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From 9e7cedda86e5356d1723e6bd0bab5e38c4fe4a34 Mon Sep 17 00:00:00 2001
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From: "Andrew G. Morgan" <morgan@kernel.org>
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Date: Sat, 27 Nov 2021 21:00:22 -0800
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Subject: [PATCH 74/74] Complete Linux-PAM compliance for forked child in su
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and login.
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As documented here:
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http://www.linux-pam.org/Linux-PAM-html/adg-interface-by-app-expected.html#adg-pam_end
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The child that is about to exec*() the user shell is supposed to pam_end()
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with PAM_DATA_SILENT. This gives the modules a last chance to do a minor
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cleanup of the module state before the user's shell is launched.
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1950187
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2033566
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Upstream: http://github.com/util-linux/util-linux/commit/4660286e9cdff6d95b49295674b96f83af10ea36
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Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
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---
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login-utils/login.c | 3 +++
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login-utils/su-common.c | 3 +++
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2 files changed, 6 insertions(+)
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diff --git a/login-utils/login.c b/login-utils/login.c
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index 8c9e43292..9f50fe03b 100644
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--- a/login-utils/login.c
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+++ b/login-utils/login.c
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@@ -1370,6 +1370,9 @@ int main(int argc, char **argv)
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childArgv[childArgc++] = NULL;
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+ /* http://www.linux-pam.org/Linux-PAM-html/adg-interface-by-app-expected.html#adg-pam_end */
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+ (void) pam_end(cxt.pamh, PAM_SUCCESS|PAM_DATA_SILENT);
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+
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execvp(childArgv[0], childArgv + 1);
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if (!strcmp(childArgv[0], "/bin/sh"))
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diff --git a/login-utils/su-common.c b/login-utils/su-common.c
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index c1b1a04e4..825ff1d5a 100644
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--- a/login-utils/su-common.c
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+++ b/login-utils/su-common.c
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@@ -1428,6 +1428,9 @@ int su_main(int argc, char **argv, int mode)
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if (su->simulate_login && chdir(su->pwd->pw_dir) != 0)
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warn(_("warning: cannot change directory to %s"), su->pwd->pw_dir);
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+ /* http://www.linux-pam.org/Linux-PAM-html/adg-interface-by-app-expected.html#adg-pam_end */
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+ (void) pam_end(su->pamh, PAM_SUCCESS|PAM_DATA_SILENT);
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+
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if (shell)
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run_shell(su, shell, command, argv + optind, max(0, argc - optind));
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--
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2.31.1
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