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Subject[PATCH] introduce CONFIG_BINFMT_ELF_AOUT
Willy,

I propose the attached patch (extracted from 2.4.33-ow1) for inclusion
into 2.4.34-pre. (2.6 kernels could benefit from the same change, too.)

The patch adds a new compile-time option to control the support for
"ELF binaries with a.out format interpreters or a.out libraries".
Without this patch, such support is enabled on every system that enables
the support for ELF binaries - although 99% (100%?) of systems don't
need this hybrid functionality. Moreover, this functionality poses a
security risk - as proven in practice:

http://www.isec.pl/vulnerabilities/isec-0021-uselib.txt

This uselib() vulnerability did not affect default kernel builds with
the -ow patch specifically due to separation of the unneeded/risky code
into CONFIG_BINFMT_ELF_AOUT and having this option disabled by default.
(Yes, this change in -ow patches pre-dates the discovery of the uselib()
vulnerability.)

The patch also changes CONFIG_BINFMT_AOUT to be disabled by default on
archs that had it default to enabled. The a.out support is similarly
risky and not audited/hardened with the same scrutiny that the ELF
support has received.

Thanks,

Alexander
diff -urpPX nopatch linux-2.4.33/Documentation/Configure.help linux/Documentation/Configure.help
--- linux-2.4.33/Documentation/Configure.help Sat Aug 12 08:48:38 2006
+++ linux/Documentation/Configure.help Sat Aug 12 08:51:47 2006
@@ -4690,6 +4690,12 @@ CONFIG_BINFMT_ELF
ld.so (check the file <file:Documentation/Changes> for location and
latest version).

+ELF binaries with a.out format interpreters or a.out libraries
+CONFIG_BINFMT_ELF_AOUT
+ The kernel may support ELF executables which use an a.out format
+ interpreter (dynamic linker) and/or a.out shared libraries, in
+ addition to the usual ELF-ELF setups. You shouldn't need this.
+
Kernel support for a.out binaries
CONFIG_BINFMT_AOUT
A.out (Assembler.OUTput) is a set of formats for libraries and
@@ -4703,13 +4709,11 @@ CONFIG_BINFMT_AOUT
warrant removing support. However its removal is a good idea if you
wish to ensure that absolutely none of your programs will use this
older executable format. If you don't know what to answer at this
- point then answer Y. If someone told you "You need a kernel with
+ point then answer N. If someone told you "You need a kernel with
QMAGIC support" then you'll have to say Y here. You may answer M to
compile a.out support as a module and later load the module when you
want to use a program or library in a.out format. The module will be
- called binfmt_aout.o. Saying M or N here is dangerous though,
- because some crucial programs on your system might still be in A.OUT
- format.
+ called binfmt_aout.o.

OSF/1 v4 readv/writev compatibility
CONFIG_OSF4_COMPAT
diff -urpPX nopatch linux-2.4.33/arch/alpha/config.in linux/arch/alpha/config.in
--- linux-2.4.33/arch/alpha/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/alpha/config.in Sat Aug 12 08:51:47 2006
@@ -315,6 +315,9 @@ if [ "$CONFIG_BINFMT_AOUT" != "n" ]; the
fi

bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
tristate 'Kernel support for Linux/Intel ELF binaries' CONFIG_BINFMT_EM86
source drivers/parport/Config.in
diff -urpPX nopatch linux-2.4.33/arch/alpha/defconfig linux/arch/alpha/defconfig
--- linux-2.4.33/arch/alpha/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/alpha/defconfig Sat Aug 12 08:51:47 2006
@@ -72,6 +72,7 @@ CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
# CONFIG_BINFMT_EM86 is not set

