Identifier / Programs / Linux and Unix
xmodmap
Utility for modifying keymaps and pointer button mappings in X. tldr-pages
GTFOBins file-read 1 documented command
How xmodmap is abused
file-read
-vEach abuse is GTFOBins's category and the options and words it uses; the full write-up is on GTFOBins's page for xmodmap.
1 documented command
file-read unprivileged, with sudo, as SUID
The read file content is corrupted by error prints.
xmodmap -v /path/to/input-fileThe command the identifier reads trips no Sigma process-creation rule. This command is, with GTFOBins’ notes, from GTFOBins, at commit acd524623f9c of 2026-05-27, under the GPL-3.0, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on GTFOBins’s page for xmodmap. The identifier reads the line that runs xmodmap.
Everyday use
Swap <LeftClick> and <RightClick> on the pointer
xmodmap -e 'pointer = 3 2 1'IdentifyReassign a key on the keyboard to another key
xmodmap -e 'keycode keycode = keyname'IdentifyDisable a key on the keyboard
xmodmap -e 'keycode keycode ='IdentifyNone of the 3 examples the identifier reads matches GTFOBins abuse or trips a Sigma process-creation rule.