[linux-2.6-block.git] / fs / Kconfig.binfmt

# SPDX-License-Identifier: GPL-2.0-only

menu "Executable file formats"

config BINFMT_ELF
	bool "Kernel support for ELF binaries"
	depends on MMU
	select ELFCORE
	default y
	help
	  ELF (Executable and Linkable Format) is a format for libraries and
	  executables used across different architectures and operating
	  systems. Saying Y here will enable your kernel to run ELF binaries
	  and enlarge it by about 13 KB. ELF support under Linux has now all
	  but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
	  because it is portable (this does *not* mean that you will be able
	  to run executables from different architectures or operating systems
	  however) and makes building run-time libraries very easy. Many new
	  executables are distributed solely in ELF format. You definitely
	  want to say Y here.

	  Information about ELF is contained in the ELF HOWTO available from
	  <http://www.tldp.org/docs.html#howto>.

	  If you find that after upgrading from Linux kernel 1.2 and saying Y
	  here, you still can't run any ELF binaries (they just crash), then
	  you'll have to install the newest ELF runtime libraries, including
	  ld.so (check the file <file:Documentation/Changes> for location and
	  latest version).

config COMPAT_BINFMT_ELF
	def_bool y
	depends on COMPAT && BINFMT_ELF
	select ELFCORE

config ARCH_BINFMT_ELF_STATE
	bool

config ARCH_BINFMT_ELF_EXTRA_PHDRS
	bool

config ARCH_HAVE_ELF_PROT
	bool

config ARCH_USE_GNU_PROPERTY
	bool

config BINFMT_ELF_FDPIC
	bool "Kernel support for FDPIC ELF binaries"
	default y if !BINFMT_ELF
	depends on (ARM || (SUPERH && !MMU))
	select ELFCORE
	help
	  ELF FDPIC binaries are based on ELF, but allow the individual load
	  segments of a binary to be located in memory independently of each
	  other. This makes this format ideal for use in environments where no
	  MMU is available as it still permits text segments to be shared,
	  even if data segments are not.

	  It is also possible to run FDPIC ELF binaries on MMU linux also.

config ELFCORE
	bool
	help
	  This option enables kernel/elfcore.o.

config CORE_DUMP_DEFAULT_ELF_HEADERS
	bool "Write ELF core dumps with partial segments"
	default y
	depends on BINFMT_ELF && ELF_CORE
	help
	  ELF core dump files describe each memory mapping of the crashed
	  process, and can contain or omit the memory contents of each one.
	  The contents of an unmodified text mapping are omitted by default.

	  For an unmodified text mapping of an ELF object, including just
	  the first page of the file in a core dump makes it possible to
	  identify the build ID bits in the file, without paying the i/o
	  cost and disk space to dump all the text.  However, versions of
	  GDB before 6.7 are confused by ELF core dump files in this format.

	  The core dump behavior can be controlled per process using
	  the /proc/PID/coredump_filter pseudo-file; this setting is
	  inherited.  See Documentation/filesystems/proc.rst for details.

	  This config option changes the default setting of coredump_filter
	  seen at boot time.  If unsure, say Y.

config BINFMT_SCRIPT
	tristate "Kernel support for scripts starting with #!"
	default y
	help
	  Say Y here if you want to execute interpreted scripts starting with
	  #! followed by the path to an interpreter.

	  You can build this support as a module; however, until that module
	  gets loaded, you cannot run scripts.  Thus, if you want to load this
	  module from an initramfs, the portion of the initramfs before loading
	  this module must consist of compiled binaries only.

	  Most systems will not boot if you say M or N here.  If unsure, say Y.

config ARCH_HAS_BINFMT_FLAT
	bool

config BINFMT_FLAT
	bool "Kernel support for flat binaries"
	depends on ARCH_HAS_BINFMT_FLAT
	help
	  Support uClinux FLAT format binaries.

config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
	bool

config BINFMT_FLAT_OLD_ALWAYS_RAM
	bool

config BINFMT_FLAT_NO_DATA_START_OFFSET
	bool

config BINFMT_FLAT_OLD
	bool "Enable support for very old legacy flat binaries"
	depends on BINFMT_FLAT
	help
	  Support decade old uClinux FLAT format binaries.  Unless you know
	  you have some of those say N here.

config BINFMT_ZFLAT
	bool "Enable ZFLAT support"
	depends on BINFMT_FLAT
	select ZLIB_INFLATE
	help
	  Support FLAT format compressed binaries

config BINFMT_SHARED_FLAT
	bool "Enable shared FLAT support"
	depends on BINFMT_FLAT
	help
	  Support FLAT shared libraries

config HAVE_AOUT
       def_bool n

config BINFMT_AOUT
	tristate "Kernel support for a.out and ECOFF binaries"
	depends on HAVE_AOUT
	help
	  A.out (Assembler.OUTput) is a set of formats for libraries and
	  executables used in the earliest versions of UNIX.  Linux used
	  the a.out formats QMAGIC and ZMAGIC until they were replaced
	  with the ELF format.

	  The conversion to ELF started in 1995.  This option is primarily
	  provided for historical interest and for the benefit of those
	  who need to run binaries from that era.

	  Most people should answer N here.  If you think you may have
	  occasional use for this format, enable module support above
	  and answer M here to compile this support as a module called
	  binfmt_aout.

	  If any crucial components of your system (such as /sbin/init
	  or /lib/ld.so) are still in a.out format, you will have to
	  say Y here.

config OSF4_COMPAT
	bool "OSF/1 v4 readv/writev compatibility"
	depends on ALPHA && BINFMT_AOUT
	help
	  Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
	  with v4 shared libraries freely available from Compaq. If you're
	  going to use shared libraries from Tru64 version 5.0 or later, say N.

config BINFMT_MISC
	tristate "Kernel support for MISC binaries"
	help
	  If you say Y here, it will be possible to plug wrapper-driven binary
	  formats into the kernel. You will like this especially when you use
	  programs that need an interpreter to run like Java, Python, .NET or
	  Emacs-Lisp. It's also useful if you often run DOS executables under
	  the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
	  <http://www.tldp.org/docs.html#howto>). Once you have
	  registered such a binary class with the kernel, you can start one of
	  those programs simply by typing in its name at a shell prompt; Linux
	  will automatically feed it to the correct interpreter.

	  You can do other nice things, too. Read the file
	  <file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this
	  feature, <file:Documentation/admin-guide/java.rst> for information about how
	  to include Java support. and <file:Documentation/admin-guide/mono.rst> for
          information about how to include Mono-based .NET support.

          To use binfmt_misc, you will need to mount it:
		mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc

	  You may say M here for module support and later load the module when
	  you have use for it; the module is called binfmt_misc. If you
	  don't know what to answer at this point, say Y.

config COREDUMP
	bool "Enable core dump support" if EXPERT
	default y
	help
	  This option enables support for performing core dumps. You almost
	  certainly want to say Y here. Not necessary on systems that never
	  need debugging or only ever run flawless code.