diff -urpPX nopatch linux-2.4.33/arch/arm/config.in linux/arch/arm/config.in
--- linux-2.4.33/arch/arm/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/arm/config.in Sat Aug 12 08:51:47 2006
@@ -499,6 +499,9 @@ choice 'Kernel core (/proc/kcore) format
A.OUT CONFIG_KCORE_AOUT" ELF
tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
dep_bool 'Power Management support (experimental)' CONFIG_PM $CONFIG_EXPERIMENTAL
dep_tristate 'RISC OS personality' CONFIG_ARTHUR $CONFIG_CPU_32
diff -urpPX nopatch linux-2.4.33/arch/arm/defconfig linux/arch/arm/defconfig
--- linux-2.4.33/arch/arm/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/arm/defconfig Sat Aug 12 08:51:47 2006
@@ -83,8 +83,9 @@ CONFIG_SYSCTL=y
CONFIG_NWFPE=y
CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
# CONFIG_PM is not set
# CONFIG_ARTHUR is not set
diff -urpPX nopatch linux-2.4.33/arch/cris/config.in linux/arch/cris/config.in
--- linux-2.4.33/arch/cris/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/cris/config.in Sat Aug 12 08:51:47 2006
@@ -31,6 +31,9 @@ bool 'BSD Process Accounting' CONFIG_BSD
bool 'Sysctl support' CONFIG_SYSCTL

bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi

string 'Kernel command line' CONFIG_ETRAX_CMDLINE "root=/dev/mtdblock3"

diff -urpPX nopatch linux-2.4.33/arch/cris/defconfig linux/arch/cris/defconfig
--- linux-2.4.33/arch/cris/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/cris/defconfig Sat Aug 12 08:51:47 2006
@@ -18,6 +18,7 @@ CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_SYSCTL is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_ETRAX_KGDB is not set
# CONFIG_ETRAX_WATCHDOG is not set

diff -urpPX nopatch linux-2.4.33/arch/i386/config.in linux/arch/i386/config.in
--- linux-2.4.33/arch/i386/config.in Sat Aug 12 08:48:37 2006
+++ linux/arch/i386/config.in Sat Aug 12 08:51:47 2006
@@ -329,6 +329,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi
tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'Select task to kill on out of memory condition' CONFIG_OOM_KILLER

diff -urpPX nopatch linux-2.4.33/arch/i386/defconfig linux/arch/i386/defconfig
--- linux-2.4.33/arch/i386/defconfig Wed Jan 19 17:09:25 2005
+++ linux/arch/i386/defconfig Sat Aug 12 08:51:47 2006
@@ -115,9 +115,10 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
-CONFIG_BINFMT_MISC=y
+# CONFIG_BINFMT_ELF_AOUT is not set
+# CONFIG_BINFMT_MISC is not set
# CONFIG_OOM_KILLER is not set
CONFIG_PM=y
# CONFIG_APM is not set
diff -urpPX nopatch linux-2.4.33/arch/ia64/config.in linux/arch/ia64/config.in
--- linux-2.4.33/arch/ia64/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/ia64/config.in Sat Aug 12 08:51:47 2006
@@ -124,6 +124,9 @@ bool 'System V IPC' CONFIG_SYSVIPC
bool 'BSD Process Accounting' CONFIG_BSD_PROCESS_ACCT
bool 'Sysctl support' CONFIG_SYSCTL
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC

if [ "$CONFIG_IA64_HP_SIM" = "n" ]; then
diff -urpPX nopatch linux-2.4.33/arch/ia64/defconfig linux/arch/ia64/defconfig
--- linux-2.4.33/arch/ia64/defconfig Mon Apr 4 05:42:19 2005
+++ linux/arch/ia64/defconfig Sat Aug 12 08:51:47 2006
@@ -60,6 +60,7 @@ CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
CONFIG_SYSCTL=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
CONFIG_ACPI=y
CONFIG_ACPI_EFI=y
diff -urpPX nopatch linux-2.4.33/arch/m68k/config.in linux/arch/m68k/config.in
--- linux-2.4.33/arch/m68k/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/m68k/config.in Sat Aug 12 08:51:47 2006
@@ -99,6 +99,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi
tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC

