc for clover
-    ];
+    ]
+    ++ optional grsecEnabled "--enable-glx-rts"; # slight performance degradation, enable only for grsec
 
   nativeBuildInputs = [ pkgconfig python makedepend file flex bison ];
 

pkgs/development/libraries/mesa/glx_ro_text_segm.patch

@@ -0,0 +1,25 @@
+diff --git a/configure.ac b/configure.ac
+index 5068913..3d4271e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -429,6 +429,20 @@ AC_SUBST([GLESv2_LIB_GLOB])
+ AC_SUBST([VG_LIB_GLOB])
+ AC_SUBST([GLAPI_LIB_GLOB])
+ 
++
++dnl readonly text segment on x86 hardened platforms
++AC_ARG_ENABLE([glx_rts],
++    [AS_HELP_STRING([--enable-glx-rts],
++        [on x86, use a readonly text segment for libGL @<:@default=disabled@:>@])],
++    [enable_glx_rts="$enableval"],
++    [enable_glx_rts=no])
++if test "x$enable_glx_rts" = xyes; then
++    DEFINES="$DEFINES -DGLX_X86_READONLY_TEXT"
++else
++    enable_glx_rts=no
++fi
++
++
+ dnl
+ dnl Arch/platform-specific settings
+ dnl

pkgs/top-level/all-packages.nix

@@ -5483,7 +5483,10 @@ let
 
   mesaSupported = lib.elem system lib.platforms.mesaPlatforms;
 
-  mesa_original = callPackage ../development/libraries/mesa { };
+  mesa_original = callPackage ../development/libraries/mesa {
+    grsecEnabled = config.grsecurity or false;
+  };
+
   mesa_noglu = if stdenv.isDarwin
     then darwinX11AndOpenGL // { driverLink = mesa_noglu; }
     else mesa_original;