Messages in this thread Patch in this message | | | Date | Thu, 13 Jan 2005 17:37:11 +0100 | From | Han Boetes <> | Subject | Re: propolice support for linux |
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Thanks for your comments! This wasn't my patch, just the closed thing to something working I could find. Here is my version.
Now all I wonder about is what the _NOVERS should become, since Arjen pointed it it `was dead,' since I don't really understand what he means with that.
Perhaps I should also add some additional comment about how little effect this extension resorts on kernel-level.
And I got two warnings about `int __guard = '\0\0\n\777';'
lib/propolice.c:15:15: warning: octal escape sequence out of range lib/propolice.c:15:15: warning: multi-character character constant
--- linux-2.6.9/lib/propolice.c.orig 2005-01-13 17:08:49.920963760 +0100 +++ linux-2.6.9/lib/propolice.c 2005-01-13 16:46:48.939783424 +0100 @@ -0,0 +1,24 @@ +/* + * Copyright 2005, Han Boetes <han@boetes.org> + * + * This code adds support for the propolice stacksmashing + * extension for gcc. + * http://www.research.ibm.com/trl/projects/security/ssp/ + * + * This source code is licensed under the GNU General Public + * License, Version 2. See the file COPYING for more details. + * + */ +#include <linux/kernel.h> +#include <linux/module.h> + +int __guard = '\0\0\n\777'; +EXPORT_SYMBOL_NOVERS(__guard); + +static const char message[] = "propolice detects %x at function %s.\n"; + +void __stack_smash_handler(int damaged, char func[]) +{ + panic(message, damaged, func); +} +EXPORT_SYMBOL_NOVERS(__stack_smash_handler); --- linux-2.6.9/lib/Makefile.orig 2005-01-13 16:47:58.564198904 +0100 +++ linux-2.6.9/lib/Makefile 2005-01-13 17:06:29.124368096 +0100 @@ -23,6 +23,8 @@ obj-$(CONFIG_GENERIC_IOMAP) += iomap.o obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/ obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/ +obj-$(CONFIG_PROPOLICE) += propolice.o + hostprogs-y := gen_crc32table clean-files := crc32table.h --- linux-2.6.9/security/Kconfig.orig 2004-10-18 23:54:39.000000000 +0200 +++ linux-2.6.9/security/Kconfig 2005-01-13 16:57:23.130371800 +0100 @@ -44,6 +44,18 @@ config SECURITY_ROOTPLUG If you are unsure how to answer this question, answer N. +config PROPOLICE + bool 'GCC ProPolice SSP build support' + help + This enables kernel building with stack-smashing protection + via the -fstack-protector GCC flag, if you have GCC build with + propolice. + + See <http://www.research.ibm.com/trl/projects/security/ssp/> for + more information about this compiler-extension. + + If you are unsure how to answer this question, answer N. + source security/selinux/Kconfig endmenu --- linux-2.6.9/Makefile.orig 2005-01-13 16:38:39.479192744 +0100 +++ linux-2.6.9/Makefile 2005-01-13 16:40:45.139089536 +0100 @@ -490,6 +490,10 @@ ifndef CONFIG_FRAME_POINTER CFLAGS += -fomit-frame-pointer endif +ifdef CONFIG_PROPOLICE +CFLAGS += -fstack-protector +endif + ifdef CONFIG_DEBUG_INFO CFLAGS += -g endif
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