Lukas Schauer

The issue is related to a regression introduced by a commit that added general notification queue support, which caused resized pipes to lock up under certain conditions. This occurred because the commit resizing the pipe ring size was moved to a different function, resulting in the wakeup for `pipe->wr wait` being triggered before actually raising `pipe->max usage`. If a pipe was full before the resize occurred, it would result in the wakeup never actually triggering `pipe write`. The vulnerability is associated with incorrect blocking in the `pipe resize ring()` and `pipe set size()` functions in `fs/pipe.c`. Exploitation of this vulnerability could allow an attacker to cause a denial of service.

A flaw in the `.charkeys` procedure of ghostscript allows scripts to bypass `-dSAFER` restrictions by not properly securing its privileged calls. This enables an attacker to create a specially crafted PostScript file that could escalate privileges within Ghostscript, access files outside of restricted areas, or execute commands. The exploitation of this flaw may allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service.