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MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jan 2021 18:52:59.0566 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: TJy01zudz7xpwtD3ObECsX1wJMnn6Q5ImuieQQvhex18i/gEosT2x3+sWPtU1b83 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4391 Subject: Re: [Intel-gfx] [PATCH] dma-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: Chris Wilson , linaro-mm-sig@lists.linaro.org, David Stevens , Daniel Vetter , Sumit Semwal , linux-media@vger.kernel.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; 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Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chris Wilson , linaro-mm-sig@lists.linaro.org, David Stevens , Daniel Vetter , linux-media@vger.kernel.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" QW0gMTUuMDEuMjEgdW0gMTc6NDcgc2NocmllYiBEYW5pZWwgVmV0dGVyOgo+IFdlIGhhdmUgdG9v IG1hbnkgcGVvcGxlIGFidXNpbmcgdGhlIHN0cnVjdCBwYWdlIHRoZXkgY2FuIGdldCBhdCBidXQK PiByZWFsbHkgc2hvdWxkbid0IGluIGltcG9ydGVycy4gQXNpZGUgZnJvbSB0aGF0IHRoZSBiYWNr aW5nIHBhZ2UgbWlnaHQKPiBzaW1wbHkgbm90IGV4aXN0IChmb3IgZHluYW1pYyBwMnAgbWFwcGlu Z3MpIGxvb2tpbmcgYXQgaXQgYW5kIHVzaW5nIGl0Cj4gZS5nLiBmb3IgbW1hcCBjYW4gYWxzbyB3 cmVhayB0aGUgcGFnZSBoYW5kbGluZyBvZiB0aGUgZXhwb3J0ZXIKPiBjb21wbGV0ZWx5LiBJbXBv cnRlcnMgcmVhbGx5IG11c3QgZ28gdGhyb3VnaCB0aGUgcHJvcGVyIGludGVyZmFjZSBsaWtlCj4g ZG1hX2J1Zl9tbWFwIGZvciBldmVyeXRoaW5nLgo+Cj4gSSdtIHNlbWktdGVtcHRlZCB0byBlbmZv 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4391 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Am 15.01.21 um 17:47 schrieb Daniel Vetter: > We 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. > > v3: Only one copy of the mangle/unmangle code (Christian) > > v4: #ifdef, not #if (0day) > > v5: sg_table can also be an ERR_PTR (Chris, Christian) > > Reviewed-by: Chris Wilson (v2) > 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 Reviewed-by: Christian König > --- > drivers/dma-buf/Kconfig | 8 +++++++ > drivers/dma-buf/dma-buf.c | 46 +++++++++++++++++++++++++++++++++++---- > include/linux/dma-buf.h | 6 +++++ > 3 files changed, 56 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..f264b70c383e 100644 > --- a/drivers/dma-buf/dma-buf.c > +++ b/drivers/dma-buf/dma-buf.c > @@ -666,6 +666,34 @@ void dma_buf_put(struct dma_buf *dmabuf) > } > EXPORT_SYMBOL_GPL(dma_buf_put); > > +static void mangle_sg_table(struct sg_table *sg_table) > +{ > +#ifdef CONFIG_DMABUF_DEBUG > + 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 > + > +} > +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 (!IS_ERR_OR_NULL(sg_table)) > + mangle_sg_table(sg_table); > + > + 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 +765,7 @@ 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 +812,16 @@ 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) > +{ > + /* uses XOR, hence this unmangles */ > + mangle_sg_table(sg_table); > + > + 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 +840,7 @@ 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 +962,7 @@ 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 +1025,7 @@ 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);