linux-kernel - Re: [PATCH 1/4] kasan: mark addr_has_metadata __always

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CA+fCnZe_BYgXff6OnU+L4SJC1kbzse9VtdwUS7tQinudL7n=Jg@mail.gmail.com>
Date:   Thu, 9 Feb 2023 23:21:45 +0100
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] kasan: mark addr_has_metadata __always_inline

On Wed, Feb 8, 2023 at 5:40 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> When the compiler decides not to inline this function, objdump
> complains about incorrect UACCESS state:
>
> mm/kasan/generic.o: warning: objtool: __asan_load2+0x11: call to addr_has_metadata() with UACCESS enabled
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  mm/kasan/kasan.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index 3231314e071f..9377b0789edc 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -297,7 +297,7 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
>                 << KASAN_SHADOW_SCALE_SHIFT);
>  }
>
> -static inline bool addr_has_metadata(const void *addr)
> +static __always_inline bool addr_has_metadata(const void *addr)
>  {
>         return (kasan_reset_tag(addr) >=
>                 kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
> @@ -316,7 +316,7 @@ bool kasan_check_range(unsigned long addr, size_t size, bool write,
>
>  #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
>
> -static inline bool addr_has_metadata(const void *addr)
> +static __always_inline bool addr_has_metadata(const void *addr)
>  {
>         return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
>  }
> --
> 2.39.1
>

Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>

Thanks!