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nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error

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commit 835745a377a4519decd1a36d6b926e369b3033e2 upstream.

The `nouveau_dmem_copy_one` function ensures that the copy push command is
sent to the device firmware but does not track whether it was executed
successfully.

In the case of a copy error (e.g., firmware or hardware failure), the
copy push command will be sent via the firmware channel, and
`nouveau_dmem_copy_one` will likely report success, leading to the
`migrate_to_ram` function returning a dirty HIGH_USER page to the user.

This can result in a security vulnerability, as a HIGH_USER page that may
contain sensitive or corrupted data could be returned to the user.

To prevent this vulnerability, we allocate a zero page. Thus, in case of
an error, a non-dirty (zero) page will be returned to the user.

Fixes: 5be73b6908 ("drm/nouveau/dmem: device memory helpers for SVM")
Signed-off-by: Yonatan Maman <Ymaman@Nvidia.com>
Co-developed-by: Gal Shalom <GalShalom@Nvidia.com>
Signed-off-by: Gal Shalom <GalShalom@Nvidia.com>
Reviewed-by: Ben Skeggs <bskeggs@nvidia.com>
Cc: stable@vger.kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241008115943.990286-3-ymaman@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yonatan Maman 2024-10-08 14:59:43 +03:00 • committed by Greg Kroah-Hartman
parent 8e0766fcf3
commit fd9bb7e996
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/nouveau/nouveau_dmem.c
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@ -139,7 +139,7 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
return 0;
dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address);
dpage = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vmf->vma, vmf->address);
if (!dpage)
return VM_FAULT_SIGBUS;
lock_page(dpage);