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11fcda8753
The code in XkbVModMaskText() allocates a fixed sized buffer on the stack and copies the virtual mod name. There's actually two issues in the code that can lead to a buffer overflow. First, the bound check mixes pointers and integers using misplaced parenthesis, defeating the bound check. But even though, if the check fails, the data is still copied, so the stack overflow will occur regardless. Change the logic to skip the copy entirely if the bound check fails. CVE-2025-26595, ZDI-CAN-25545 This vulnerability was discovered by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net> Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1828> |
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| .. | ||
| ddxBeep.c | ||
| ddxCtrls.c | ||
| ddxKillSrv.c | ||
| ddxLEDs.c | ||
| ddxLoad.c | ||
| ddxPrivate.c | ||
| ddxVT.c | ||
| maprules.c | ||
| meson.build | ||
| README.compiled | ||
| xkb-procs.h | ||
| xkb.c | ||
| xkbAccessX.c | ||
| xkbActions.c | ||
| XKBAlloc.c | ||
| xkbDflts.h | ||
| xkbEvents.c | ||
| xkbfile_priv.h | ||
| xkbfmisc.c | ||
| xkbfmisc_priv.h | ||
| XKBGAlloc.c | ||
| xkbgeom.h | ||
| xkbInit.c | ||
| xkbLEDs.c | ||
| XKBMAlloc.c | ||
| XKBMisc.c | ||
| xkbout.c | ||
| xkbout_priv.h | ||
| xkbPrKeyEv.c | ||
| xkbsrv_priv.h | ||
| xkbSwap.c | ||
| xkbtext.c | ||
| xkbtext_priv.h | ||
| xkbUtils.c | ||
| XKM_file_format.txt | ||
| xkmread.c | ||
The X server uses this directory to store the compiled version of the
current keymap and/or any scratch keymaps used by clients. The X server
or some other tool might destroy or replace the files in this directory,
so it is not a safe place to store compiled keymaps for long periods of
time. The default keymap for any server is usually stored in:
X<num>-default.xkm
where <num> is the display number of the server in question, which makes
it possible for several servers *on the same host* to share the same
directory.
Unless the X server is modified, sharing this directory between servers on
different hosts could cause problems.