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diff -uNrp -x '*~' coreutils-5.97-orig/src/su.c coreutils-5.97/src/su.c
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--- coreutils-5.97-orig/src/su.c 2006-07-13 12:14:40.000000000 +0100
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+++ coreutils-5.97/src/su.c 2006-07-13 12:24:33.000000000 +0100
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@@ -131,11 +131,15 @@
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#include "error.h"
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-/* The official name of this program (e.g., no `g' prefix). */
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+/* The official name of this program (e.g., no `g' prefix).
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+ * - Add a "-l" to the name passed to PAM if this is a login simulation
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+ */
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#ifndef RUNUSER
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#define PROGRAM_NAME "su"
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+#define PROGRAM_NAME_L "su-l"
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#else
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#define PROGRAM_NAME "runuser"
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+#define PROGRAM_NAME_L "runuser-l"
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#endif
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#ifndef AUTHORS
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@@ -310,7 +314,8 @@ correct_password (const struct passwd *p
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#ifdef USE_PAM
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struct passwd *caller;
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char *tty_name, *ttyn;
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- retval = pam_start(PROGRAM_NAME, pw->pw_name, &conv, &pamh);
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+ retval = pam_start(simulate_login ? PROGRAM_NAME_L : PROGRAM_NAME,
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+ pw->pw_name, &conv, &pamh);
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PAM_BAIL_P;
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#ifndef RUNUSER
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diff -urp coreutils-6.10-orig/doc/coreutils.info coreutils-6.10/doc/coreutils.info
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--- coreutils-6.10-orig/doc/coreutils.info 2008-01-22 00:32:44.000000000 +0100
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+++ coreutils-6.10/doc/coreutils.info 2008-01-24 17:17:04.000000000 +0100
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@@ -11006,7 +11006,8 @@ options::.
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set, even for the super-user, as described above), and set `PATH'
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to a compiled-in default value. Change to USER's home directory.
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Prepend `-' to the shell's name, intended to make it read its
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- login startup file(s).
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+ login startup file(s). When this option is given, /etc/pam.d/su-l
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+ PAM file is used instead of the default one.
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`-m'
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`-p'
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diff -urp coreutils-6.10-orig/doc/coreutils.texi coreutils-6.10/doc/coreutils.texi
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--- coreutils-6.10-orig/doc/coreutils.texi 2008-01-24 16:50:57.000000000 +0100
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+++ coreutils-6.10/doc/coreutils.texi 2008-01-24 17:12:58.000000000 +0100
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@@ -13670,7 +13670,9 @@ the exit status of @var{command} otherwi
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@command{su} allows one user to temporarily become another user. It runs a
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command (often an interactive shell) with the real and effective user
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-ID, group ID, and supplemental groups of a given @var{user}. Synopsis:
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+ID, group ID, and supplemental groups of a given @var{user}. When the -l
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+option is given, the su-l PAM file is used instead of the default su PAM file.
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+Synopsis:
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@example
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su [@var{option}]@dots{} [@var{user} [@var{arg}]@dots{}]
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