Alejandro Colomar
8b36662205
GNU Hurd doesn't define LOGIN_NAME_MAX. GNU Hurd recommends having no
system limits. When a program needs a limit, because it needs to
validate user input, it is recommended that each program defines its own
limit macros. The rationale is that this avoids hard-coded limits in
ABIs, which cannot be modified ever.
However, that doesn't mean that programs should have no limits at all.
We use this limit for validating user input, and so we shouldn't allow
anything just because the system doesn't want to set a limit.
So, when sysconf(2) returns -1, either due to an error or due to a claim
for no limits, we must fall back to the LOGIN_NAME_MAX value. And if
the system doesn't define that value, we must define it ourselves (we're
more or less free to choose any value, so let's pick the one that glibc
provides nowadays).
Fixes: 6a1f45d932 (2024-02-04; "lib/chkname.c: Support unlimited user name lengths")
Closes: <https://github.com/shadow-maint/shadow/issues/1166>
Cc: Chris Hofstaedtler <zeha@debian.org>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
shadow-utils
Introduction
The shadow-utils package includes the necessary programs for converting UNIX password files to the shadow password format, plus programs for managing user and group accounts. The pwconv command converts passwords to the shadow password format. The pwunconv command unconverts shadow passwords and generates a passwd file (a standard UNIX password file). The pwck command checks the integrity of password and shadow files. The lastlog command prints out the last login times for all users. The useradd, userdel, and usermod commands are used for managing user accounts. The groupadd, groupdel, and groupmod commands are used for managing group accounts.
Sites
Code
The main development branch is at https://github.com/shadow-maint/shadow.git
See STABLE.md for a list of supported stable branches.
Contacts
There are several ways to contact us:
- the general discussion mailing list
- the #shadow IRC channel on libera.chat:
- irc://irc.libera.chat/shadow
Mailing archives
- the general discussion mailing list archive
- the commit mailing list archive, only used for historical purposes
Contributions
Contributions are welcome. Follow the guidelines before posting any patches.
Authors and maintainers
Authors and maintainers are listed in AUTHORS.md.