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X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB2417 Subject: Re: [Intel-gfx] [Linaro-mm-sig] [PATCH] drm-buf: Add debug option X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Intel Graphics Development , DRI Development , "moderated list:DMA BUFFER SHARING FRAMEWORK" , David Stevens , Daniel Vetter , "open list:DMA BUFFER SHARING FRAMEWORK" Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" QW0gMTUuMDEuMjEgdW0gMTQ6MjIgc2NocmllYiBEYW5pZWwgVmV0dGVyOgo+IE9uIEZyaSwgSmFu IDE1LCAyMDIxIGF0IDI6MDkgUE0gQ2hyaXN0aWFuIEvDtm5pZwo+IDxja29lbmlnLmxlaWNodHp1 bWVya2VuQGdtYWlsLmNvbT4gd3JvdGU6Cj4+IEFtIDE1LjAxLjIxIHVtIDE0OjAyIHNjaHJpZWIg 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB2417 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Am 15.01.21 um 14:22 schrieb Daniel Vetter: > On Fri, Jan 15, 2021 at 2:09 PM Christian König > wrote: >> Am 15.01.21 um 14:02 schrieb Daniel Vetter: >>> have too many people abusing the struct page they can get at but >>> really shouldn't in importers. Aside from that the backing page might >>> simply not exist (for dynamic p2p mappings) looking at it and using it >>> e.g. for mmap can also wreak the page handling of the exporter >>> completely. Importers really must go through the proper interface like >>> dma_buf_mmap for everything. >>> >>> I'm semi-tempted to enforce this for dynamic importers since those >>> really have no excuse at all to break the rules. >>> >>> Unfortuantely we can't store the right pointers somewhere safe to make >>> sure we oops on something recognizable, so best is to just wrangle >>> them a bit by flipping all the bits. At least on x86 kernel addresses >>> have all their high bits sets and the struct page array is fairly low >>> in the kernel mapping, so flipping all the bits gives us a very high >>> pointer in userspace and hence excellent chances for an invalid >>> dereference. >>> >>> v2: Add a note to the @map_dma_buf hook that exporters shouldn't do >>> fancy caching tricks, which would blow up with this address scrambling >>> trick here (Chris) >>> >>> Enable by default when CONFIG_DMA_API_DEBUG is enabled. >>> >>> Reviewed-by: Chris Wilson >>> Signed-off-by: Daniel Vetter >>> Cc: Chris Wilson >>> Cc: Sumit Semwal >>> Cc: "Christian König" >>> Cc: David Stevens >>> Cc: linux-media@vger.kernel.org >>> Cc: linaro-mm-sig@lists.linaro.org >>> --- >>> drivers/dma-buf/Kconfig | 8 +++++++ >>> drivers/dma-buf/dma-buf.c | 49 +++++++++++++++++++++++++++++++++++---- >>> include/linux/dma-buf.h | 6 +++++ >>> 3 files changed, 59 insertions(+), 4 deletions(-) >>> >>> diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig >>> index 4f8224a6ac95..4e16c71c24b7 100644 >>> --- a/drivers/dma-buf/Kconfig >>> +++ b/drivers/dma-buf/Kconfig >>> @@ -50,6 +50,14 @@ config DMABUF_MOVE_NOTIFY >>> This is marked experimental because we don't yet have a consistent >>> execution context and memory management between drivers. >>> >>> +config DMABUF_DEBUG >>> + bool "DMA-BUF debug checks" >>> + default y if DMA_API_DEBUG >>> + help >>> + This option enables additional checks for DMA-BUF importers and >>> + exporters. Specifically it validates that importers do not peek at the >>> + underlying struct page when they import a buffer. >>> + >>> config DMABUF_SELFTESTS >>> tristate "Selftests for the dma-buf interfaces" >>> default n >>> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c >>> index 1c9bd51db110..6e4725f7dfde 100644 >>> --- a/drivers/dma-buf/dma-buf.c >>> +++ b/drivers/dma-buf/dma-buf.c >>> @@ -666,6 +666,30 @@ void dma_buf_put(struct dma_buf *dmabuf) >>> } >>> EXPORT_SYMBOL_GPL(dma_buf_put); >>> >>> +static struct sg_table * __map_dma_buf(struct dma_buf_attachment *attach, >>> + enum dma_data_direction direction) >>> +{ >>> + struct sg_table *sg_table; >>> + >>> + sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); >>> + >>> +#if CONFIG_DMABUF_DEBUG >>> + if (sg_table) { >>> + int i; >>> + struct scatterlist *sg; >>> + >>> + /* To catch abuse of the underlying struct page by importers mix >>> + * up