Data returned from Xlib/XGetEventData is not guaranteed to be aligned#610
Merged
not-fl3 merged 1 commit intonot-fl3:masterfrom Mar 22, 2026
Merged
Data returned from Xlib/XGetEventData is not guaranteed to be aligned#610not-fl3 merged 1 commit intonot-fl3:masterfrom
not-fl3 merged 1 commit intonot-fl3:masterfrom
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Owner
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Thanks for PR! |
Contributor
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Thanks for merging! |
Contributor
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When reading Probably could just do the following? let dx = std::ptr::read_unaligned((*raw_event).raw_values);
let dy = std::ptr::read_unaligned((*raw_event).raw_values.add(1)); |
Contributor
Author
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Thanks for pointing this out! Thought I properly tested this on X11, but my system is still running Wayland apparently. I'll make a fix. |
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Fixes #394
Data returned from Xlib is not guaranteed to be aligned. This could cause a "misaligned pointer deference" panic when getting the mouse deltas. The mouse deltas are two doubles, but the buffer in which they are stored might not be 8 byte aligned. This apparently could happen quite easily on a Linux 32 bit system.
Tested it on a 32bit Raspberry PI. Also tested this on a Ubuntu 64bit, just to see It didn't break anything there.