[Bug 1612] New: Bad random generator

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Oct 12 15:29:45 PDT 2004

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           Summary: Bad random generator
           Product: xorg
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: sandmann at daimi.au.dk

In xc/programs/Xserver/os/auth.c we have this code:

/* A random number generator that is more unpredictable
   than that shipped with some systems.
   This code is taken from the C standard. */

static unsigned long int next = 1;

static int
    next = next * 1103515245 + 12345;
    return (unsigned int)(next/65536) % 32768;

static void
xdm_srand(unsigned int seed)
    next = seed;

GenerateRandomData (int len, char *buf)
    static int seed;
    int value;
    int i;

    seed += GetTimeInMillis();
    xdm_srand (seed);
    for (i = 0; i < len; i++)
        value = xdm_rand ();
        buf[i] ^= (value & 0xff00) >> 8;

    /* XXX add getrusage, popen("ps -ale") */

#endif /* XCSECURITY */

which is not a very good random generator.        
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