endmenu
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
006477f4 CH	2
	3	menu "Executable file formats"
	4
1da177e4 LT	5	config BINFMT_ELF
1da177e4 LT	6	bool "Kernel support for ELF binaries"
a687a533	7	depends on MMU
f43edca7	8	select ELFCORE
1da177e4	9	default y
a7f7f624	10	help
1da177e4 LT	11	ELF (Executable and Linkable Format) is a format for libraries and
	12	executables used across different architectures and operating
	13	systems. Saying Y here will enable your kernel to run ELF binaries
	14	and enlarge it by about 13 KB. ELF support under Linux has now all
	15	but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
	16	because it is portable (this does not mean that you will be able
	17	to run executables from different architectures or operating systems
	18	however) and makes building run-time libraries very easy. Many new
	19	executables are distributed solely in ELF format. You definitely
	20	want to say Y here.
	21
	22	Information about ELF is contained in the ELF HOWTO available from
	23	<http://www.tldp.org/docs.html#howto>.
	24
	25	If you find that after upgrading from Linux kernel 1.2 and saying Y
	26	here, you still can't run any ELF binaries (they just crash), then
	27	you'll have to install the newest ELF runtime libraries, including
	28	ld.so (check the file <file:Documentation/Changes> for location and
	29	latest version).
	30
b9d36d5d	31	config COMPAT_BINFMT_ELF
41026c34	32	def_bool y
4cea5ceb	33	depends on COMPAT && BINFMT_ELF
f43edca7	34	select ELFCORE
b9d36d5d	35
774c105e PB	36	config ARCH_BINFMT_ELF_STATE
	37	bool
	38
b62a8486 CM	39	config ARCH_BINFMT_ELF_EXTRA_PHDRS
	40	bool
	41
fe0f6766 DM	42	config ARCH_HAVE_ELF_PROT
	43	bool
	44
db751e30 DM	45	config ARCH_USE_GNU_PROPERTY
	46	bool
	47
1da177e4 LT	48	config BINFMT_ELF_FDPIC
1da177e4 LT	49	bool "Kernel support for FDPIC ELF binaries"
382e67ae	50	default y if !BINFMT_ELF
a579fcfa	51	depends on (ARM \|\| (SUPERH && !MMU))
f43edca7	52	select ELFCORE
1da177e4 LT	53	help
	54	ELF FDPIC binaries are based on ELF, but allow the individual load
	55	segments of a binary to be located in memory independently of each
	56	other. This makes this format ideal for use in environments where no
	57	MMU is available as it still permits text segments to be shared,
	58	even if data segments are not.
	59
	60	It is also possible to run FDPIC ELF binaries on MMU linux also.
	61
f43edca7 RB	62	config ELFCORE
	63	bool
	64	help
	65	This option enables kernel/elfcore.o.
	66
656eb2cd RM	67	config CORE_DUMP_DEFAULT_ELF_HEADERS
656eb2cd RM	68	bool "Write ELF core dumps with partial segments"
89502155	69	default y
2d96d105	70	depends on BINFMT_ELF && ELF_CORE
656eb2cd RM	71	help
	72	ELF core dump files describe each memory mapping of the crashed
	73	process, and can contain or omit the memory contents of each one.
	74	The contents of an unmodified text mapping are omitted by default.
	75
	76	For an unmodified text mapping of an ELF object, including just
	77	the first page of the file in a core dump makes it possible to
	78	identify the build ID bits in the file, without paying the i/o
	79	cost and disk space to dump all the text. However, versions of
	80	GDB before 6.7 are confused by ELF core dump files in this format.
	81
	82	The core dump behavior can be controlled per process using
	83	the /proc/PID/coredump_filter pseudo-file; this setting is
0c1bc6b8	84	inherited. See Documentation/filesystems/proc.rst for details.
656eb2cd RM	85
656eb2cd RM	86	This config option changes the default setting of coredump_filter
89502155	87	seen at boot time. If unsure, say Y.
656eb2cd	88
2535e0d7 JT	89	config BINFMT_SCRIPT
	90	tristate "Kernel support for scripts starting with #!"
	91	default y
	92	help
	93	Say Y here if you want to execute interpreted scripts starting with
	94	#! followed by the path to an interpreter.
	95
	96	You can build this support as a module; however, until that module
	97	gets loaded, you cannot run scripts. Thus, if you want to load this
	98	module from an initramfs, the portion of the initramfs before loading
	99	this module must consist of compiled binaries only.
	100
	101	Most systems will not boot if you say M or N here. If unsure, say Y.
	102
