Messages in this thread | | | Date | Sun, 19 Feb 2023 16:21:46 -0500 | From | Storm Dragon <> | Subject | Bug with /dev/vcs* devices |
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Howdy,
This is my first time ever submitting a kernel bug, so I apologize if this is the wrong place. As per the instructions I found, I first filed a bug in Arch Linux:
https://bugs.archlinux.org/task/77575
I will add the contents of the response here:
For the record, here are the 2 associated mailing list threads [1][2].
The reason why it affects both LTS and current linux is because it appears a security patch was applied to both trees to fix a UAF (use after free) bug.
If that patch is problematic, you should report it upstream to the kernel folks. Maybe even email the patch author directly. It's this patch [3]. Please let us know what you find out.
[1] https://lists.archlinux.org/archives/list/arch-general%40lists.archlinux.org/thread/EOSHIVGUZLNAD7BPHSUGOXFYSAFWDYH7/ [2] https://lists.archlinux.org/archives/list/arch-general%40lists.archlinux.org/thread/S6R6UDUMX2LWL4HJ74MFNYOES45UBFLF/ [3] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/tty/vt/vc_screen.c?h=v5.15.94&id=fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18
----------End Response ----------
Methods for reproducing the bug are included in the link to the bug above. But I will include one of them here as well. As root:
[root@mjollnir ~]# cat /dev/vcsa1 cat: /dev/vcsa1: No such device or address
The contents is displayed very briefly before the No such device or address error.
Thank you, Storm [unhandled content-type:application/pgp-signature] | |