Emese Revfy 38addce8b6 gcc-plugins: Add latent_entropy plugin ... This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals. The need for very-early boot entropy tends to be very architecture or system design specific, so this plugin is more suited for those sorts of special cases. The existing kernel RNG already attempts to extract entropy from reliable runtime variation, but this plugin takes the idea to a logical extreme by permuting a global variable based on any variation in code execution (e.g. a different value (and permutation function) is used to permute the global based on loop count, case statement, if/then/else branching, etc). To do this, the plugin starts by inserting a local variable in every marked function. The plugin then adds logic so that the value of this variable is modified by randomly chosen operations (add, xor and rol) and random values (gcc generates separate static values for each location at compile time and also injects the stack pointer at runtime). The resulting value depends on the control flow path (e.g., loops and branches taken). Before the function returns, the plugin mixes this local variable into the latent_entropy global variable. The value of this global variable is added to the kernel entropy pool in do_one_initcall() and _do_fork(), though it does not credit any bytes of entropy to the pool; the contents of the global are just used to mix the pool. Additionally, the plugin can pre-initialize arrays with build-time random contents, so that two different kernel builds running on identical hardware will not have the same starting values. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message and code comments] Signed-off-by: Kees Cook <keescook@chromium.org>		2016-10-10 14:51:44 -07:00
..
basic	scripts: Fix size mismatch of kexec_purgatory_size	2016-07-22 14:05:40 +02:00
coccinelle	scripts/coccinelle: require coccinelle >= 1.0.4 on device_node_continue.cocci	2016-07-22 12:13:39 +02:00
dtc	scripts/dtc: dt_to_config - kernel config options for a devicetree	2016-07-22 14:48:16 -05:00
gcc-plugins	gcc-plugins: Add latent_entropy plugin	2016-10-10 14:51:44 -07:00
gdb	Revert "scripts/gdb: add a Radix Tree Parser"	2016-07-15 14:54:27 +09:00
genksyms	scripts: genksyms: fix resource leak	2016-04-20 09:24:49 +02:00
kconfig	Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-05-26 22:27:09 -07:00
ksymoops
mod	staging: fsl-mc: add support for device table matching	2016-06-26 17:14:03 -07:00
package	builddeb: Skip gcc-plugins when not configured	2016-08-16 10:16:38 +02:00
selinux	selinux: explicitly declare the role "base_r"	2015-07-13 13:32:00 -04:00
tracing	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
.gitignore	KEYS: Reserve an extra certificate symbol for inserting without recompiling	2016-02-26 15:30:20 +00:00
adjust_autoksyms.sh	kbuild: fix adjust_autoksyms.sh for modules that need only one symbol	2016-05-10 17:25:29 +02:00
analyze_suspend.py	PM / tools: scripts: AnalyzeSuspend v4.2	2016-07-15 23:34:14 +02:00
asn1_compiler.c	ASN.1: fix open failure check on headername	2016-04-06 14:06:48 +01:00
bloat-o-meter	scripts/bloat-o-meter: fix percent on <1% changes	2016-07-26 16:19:19 -07:00
bootgraph.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
check_extable.sh	scripts: add check_extable.sh script.	2015-04-13 21:03:02 +09:30
check-lc_ctype.c	DocBook: Use a fixed encoding for output	2015-09-28 01:31:48 -06:00
checkincludes.pl
checkkconfigsymbols.py	checkkconfigsymbols.py: Fix typo in help message	2016-05-01 14:11:12 -07:00
checkpatch.pl	treewide: remove references to the now unnecessary DEFINE_PCI_DEVICE_TABLE	2016-09-01 17:52:01 -07:00
checkstack.pl	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-10-07 21:16:26 -04:00
checksyscalls.sh	x86/asm/entry: Move the arch/x86/syscalls/ definitions to arch/x86/entry/syscalls/	2015-06-04 07:37:37 +02:00
checkversion.pl
cleanfile
cleanpatch
coccicheck	coccicheck: refer to Documentation/coccinelle.txt and wiki	2016-07-22 12:13:39 +02:00
config	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
conmakehash.c	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
decode_stacktrace.sh	scripts/decode_stacktrace.sh: handle symbols in modules	2016-05-19 19:12:14 -07:00
decodecode
depmod.sh
diffconfig	vfs,ext2: remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX	2015-02-16 17:56:04 -08:00
docproc.c	docproc: print a comment about autogeneration for rst output	2016-05-14 09:56:56 -06:00
export_report.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
extract_xc3028.pl	[media] extract_xc3028.pl: move it to scripts/dir	2016-07-17 14:08:12 -03:00
extract-cert.c	KEYS: Remove unnecessary header #inclusions from extract-cert.c	2015-09-25 16:31:45 +01:00
extract-ikconfig	scripts/extract-ikconfig: Support LZ4-compressed images.	2015-04-15 14:01:12 +02:00
extract-module-sig.pl	KEYS: Provide a script to extract a module signature	2015-10-21 15:18:36 +01:00
extract-sys-certs.pl	KEYS: Use the symbol value for list size, updated by scripts/insert-sys-cert	2016-02-26 15:32:05 +00:00
extract-vmlinux
faddr2line	scripts/faddr2line: improve on base path filtering a bit	2016-09-19 14:49:08 -07:00
gcc-goto.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-ld	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-plugin.sh	gcc-plugins: abort builds cleanly when not supported	2016-08-08 17:49:05 -07:00
