Package: libgl1-mesa-swx11
Version: 8.0.5-4+deb7u2
Severity: important
Dear Maintainer,
I discovered that the libGL.so.1 that comes with libgl1-mesa-swx11
contains a bug that may cause it to return a list of GLXFBConfigs that
contain NULLs, in violation of the API.
The reason is that Fake_glXGetFBConfigs, in src/mesa/drivers/x11/fakeglx.c,
maps all the X visuals it gets from XGetVisualInfo via create_glx_visual
in order to create its returned list, but create_glx_visual may return
NULL if an X visual is unfit for GL. Clearly, it should avoid putting
those NULLs in the returned list.
You can see the results of this in the output of glxinfo, included below.
Some of the GLXFBConfigs (the 1st and 3rd in the list) contain only
zeroes for all their attributes, which is the result of glxinfo passing
those NULL FBConfigs through glXGetFBConfigAttrib (and not checking its
return value).
Admittedly, this is on stable, and I can only assume the bug is fixed in
later Mesa versions, but I think the bug is grave enough that it should
be fixed on stable. I don't see how libgl1-mesa-swx11 can possible be
usable under these circumstances, unless one is so lucky so as to only
happen to have X visuals that are all usable for GL.
--
Fredrik Tolf
-- Package-specific info:
glxinfo:
--------
name of display: :6
display: :6 screen: 0
direct rendering: Yes
server glx vendor string: Brian Paul
server glx version string: 1.4 Mesa 8.0.5
server glx extensions:
GLX_MESA_copy_sub_buffer, GLX_MESA_pixmap_colormap,
GLX_MESA_release_buffers, GLX_ARB_get_proc_address,
GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_SGIX_fbconfig, GLX_SGIX_pbuffer
client glx vendor string: Brian Paul
client glx version string: 1.4 Mesa 8.0.5
client glx extensions:
GLX_MESA_copy_sub_buffer, GLX_MESA_pixmap_colormap,
GLX_MESA_release_buffers, GLX_ARB_get_proc_address,
GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_SGIX_fbconfig, GLX_SGIX_pbuffer
GLX version: 1.4
GLX extensions:
GLX_MESA_copy_sub_buffer, GLX_MESA_pixmap_colormap,
GLX_MESA_release_buffers, GLX_ARB_get_proc_address,
GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_SGIX_fbconfig, GLX_SGIX_pbuffer
OpenGL vendor string: Brian Paul
OpenGL renderer string: Mesa X11
OpenGL version string: 2.1 Mesa 8.0.5
OpenGL shading language version string: 1.20
OpenGL extensions:
GL_ARB_multisample, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture,
GL_EXT_polygon_offset, GL_EXT_subtexture, GL_EXT_texture_object,
GL_EXT_vertex_array, GL_EXT_compiled_vertex_array, GL_EXT_texture,
GL_EXT_texture3D, GL_IBM_rasterpos_clip, GL_ARB_point_parameters,
GL_EXT_draw_range_elements, GL_EXT_packed_pixels, GL_EXT_point_parameters,
GL_EXT_rescale_normal, GL_EXT_separate_specular_color,
GL_EXT_texture_edge_clamp, GL_SGIS_generate_mipmap,
GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
GL_SGIS_texture_lod, GL_ARB_multitexture, GL_IBM_multimode_draw_arrays,
GL_IBM_texture_mirrored_repeat, GL_3DFX_texture_compression_FXT1,
GL_ARB_texture_cube_map, GL_ARB_texture_env_add, GL_ARB_transpose_matrix,
GL_EXT_blend_func_separate, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
GL_EXT_secondary_color, GL_EXT_texture_env_add,
GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod_bias,
GL_INGR_blend_func_separate, GL_MESA_resize_buffers, GL_NV_blend_square,
GL_NV_light_max_exponent, GL_NV_texgen_reflection,
GL_NV_texture_env_combine4, GL_SUN_multi_draw_arrays,
GL_ARB_texture_border_clamp, GL_ARB_texture_compression,
GL_EXT_framebuffer_object, GL_EXT_texture_env_combine,
GL_EXT_texture_env_dot3, GL_MESA_window_pos, GL_NV_packed_depth_stencil,
GL_NV_texture_rectangle, GL_NV_vertex_program, GL_ARB_depth_texture,
GL_ARB_occlusion_query, GL_ARB_shadow, GL_ARB_shadow_ambient,
GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar,
GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat,
GL_ARB_window_pos, GL_ATI_envmap_bumpmap, GL_ATI_fragment_shader,
GL_EXT_stencil_two_side, GL_EXT_texture_cube_map, GL_NV_depth_clamp,
GL_NV_fragment_program, GL_NV_point_sprite, GL_NV_vertex_program1_1,
GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, GL_ARB_draw_buffers,
GL_ARB_fragment_program, GL_ARB_fragment_shader, GL_ARB_shader_objects,
GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ATI_draw_buffers,
GL_ATI_texture_env_combine3, GL_EXT_depth_bounds_test,
GL_EXT_shadow_funcs, GL_EXT_stencil_wrap, GL_MESA_pack_invert,
GL_MESA_ycbcr_texture, GL_ARB_depth_clamp, GL_ARB_fragment_program_shadow,
GL_ARB_half_float_pixel, GL_ARB_occlusion_query2, GL_ARB_point_sprite,
GL_ARB_shading_language_100, GL_ARB_sync, GL_ARB_texture_non_power_of_two,
GL_ARB_vertex_buffer_object, GL_ATI_blend_equation_separate,
GL_EXT_blend_equation_separate, GL_OES_read_format,
GL_ARB_pixel_buffer_object, GL_ARB_texture_compression_rgtc,
GL_ARB_texture_rectangle, GL_ATI_texture_compression_3dc,
GL_EXT_pixel_buffer_object, GL_EXT_texture_compression_rgtc,
GL_EXT_texture_mirror_clamp, GL_EXT_texture_rectangle,
GL_EXT_texture_sRGB, GL_EXT_texture_shared_exponent,
GL_ARB_framebuffer_object, GL_EXT_framebuffer_blit,
GL_EXT_framebuffer_multisample, GL_EXT_packed_depth_stencil,
GL_NV_fragment_program_option, GL_APPLE_object_purgeable,
GL_ARB_vertex_array_object, GL_ATI_separate_stencil,
GL_ATI_texture_mirror_once, GL_EXT_draw_buffers2, GL_EXT_draw_instanced,
GL_EXT_gpu_program_parameters, GL_EXT_texture_array,
GL_EXT_texture_compression_latc, GL_EXT_texture_sRGB_decode,
GL_EXT_timer_query, GL_MESA_texture_array, GL_ARB_copy_buffer,
GL_ARB_draw_instanced, GL_ARB_half_float_vertex, GL_ARB_map_buffer_range,
GL_ARB_texture_rg, GL_ARB_texture_swizzle, GL_ARB_vertex_array_bgra,
GL_EXT_separate_shader_objects, GL_EXT_texture_swizzle,
GL_EXT_vertex_array_bgra, GL_NV_conditional_render,
GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location,
GL_ARB_fragment_coord_conventions, GL_ARB_provoking_vertex,
GL_EXT_provoking_vertex, GL_ARB_robustness, GL_ARB_texture_storage
4 GLX Visuals
visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
----------------------------------------------------------------------------
0x022 8 gs 0 8 0 r y . 2 3 3 0 . . 0 16 8 16 16 16 16 0 0 None
0x024 8 tc 0 8 0 r y . 3 3 2 0 . . 0 16 8 16 16 16 0 0 0 None
0x025 8 dc 0 8 0 r y . 3 3 2 0 . . 0 16 8 16 16 16 16 0 0 None
0x026 8 sg 0 8 0 r y . 2 3 3 0 . . 0 16 8 16 16 16 16 0 0 None
6 GLXFBConfigs:
visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
----------------------------------------------------------------------------
0x000 0 sg 1 0 0 . . 0 0 0 0 . . 0 0 0 0 0 0 0 0 0 None
0x022 8 gs 0 8 0 r y . 2 3 3 0 . . 0 16 8 16 16 16 16 0 0 None
0x000 0 gs 1 0 0 . . 0 0 0 0 . . 0 0 0 0 0 0 0 0 0 None
0x024 8 tc 0 8 0 r y . 3 3 2 0 . . 0 16 8 16 16 16 16 0 0 None
0x025 8 dc 0 8 0 r y . 3 3 2 0 . . 0 16 8 16 16 16 16 0 0 None
0x026 8 sg 0 8 0 r y . 2 3 3 0 . . 0 16 8 16 16 16 16 0 0 None
/usr/share/bug/xserver-xorg-core/script not available
-- System Information:
Debian Release: 7.3
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.13.0 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libgl1-mesa-swx11 depends on:
ii libc6 2.13-38
ii libgcc1 1:4.7.2-5
ii libosmesa6 8.0.5-4+deb7u2
ii libstdc++6 4.7.2-5
ii libx11-6 2:1.5.0-1+deb7u1
ii libxext6 2:1.3.1-2+deb7u1
ii multiarch-support 2.13-38
libgl1-mesa-swx11 recommends no packages.
libgl1-mesa-swx11 suggests no packages.
-- no debconf information
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