Submitted By: Robert Connolly <robert at linuxfromscratch dot org> (ashes)
Date: 2004-08-30
Initial Package Version: 2.4.27
Upstream Status: Rejected Upstream
Origin: http://www.northernsecurity.net/adamantix/diffs/2.4.20-propolice.patch
Description: Linux kernel patch for Smashing Stack Protector. This patch allows
the use of -fstack-protector durring the kernel build.
http://www.linuxfromscratch.org/hints/downloads/files/ssp.txt
http://www.linuxfromscratch.org/hlfs/

diff -Naur linux-2.4.26.orig/include/linux/kernel.h linux-2.4.26.ssp/include/linux/kernel.h
--- linux-2.4.26.orig/include/linux/kernel.h	2002-11-28 23:53:15.000000000 +0000
+++ linux-2.4.26.ssp/include/linux/kernel.h	2004-04-18 19:54:08.000000000 +0000
@@ -86,6 +86,9 @@
 extern void dev_probe_lock(void);
 extern void dev_probe_unlock(void);
 
+extern int __guard;
+extern void __stack_smash_handler(int, char []);
+
 extern int session_of_pgrp(int pgrp);
 
 asmlinkage int printk(const char * fmt, ...)
diff -Naur linux-2.4.26.orig/kernel/ksyms.c linux-2.4.26.ssp/kernel/ksyms.c
--- linux-2.4.26.orig/kernel/ksyms.c	2004-02-18 13:36:32.000000000 +0000
+++ linux-2.4.26.ssp/kernel/ksyms.c	2004-04-18 19:54:08.000000000 +0000
@@ -528,6 +528,8 @@
 EXPORT_SYMBOL(single_open);
 EXPORT_SYMBOL(single_release);
 EXPORT_SYMBOL(seq_release_private);
+EXPORT_SYMBOL_NOVERS(__guard);
+EXPORT_SYMBOL_NOVERS(__stack_smash_handler);
 
 /* Program loader interfaces */
 EXPORT_SYMBOL(setup_arg_pages);
diff -Naur linux-2.4.26.orig/lib/Makefile linux-2.4.26.ssp/lib/Makefile
--- linux-2.4.26.orig/lib/Makefile	2004-04-14 13:05:40.000000000 +0000
+++ linux-2.4.26.ssp/lib/Makefile	2004-04-18 19:54:08.000000000 +0000
@@ -12,7 +12,7 @@
 	       rbtree.o crc32.o firmware_class.o
 
 obj-y := errno.o ctype.o string.o vsprintf.o brlock.o cmdline.o \
-	 bust_spinlocks.o rbtree.o dump_stack.o
+	 bust_spinlocks.o rbtree.o dump_stack.o propolice.o
 
 obj-$(CONFIG_FW_LOADER) += firmware_class.o
 obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
diff -Naur linux-2.4.26.orig/lib/propolice.c linux-2.4.26.ssp/lib/propolice.c
--- linux-2.4.26.orig/lib/propolice.c	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.4.26.ssp/lib/propolice.c	2004-04-18 19:54:08.000000000 +0000
@@ -0,0 +1,13 @@
+ /*
+  *  linux/lib/errno.c
+  *
+  *
+  */
+ 
+ int __guard = '\0\0\n\777';
+ 
+ void __stack_smash_handler (int damaged, char func[])
+ 	 {
+	   static char *message = "propolice detects %x at function %s.\n" ;
+	   panic (message, damaged, func);
+}