On Wed, Oct 19, 2022 at 2:37 PM 'Marco Elver' via kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx> wrote:
On Thu, Oct 20, 2022 at 04:07AM +0800, youling 257 wrote:
> That is i did,i already test, remove "u64 __tmp…kmsan_unpoison_memory", no help.
> i only remove kmsan_copy_to_user, fix my issue.
Ok - does only the below work (without the reverts)?
diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h
index c4cae333deec..eb05caa8f523 100644
--- a/include/linux/kmsan-checks.h
+++ b/include/linux/kmsan-checks.h
@@ -73,8 +73,8 @@ static inline void kmsan_unpoison_memory(const void *address, size_t size)
static inline void kmsan_check_memory(const void *address, size_t size)
{
}
-static inline void kmsan_copy_to_user(void __user *to, const void *from,
- size_t to_copy, size_t left)
+static __always_inline void kmsan_copy_to_user(void __user *to, const void *from,
+ size_t to_copy, size_t left)
{
}
... because when you say only removing kmsan_copy_to_user() (from
instrument_put_user()) works, it really doesn't make any sense. The only
explanation would be if the compiler inlining is broken.
If what Marco suggests does not help, could you post the output of `nm -S vmlinux` with and without your revert so that we can see which functions were affected by the change?
Unfortunately the top results are of no help, do you have the `perf` tool available in your system?
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Alexander Potapenko
Software Engineer
Google Germany GmbH
Erika-Mann-Straße, 33
80636 München
Geschäftsführer: Paul Manicle, Liana Sebastian
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
Software Engineer
Google Germany GmbH
Erika-Mann-Straße, 33
80636 München
Geschäftsführer: Paul Manicle, Liana Sebastian
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
