[MPlayer-users] Mplayer 0.60pre1 drops privileges?!?

[ellen at euronet.nl]

Hi,

I just compiled and installed Mplayer 0.60pre1, and set uid root,
just like I did with 0.50, but when I run it as a normal user, it
seems to forget or drop those privileges, no matter if I try to
use SVGA or DGA:

     ==============================================================

ellen:/ftp/linux > mplayer-0.60pre1 -vo svga /win95/videos/747_takeoff.mpg

MPlayer 0.60pre1 (C) 2000-2001 Arpad Gereoffy (see DOCS!)

CPU vendor name: AuthenticAMD  max cpuid level: 1
CPU: Advanced Micro Devices K6-2+/K6-III+ Sharptooth (Type: 5, Stepping: 0)
extended cpuid-level: 7
CPUflags: Type: 5 MMX: 1 MMX2: 0 3DNow: 1 3DNow2: 1 SSE: 0 SSE2: 0
Reading /home/ellen/.mplayer/codecs.conf: 18 audio & 40 video codecs
Font /home/ellen/.mplayer/font/font.desc loaded successfully! (102 chars)
Using Linux's hardware RTC timing (1024Hz)
Playing /win95/videos/747_takeoff.mpg
Not an URL!
header block 1 size: 0
Detected MPEG-PS file format!
VIDEO:  MPEG1  320x240  (aspect 1)  29.97 fps  1875.0 kbps (234.4 kbyte/s)
[V] filefmt:2  fourcc:0x10000001  size:320x240  fps:29.97  ftime:=0.0334
Detected audio codec: [mp3] drv:1 (MPEG layer-2, layer-3)
mp3lib: Processor ID: 5d0
mp3lib: Using AMD 3dnow-dsp(k7)! optimized decore.
AUDIO: srate=44100  chans=2  bps=2  sfmt=0x10  ratio: 28000->176400
Detected video codec: [mpeg12] drv:1 prio:0 (MPEG 1 or 2)
svgalib: Cannot get I/O permissions.

     ==============================================================

ellen:/ftp/linux > mplayer-0.60pre1 -vo dga /win95/videos/747_takeoff.mpg

MPlayer 0.60pre1 (C) 2000-2001 Arpad Gereoffy (see DOCS!)

CPU vendor name: AuthenticAMD  max cpuid level: 1
CPU: Advanced Micro Devices K6-2+/K6-III+ Sharptooth (Type: 5, Stepping: 0)
extended cpuid-level: 7
CPUflags: Type: 5 MMX: 1 MMX2: 0 3DNow: 1 3DNow2: 1 SSE: 0 SSE2: 0
Reading /home/ellen/.mplayer/codecs.conf: 18 audio & 40 video codecs
Font /home/ellen/.mplayer/font/font.desc loaded successfully! (102 chars)
Using Linux's hardware RTC timing (1024Hz)
Playing /win95/videos/747_takeoff.mpg
Not an URL!
header block 1 size: 0
Detected MPEG-PS file format!
VIDEO:  MPEG1  320x240  (aspect 1)  29.97 fps  1875.0 kbps (234.4 kbyte/s)
[V] filefmt:2  fourcc:0x10000001  size:320x240  fps:29.97  ftime:=0.0334
Detected audio codec: [mp3] drv:1 (MPEG layer-2, layer-3)
mp3lib: Processor ID: 5d0
mp3lib: Using AMD 3dnow-dsp(k7)! optimized decore.
AUDIO: srate=44100  chans=2  bps=2  sfmt=0x10  ratio: 28000->176400
Detected video codec: [mpeg12] drv:1 prio:0 (MPEG 1 or 2)
vo: X11 running at 1152x864 with depth 16 and 16 bits/pixel (":0.0" => local display)
vo_dga: Mode: depth=15, bpp=16, r=007c00, g=0003e0, b=00001f, conversion (slow), (-bpp 15) ...disabled by -bpp 16
vo_dga: Mode: depth=16, bpp=16, r=00f800, g=0007e0, b=00001f, native (fast),     (-bpp 16)
vo_dga: Mode: depth=24, bpp=24, r=ff0000, g=00ff00, b=0000ff, not supported :-(  (-bpp 24) ...disabled by -bpp 16
vo_dga: Mode: depth=24, bpp=32, r=ff0000, g=00ff00, b=0000ff, not supported :-(  (-bpp 32) ...disabled by -bpp 16
mpeg2dec-0.2.0-release (C) 2000-2001 Aaron Holtzman & Michel Lespinasse
libmpeg2: Using MMX for IDCT transform
libmpeg2: Using 3DNOW for motion compensation
Movie-Aspect is undefined - no prescaling applied.
VO: [dga] 320x240 => 320x240 Planar YV12 
vo_dga: DGA 1.0 compatibility code: Using XF86VidMode for mode switching!
vo_dga: XF86VidMode Extension v0.8
vo_dga: Selected video mode  640 x  480 @  84 Hz @ depth 16, bitspp 16, video 320 x 240.
XF86DGAGetVideo: failed to open /dev/mem (Permission denied)

     ==============================================================

Running both as root works fine, though, and running 0.50 as a normal
users still works, too.  Permissions for the executables are:

-rwsr-sr-x   1 root     root       900916 Oct 25 20:59 mplayer-0.50
-rwsr-sr-x   1 root     root      1100040 Dec 26 02:33 mplayer-0.60pre1

Running Slackware Linux 7.1,
gcc version 2.95.2 19991024 (release)

Ellen
-- 

Ellen Geertsema               "All my life I wanted to be someone;
ellen at euronet.nl            I guess I should have been more specific."
                                                   -- Jane Wagner