aef0f78e CH	103	config ARCH_HAS_BINFMT_FLAT
	104	bool
	105
1da177e4	106	config BINFMT_FLAT
3202e181	107	bool "Kernel support for flat binaries"
aef0f78e	108	depends on ARCH_HAS_BINFMT_FLAT
1da177e4 LT	109	help
	110	Support uClinux FLAT format binaries.
	111
bdd15a28 CH	112	config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
	113	bool
	114
1d52dca1 CH	115	config BINFMT_FLAT_OLD_ALWAYS_RAM
	116	bool
	117
04d82a6d DLM	118	config BINFMT_FLAT_NO_DATA_START_OFFSET
	119	bool
	120
cf9a566c CH	121	config BINFMT_FLAT_OLD
	122	bool "Enable support for very old legacy flat binaries"
	123	depends on BINFMT_FLAT
	124	help
	125	Support decade old uClinux FLAT format binaries. Unless you know
	126	you have some of those say N here.
	127
1da177e4 LT	128	config BINFMT_ZFLAT
	129	bool "Enable ZFLAT support"
	130	depends on BINFMT_FLAT
	131	select ZLIB_INFLATE
	132	help
	133	Support FLAT format compressed binaries
	134
	135	config BINFMT_SHARED_FLAT
	136	bool "Enable shared FLAT support"
	137	depends on BINFMT_FLAT
	138	help
	139	Support FLAT shared libraries
	140
e17c6d56 DW	141	config HAVE_AOUT
	142	def_bool n
	143
1da177e4 LT	144	config BINFMT_AOUT
1da177e4 LT	145	tristate "Kernel support for a.out and ECOFF binaries"
e17c6d56	146	depends on HAVE_AOUT
a7f7f624	147	help
1da177e4 LT	148	A.out (Assembler.OUTput) is a set of formats for libraries and
	149	executables used in the earliest versions of UNIX. Linux used
	150	the a.out formats QMAGIC and ZMAGIC until they were replaced
	151	with the ELF format.
	152
	153	The conversion to ELF started in 1995. This option is primarily
	154	provided for historical interest and for the benefit of those
	155	who need to run binaries from that era.
	156
	157	Most people should answer N here. If you think you may have
	158	occasional use for this format, enable module support above
	159	and answer M here to compile this support as a module called
	160	binfmt_aout.
	161
	162	If any crucial components of your system (such as /sbin/init
	163	or /lib/ld.so) are still in a.out format, you will have to
	164	say Y here.
	165
	166	config OSF4_COMPAT
	167	bool "OSF/1 v4 readv/writev compatibility"
	168	depends on ALPHA && BINFMT_AOUT
	169	help
	170	Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
	171	with v4 shared libraries freely available from Compaq. If you're
	172	going to use shared libraries from Tru64 version 5.0 or later, say N.
	173
1da177e4 LT	174	config BINFMT_MISC
1da177e4 LT	175	tristate "Kernel support for MISC binaries"
a7f7f624	176	help
1da177e4 LT	177	If you say Y here, it will be possible to plug wrapper-driven binary
	178	formats into the kernel. You will like this especially when you use
	179	programs that need an interpreter to run like Java, Python, .NET or
	180	Emacs-Lisp. It's also useful if you often run DOS executables under
	181	the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
	182	<http://www.tldp.org/docs.html#howto>). Once you have
	183	registered such a binary class with the kernel, you can start one of
	184	those programs simply by typing in its name at a shell prompt; Linux
	185	will automatically feed it to the correct interpreter.
	186
	187	You can do other nice things, too. Read the file
34962fb8	188	<file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this
8c27ceff MCC	189	feature, <file:Documentation/admin-guide/java.rst> for information about how
8c27ceff MCC	190	to include Java support. and <file:Documentation/admin-guide/mono.rst> for
1da177e4 LT	191	information about how to include Mono-based .NET support.
	192
	193	To use binfmt_misc, you will need to mount it:
	194	mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
	195
	196	You may say M here for module support and later load the module when
	197	you have use for it; the module is called binfmt_misc. If you
	198	don't know what to answer at this point, say Y.
046d662f AK	199
	200	config COREDUMP
	201	bool "Enable core dump support" if EXPERT
	202	default y
	203	help
	204	This option enables support for performing core dumps. You almost
	205	certainly want to say Y here. Not necessary on systems that never
	206	need debugging or only ever run flawless code.
006477f4 CH	207
006477f4 CH	208	endmenu