Lennart Poettering
1155f44f48
Let's add two new helpers: mount_credentials_fs() and credentials_fs_mount_flags(). The former mounts a file system suitable for storing of unencrypted credentials at runtime (i.e. a ramfs or tmpfs). The latter determines the right mount flags to use for such a mount. Both functions mostly just take code from execute.c, but make two changes: 1. If the kernel supports it we'll use a tmpfs with the new "noswap" mount option instead of ramfs. Was added in kernel 6.4, hence is very recent, but tmpfs is so much less crappy than ramfs, hence worth it. 2. We'll set MS_NOSYMFOLLOW on the mounts if supported. These file systems should only contain regulra files, hence no need to allow symlinks.
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