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J . Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Matthias Brugger , , , , , , , Subject: [PATCH v3,02/21] v4l2: handle secure memory flags in queue setup Date: Wed, 6 Dec 2023 16:15:19 +0800 Message-ID: <20231206081538.17056-3-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231206081538.17056-1-yunfei.dong@mediatek.com> References: <20231206081538.17056-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231206_003623_534475_CE543C07 X-CRM114-Status: GOOD ( 18.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Jeffrey Kardatzke Validates the secure memory flags when setting up a queue and ensures the queue has the proper capability. Signed-off-by: Jeffrey Kardatzke Signed-off-by: Yunfei Dong --- .../media/common/videobuf2/videobuf2-core.c | 23 +++++++++++++ .../media/common/videobuf2/videobuf2-v4l2.c | 34 +++++++++++++------ 2 files changed, 46 insertions(+), 11 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 8c1df829745b..09dc030484be 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -813,6 +813,15 @@ static bool verify_coherency_flags(struct vb2_queue *q, bool non_coherent_mem) return true; } +static bool verify_secure_mem_flags(struct vb2_queue *q, bool secure_mem) +{ + if (secure_mem != q->secure_mem) { + dprintk(q, 1, "secure memory model mismatch\n"); + return false; + } + return true; +} + int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, unsigned int flags, unsigned int *count) { @@ -820,6 +829,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, unsigned int q_num_bufs = vb2_get_num_buffers(q); unsigned plane_sizes[VB2_MAX_PLANES] = { }; bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; + bool secure_mem = flags & V4L2_MEMORY_FLAG_SECURE; unsigned int i; int ret = 0; @@ -836,6 +846,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, if (*count == 0 || q_num_bufs != 0 || (q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory) || !verify_coherency_flags(q, non_coherent_mem)) { + bool no_previous_buffers = !q->num_buffers; + /* * We already have buffers allocated, so first check if they * are not in use and can be freed. @@ -854,6 +866,12 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, __vb2_queue_free(q, q_num_bufs); mutex_unlock(&q->mmap_lock); + /* + * Do not allow switching secure buffer mode. + */ + if (!no_previous_buffers && !verify_secure_mem_flags(q, secure_mem)) + return -EINVAL; + /* * In case of REQBUFS(0) return immediately without calling * driver's queue_setup() callback and allocating resources. @@ -882,6 +900,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, if (ret) return ret; set_queue_coherency(q, non_coherent_mem); + q->secure_mem = secure_mem; /* * Ask the driver how many buffers and planes per buffer it requires. @@ -986,6 +1005,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, unsigned plane_sizes[VB2_MAX_PLANES] = { }; bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; unsigned int q_num_bufs = vb2_get_num_buffers(q); + bool secure_mem = flags & V4L2_MEMORY_FLAG_SECURE; bool no_previous_buffers = !q_num_bufs; int ret = 0; @@ -1015,6 +1035,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, return ret; q->waiting_for_buffers = !q->is_output; set_queue_coherency(q, non_coherent_mem); + q->secure_mem = secure_mem; } else { if (q->memory != memory) { dprintk(q, 1, "memory model mismatch\n"); @@ -1022,6 +1043,8 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, } if (!verify_coherency_flags(q, non_coherent_mem)) return -EINVAL; + if (!verify_secure_mem_flags(q, secure_mem)) + return -EINVAL; } num_buffers = min(*count, q->max_num_buffers - q_num_bufs); diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 54d572c3b515..0a530830276c 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -686,22 +686,30 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps) *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; if (q->supports_requests) *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; + if (q->allow_secure_mem && q->io_modes & VB2_DMABUF) + *caps |= V4L2_BUF_CAP_SUPPORTS_SECURE_MEM; } -static void validate_memory_flags(struct vb2_queue *q, +static bool validate_memory_flags(struct vb2_queue *q, int memory, u32 *flags) { + if (*flags & V4L2_MEMORY_FLAG_SECURE && + (!q->allow_secure_mem || memory != V4L2_MEMORY_DMABUF)) { + return false; + } + if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { /* - * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, - * but in order to avoid bugs we zero out all bits. + * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only. */ - *flags = 0; - } else { - /* Clear all unknown flags. */ - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; + *flags &= ~V4L2_MEMORY_FLAG_NON_COHERENT; } + + /* Clear all unknown flags. */ + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_SECURE; + + return true; } int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) @@ -710,7 +718,8 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) u32 flags = req->flags; fill_buf_caps(q, &req->capabilities); - validate_memory_flags(q, req->memory, &flags); + if (!validate_memory_flags(q, req->memory, &flags)) + return -EINVAL; req->flags = flags; return ret ? ret : vb2_core_reqbufs(q, req->memory, req->flags, &req->count); @@ -752,7 +761,8 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) unsigned i; fill_buf_caps(q, &create->capabilities); - validate_memory_flags(q, create->memory, &create->flags); + if (!validate_memory_flags(q, create->memory, &create->flags)) + return -EINVAL; create->index = vb2_get_num_buffers(q); create->max_num_buffers = q->max_num_buffers; create->capabilities |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS; @@ -1007,7 +1017,8 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv, u32 flags = p->flags; fill_buf_caps(vdev->queue, &p->capabilities); - validate_memory_flags(vdev->queue, p->memory, &flags); + if (!validate_memory_flags(vdev->queue, p->memory, &flags)) + return -EINVAL; p->flags = flags; if (res) return res; @@ -1031,7 +1042,8 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv, p->index = vdev->queue->num_buffers; fill_buf_caps(vdev->queue, &p->capabilities); - validate_memory_flags(vdev->queue, p->memory, &p->flags); + if (!validate_memory_flags(vdev->queue, p->memory, &p->flags)) + return -EINVAL; /* * If count == 0, then just check if memory and type are valid. * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.