** Changed in: x11-utils (Fedora)
Status: Unknown => Won't Fix
** Changed in: x11-utils (Fedora)
Importance: Unknown => Undecided
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This bug was fixed in the package x11-utils - 7.6+4ubuntu0.1
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x11-utils (7.6+4ubuntu0.1) precise-proposed; urgency=low
* Add 100-xwininfo-bad-screen.patch: Fix wininfo segfault when called
with out-of-range display number.
(LP: #1028274)
-- Bryce Harrington
After install package from proposed, there is no longer segfault.
After set out-of-range display number it just displays:
xwininfo -root -display :0.1
xwininfo: error: unable to access screen 1, max is 0
Verification done.
** Changed in: x11-utils (Ubuntu Precise)
Assignee: (unassigned)
Fixes pushed to git master for next releases:
To ssh://git.freedesktop.org/git/xorg/app/xwininfo
53564df..aedc2ec master - master
To ssh://git.freedesktop.org/git/xcb/libxcb
ed93a6a..ff53285 master - master
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** Changed in: x11-utils
Status: In Progress = Fix Released
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https://bugs.launchpad.net/bugs/1028274
Title:
xwininfo segfaults if given a non-existent screen with
Hello David, or anyone else affected,
Accepted x11-utils into precise-proposed. The package will build now and
be available at
http://launchpad.net/ubuntu/+source/x11-utils/7.6+4ubuntu0.1 in a few
hours, and then in the -proposed repository.
Please help us by testing this new package. See
** Branch linked: lp:~ubuntu-branches/ubuntu/precise/x11-utils/precise-
proposed
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Title:
xwininfo segfaults if given a non-existent
With current master (5037f79e8f6a36d3c524a2dd8150cf96c31b7106):
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0001
0x000116e1 in Select_Window (dpy=0x10081bc00, screen=0x100822bd4,
descend=1) at dsimple.c:180
180
Created attachment 66114
libxcb patch, introducing XCB_CONN_CLOSED_INVALID_SCREEN
Addresses a couple issues in the original patch
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Created attachment 66113
0001-Return-connection-failure-if-display-string-specifie.patch
Here's a patch for libxcb based on alanc's libxcb patch, but it
introduces a new error code to allow callers to tell the difference
between the two errors.
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Created attachment 66115
Yet another revision of libxcb patch
Merged my fixes with Jeremy's improvements to the previous libxcb patches.
Yay for remote pair programming via bugzilla/irc! (Sorry for the rapid
fire noise for everyone else.)
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Took the question of where to check, libxcb or callers like xwininfo,
to the xcb mailing list for discussion:
http://lists.freedesktop.org/archives/xcb/2012-August/007840.html
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** Changed in: x11-utils
Status: Confirmed = In Progress
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Title:
xwininfo segfaults if given a non-existent screen with
** Bug watch added: freedesktop.org Bugzilla #53242
https://bugs.freedesktop.org/show_bug.cgi?id=53242
** Also affects: x11-utils via
https://bugs.freedesktop.org/show_bug.cgi?id=53242
Importance: Unknown
Status: Unknown
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** Changed in: x11-utils (Ubuntu)
Status: New = Triaged
** Changed in: x11-utils (Ubuntu)
Importance: Undecided = High
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** Also affects: x11-utils (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: x11-utils (Ubuntu Quantal)
Importance: High
Status: Triaged
** Changed in: x11-utils (Ubuntu Precise)
Status: New = Triaged
** Changed in: x11-utils (Ubuntu Precise)
I've verified the bug on precise. Probably affects quantal too. The
suggested patch looks sensible enough, and I can confirm it does make it
stop segfaulting.
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This bug was fixed in the package x11-utils - 7.7~1ubuntu1
---
x11-utils (7.7~1ubuntu1) quantal; urgency=low
* Add 100-xwininfo-bad-screen.patch: Fix wininfo segfault when called
with out-of-range display number.
(LP: #1028274)
-- Bryce Harrington br...@ubuntu.com Mon,
** Description changed:
- I have a dual-head setup that only presents one screen to X
- (subdivided by xinerama).
+ [Impact]
+ xwininfo segfaults if called with an out-of-range display number.
+
+ [Test Case]
+ 1. xwininfo -root -display :0.0
+ 2. xwininfo -root -display :0.1
+
+ Actual
** Branch linked: lp:ubuntu/x11-utils
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Title:
xwininfo segfaults if given a non-existent screen with -display option
To manage
David, finally, thanks for contributing this patch to Ubuntu. I don't
know how widely used xwininfo is, but it's always good to make things
not crash!
Could I ask you to do one last thing. Please send your patch to the
upstream developers. You can do this either by filing a bug report at
No probs, I'll look into an upstream submit.
My lingering concern is over how many other bits of code use libxcb in this
way, and may have had their assumptions broken. I.e. is the right place to
fix this problem longer term in libxcb? I guess I should let upstream decide.
What's the
Public bug reported:
I have a dual-head setup that only presents one screen to X
(subdivided by xinerama).
If I run xwininfo -root -display :0.0 it works as expected, giving the root
window information for my single screen.
If I run xwininfo -root -display :0.1 it segfaults.
I expect it to
** Patch added: Patch against x11-utils-7.6+4
https://bugs.launchpad.net/bugs/1028274/+attachment/3233721/+files/01-xwininfo-bad-screen
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** Bug watch added: Red Hat Bugzilla #808561
https://bugzilla.redhat.com/show_bug.cgi?id=808561
** Also affects: x11-utils (Fedora) via
https://bugzilla.redhat.com/show_bug.cgi?id=808561
Importance: Unknown
Status: Unknown
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