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From 05188f9029780396097d5355198b8ec818852353 Mon Sep 17 00:00:00 2001
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From: Ryan Wilson <ryantimwilson@meta.com>
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Date: Tue, 12 Nov 2024 22:17:53 -0800
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Subject: [PATCH] pam_systemd: Make pam_systemd 256 backwards compatible to
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 logind 255
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---
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 src/login/pam_systemd.c | 19 +++++++++++++++++++
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 1 file changed, 19 insertions(+)
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diff --git a/src/login/pam_systemd.c b/src/login/pam_systemd.c
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index a711c89b12..7222d5a0df 100644
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--- a/src/login/pam_systemd.c
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+++ b/src/login/pam_systemd.c
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@@ -1124,6 +1124,25 @@ _public_ PAM_EXTERN int pam_sm_open_session(
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                 r = sd_bus_call(bus, m, LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply);
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         }
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+        if (r < 0 && sd_bus_error_has_name(&error, SD_BUS_ERROR_INVALID_ARGS)) {
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+                SessionContext context2 = context;
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+                context2.class = "";
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+
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+                sd_bus_error_free(&error);
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+                pam_debug_syslog(handle, debug,
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+                                 "New session classes are not available, retrying after unsetting class.");
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+
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+                m = sd_bus_message_unref(m);
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+                r = create_session_message(bus,
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+                                           handle,
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+                                           &context2,
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+                                           /* avoid_pidfd = */ true,
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+                                           &m);
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+                if (r < 0)
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+                        return pam_bus_log_create_error(handle, r);
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+
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+                r = sd_bus_call(bus, m, LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply);
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+        }
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         if (r < 0) {
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                 if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) {
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                         /* We are already in a session, don't do anything */
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-- 
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2.43.5
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