Re: X server bug?

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Mouse <[email protected]> wrote:
    > I've just run into what I consider to be a bug in an X server.  I first
    > saw with a relatively recent Ubuntu on a work machine, which prompted
    > me to look for it elsewhere.

    > I do not see it with the MIT server I use on 1.4T.  I do not see it
    > with the server built from 5.2's /usr/xsrc.  But I *do* see it with the
    > server built from 9.1's /usr/xsrc.

    > The bug is that, when a client issues a ChangeGC request trying to set
    > a clip-mask pixmap with 0x2000001a as the pixmap ID (not a valid ID; X
    > resource IDs never have any of the top three bits set), the invalid ID
    > value in the resulting error is 0 instead of 0x2000001a.  (This

Like it has masked off those bits early, and then can't reply with the broken
resource ID.   But, I guess if that was the case, it would say 0x1a... so..

I'm curious how you ran into this... some application that doesn't know the
limits of resource IDs?

I had to add #include <stdlib.h>, and I had to build with -lX11:
   cc     test-err-1.c   -o test-err-1 -lX11
   (I had done: "make test-err-1" at first)

obiwan-[~/src](3.3.8) mcr 10315 %./test-err-1
X Error of failed request:  BadPixmap (invalid Pixmap parameter)
  Major opcode of failed request:  56 (X_ChangeGC)
  Resource id in failed request:  0x0
  Serial number of failed request:  7
  Current serial number in output stream:  9

version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    12101007
X.Org version: 21.1.7

This is devuan Linux, so maybe redudant with your report of Ubuntu.

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