gcc-version.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-x86_32-has-stack-protector.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-x86_64-has-stack-protector.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gen_initramfs_list.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
get_dvb_firmware	[media] doc-rst: move DVB avulse docs to Documentation/media	2016-07-17 14:02:45 -03:00
get_maintainer.pl	get_maintainer: quiet noisy implicit -f vcs_file_exists checking	2016-08-26 17:39:34 -07:00
gfp-translate
headerdep.pl
headers_check.pl	headers_check: don't warn about c++ guards	2016-05-24 14:12:48 +10:00
headers_install.sh	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2014-10-14 09:22:26 +02:00
headers.sh	CRIS: Fix headers_install	2014-12-20 00:01:12 +01:00
insert-sys-cert.c	KEYS: Reserve an extra certificate symbol for inserting without recompiling	2016-02-26 15:30:20 +00:00
kallsyms.c	ARM: 8553/1: kallsyms: remove --page-offset command line option	2016-04-07 21:57:16 +01:00
Kbuild.include	kbuild: no gcc-plugins during cc-option tests	2016-08-08 17:49:05 -07:00
kernel-doc	doc-rst: kernel-doc: fix a change introduced by mistake	2016-07-23 08:04:21 -03:00
kernel-doc-xml-ref	scripts/kernel-doc: Adding cross-reference links to html documentation.	2015-08-16 22:11:16 -06:00
ld-version.sh	ld-version: Drop the 4th and 5th version components	2016-05-13 14:02:05 +02:00
Lindent	scripts/Lindent: handle missing indent gracefully	2015-09-04 16:54:41 -07:00
link-vmlinux.sh	GCC plugin infrastructure	2016-06-07 22:57:10 +02:00
Makefile	GCC plugin infrastructure	2016-06-07 22:57:10 +02:00
Makefile.asm-generic	kbuild: Remove stale asm-generic wrappers	2016-07-07 15:58:45 +02:00
Makefile.build	Shared library support	2016-06-07 22:57:10 +02:00
Makefile.clean	Shared library support	2016-06-07 22:57:10 +02:00
Makefile.dtbinst	dtbsinstall: don't move target directory out of the way	2016-01-28 11:40:32 +01:00
Makefile.extrawarn	kbuild: move -Wunused-const-variable to W=1 warning level	2016-05-11 13:05:40 +02:00
Makefile.fwinst	kbuild: include $(src)/Makefile rather than $(obj)/Makefile	2015-04-02 16:42:08 +02:00
Makefile.gcc-plugins	gcc-plugins: Add latent_entropy plugin	2016-10-10 14:51:44 -07:00
Makefile.headersinst	kbuild: collect shorthands into scripts/Kbuild.include	2014-11-26 14:36:52 +01:00
Makefile.help
Makefile.host	Shared library support	2016-06-07 22:57:10 +02:00
Makefile.kasan	arm64: add KASAN support	2015-10-12 17:46:36 +01:00
Makefile.lib	Merge branch 'akpm' (patches from Andrew)	2016-08-02 21:08:07 -04:00
Makefile.modbuiltin
Makefile.modinst	modsign: Abort modules_install when signing fails	2015-08-07 16:26:13 +01:00
Makefile.modpost	modpost: Add flag -E for making section mismatches fatal	2015-10-06 10:46:21 +10:30
Makefile.modsign	modsign: lookup lines ending in .ko in .mod files	2014-08-27 21:54:11 +09:30
Makefile.ubsan	Disable "maybe-uninitialized" warning globally	2016-07-27 13:17:41 -07:00
makelst
markup_oops.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
mkcompile_h	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
mkmakefile	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
mksysmap	mksysmap: Add h8300 local symbol pattern	2015-06-23 13:35:47 +09:00
mkuboot.sh
mkversion
module-common.lds	kernel: add support for .init_array.* constructors	2015-02-13 21:21:42 -08:00
namespace.pl	kallsyms: add support for relative offsets in kallsyms address table	2016-03-15 16:55:16 -07:00
objdiff	scripts: objdiff: support directories for the augument of record command	2014-06-10 14:59:33 +02:00
patch-kernel	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
pnmtologo.c	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
profile2linkerlist.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
prune-kernel	scripts: add "prune-kernel" script to clean up old kernel images	2016-02-09 10:09:52 -08:00
recordmcount.c	scripts/recordmcount.c: account for .softirqentry.text	2016-09-28 16:19:02 -07:00
recordmcount.h	recordmcount: Fix endianness handling bug for nop_mcount	2015-11-03 10:45:26 -05:00
recordmcount.pl	scripts/recordmcount.c: account for .softirqentry.text	2016-09-28 16:19:02 -07:00
setlocalversion	kbuild: setlocalversion: print error to STDERR	2016-06-20 17:37:45 +02:00
show_delta	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
sign-file.c	modsign: Make sign-file determine the format of the X.509 cert	2016-06-14 13:18:33 +01:00
sortextable.c	parisc: Use generic extable search and sort routines	2016-03-23 16:00:46 +01:00
sortextable.h	scripts/sortextable: suppress warning: `relocs_size' may be used uninitialized	2014-10-14 02:18:23 +02:00
spelling.txt	scripts/spelling.txt: add "fimware" misspelling	2016-05-19 19:12:14 -07:00
stackdelta	scripts: add stackdelta script	2015-08-28 17:04:40 +02:00
stackusage	scripts: add stackusage script	2015-08-28 17:04:40 +02:00
tags.sh	treewide: remove references to the now unnecessary DEFINE_PCI_DEVICE_TABLE	2016-09-01 17:52:01 -07:00
unifdef.c
ver_linux	scripts: fix typo in ver_linux	2016-02-07 23:01:45 -08:00
xen-hypercalls.sh	xen: build infrastructure for generating hypercall depending symbols	2015-03-16 14:49:13 +00:00
xz_wrap.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00