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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-02-13 14:40:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 21:21:42 -0800
commitbebf56a1b176c2e1c9efe44e7e6915532cc682cf (patch)
tree4b967827878142197f2b62cd0b89652873631192 /kernel
parent6301939d97d079f0d3dbe71e750f4daf5d39fc33 (diff)
downloadlinux-bebf56a1b176c2e1c9efe44e7e6915532cc682cf.tar.bz2
kasan: enable instrumentation of global variables
This feature let us to detect accesses out of bounds of global variables. This will work as for globals in kernel image, so for globals in modules. Currently this won't work for symbols in user-specified sections (e.g. __init, __read_mostly, ...) The idea of this is simple. Compiler increases each global variable by redzone size and add constructors invoking __asan_register_globals() function. Information about global variable (address, size, size with redzone ...) passed to __asan_register_globals() so we could poison variable's redzone. This patch also forces module_alloc() to return 8*PAGE_SIZE aligned address making shadow memory handling ( kasan_module_alloc()/kasan_module_free() ) more simple. Such alignment guarantees that each shadow page backing modules address space correspond to only one module_alloc() allocation. Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Konstantin Serebryany <kcc@google.com> Cc: Dmitry Chernenkov <dmitryc@google.com> Signed-off-by: Andrey Konovalov <adech.fo@gmail.com> Cc: Yuri Gribov <tetra2005@gmail.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Christoph Lameter <cl@linux.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 82dc1f899e6d..8426ad48362c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -56,6 +56,7 @@
#include <linux/async.h>
#include <linux/percpu.h>
#include <linux/kmemleak.h>
+#include <linux/kasan.h>
#include <linux/jump_label.h>
#include <linux/pfn.h>
#include <linux/bsearch.h>
@@ -1813,6 +1814,7 @@ static void unset_module_init_ro_nx(struct module *mod) { }
void __weak module_memfree(void *module_region)
{
vfree(module_region);
+ kasan_module_free(module_region);
}
void __weak module_arch_cleanup(struct module *mod)