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Date: Mon, 1 Feb 2021 18:51:45 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Andy Lutomirski <luto@...capital.net>
Cc: LKML <linux-kernel@...r.kernel.org>, Jann Horn <jann@...jh.net>,
Christian Brauner <christian.brauner@...onical.com>
Subject: Re: forkat(int pidfd), execveat(int pidfd), other awful things?
> int execve_parent(int parent_pidfd, int root_dirfd, int cgroup_fd, int
> namespace_fd, const char *pathname, char *const argv[], char *const
> envp[]);
A variant on the same scheme would be:
int execve_remote(int pidfd, int root_dirfd, int cgroup_fd, int
namespace_fd, const char *pathname, char *const argv[], char *const
envp[]);
Unpriv'd process calls fork(), and from that fork sends its pidfd
through a unix socket to systemd-sudod, which then calls execve_remote
on that pidfd.
There are a lot of (potentially very bad) ways to skin this cat.
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