linux-kernel - Re: [PATCH v2 1/2] platform/chrome: cros_ec

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

Date:   Thu, 12 Aug 2021 13:57:58 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH v2 1/2] platform/chrome: cros_ec_proto: Update feature check

Friendly ping.

On Tue, Aug 3, 2021 at 10:36 AM Prashant Malani <pmalani@...omium.org> wrote:
>
> EC feature flags now require more than 32 bits to be represented. In
> order to make cros_ec_check_features() usable for more recent features,
> update it to account for the extra 32 bits of features.
>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> ---
> Changes in v2:
> - No changes.
>
>  drivers/platform/chrome/cros_ec_proto.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index a7404d69b2d3..772edad80593 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -813,6 +813,7 @@ EXPORT_SYMBOL(cros_ec_get_host_event);
>  int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
>  {
>         struct cros_ec_command *msg;
> +       u32 mask;
>         int ret;
>
>         if (ec->features[0] == -1U && ec->features[1] == -1U) {
> @@ -839,7 +840,12 @@ int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
>                 kfree(msg);
>         }
>
> -       return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
> +       if (feature >= 32)
> +               mask = EC_FEATURE_MASK_1(feature);
> +       else
> +               mask = EC_FEATURE_MASK_0(feature);
> +
> +       return ec->features[feature / 32] & mask;
>  }
>  EXPORT_SYMBOL_GPL(cros_ec_check_features);
>
> --
> 2.32.0.554.ge1b32706d8-goog
>