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doc: mention that setfsuid() is a reason why UIDs >= 2147483648 are icky

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Lennart Poettering 2022-03-18 11:49:05 +01:00
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11
docs/UIDS-GIDS.md
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@ -283,11 +283,12 @@ pre-defined purposes between Linux, generic low-level distributions and
ranges.
Note that the range 2147483648…4294967294 (i.e. 2^31…2^32-2) should be handled
with care. Various programs (including kernel file systems, see `devpts`) have
trouble with UIDs outside of the signed 32bit range, i.e any UIDs equal to or
above 2147483648. It is thus strongly recommended to stay away from this range
in order to avoid complications. This range should be considered reserved for
future, special purposes.
with care. Various programs (including kernel file systems — see `devpts` — or
even kernel syscalls – see `setfsuid()`) have trouble with UIDs outside of the
signed 32bit range, i.e any UIDs equal to or above 2147483648. It is thus
strongly recommended to stay away from this range in order to avoid
complications. This range should be considered reserved for future, special
purposes.
## Notes on resolvability of user and group names