Lennart Poettering 57c03b1e6e seccomp: drop mincore() from @system-service syscall filter group
Previously, this system call was included in @system-service since it is
a "getter" only, i.e. only queries information, and doesn't change
anything, and hence was considered not risky.

However, as it turns out, mincore() is actually security sensitive, see
the discussion here:

https://lwn.net/Articles/776034/

Hence, let's adjust the system call filter and drop mincore() from it.

This constitues a compatibility break to some level, however I presume
we can get away with this as the systemcall is pretty exotic. The fact
that it is pretty exotic is also reflected by the fact that the kernel
intends to majorly change behaviour of the system call soon (see the
linked LWN article)
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systemd - System and Service Manager

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