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Mention that /etc/apt/sources.list.d/* should be 644 (#138)

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* Update Desktop Linux Hardening.md

Signed-off-by: Tommy <contact@tommytran.io>
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Tommy 2023-06-30 03:32:49 -07:00 committed by GitHub
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content/posts/linux/Desktop Linux Hardening.md
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@ -180,6 +180,8 @@ Another option is [Kata Containers](https://katacontainers.io/) which masquerade
On distributions besides openSUSE, consider changing the default [umask](https://wiki.archlinux.org/title/Umask) for both root and regular users to `077` (symbolically, `u=rwx,g=,o=`). _On openSUSE, a umask of 077 can break snapper and is thus not recommended._
On Ubuntu, the "Software & Update" application will not work properly if the repository lists in `/etc/apt/sources.list.d` have the 600 permission. You should make sure that they have the 644 permission instead.
The configuration for this varies per distribution, but typically it can be set in `/etc/profile`, `/etc/bashrc`, or `/etc/login.defs`.
Note that, unlike on macOS, this will only change the umask for the shell. Files created by running applications will not have their permissions set to 600.