dnsdist: Keep retained capabilities even when switching user/group #11761
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On Linux, we support retaining some capabilities if we are running as root (eeew) or as an unprivileged user with ambiant capabilities, but we did not yet support keeping these if we were started as root but then switched to a different user ID and/or group ID. This commit uses `PR_SET_KEEPCAPS`, when available, to do just that, to be able to retain the capabilities we need without running as a fully privileged users even when we cannot easily use ambiant capabilities.
Habbie
reviewed
Jul 5, 2022
Habbie
approved these changes
Jul 5, 2022
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Short description
On Linux, we support retaining some capabilities if we are running as root (eeew) or as an unprivileged user with ambient capabilities, but we did not yet support keeping these if we were started as root but then switched to a different user ID and/or group ID.
This commit uses
PR_SET_KEEPCAPS, when available, to do just that, to be able to retain the capabilities we need without running as a fully privileged users even when we cannot easily use ambient capabilities.Checklist
I have: