linux-kernel - Re: [PATCH] kasan: use %zd format for printing size

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Date:   Fri, 3 Feb 2023 22:27:09 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: use %zd format for printing size_t



On 1/31/23 23:13, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The size_t type depends on the architecture, so %lu does not work
> on most 32-bit ones:
> 
> In file included from include/kunit/assert.h:13,
>                  from include/kunit/test.h:12,
>                  from mm/kasan/report.c:12:
> mm/kasan/report.c: In function 'describe_object_addr':
> include/linux/kern_levels.h:5:25: error: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
> mm/kasan/report.c:270:9: note: in expansion of macro 'pr_err'
>   270 |         pr_err("The buggy address is located %d bytes %s of\n"
>       |         ^~~~~~
> 
> Fixes: 0e301731f558 ("kasan: infer allocation size by scanning metadata")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  mm/kasan/report.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index e0492124e90a..89078f912827 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -268,7 +268,7 @@ static void describe_object_addr(const void *addr, struct kasan_report_info *inf
>  	}
>  
>  	pr_err("The buggy address is located %d bytes %s of\n"
> -	       " %s%lu-byte region [%px, %px)\n",
> +	       " %s%zu-byte region [%px, %px)\n",
>  	       rel_bytes, rel_type, region_state, info->alloc_size,
>  	       (void *)object_addr, (void *)(object_addr + info->alloc_size));
>  }

-- 
~Randy