From: Maxime Coquelin <maxime.coquelin@redhat.com> To: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, elic@nvidia.com, guanjun@linux.alibaba.com, parav@nvidia.com, gautam.dawar@xilinx.com, dan.carpenter@oracle.com, xieyongji@bytedance.com, jasowang@redhat.com, mst@redhat.com Cc: gregkh@linuxfoundation.org, Maxime Coquelin <maxime.coquelin@redhat.com>, stable@vger.kernel.org Subject: [PATCH v3] vduse: prevent uninitialized memory accesses Date: Wed, 31 Aug 2022 17:49:23 +0200 [thread overview] Message-ID: <20220831154923.97809-1-maxime.coquelin@redhat.com> (raw) If the VDUSE application provides a smaller config space than the driver expects, the driver may use uninitialized memory from the stack. This patch prevents it by initializing the buffer passed by the driver to store the config value. This fix addresses CVE-2022-2308. Cc: stable@vger.kernel.org # v5.15+ Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace") Reviewed-by: Xie Yongji <xieyongji@bytedance.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com> --- drivers/vdpa/vdpa_user/vduse_dev.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 41c0b29739f1..35dceee3ed56 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -673,10 +673,15 @@ static void vduse_vdpa_get_config(struct vdpa_device *vdpa, unsigned int offset, { struct vduse_dev *dev = vdpa_to_vduse(vdpa); - if (offset > dev->config_size || - len > dev->config_size - offset) + /* Initialize the buffer in case of partial copy. */ + memset(buf, 0, len); + + if (offset > dev->config_size) return; + if (len > dev->config_size - offset) + len = dev->config_size - offset; + memcpy(buf, dev->config + offset, len); } -- 2.37.2
WARNING: multiple messages have this Message-ID (diff)
From: Maxime Coquelin <maxime.coquelin@redhat.com> To: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, elic@nvidia.com, guanjun@linux.alibaba.com, parav@nvidia.com, gautam.dawar@xilinx.com, dan.carpenter@oracle.com, xieyongji@bytedance.com, jasowang@redhat.com, mst@redhat.com Cc: gregkh@linuxfoundation.org, Maxime Coquelin <maxime.coquelin@redhat.com>, stable@vger.kernel.org Subject: [PATCH v3] vduse: prevent uninitialized memory accesses Date: Wed, 31 Aug 2022 17:49:23 +0200 [thread overview] Message-ID: <20220831154923.97809-1-maxime.coquelin@redhat.com> (raw) If the VDUSE application provides a smaller config space than the driver expects, the driver may use uninitialized memory from the stack. This patch prevents it by initializing the buffer passed by the driver to store the config value. This fix addresses CVE-2022-2308. Cc: stable@vger.kernel.org # v5.15+ Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace") Reviewed-by: Xie Yongji <xieyongji@bytedance.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com> --- drivers/vdpa/vdpa_user/vduse_dev.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 41c0b29739f1..35dceee3ed56 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -673,10 +673,15 @@ static void vduse_vdpa_get_config(struct vdpa_device *vdpa, unsigned int offset, { struct vduse_dev *dev = vdpa_to_vduse(vdpa); - if (offset > dev->config_size || - len > dev->config_size - offset) + /* Initialize the buffer in case of partial copy. */ + memset(buf, 0, len); + + if (offset > dev->config_size) return; + if (len > dev->config_size - offset) + len = dev->config_size - offset; + memcpy(buf, dev->config + offset, len); } -- 2.37.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next reply other threads:[~2022-08-31 15:49 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-08-31 15:49 Maxime Coquelin [this message] 2022-08-31 15:49 ` [PATCH v3] vduse: prevent uninitialized memory accesses Maxime Coquelin 2022-08-31 16:57 ` Chaitanya Kulkarni
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