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kasan: respect CONFIG_KASAN_VMALLOC for kasan_flag_vmalloc

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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>
This commit is contained in:
Andrey Konovalov 2023-12-21 21:04:49 +01:00 committed by Andrew Morton
parent 99f3fe416c
commit 58ee788cb2
2 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
mm/kasan/hw_tags.c
View File

@ -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"))

1
mm/kasan/kasan.h
View File

@ -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);
}