Re: [PATCH v4 2/5] kasan: Add KASAN mode kernel parameter
From: Andrey Konovalov <hidden>
Date: 2021-01-19 18:30:19
Also in:
lkml
On Mon, Jan 18, 2021 at 7:30 PM Vincenzo Frascino [off-list ref] wrote:
quoted hunk ↗ jump to hunk
--- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst@@ -162,6 +162,9 @@ particular KASAN features. - ``kasan=off`` or ``=on`` controls whether KASAN is enabled (default: ``on``). +- ``kasan.mode=sync`` or ``=async`` controls whether KASAN is configured in + synchronous or asynchronous mode of execution (default: ``sync``).
This needs to be expanded with a short explanation of the difference.
+static inline void hw_enable_tagging_mode(void)
+{
+ if (kasan_arg_mode == KASAN_ARG_MODE_ASYNC)
+ hw_enable_tagging_async();
+ else
+ hw_enable_tagging_sync();
+}It's OK to open-code this in kasan_init_hw_tags_cpu(), no need for an additional function.
quoted hunk ↗ jump to hunk
--- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h@@ -284,7 +284,8 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) #define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr)) #endif -#define hw_enable_tagging() arch_enable_tagging() +#define hw_enable_tagging_sync() arch_enable_tagging_sync() +#define hw_enable_tagging_async() arch_enable_tagging_async()
This is one of the places that conflicts with the testing patches. You'll need to: add an else case definition of hw_enable_tagging_sync(); change lib/test_kasan.c to use hw_enable_tagging_sync(). I'll later add a patch on top that forbids running the tests with the async mode. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel