Kees Cook 419cbf261a gen_init_cpio: avoid stack overflow when expanding ... commit 20f1de659b upstream. 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 <keescook@chromium.org> Cc: Michal Marek <mmarek@suse.cz> Cc: Brad Spengler <spender@grsecurity.net> Cc: PaX Team <pageexec@freemail.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-10-31 10:02:33 -07:00
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.gitignore	gitignore usr/initramfs_data.cpio.bz2 and usr/initramfs_data.cpio.lzma	2009-09-20 12:27:42 +02:00
Kconfig	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
Makefile	decompressors: add boot-time XZ support	2011-01-13 08:03:25 -08:00
gen_init_cpio.c	gen_init_cpio: avoid stack overflow when expanding	2012-10-31 10:02:33 -07:00
initramfs_data.S	initramfs: Really fix build break on symbol-prefixed archs	2010-12-01 13:13:21 +01:00