if [ "$CONFIG_AMIGA" = "y" ]; then
diff -urpPX nopatch linux-2.4.33/arch/m68k/defconfig linux/arch/m68k/defconfig
--- linux-2.4.33/arch/m68k/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/m68k/defconfig Sat Aug 12 08:51:47 2006
@@ -44,8 +44,9 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
CONFIG_ZORRO=y
# CONFIG_AMIGA_PCMCIA is not set
diff -urpPX nopatch linux-2.4.33/arch/mips/config-shared.in linux/arch/mips/config-shared.in
--- linux-2.4.33/arch/mips/config-shared.in Wed Jan 19 17:09:27 2005
+++ linux/arch/mips/config-shared.in Sat Aug 12 08:51:47 2006
@@ -845,6 +845,9 @@ define_bool CONFIG_KCORE_ELF y
define_bool CONFIG_KCORE_AOUT n
define_bool CONFIG_BINFMT_AOUT n
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
dep_bool 'Kernel support for Linux/MIPS 32-bit binary compatibility' CONFIG_MIPS32_COMPAT $CONFIG_MIPS64
dep_bool 'Kernel support for o32 binaries' CONFIG_MIPS32_O32 $CONFIG_MIPS32_COMPAT
dep_bool 'Kernel support for n32 binaries' CONFIG_MIPS32_N32 $CONFIG_MIPS32_COMPAT
diff -urpPX nopatch linux-2.4.33/arch/mips/defconfig linux/arch/mips/defconfig
--- linux-2.4.33/arch/mips/defconfig Wed Jan 19 17:09:27 2005
+++ linux/arch/mips/defconfig Sat Aug 12 08:51:47 2006
@@ -143,6 +143,7 @@ CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_MIPS32_COMPAT is not set
# CONFIG_MIPS32_O32 is not set
# CONFIG_MIPS32_N32 is not set
diff -urpPX nopatch linux-2.4.33/arch/mips/kernel/irixelf.c linux/arch/mips/kernel/irixelf.c
--- linux-2.4.33/arch/mips/kernel/irixelf.c Wed Jan 19 17:09:29 2005
+++ linux/arch/mips/kernel/irixelf.c Sat Aug 12 08:51:47 2006
@@ -8,6 +8,7 @@
* Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
*/

+#include <linux/config.h>
#include <linux/module.h>

#include <linux/fs.h>
@@ -48,7 +49,12 @@ static int irix_core_dump(long signr, st
extern int dump_fpu (elf_fpregset_t *);

static struct linux_binfmt irix_format = {
- NULL, THIS_MODULE, load_irix_binary, load_irix_library,
+ NULL, THIS_MODULE, load_irix_binary,
+#ifdef CONFIG_BINFMT_ELF_AOUT
+ load_irix_library,
+#else
+ NULL,
+#endif
irix_core_dump, PAGE_SIZE
};

@@ -794,6 +800,7 @@ out_free_ph:
goto out;
}

+#ifdef CONFIG_BINFMT_ELF_AOUT
/* This is really simpleminded and specialized - we are loading an
* a.out library that is given an ELF header.
*/
@@ -873,6 +880,7 @@ static int load_irix_library(struct file
kfree(elf_phdata);
return 0;
}
+#endif

/* Called through irix_syssgi() to map an elf image given an FD,
* a phdr ptr USER_PHDRP in userspace, and a count CNT telling how many
diff -urpPX nopatch linux-2.4.33/arch/mips64/defconfig linux/arch/mips64/defconfig
--- linux-2.4.33/arch/mips64/defconfig Wed Jan 19 17:09:30 2005
+++ linux/arch/mips64/defconfig Sat Aug 12 08:51:47 2006
@@ -147,6 +147,7 @@ CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
CONFIG_MIPS32_COMPAT=y
CONFIG_MIPS32_O32=y
# CONFIG_MIPS32_N32 is not set
diff -urpPX nopatch linux-2.4.33/arch/parisc/config.in linux/arch/parisc/config.in
--- linux-2.4.33/arch/parisc/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/parisc/config.in Sat Aug 12 08:51:47 2006
@@ -89,6 +89,9 @@ bool 'BSD Process Accounting' CONFIG_BSD
bool 'Sysctl support' CONFIG_SYSCTL
define_bool CONFIG_KCORE_ELF y
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for SOM binaries' CONFIG_BINFMT_SOM
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC

diff -urpPX nopatch linux-2.4.33/arch/parisc/defconfig linux/arch/parisc/defconfig
--- linux-2.4.33/arch/parisc/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/parisc/defconfig Sat Aug 12 08:51:47 2006
@@ -56,6 +56,7 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
CONFIG_BINFMT_SOM=y
# CONFIG_BINFMT_MISC is not set
# CONFIG_PM is not set
diff -urpPX nopatch linux-2.4.33/arch/ppc/config.in linux/arch/ppc/config.in
--- linux-2.4.33/arch/ppc/config.in Sun Aug 8 03:26:04 2004
+++ linux/arch/ppc/config.in Sat Aug 12 08:51:47 2006
@@ -384,6 +384,7 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi
define_bool CONFIG_BINFMT_ELF y
define_bool CONFIG_KERNEL_ELF y
+bool 'ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'Select task to kill on out of memory condition' CONFIG_OOM_KILLER

diff -urpPX nopatch linux-2.4.33/arch/ppc/defconfig linux/arch/ppc/defconfig
--- linux-2.4.33/arch/ppc/defconfig Wed Jan 19 17:09:36 2005
+++ linux/arch/ppc/defconfig Sat Aug 12 08:51:47 2006
@@ -59,7 +59,8 @@ CONFIG_SYSVIPC=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
CONFIG_KERNEL_ELF=y
-CONFIG_BINFMT_MISC=m
+# CONFIG_BINFMT_ELF_AOUT is not set
+# CONFIG_BINFMT_MISC is not set
# CONFIG_OOM_KILLER is not set
CONFIG_PCI_NAMES=y
CONFIG_HOTPLUG=y
diff -urpPX nopatch linux-2.4.33/arch/ppc64/config.in linux/arch/ppc64/config.in
--- linux-2.4.33/arch/ppc64/config.in Wed Feb 18 16:36:30 2004
+++ linux/arch/ppc64/config.in Sat Aug 12 08:51:47 2006
@@ -82,6 +82,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi

bool 'Kernel support for 64 bit ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi

tristate 'Kernel support for 32 bit ELF binaries' CONFIG_BINFMT_ELF32

diff -urpPX nopatch linux-2.4.33/arch/ppc64/defconfig linux/arch/ppc64/defconfig
--- linux-2.4.33/arch/ppc64/defconfig Wed Nov 17 14:54:21 2004
+++ linux/arch/ppc64/defconfig Sat Aug 12 08:51:47 2006
@@ -56,6 +56,7 @@ CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
CONFIG_BINFMT_ELF32=y
# CONFIG_BINFMT_MISC is not set
CONFIG_PCI_NAMES=y
diff -urpPX nopatch linux-2.4.33/arch/s390/config.in linux/arch/s390/config.in
--- linux-2.4.33/arch/s390/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/s390/config.in Sat Aug 12 08:51:47 2006
@@ -58,6 +58,9 @@ bool 'BSD Process Accounting' CONFIG_BSD
bool 'Sysctl support' CONFIG_SYSCTL
define_bool CONFIG_KCORE_ELF y
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'Show crashed user process info' CONFIG_PROCESS_DEBUG
bool 'Pseudo page fault support' CONFIG_PFAULT
diff -urpPX nopatch linux-2.4.33/arch/s390/defconfig linux/arch/s390/defconfig
--- linux-2.4.33/arch/s390/defconfig Wed Jan 19 17:09:37 2005
+++ linux/arch/s390/defconfig Sat Aug 12 08:51:47 2006
@@ -46,6 +46,7 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
# CONFIG_PROCESS_DEBUG is not set
CONFIG_PFAULT=y
diff -urpPX nopatch linux-2.4.33/arch/s390x/config.in linux/arch/s390x/config.in
--- linux-2.4.33/arch/s390x/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/s390x/config.in Sat Aug 12 08:51:47 2006
@@ -61,6 +61,9 @@ bool 'BSD Process Accounting' CONFIG_BSD
bool 'Sysctl support' CONFIG_SYSCTL
define_bool CONFIG_KCORE_ELF y
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'Show crashed user process info' CONFIG_PROCESS_DEBUG
bool 'Pseudo page fault support' CONFIG_PFAULT
diff -urpPX nopatch linux-2.4.33/arch/s390x/defconfig linux/arch/s390x/defconfig
--- linux-2.4.33/arch/s390x/defconfig Wed Nov 17 14:54:21 2004
+++ linux/arch/s390x/defconfig Sat Aug 12 08:51:47 2006
@@ -47,6 +47,7 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
# CONFIG_PROCESS_DEBUG is not set
CONFIG_PFAULT=y
diff -urpPX nopatch linux-2.4.33/arch/sh/config.in linux/arch/sh/config.in
--- linux-2.4.33/arch/sh/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/sh/config.in Sat Aug 12 08:51:47 2006
@@ -283,6 +283,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
A.OUT CONFIG_KCORE_AOUT" ELF
fi
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC

bool 'Select task to kill on out of memory condition' CONFIG_OOM_KILLER
diff -urpPX nopatch linux-2.4.33/arch/sh/defconfig linux/arch/sh/defconfig
--- linux-2.4.33/arch/sh/defconfig Wed Feb 18 16:36:30 2004
+++ linux/arch/sh/defconfig Sat Aug 12 08:51:47 2006
@@ -48,6 +48,7 @@ CONFIG_CF_ENABLER=y
CONFIG_KCORE_ELF=y
# CONFIG_KCORE_AOUT is not set
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set

#
diff -urpPX nopatch linux-2.4.33/arch/sparc/config.in linux/arch/sparc/config.in
--- linux-2.4.33/arch/sparc/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/sparc/config.in Sat Aug 12 08:51:47 2006
@@ -74,6 +74,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi
tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'SunOS binary emulation' CONFIG_SUNOS_EMUL
bool 'Select task to kill on out of memory condition' CONFIG_OOM_KILLER
diff -urpPX nopatch linux-2.4.33/arch/sparc/defconfig linux/arch/sparc/defconfig
--- linux-2.4.33/arch/sparc/defconfig Wed Apr 14 17:05:27 2004
+++ linux/arch/sparc/defconfig Sat Aug 12 08:51:47 2006
@@ -49,9 +49,10 @@ CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
-CONFIG_BINFMT_MISC=m
+# CONFIG_BINFMT_ELF_AOUT is not set
+# CONFIG_BINFMT_MISC is not set
CONFIG_SUNOS_EMUL=y
# CONFIG_OOM_KILLER is not set

diff -urpPX nopatch linux-2.4.33/arch/sparc64/config.in linux/arch/sparc64/config.in
--- linux-2.4.33/arch/sparc64/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/sparc64/config.in Sat Aug 12 08:51:47 2006
@@ -79,6 +79,9 @@ if [ "$CONFIG_SPARC32_COMPAT" != "n" ];
bool ' Kernel support for 32-bit (ie. SunOS) a.out binaries' CONFIG_BINFMT_AOUT32
fi
bool 'Kernel support for 64-bit ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
bool 'SunOS binary emulation' CONFIG_SUNOS_EMUL
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
diff -urpPX nopatch linux-2.4.33/arch/sparc64/defconfig linux/arch/sparc64/defconfig
--- linux-2.4.33/arch/sparc64/defconfig Wed Jan 19 17:09:38 2005
+++ linux/arch/sparc64/defconfig Sat Aug 12 08:51:47 2006
@@ -70,7 +70,8 @@ CONFIG_SPARC32_COMPAT=y
CONFIG_BINFMT_ELF32=y
# CONFIG_BINFMT_AOUT32 is not set
CONFIG_BINFMT_ELF=y
-CONFIG_BINFMT_MISC=m
+# CONFIG_BINFMT_ELF_AOUT is not set
+# CONFIG_BINFMT_MISC is not set
# CONFIG_SUNOS_EMUL is not set
CONFIG_SOLARIS_EMUL=m
# CONFIG_OOM_KILLER is not set
diff -urpPX nopatch linux-2.4.33/arch/x86_64/config.in linux/arch/x86_64/config.in
--- linux-2.4.33/arch/x86_64/config.in Wed Nov 17 14:54:21 2004
+++ linux/arch/x86_64/config.in Sat Aug 12 08:51:47 2006
@@ -118,6 +118,9 @@ if [ "$CONFIG_PROC_FS" = "y" ]; then
fi
#tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
bool 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
+if [ "$CONFIG_BINFMT_ELF" != "n" ]; then
+ bool ' ELF binaries with a.out format interpreters or a.out libraries' CONFIG_BINFMT_ELF_AOUT
+fi
tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC

bool 'Power Management support' CONFIG_PM
diff -urpPX nopatch linux-2.4.33/arch/x86_64/defconfig linux/arch/x86_64/defconfig
--- linux-2.4.33/arch/x86_64/defconfig Wed Apr 14 17:05:28 2004
+++ linux/arch/x86_64/defconfig Sat Aug 12 08:51:47 2006
@@ -67,6 +67,7 @@ CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
+# CONFIG_BINFMT_ELF_AOUT is not set
# CONFIG_BINFMT_MISC is not set
CONFIG_PM=y
CONFIG_IA32_EMULATION=y
diff -urpPX nopatch linux-2.4.33/fs/binfmt_elf.c linux/fs/binfmt_elf.c
--- linux-2.4.33/fs/binfmt_elf.c Sat Aug 12 08:48:39 2006
+++ linux/fs/binfmt_elf.c Sat Aug 12 08:51:47 2006
@@ -9,6 +9,7 @@
* Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
*/

+#include <linux/config.h>
#include <linux/module.h>

#include <linux/fs.h>
@@ -43,7 +44,9 @@
#include <linux/elf.h>

static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs);
+#ifdef CONFIG_BINFMT_ELF_AOUT
static int load_elf_library(struct file*);
+#endif
static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
extern void dump_thread(struct pt_regs *, struct user *);
@@ -73,8 +76,14 @@ static int elf_core_dump(long signr, str
#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))

-static struct linux_binfmt elf_format = {
- NULL, THIS_MODULE, load_elf_binary, load_elf_library, elf_core_dump, ELF_EXEC_PAGESIZE
+struct linux_binfmt elf_format = {
+ NULL, THIS_MODULE, load_elf_binary,
+#ifdef CONFIG_BINFMT_ELF_AOUT
+ load_elf_library,
+#else
+ NULL,
+#endif
+ elf_core_dump, ELF_EXEC_PAGESIZE
};

#define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE)
@@ -404,6 +417,7 @@ out:
return error;
}

+#ifdef CONFIG_BINFMT_ELF_AOUT
static unsigned long load_aout_interp(struct exec * interp_ex,
struct file * interpreter)
{
@@ -451,6 +465,7 @@ static unsigned long load_aout_interp(st
out:
return elf_entry;
}
+#endif

/*
* These are the functions used to load ELF style executables and shared
@@ -458,7 +473,9 @@ out:
*/

#define INTERPRETER_NONE 0
+#ifdef CONFIG_BINFMT_ELF_AOUT
#define INTERPRETER_AOUT 1
+#endif
#define INTERPRETER_ELF 2


@@ -482,7 +499,9 @@ static int load_elf_binary(struct linux_
struct elfhdr elf_ex;
struct elfhdr interp_elf_ex;
struct exec interp_ex;
+#ifdef CONFIG_BINFMT_ELF_AOUT
char passed_fileno[6];
+#endif
struct files_struct *files;

/* Get the exec-header */
@@ -612,6 +631,7 @@ static int load_elf_binary(struct linux_

/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
+#ifdef CONFIG_BINFMT_ELF_AOUT
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;

