some linkage tweaking, the kernel is not linked against libssp (which

is using linux/glibc), we provide our own SSP guards leading to
kernel_panic (for now).
per default build the kernel with ld (as we need precise control how
we link it)
the libc tests are per default linked with the same compiler as
provided with $(CC)
using #include_next of gcc/clang to include the real stdint.h header
file in stdint.h stub

2 files changed, 29 insertions, 0 deletions

diff --git a/src/kernel/kernel.c b/src/kernel/kernel.c
index a472cde..be5da7c 100644
--- a/src/kernel/kernel.c
+++ b/src/kernel/kernel.c
@@ -419,4 +419,22 @@ static void print_memory_status( global_context_t *global_context )
 	
 }
 
+uintptr_t __stack_chk_guard = STACK_CHK_GUARD;
 
+__attribute__( ( noreturn ) )
+void __stack_chk_fail_local( void )
+{
+	kernel_panic( "Stack smashing detected!" );
+
+	// make gcc happy on noreturn does return
+	for( ;; );
+}
+
+__attribute__( ( noreturn ) )
+void __stack_chk_fail( void )
+{
+	kernel_panic( "Stack smashing detected!" );
+
+	// make gcc happy on noreturn does return
+	for( ;; );
+}
diff --git a/src/kernel/kernel.h b/src/kernel/kernel.h
index dc23fd6..87733c8 100644
--- a/src/kernel/kernel.h
+++ b/src/kernel/kernel.h
@@ -1,10 +1,21 @@
 #ifndef KERNEL_H
 #define KERNEL_H
 
+#include "stdint.h"
 #include "stdio.h"
 
 void kernel_main( void );
 void kernel_panic( const char *format, ... );
 void kernel_halt( void );
 
+#define STACK_CHK_GUARD 0xe2dee396
+
+extern uintptr_t __stack_chk_guard;
+
+__attribute__( ( noreturn ) )
+void __stack_chk_fail_local( void );
+
+__attribute__( ( noreturn ) )
+void __stack_chk_fail( void );
+
 #endif // KERNEL_H