linux-kernel - Re: [PATCH] drm/radeon: fix copy of uninitialized variable back to userspace

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:   Wed, 3 Mar 2021 08:42:31 +0100
From:   Christian König <christian.koenig@....com>
To:     Colin King <colin.king@...onical.com>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Marek Olšák <marek.olsak@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/radeon: fix copy of uninitialized variable back to
 userspace

Am 03.03.21 um 01:27 schrieb Colin King:
> From: Colin Ian King <colin.king@...onical.com>
>
> Currently the ioctl command RADEON_INFO_SI_BACKEND_ENABLED_MASK can
> copy back uninitialised data in value_tmp that pointer *value points
> to. This can occur when rdev->family is less than CHIP_BONAIRE and
> less than CHIP_TAHITI.  Fix this by adding in a missing -EINVAL
> so that no invalid value is copied back to userspace.
>
> Addresses-Coverity: ("Uninitialized scalar variable)
> Cc: stable@...r.kernel.org # 3.13+
> Fixes: 439a1cfffe2c ("drm/radeon: expose render backend mask to the userspace")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Christian König <christian.koenig@....com>

Let's hope that this doesn't break UAPI.

Christian.

> ---
>   drivers/gpu/drm/radeon/radeon_kms.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index 2479d6ab7a36..58876bb4ef2a 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -518,6 +518,7 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
>   			*value = rdev->config.si.backend_enable_mask;
>   		} else {
>   			DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n");
> +			return -EINVAL;
>   		}
>   		break;
>   	case RADEON_INFO_MAX_SCLK: