http://lists.gnu.org/archive/html/bug-bash/2006-01/msg00054.html
http://bugs.gentoo.org/118257

Date: Fri, 13 Jan 2006 17:11:10 +0000
From: Tim Waugh <twaugh@redhat.com>
To: bug-bash@gnu.org
Subject: [patch] fix 'exec -l /bin/bash'

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: i386-redhat-linux-gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-redhat-linux-gnu' -DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables
uname output: Linux gene.surrey.redhat.com 2.6.13-1.1597_FC5 #1 Thu Oct 6 02:13:06 EDT 2005 i686 i686 i386 GNU/Linux
Machine Type: i386-redhat-linux-gnu

Bash Version: 3.1
Patch Level: 1
Release Status: release

Description:
	If bash has argv[0] as '-/bin/bash' it does not become a login
	shell.

Repeat-By:
	exec -l /bin/bash
	shopt

Fix:

--- bash-3.1/shell.c.login	2006-01-13 16:52:14.000000000 +0000
+++ bash-3.1/shell.c	2006-01-13 16:52:15.000000000 +0000
@@ -1543,9 +1543,10 @@
      any startup files; just try to be more like /bin/sh. */
   shell_name = argv0 ? base_pathname (argv0) : PROGRAM;
 
-  if (*shell_name == '-')
+  if (argv0 && *argv0 == '-')
     {
-      shell_name++;
+      if (*shell_name == '-')
+        shell_name++;
       login_shell++;
     }
 


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