[PATCH 0/2] Fix purging buffers in the shmem helpers

[PATCH 0/2] Fix purging buffers in the shmem helpers

[Neil Roberts]

These two patches fix a problem with the madvise purging code for the
shmem helpers where the mmaping for a purged buffer wouldn't get
invalidated correctly. This presumably ends up as a security hole
where the mapping can be accessed from user-space to read and write
random pages from other buffers. This is currently affecting Panfrost.
The second patch is a v2 from a patch that was sent standalone.

There is a WIP IGT test for Panfrost which demonstrates the bug here:

https://gitlab.freedesktop.org/nroberts/igt-gpu-tools/-/commits/panfrost-purgemap/

Neil Roberts (2):
  drm/shmem-helper: Check for purged buffers in fault handler
  drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff

 drivers/gpu/drm/drm_gem_shmem_helper.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

-- 
2.29.2

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[PATCH 1/2] drm/shmem-helper: Check for purged buffers in fault handler

[Neil Roberts]

When a buffer is madvised as not needed and then purged, any attempts to
access the buffer from user-space should cause a bus fault. This patch
adds a check for that.

Cc: stable@vger.kernel.org
Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
Signed-off-by: Neil Roberts <nroberts@igalia.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 9825c378dfa6..b26139b1dc35 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -525,14 +525,24 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	struct drm_gem_object *obj = vma->vm_private_data;
 	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
 	loff_t num_pages = obj->size >> PAGE_SHIFT;
+	vm_fault_t ret;
 	struct page *page;
 
-	if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages))
-		return VM_FAULT_SIGBUS;
+	mutex_lock(&shmem->pages_lock);
+
+	if (vmf->pgoff >= num_pages ||
+	    WARN_ON_ONCE(!shmem->pages) ||
+	    shmem->madv < 0) {
+		ret = VM_FAULT_SIGBUS;
+	} else {
+		page = shmem->pages[vmf->pgoff];
 
-	page = shmem->pages[vmf->pgoff];
+		ret = vmf_insert_page(vma, vmf->address, page);
+	}
 
-	return vmf_insert_page(vma, vmf->address, page);
+	mutex_unlock(&shmem->pages_lock);
+
+	return ret;
 }
 
 static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
-- 
2.29.2

[PATCH 1/2] drm/shmem-helper: Check for purged buffers in fault handler

[Neil Roberts]

When a buffer is madvised as not needed and then purged, any attempts to
access the buffer from user-space should cause a bus fault. This patch
adds a check for that.

Cc: stable@vger.kernel.org
Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
Signed-off-by: Neil Roberts <nroberts@igalia.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 9825c378dfa6..b26139b1dc35 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -525,14 +525,24 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	struct drm_gem_object *obj = vma->vm_private_data;
 	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
 	loff_t num_pages = obj->size >> PAGE_SHIFT;
+	vm_fault_t ret;
 	struct page *page;
 
-	if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages))
-		return VM_FAULT_SIGBUS;
+	mutex_lock(&shmem->pages_lock);
+
+	if (vmf->pgoff >= num_pages ||
+	    WARN_ON_ONCE(!shmem->pages) ||
+	    shmem->madv < 0) {
+		ret = VM_FAULT_SIGBUS;
+	} else {
+		page = shmem->pages[vmf->pgoff];
 
-	page = shmem->pages[vmf->pgoff];
+		ret = vmf_insert_page(vma, vmf->address, page);
+	}
 
-	return vmf_insert_page(vma, vmf->address, page);
+	mutex_unlock(&shmem->pages_lock);
+
+	return ret;
 }
 
 static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
-- 
2.29.2

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Re: [PATCH 1/2] drm/shmem-helper: Check for purged buffers in fault handler

[Steven Price]

On 23/02/2021 15:51, Neil Roberts wrote:
> When a buffer is madvised as not needed and then purged, any attempts to
> access the buffer from user-space should cause a bus fault. This patch
> adds a check for that.
> 
> Cc: stable@vger.kernel.org
> Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
> Signed-off-by: Neil Roberts <nroberts@igalia.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/drm_gem_shmem_helper.c | 18 ++++++++++++++----
>   1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 9825c378dfa6..b26139b1dc35 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -525,14 +525,24 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
>   	struct drm_gem_object *obj = vma->vm_private_data;
>   	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
>   	loff_t num_pages = obj->size >> PAGE_SHIFT;
> +	vm_fault_t ret;
>   	struct page *page;
>   
> -	if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages))
> -		return VM_FAULT_SIGBUS;
> +	mutex_lock(&shmem->pages_lock);
> +
> +	if (vmf->pgoff >= num_pages ||
> +	    WARN_ON_ONCE(!shmem->pages) ||
> +	    shmem->madv < 0) {
> +		ret = VM_FAULT_SIGBUS;
> +	} else {
> +		page = shmem->pages[vmf->pgoff];
>   
> -	page = shmem->pages[vmf->pgoff];
> +		ret = vmf_insert_page(vma, vmf->address, page);
> +	}
>   
> -	return vmf_insert_page(vma, vmf->address, page);
> +	mutex_unlock(&shmem->pages_lock);
> +
> +	return ret;
>   }
>   
>   static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
> 

Re: [PATCH 1/2] drm/shmem-helper: Check for purged buffers in fault handler

[Steven Price]

On 23/02/2021 15:51, Neil Roberts wrote:
> When a buffer is madvised as not needed and then purged, any attempts to
> access the buffer from user-space should cause a bus fault. This patch
> adds a check for that.
> 
> Cc: stable@vger.kernel.org
> Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
> Signed-off-by: Neil Roberts <nroberts@igalia.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/drm_gem_shmem_helper.c | 18 ++++++++++++++----
>   1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 9825c378dfa6..b26139b1dc35 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -525,14 +525,24 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
>   	struct drm_gem_object *obj = vma->vm_private_data;
>   	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
>   	loff_t num_pages = obj->size >> PAGE_SHIFT;
> +	vm_fault_t ret;
>   	struct page *page;
>   
> -	if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages))
> -		return VM_FAULT_SIGBUS;
> +	mutex_lock(&shmem->pages_lock);
> +
> +	if (vmf->pgoff >= num_pages ||
> +	    WARN_ON_ONCE(!shmem->pages) ||
> +	    shmem->madv < 0) {
> +		ret = VM_FAULT_SIGBUS;
> +	} else {
> +		page = shmem->pages[vmf->pgoff];
>   
> -	page = shmem->pages[vmf->pgoff];
> +		ret = vmf_insert_page(vma, vmf->address, page);
> +	}
>   
> -	return vmf_insert_page(vma, vmf->address, page);
> +	mutex_unlock(&shmem->pages_lock);
> +
> +	return ret;
>   }
>   
>   static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
> 

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[PATCH v2 2/2] drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff

[Neil Roberts]

When mmapping the shmem, it would previously adjust the pgoff in the
vm_area_struct to remove the fake offset that is added to be able to
identify the buffer. This patch removes the adjustment and makes the
fault handler use the vm_fault address to calculate the page offset
instead. Although using this address is apparently discouraged, several
DRM drivers seem to be doing it anyway.

The problem with removing the pgoff is that it prevents
drm_vma_node_unmap from working because that searches the mapping tree
by address. That doesn't work because all of the mappings are at offset
0. drm_vma_node_unmap is being used by the shmem helpers when purging
the buffer.

This fixes a bug in Panfrost which is using drm_gem_shmem_purge. Without
this the mapping for the purged buffer can still be accessed which might
mean it would access random pages from other buffers

v2: Don't check whether the unsigned page_offset is less than 0.

Cc: stable@vger.kernel.org
Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
Signed-off-by: Neil Roberts <nroberts@igalia.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index b26139b1dc35..5b5c095e86a9 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -527,15 +527,19 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	loff_t num_pages = obj->size >> PAGE_SHIFT;
 	vm_fault_t ret;
 	struct page *page;
+	pgoff_t page_offset;
+
+	/* We don't use vmf->pgoff since that has the fake offset */
+	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
 	mutex_lock(&shmem->pages_lock);
 
-	if (vmf->pgoff >= num_pages ||
+	if (page_offset >= num_pages ||
 	    WARN_ON_ONCE(!shmem->pages) ||
 	    shmem->madv < 0) {
 		ret = VM_FAULT_SIGBUS;
 	} else {
-		page = shmem->pages[vmf->pgoff];
+		page = shmem->pages[page_offset];
 
 		ret = vmf_insert_page(vma, vmf->address, page);
 	}
@@ -591,9 +595,6 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	struct drm_gem_shmem_object *shmem;
 	int ret;
 
-	/* Remove the fake offset */
-	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
-
 	if (obj->import_attach) {
 		/* Drop the reference drm_gem_mmap_obj() acquired.*/
 		drm_gem_object_put(obj);
-- 
2.29.2

[PATCH v2 2/2] drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff

[Neil Roberts]

When mmapping the shmem, it would previously adjust the pgoff in the
vm_area_struct to remove the fake offset that is added to be able to
identify the buffer. This patch removes the adjustment and makes the
fault handler use the vm_fault address to calculate the page offset
instead. Although using this address is apparently discouraged, several
DRM drivers seem to be doing it anyway.

The problem with removing the pgoff is that it prevents
drm_vma_node_unmap from working because that searches the mapping tree
by address. That doesn't work because all of the mappings are at offset
0. drm_vma_node_unmap is being used by the shmem helpers when purging
the buffer.

This fixes a bug in Panfrost which is using drm_gem_shmem_purge. Without
this the mapping for the purged buffer can still be accessed which might
mean it would access random pages from other buffers

v2: Don't check whether the unsigned page_offset is less than 0.

Cc: stable@vger.kernel.org
Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
Signed-off-by: Neil Roberts <nroberts@igalia.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index b26139b1dc35..5b5c095e86a9 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -527,15 +527,19 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 	loff_t num_pages = obj->size >> PAGE_SHIFT;
 	vm_fault_t ret;
 	struct page *page;
+	pgoff_t page_offset;
+
+	/* We don't use vmf->pgoff since that has the fake offset */
+	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
 	mutex_lock(&shmem->pages_lock);
 
-	if (vmf->pgoff >= num_pages ||
+	if (page_offset >= num_pages ||
 	    WARN_ON_ONCE(!shmem->pages) ||
 	    shmem->madv < 0) {
 		ret = VM_FAULT_SIGBUS;
 	} else {
-		page = shmem->pages[vmf->pgoff];
+		page = shmem->pages[page_offset];
 
 		ret = vmf_insert_page(vma, vmf->address, page);
 	}
@@ -591,9 +595,6 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	struct drm_gem_shmem_object *shmem;
 	int ret;
 
-	/* Remove the fake offset */
-	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
-
 	if (obj->import_attach) {
 		/* Drop the reference drm_gem_mmap_obj() acquired.*/
 		drm_gem_object_put(obj);
-- 
2.29.2

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Re: [PATCH v2 2/2] drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff

[Steven Price]

On 23/02/2021 15:51, Neil Roberts wrote:
> When mmapping the shmem, it would previously adjust the pgoff in the
> vm_area_struct to remove the fake offset that is added to be able to
> identify the buffer. This patch removes the adjustment and makes the
> fault handler use the vm_fault address to calculate the page offset
> instead. Although using this address is apparently discouraged, several
> DRM drivers seem to be doing it anyway.
> 
> The problem with removing the pgoff is that it prevents
> drm_vma_node_unmap from working because that searches the mapping tree
> by address. That doesn't work because all of the mappings are at offset
> 0. drm_vma_node_unmap is being used by the shmem helpers when purging
> the buffer.
> 
> This fixes a bug in Panfrost which is using drm_gem_shmem_purge. Without
> this the mapping for the purged buffer can still be accessed which might
> mean it would access random pages from other buffers
> 
> v2: Don't check whether the unsigned page_offset is less than 0.
> 
> Cc: stable@vger.kernel.org
> Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
> Signed-off-by: Neil Roberts <nroberts@igalia.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/drm_gem_shmem_helper.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index b26139b1dc35..5b5c095e86a9 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -527,15 +527,19 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
>   	loff_t num_pages = obj->size >> PAGE_SHIFT;
>   	vm_fault_t ret;
>   	struct page *page;
> +	pgoff_t page_offset;
> +
> +	/* We don't use vmf->pgoff since that has the fake offset */
> +	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
>   
>   	mutex_lock(&shmem->pages_lock);
>   
> -	if (vmf->pgoff >= num_pages ||
> +	if (page_offset >= num_pages ||
>   	    WARN_ON_ONCE(!shmem->pages) ||
>   	    shmem->madv < 0) {
>   		ret = VM_FAULT_SIGBUS;
>   	} else {
> -		page = shmem->pages[vmf->pgoff];
> +		page = shmem->pages[page_offset];
>   
>   		ret = vmf_insert_page(vma, vmf->address, page);
>   	}
> @@ -591,9 +595,6 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
>   	struct drm_gem_shmem_object *shmem;
>   	int ret;
>   
> -	/* Remove the fake offset */
> -	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
> -
>   	if (obj->import_attach) {
>   		/* Drop the reference drm_gem_mmap_obj() acquired.*/
>   		drm_gem_object_put(obj);
> 

Re: [PATCH v2 2/2] drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff

[Steven Price]

On 23/02/2021 15:51, Neil Roberts wrote:
> When mmapping the shmem, it would previously adjust the pgoff in the
> vm_area_struct to remove the fake offset that is added to be able to
> identify the buffer. This patch removes the adjustment and makes the
> fault handler use the vm_fault address to calculate the page offset
> instead. Although using this address is apparently discouraged, several
> DRM drivers seem to be doing it anyway.
> 
> The problem with removing the pgoff is that it prevents
> drm_vma_node_unmap from working because that searches the mapping tree
> by address. That doesn't work because all of the mappings are at offset
> 0. drm_vma_node_unmap is being used by the shmem helpers when purging
> the buffer.
> 
> This fixes a bug in Panfrost which is using drm_gem_shmem_purge. Without
> this the mapping for the purged buffer can still be accessed which might
> mean it would access random pages from other buffers
> 
> v2: Don't check whether the unsigned page_offset is less than 0.
> 
> Cc: stable@vger.kernel.org
> Fixes: 17acb9f35ed7 ("drm/shmem: Add madvise state and purge helpers")
> Signed-off-by: Neil Roberts <nroberts@igalia.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/drm_gem_shmem_helper.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index b26139b1dc35..5b5c095e86a9 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -527,15 +527,19 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
>   	loff_t num_pages = obj->size >> PAGE_SHIFT;
>   	vm_fault_t ret;
>   	struct page *page;
> +	pgoff_t page_offset;
> +
> +	/* We don't use vmf->pgoff since that has the fake offset */
> +	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
>   
>   	mutex_lock(&shmem->pages_lock);
>   
> -	if (vmf->pgoff >= num_pages ||
> +	if (page_offset >= num_pages ||
>   	    WARN_ON_ONCE(!shmem->pages) ||
>   	    shmem->madv < 0) {
>   		ret = VM_FAULT_SIGBUS;
>   	} else {
> -		page = shmem->pages[vmf->pgoff];
> +		page = shmem->pages[page_offset];
>   
>   		ret = vmf_insert_page(vma, vmf->address, page);
>   	}
> @@ -591,9 +595,6 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
>   	struct drm_gem_shmem_object *shmem;
>   	int ret;
>   
> -	/* Remove the fake offset */
> -	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
> -
>   	if (obj->import_attach) {
>   		/* Drop the reference drm_gem_mmap_obj() acquired.*/
>   		drm_gem_object_put(obj);
> 

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Re: [PATCH 0/2] Fix purging buffers in the shmem helpers

[Steven Price]

On 23/02/2021 15:51, Neil Roberts wrote:
> These two patches fix a problem with the madvise purging code for the
> shmem helpers where the mmaping for a purged buffer wouldn't get
> invalidated correctly. This presumably ends up as a security hole
> where the mapping can be accessed from user-space to read and write
> random pages from other buffers. This is currently affecting Panfrost.
> The second patch is a v2 from a patch that was sent standalone.
> 
> There is a WIP IGT test for Panfrost which demonstrates the bug here:
> 
> https://gitlab.freedesktop.org/nroberts/igt-gpu-tools/-/commits/panfrost-purgemap/
> 
> Neil Roberts (2):
>    drm/shmem-helper: Check for purged buffers in fault handler
>    drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff
> 
>   drivers/gpu/drm/drm_gem_shmem_helper.c | 25 ++++++++++++++++++-------
>   1 file changed, 18 insertions(+), 7 deletions(-)
> 

Pushed to drm-misc-fixes

Thanks,

Steve
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