/* Now figure out which format our binary is */
@@ -619,6 +639,9 @@ static int load_elf_binary(struct linux_
(N_MAGIC(interp_ex) != ZMAGIC) &&
(N_MAGIC(interp_ex) != QMAGIC))
interpreter_type = INTERPRETER_ELF;
+#else
+ interpreter_type = INTERPRETER_ELF;
+#endif

if (memcmp(interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
interpreter_type &= ~INTERPRETER_ELF;
@@ -627,6 +650,7 @@ static int load_elf_binary(struct linux_
if (!interpreter_type)
goto out_free_dentry;

+#ifdef CONFIG_BINFMT_ELF_AOUT
/* Make sure only one type was selected */
if ((interpreter_type & INTERPRETER_ELF) &&
interpreter_type != INTERPRETER_ELF) {
@@ -634,6 +658,7 @@ static int load_elf_binary(struct linux_
// printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
interpreter_type = INTERPRETER_ELF;
}
+#endif
/* Verify the interpreter has a valid arch */
if ((interpreter_type == INTERPRETER_ELF) &&
!elf_check_arch(&interp_elf_ex))
@@ -651,6 +676,7 @@ static int load_elf_binary(struct linux_
/* OK, we are done with that, now set up the arg stuff,
and then start this sucker up */

+#ifdef CONFIG_BINFMT_ELF_AOUT
if (!bprm->sh_bang) {
char * passed_p;

@@ -666,6 +692,7 @@ static int load_elf_binary(struct linux_
}
}
}
+#endif

/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
@@ -814,10 +844,12 @@ static int load_elf_binary(struct linux_
padzero(elf_bss);

if (elf_interpreter) {
+#ifdef CONFIG_BINFMT_ELF_AOUT
if (interpreter_type == INTERPRETER_AOUT)
elf_entry = load_aout_interp(&interp_ex,
interpreter);
else
+#endif
elf_entry = load_elf_interp(&interp_elf_ex,
interpreter,
&interp_load_addr);
@@ -837,7 +869,9 @@ static int load_elf_binary(struct linux_

kfree(elf_phdata);

+#ifdef CONFIG_BINFMT_ELF_AOUT
if (interpreter_type != INTERPRETER_AOUT)
+#endif
sys_close(elf_exec_fileno);

set_binfmt(&elf_format);
@@ -851,10 +885,14 @@ static int load_elf_binary(struct linux_
&elf_ex,
load_addr, load_bias,
interp_load_addr,
+#ifdef CONFIG_BINFMT_ELF_AOUT
(interpreter_type == INTERPRETER_AOUT ? 0 : 1));
/* N.B. passed_fileno might not be initialized? */
if (interpreter_type == INTERPRETER_AOUT)
current->mm->arg_start += strlen(passed_fileno) + 1;
+#else
+ 1);
+#endif
current->mm->start_brk = current->mm->brk = elf_brk;
current->mm->end_code = end_code;
current->mm->start_code = start_code;
@@ -925,9 +963,9 @@ out_free_ph:
goto out;
}

+#ifdef CONFIG_BINFMT_ELF_AOUT
/* This is really simpleminded and specialized - we are loading an
a.out library that is given an ELF header. */
-
static int load_elf_library(struct file *file)
{
struct elf_phdr *elf_phdata;
@@ -1004,6 +1043,7 @@ out_free_ph:
out:
return error;
}
+#endif

/*
* Note that some platforms still use traditional core dumps and not
diff -urpPX nopatch linux-2.4.33/fs/exec.c linux/fs/exec.c
--- linux-2.4.33/fs/exec.c Wed Jan 19 17:10:10 2005
+++ linux/fs/exec.c Sat Aug 12 08:51:47 2006
@@ -109,6 +109,7 @@ static inline void put_binfmt(struct lin
*/
asmlinkage long sys_uselib(const char * library)
{
+#if defined(CONFIG_BINFMT_AOUT) || defined(CONFIG_BINFMT_ELF_AOUT)
struct file * file;
struct nameidata nd;
int error;
@@ -155,6 +156,9 @@ out:
exit:
path_release(&nd);
goto out;
+#else
+ return -ENOSYS;
+#endif
}

/*
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