path: root/lib/Kconfig.kasan
diff options
authorAndrey Ryabinin <>2015-02-13 14:39:42 -0800
committerLinus Torvalds <>2015-02-13 21:21:41 -0800
commit0316bec22ec95ea2faca6406437b0b5950553b7c (patch)
tree6a278e1515188e738df2b04e9ada375215b3df22 /lib/Kconfig.kasan
parenta79316c6178ca419e35feef47d47f50b4e0ee9f2 (diff)
mm: slub: add kernel address sanitizer support for slub allocator
With this patch kasan will be able to catch bugs in memory allocated by slub. Initially all objects in newly allocated slab page, marked as redzone. Later, when allocation of slub object happens, requested by caller number of bytes marked as accessible, and the rest of the object (including slub's metadata) marked as redzone (inaccessible). We also mark object as accessible if ksize was called for this object. There is some places in kernel where ksize function is called to inquire size of really allocated area. Such callers could validly access whole allocated memory, so it should be marked as accessible. Code in slub.c and slab_common.c files could validly access to object's metadata, so instrumentation for this files are disabled. Signed-off-by: Andrey Ryabinin <> Signed-off-by: Dmitry Chernenkov <> Cc: Dmitry Vyukov <> Cc: Konstantin Serebryany <> Signed-off-by: Andrey Konovalov <> Cc: Yuri Gribov <> Cc: Konstantin Khlebnikov <> Cc: Sasha Levin <> Cc: Christoph Lameter <> Cc: Joonsoo Kim <> Cc: Dave Hansen <> Cc: Andi Kleen <> Cc: Ingo Molnar <> Cc: Thomas Gleixner <> Cc: "H. Peter Anvin" <> Cc: Christoph Lameter <> Cc: Pekka Enberg <> Cc: David Rientjes <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'lib/Kconfig.kasan')
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 0052b1b9aadd..a11ac0234452 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -5,6 +5,7 @@ if HAVE_ARCH_KASAN
config KASAN
bool "KASan: runtime memory debugger"
+ depends on SLUB_DEBUG
Enables kernel address sanitizer - runtime memory debugger,
designed to find out-of-bounds accesses and use-after-free bugs.