3151e489e4
The BigRequest extension allows requests larger than the 16-bit length limit. It uses integers for the request length and checks for the size not to exceed the maxBigRequestSize limit, but does so after translating the length to integer by multiplying the given size in bytes by 4. In doing so, it might overflow the integer size limit before actually checking for the overflow, defeating the purpose of the test. To avoid the issue, make sure to check that the request size does not overflow the maxBigRequestSize limit prior to any conversion. The caller Dispatch() function however expects the return value to be in bytes, so we cannot just return the converted value in case of error, as that would also overflow the integer size. To preserve the existing API, we use a negative value for the X11 error code BadLength as the function only return positive values, 0 or -1 and update the caller Dispatch() function to take that case into account to return the error code to the offending client. CVE-2025-49176 This issue was discovered by Nils Emmerich <nemmerich@ernw.de> and reported by Julian Suleder via ERNW Vulnerability Disclosure. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2024> |
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XLibre Xserver
Xlibre is a fork of the Xorg Xserver with lots of code cleanups and enhanced functionality.
This fork was necessary since toxic elements within Xorg projects, moles from BigTech, are boycotting any substantial work on Xorg, in order to destroy the project, to eliminate competition of their own products. Classic "embrace, extend, extinguish" tactics.
Right after journalists first began covering the planned fork Xlibre, on June 6th 2025, Redhat employees started a purge on the Xlibre founder's GitLab account on freedesktop.org: deleted the git repo, tickets, merge requests, etc, and so fired the shot that the whole world heard.
This is an independent project, not at all affiliated with BigTech or any of their subsidiaries or tax evasion tools, nor any political activists groups, state actors, etc. It's explicitly free of any "DEI" or similar discriminatory policies. Anybody who's treating others nicely is welcomed.
It doesn't matter which country you're coming from, your political views, your race, your sex, your age, your food menu, whether you wear boots or heels, whether you're furry or fairy, Conan or McKay, comic character, a small furry creature from Alpha Centauri, or just a boring average person. Anybody who's interested in bringing X forward is welcome.
Together we'll make X great again!
Upgrade notice
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Module ABIs have changed - drivers MUST be recompiled against this Xserver version, otherwise the Xserver can crash or fail to start up correctly.
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If your console is locked up (no input possible, not even VT switch), then most likely the input driver couldn't be loaded due to a version mismatch. When unsure, it's best to be prepared to ssh into your machine from another one or set a timer that's calling
chvt 1after certain time, so you don't need a cold reboot. -
Proprietary Nvidia drivers might break: they still haven't managed to do even simple cleanups to catch up with Xorg master for about a year. All attempts to get into direct mail contact have failed. We're trying to work around this, but cannot give any guarantees.
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Most Xorg drivers should run as-is (once recompiled!), with some exceptions. See
.gitlab-ci.ymlfor the versions/branches built along with Xlibre.
Driver repositories
Since Redhat had deleted and banned all X11Libre repositories from freedesktop.org, the driver repositories are now moved to GitHub:
Contact
| Mailing list: | https://www.freelists.org/list/xlibre |
| Telegram channel: | https://t.me/x11dev |
| Matrix room (mirror of tg group): | https://matrix.to/#/#xlibre:matrix.org |