the bits, but take care to preserve the low SG_ bits to >>> + * not corrupt the sgt. The mixing is undone in __unmap_dma_buf >>> + * before passing the sgt back to the exporter. */ >>> + for_each_sgtable_sg(sg_table, sg, i) >>> + sg->page_link ^= ~0xffUL; >>> + } >>> +#endif >>> + >>> + return sg_table; >>> +} >>> + >>> /** >>> * dma_buf_dynamic_attach - Add the device to dma_buf's attachments list >>> * @dmabuf: [in] buffer to attach device to. >>> @@ -737,7 +761,7 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev, >>> goto err_unlock; >>> } >>> >>> - sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL); >>> + sgt = __map_dma_buf(attach, DMA_BIDIRECTIONAL); >>> if (!sgt) >>> sgt = ERR_PTR(-ENOMEM); >>> if (IS_ERR(sgt)) { >>> @@ -784,6 +808,23 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, >>> } >>> EXPORT_SYMBOL_GPL(dma_buf_attach); >>> >>> +static void __unmap_dma_buf(struct dma_buf_attachment *attach, >>> + struct sg_table *sg_table, >>> + enum dma_data_direction direction) >>> +{ >>> + >>> +#if CONFIG_DMABUF_DEBUG >>> + if (sg_table) { >>> + int i; >>> + struct scatterlist *sg; >>> + >>> + for_each_sgtable_sg(sg_table, sg, i) >>> + sg->page_link ^= ~0xffUL; >>> + } >>> +#endif >> Instead of duplicating this I would rather structure the code so that we >> have a helper to mangle the sgt when necessary. >> >> This can then be called from both the map() as well as the unmap() path. > Well that's why extracted the helper functions (it would be 4 copies > otherwise). It's true that it's still 2x the same operation, but > conceptually one of them mangles, the other unmangles the pointers. > It's just that with XOR mangling, that's both the same code. > Readability feels better that way to me, but I guess I can do another > tiny helper function extraction if you insist? I think it would be better to have only one. And I insist that the mangle value is only once somewhere, either use just one function or a define/constant. Christian. > -Daniel > >> Apart from that looks good to me, >> Christian. >> >>> + attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction); >>> +} >>> + >>> /** >>> * dma_buf_detach - Remove the given attachment from dmabuf's attachments list >>> * @dmabuf: [in] buffer to detach from. >>> @@ -802,7 +843,7 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) >>> if (dma_buf_is_dynamic(attach->dmabuf)) >>> dma_resv_lock(attach->dmabuf->resv, NULL); >>> >>> - dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir); >>> + __unmap_dma_buf(attach, attach->sgt, attach->dir); >>> >>> if (dma_buf_is_dynamic(attach->dmabuf)) { >>> dma_buf_unpin(attach); >>> @@ -924,7 +965,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, >>> } >>> } >>> >>> - sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); >>> + sg_table = __map_dma_buf(attach, direction); >>> if (!sg_table) >>> sg_table = ERR_PTR(-ENOMEM); >>> >>> @@ -987,7 +1028,7 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, >>> if (dma_buf_is_dynamic(attach->dmabuf)) >>> dma_resv_assert_held(attach->dmabuf->resv); >>> >>> - attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction); >>> + __unmap_dma_buf(attach, sg_table, direction); >>> >>> if (dma_buf_is_dynamic(attach->dmabuf) && >>> !IS_ENABLED(CONFIG_DMABUF_MOVE_NOTIFY)) >>> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h >>> index 628681bf6c99..efdc56b9d95f 100644 >>> --- a/include/linux/dma-buf.h >>> +++ b/include/linux/dma-buf.h >>> @@ -154,6 +154,12 @@ struct dma_buf_ops { >>> * On failure, returns a negative error value wrapped into a pointer. >>> * May also return -EINTR when a signal was received while being >>> * blocked. >>> + * >>> + * Note that exporters should not try to cache the scatter list, or >>> + * return the same one for multiple calls. Caching is done either by the >>> + * DMA-BUF code (for non-dynamic importers) or the importer. Ownership >>> + * of the scatter list is transferred to the caller, and returned by >>> + * @unmap_dma_buf. >>> */ >>> struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *, >>> enum dma_data_direction); >