Linux-PAM release 1.7.2

* build: enabled vendordir by default.
* pam_access: fixed stack overflow with huge configuration files.
* pam_env: enhanced error diagnostics when ignoring backslash at end of string.
* pam_faillock: skip clearing user's failed attempt when auth stack is not run.
* pam_mkhomedir: added support for vendordir skeleton directory.
* pam_unix: added support for pwaccessd.
* pam_unix: added support for PAM_CHANGE_EXPIRED_AUTHTOK.
* pam_unix: fixed password expiration warnings for large day values.
* pam_unix: hardened temporary file handling.
* Multiple minor bug fixes, build fixes, portability fixes,
  documentation improvements, and translation updates.

Linux-PAM release 1.7.1

* pam_access: do not resolve ttys or display variables as hostnames.
* pam_access: added "nodns" option to disallow resolving of tokens as hostnames
  (CVE-2024-10963).
* pam_limits: added support for rttime (RLIMIT_RTTIME).
* pam_namespace: fixed potential privilege escalation (CVE-2025-6020).
* meson: added support of elogind as a logind provider.
* Multiple minor bug fixes, build fixes, portability fixes,
  documentation improvements, and translation updates.

Linux-PAM release 1.7.0

* build: changed build system from autotools to meson.
* libpam_misc: use ECHOCTL in the terminal input
* pam_access: support UID and GID in access.conf
* pam_env: install environment file in vendordir if vendordir is enabled
* pam_issue: only count class user if logind support is enabled
* pam_limits: use systemd-logind instead of utmp if logind support is enabled
* pam_unix: compare password hashes in constant time
* Multiple minor bug fixes, build fixes, portability fixes,
  documentation improvements, and translation updates.

Linux-PAM release 1.6.1

* build: fail if specified configure options cannot be satisfied.
* pam_env: fixed --disable-econf --enable-vendordir support.
* pam_unix: do not warn if password aging is disabled.
* pam_unix: try to set uid to 0 before unix_chkpwd invocation.
* pam_unix: allow empty passwords with non-empty hashes.
* Multiple minor bug fixes, build fixes, portability fixes,
  documentation improvements, and translation updates.

Linux-PAM release 1.6.0

* Added support of configuration files with arbitrarily long lines.
* build: fixed build outside of the source tree.
* libpam: added use of getrandom(2) as a source of randomness if available.
* libpam: fixed calculation of fail delay with very long delays.
* libpam: fixed potential infinite recursion with includes.
* libpam: implemented string to number conversions validation when parsing
  controls in configuration.
* pam_access: added quiet_log option.
* pam_access: fixed truncation of very long group names.
* pam_canonicalize_user: new module to canonicalize user name.
* pam_echo: fixed file handling to prevent overflows and short reads.
* pam_env: added support of '\' character in environment variable values.
* pam_exec: allowed expose_authtok for password PAM_TYPE.
* pam_exec: fixed stack overflow with binary output of programs.
* pam_faildelay: implemented parameter ranges validation.
* pam_listfile: changed to treat \r and \n exactly the same in configuration.
* pam_mkhomedir: hardened directory creation against timing attacks.
  Please note that using *at functions leads to more open file handles
  during creation.
* pam_namespace: fixed potential local DoS (CVE-2024-22365).
* pam_nologin: fixed file handling to prevent short reads.
* pam_pwhistory: helper binary is now built only if SELinux support is enabled.
* pam_pwhistory: implemented reliable usernames handling when remembering
  passwords.
* pam_shells: changed to allow shell entries with absolute paths only.
* pam_succeed_if: fixed treating empty strings as numerical value 0.
* pam_unix: added support of disabled password aging.
* pam_unix: synchronized password aging with shadow.
* pam_unix: implemented string to number conversions validation.
* pam_unix: fixed truncation of very long user names.
* pam_unix: corrected rounds retrieval for configured encryption method.
* pam_unix: implemented reliable usernames handling when remembering passwords.
* pam_unix: changed to always run the helper to obtain shadow password entries.
* pam_unix: unix_update helper binary is now built only if SELinux support
  is enabled.
* pam_unix: added audit support to unix_update helper.
* pam_userdb: added gdbm support.
* Multiple minor bug fixes, portability fixes, documentation improvements,
  and translation updates.

Linux-PAM release 1.5.3

* configure: added options to configure stylesheets.
* configure: added --enable-logind option to use logind instead of utmp
  in pam_issue and pam_timestamp.
* pam_modutil_getlogin: changed to use getlogin() from libc instead of parsing utmp.
* Added libeconf support to pam_env and pam_shells.
* Added vendor directory support to pam_access, pam_env, pam_group, pam_faillock,
  pam_limits, pam_namespace, pam_pwhistory, pam_sepermit, pam_shells, and pam_time.
* pam_limits: changed to not fail on missing config files.
* pam_pwhistory: added conf= option to specify config file location.
* pam_pwhistory: added file= option to specify password history file location.
* pam_shells: added shells.d support when libeconf and vendordir are enabled.
* Deprecated pam_lastlog: this module is no longer built by default because
  it uses utmp, wtmp, btmp and lastlog, but none of them are Y2038 safe,
  even on 64bit architectures.
  pam_lastlog will be removed in one of the next releases, consider using
  pam_lastlog2 (from https://github.com/thkukuk/lastlog2) and/or
  pam_wtmpdb (from https://github.com/thkukuk/wtmpdb) instead.
* Deprecated _pam_overwrite(), _pam_overwrite_n(), and _pam_drop_reply() macros
  provided by _pam_macros.h; the memory override performed by these macros can
  be optimized out by the compiler and therefore can no longer be relied upon.
* Multiple minor bug fixes, portability fixes, documentation improvements,
  and translation updates.

Linux-PAM release 1.5.2

* pam_exec: implemented quiet_log option.
* pam_mkhomedir: added support of HOME_MODE and UMASK from /etc/login.defs.
* pam_timestamp: changed hmac algorithm to call openssl instead of the bundled
                 sha1 implementation if selected, added option to select
                 the hash algorithm to use with HMAC.
* Added pkgconfig files for provided libraries.
* Added --with-systemdunitdir configure option to specify systemd unit
  directory.
* Added --with-misc-conv-bufsize configure option to specify the buffer size
  in libpam_misc's misc_conv() function, raised the default value for this
  parameter from 512 to 4096.
* Multiple minor bug fixes, portability fixes, documentation improvements,
  and translation updates.

Linux-PAM release 1.5.1

* pam_unix: fixed CVE-2020-27780 - authentication bypass when a user
            doesn't exist and root password is blank
* pam_faillock: added nodelay option to not set pam_fail_delay
* pam_wheel: use pam_modutil_user_in_group to check for the group membership
             with getgrouplist where it is available

Linux-PAM release 1.5.0

* Multiple minor bug fixes, portability fixes, and documentation improvements.
* Extended libpam API with pam_modutil_check_user_in_passwd function.
* configure: added --disable-unix option to disable build of pam_unix module.
* pam_faillock: changed /run/faillock/$USER permissions from 0600 to 0660.
* pam_limits: added support for nonewprivs item.
* pam_motd: read motd files with target user credentials skipping unreadable ones.
* pam_pwhistory: added a SELinux helper executable.
* pam_unix, pam_usertype: implemented avoidance of certain timing attacks.
* pam_wheel: implemented PAM_RUSER fallback for the case when getlogin fails.
* Removed deprecated pam_cracklib module, use pam_passwdqc (from passwdqc project)
  or pam_pwquality (from libpwquality project) instead.
* Removed deprecated pam_tally and pam_tally2 modules, use pam_faillock instead.
* pam_env: Reading of the user environment is deprecated and will be removed
	   at some point in the future.
* libpam: pam_modutil_drop_priv() now correctly sets the target user's
          supplementary groups, allowing pam_motd to filter messages accordingly

Linux-PAM release 1.4.0

* Multiple minor bug fixes and documentation improvements
* Fixed grammar of messages printed via pam_prompt
* Added support for a vendor directory and libeconf
* configure: Added --enable-Werror option to enable -Werror build
* configure: Allowed disabling documentation through --disable-doc
* pam_get_authtok_verify: Avoid duplicate password verification
* pam_cracklib: Fixed parsing of options without arguments
* pam_env: Changed the default to not read the user .pam_environment file
* pam_exec: Require a user name to be specified before the command is executed
* pam_faillock: New module for locking after multiple auth failures
* pam_group, pam_time: Fixed logical error with multiple ! operators
* pam_keyinit: In pam_sm_setcred do the same as in pam_sm_open_session
* pam_lastlog: Do not log info about failed login if the session was opened
	       with PAM_SILENT flag
* pam_lastlog: Limit lastlog file use by LASTLOG_UID_MAX option in login.defs
* pam_lastlog: With 'unlimited' option prevent SIGXFSZ due to reduced 'fsize'
	       limit
* pam_mkhomedir: Fixed return value when the user is unknown
* pam_motd: Export MOTD_SHOWN=pam after showing MOTD
* pam_motd: Support multiple motd paths specified, with filename overrides
* pam_namespace: Added a systemd service, which creates the namespaced
		 instance parent directories during boot
* pam_namespace: Support for noexec, nosuid and nodev flags for tmpfs mounts
* pam_selinux: Check unknown object classes or permissions in current policy
* pam_selinux: Fall back to log to syslog if audit logging fails
* pam_setquota: New module to set or modify disk quotas on session start
* pam_shells: Recognize /bin/sh as the default shell
* pam_succeed_if: Fixed potential override of the default prompt
* pam_succeed_if: Support lists in group membership checks
* pam_time: Added conffile= option to specify an alternative configuration file
* pam_tty_audit: If kernel audit is disabled return PAM_IGNORE
* pam_umask: Added new 'nousergroups' module argument and allowed specifying
	     the default for usergroups at build-time
* pam_unix: Added 'nullresetok' option to allow resetting blank passwords
* pam_unix: Report unusable hashes found by checksalt to syslog
* pam_unix: Return PAM_AUTHINFO_UNAVAIL when shadow entry is unavailable
* pam_unix: Support for (gost-)yescrypt hashing methods
* pam_unix: Use bcrypt b-variant when it bcrypt is chosen
* pam_usertype: New module to tell if uid is in login.defs ranges
* Fixed and documented possible values returned by pam_get_user()
* Added new API call pam_start_confdir() for special applications that
  cannot use the system-default PAM configuration paths and need to
  explicitly specify another path
* Deprecated pam_cracklib: this module is no longer built by default and will
  be removed in the next release, use pam_passwdqc (from passwdqc project)
  or pam_pwquality (from libpwquality project) instead
* Deprecated pam_tally and pam_tally2: these modules are no longer built
  by default and will be removed in the next release, use pam_faillock instead