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authorAndrey Konovalov <andreyknvl@google.com>2023-12-21 23:04:49 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 22:58:45 +0300
commit58ee788cb23738abd57d6327d0b5096df5a53d31 (patch)
treea7a05b6a5170f8dd56d047cbec0756e255f052ae /mm/kasan
parent99f3fe416c71aa3d5aba69174c274309ededfd42 (diff)
downloadlinux-58ee788cb23738abd57d6327d0b5096df5a53d31.tar.xz
kasan: respect CONFIG_KASAN_VMALLOC for kasan_flag_vmalloc
Never enable the kasan_flag_vmalloc static branch unless CONFIG_KASAN_VMALLOC is enabled. This does not fix any observable bugs (vmalloc annotations for the HW_TAGS mode are no-op with CONFIG_KASAN_VMALLOC disabled) but rather just cleans up the code. Link: https://lkml.kernel.org/r/3e5c933c8f6b59bd587efb05c407964be951772c.1703188911.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/hw_tags.c7
-rw-r--r--mm/kasan/kasan.h1
2 files changed, 8 insertions, 0 deletions
diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index 06141bbc1e51..80f11a3eccd5 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -57,7 +57,11 @@ enum kasan_mode kasan_mode __ro_after_init;
EXPORT_SYMBOL_GPL(kasan_mode);
/* Whether to enable vmalloc tagging. */
+#ifdef CONFIG_KASAN_VMALLOC
DEFINE_STATIC_KEY_TRUE(kasan_flag_vmalloc);
+#else
+DEFINE_STATIC_KEY_FALSE(kasan_flag_vmalloc);
+#endif
#define PAGE_ALLOC_SAMPLE_DEFAULT 1
#define PAGE_ALLOC_SAMPLE_ORDER_DEFAULT 3
@@ -119,6 +123,9 @@ static int __init early_kasan_flag_vmalloc(char *arg)
if (!arg)
return -EINVAL;
+ if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
+ return 0;
+
if (!strcmp(arg, "off"))
kasan_arg_vmalloc = KASAN_ARG_VMALLOC_OFF;
else if (!strcmp(arg, "on"))
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 5fbcc1b805bc..dee105ba32dd 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -49,6 +49,7 @@ DECLARE_PER_CPU(long, kasan_page_alloc_skip);
static inline bool kasan_vmalloc_enabled(void)
{
+ /* Static branch is never enabled with CONFIG_KASAN_VMALLOC disabled. */
return static_branch_likely(&kasan_flag_vmalloc);
}