pm24.git/usr, branch v3.19-rc7

usr/Kconfig: make initrd compression algorithm selection not expert

2014-12-13T20:42:52Z

The kernel has support for (nearly) every compression algorithm known to man, each to handle some particular microscopic niche. Unfortunately all of these always get compiled in if you want to support INITRDs, and can be only disabled when CONFIG_EXPERT is set. I don't see why I need to set EXPERT just to properly configure the initrd compression algorithms, and not always include every possible algorithm Usually the initrd is just compressed with gzip anyways, at least that's true on all distributions I use. Remove the dependencies for initrd compression on CONFIG_EXPERT. Make the various options just default y, which should be good enough to not break any previous configuration. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

initramfs: remove "compression mode" choice

2014-06-06T23:08:14Z

Commit 9ba4bcb64589 ("initramfs: read CONFIG_RD_ variables for initramfs compression") removed the users of the various INITRAMFS_COMPRESSION_* Kconfig symbols. So since v3.13 the entire "Built-in initramfs compression mode" choice is a set of knobs connected to nothing. The entire choice can safely be removed. Signed-off-by: Paul Bolle Cc: P J P Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

initramfs: read CONFIG_RD_ variables for initramfs compression

2013-11-13T03:09:26Z

When expert configuration option(CONFIG_EXPERT) is enabled, menuconfig offers a choice of compression algorithm to compress initial ramfs image; This choice is stored into CONFIG_RD_* variables. But usr/Makefile uses earlier INITRAMFS_COMPRESSION_* macros to build initial ramfs file. Since none of them is defined, resulting 'initramfs_data.cpio' file remains un-compressed. This patch updates the Makefile to use CONFIG_RD_* variables and adds support for LZ4 compression algorithm. Also updates the 'gen_initramfs_list.sh' script to check whether a selected compression command is accessible or not. And fall-back to default gzip(1) compression when it is not. Signed-off-by: P J P Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gen_init_cpio: avoid NULL pointer dereference and rework env expanding

2013-11-13T03:09:12Z

getenv() may return NULL if given environment variable does not exist which leads to NULL dereference when calling strncat. Besides that, the environment variable name was copied to a temporary env_var buffer, but this copying can be avoided by simply using the input string. Lastly, the whole loop can be greatly simplified by using the snprintf function instead of the playing with strncat. By the way, the current implementation allows a recursive variable expansion, as in: $ echo 'out ${A} out ' | A='a ${B} a' B=b /tmp/a out a b a out I'm assuming this is just a side effect and not a conscious decision (especially as this may lead to infinite loop), but I didn't want to change this behaviour without consulting. If the current behaviour is deamed incorrect, I'll be happy to send a patch without recursive processing. Signed-off-by: Michal Nazarewicz Cc: Kees Cook Cc: Jiri Kosina Cc: Jesper Juhl Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

lib: add support for LZ4-compressed kernel

2013-07-09T17:33:30Z

Add support for extracting LZ4-compressed kernel images, as well as LZ4-compressed ramdisk images in the kernel boot process. Signed-off-by: Kyungsik Lee Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Russell King Cc: Borislav Petkov Cc: Florian Fainelli Cc: Yann Collet Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gen_init_cpio: remove redundant empty line

2012-11-19T13:09:36Z

Just a completely trivial patch to remove a completely redundant blank line from usr/gen_init_cpio.c Signed-off-by: Jesper Juhl Signed-off-by: Jiri Kosina

gen_init_cpio: avoid stack overflow when expanding

2012-10-25T21:37:53Z

Fix possible overflow of the buffer used for expanding environment variables when building file list. In the extremely unlikely case of an attacker having control over the environment variables visible to gen_init_cpio, control over the contents of the file gen_init_cpio parses, and gen_init_cpio was built without compiler hardening, the attacker can gain arbitrary execution control via a stack buffer overflow. $ cat usr/crash.list file foo ${BIG}${BIG}${BIG}${BIG}${BIG}${BIG} 0755 0 0 $ BIG=$(perl -e 'print "A" x 4096;') ./usr/gen_init_cpio usr/crash.list *** buffer overflow detected ***: ./usr/gen_init_cpio terminated This also replaces the space-indenting with tabs. Patch based on existing fix extracted from grsecurity. Signed-off-by: Kees Cook Cc: Michal Marek Cc: Brad Spengler Cc: PaX Team Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kconfig: update compression algorithm info

2012-06-01T00:49:33Z

There have been new compression algorithms added without updating nearby relevant descriptive text that refers to (a) the number of compression algorithms and (b) the most recent one. Fix these inconsistencies. Signed-off-by: Randy Dunlap Reported-by: Cc: Lasse Collin Cc: "H. Peter Anvin" Cc: Markus Trippelsdorf Cc: Alain Knaff Cc: Albin Tonnerre Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

initramfs: Use KBUILD_BUILD_TIMESTAMP for generated entries

2011-04-18T12:27:52Z

gen_init_cpio gets the current time and uses it for each symlink, special file, and directory. Grab the current time once and make it possible to override it with the KBUILD_BUILD_TIMESTAMP variable for reproducible builds. Signed-off-by: Michal Marek

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

2011-01-21T01:02:05Z

The meaning of CONFIG_EMBEDDED has long since been obsoleted; the option is used to configure any non-standard kernel with a much larger scope than only small devices. This patch renames the option to CONFIG_EXPERT in init/Kconfig and fixes references to the option throughout the kernel. A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Calling the option "EXPERT" more accurately represents its intention: only expert users who understand the impact of the configuration changes they are making should enable it. Reviewed-by: Ingo Molnar Acked-by: David Woodhouse Signed-off-by: David Rientjes Cc: Greg KH Cc: "David S. Miller" Cc: Jens Axboe Cc: Arnd Bergmann Cc: Robin Holt Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds