[PATCH] charset: make u16_strnlen accessible at runtime

[Heinrich Schuchardt]

On 11/22/20 2:10 PM, Ilias Apalodimas wrote:
> commit 1fabfeef506c ("efi_loader: parameter check in GetNextVariableName()")
> introduces a check using u16_strnlen(). This code is used on EFI
> runtime variables as well, so unless we mark it as runtime, the kernel
> will crash trying to access it.
>
> Fixes: 1fabfeef506c ("efi_loader: parameter check in GetNextVariableName()")
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>

Thanks for the fix.

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

> ---
>   lib/charset.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/lib/charset.c b/lib/charset.c
> index 5686d6fb59ce..2177014ee1c5 100644
> --- a/lib/charset.c
> +++ b/lib/charset.c
> @@ -8,6 +8,7 @@
>   #include <common.h>
>   #include <charset.h>
>   #include <capitalization.h>
> +#include <efi_loader.h>
>   #include <malloc.h>
>
>   static struct capitalization_table capitalization_table[] =
> @@ -372,7 +373,7 @@ size_t u16_strlen(const void *in)
>   	return ret;
>   }
>
> -size_t u16_strnlen(const u16 *in, size_t count)
> +size_t __efi_runtime u16_strnlen(const u16 *in, size_t count)
>   {
>   	size_t i;
>   	for (i = 0; count-- && in[i]; i++);
>