diff options
| author | Nick Piggin <npiggin@suse.de> | 2008-02-02 03:08:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-06 11:43:46 -0800 |
| commit | 83af8eda68a3f0c227d0eb05348e58ae27a62e7e (patch) | |
| tree | 33ce1f20faa9337c5c08f39dd840c34dc311e041 /drivers | |
| parent | 0abe2d30fd090eba86541654080fee7686cf72fc (diff) | |
vm audit: add VM_DONTEXPAND to mmap for drivers that need it (CVE-2008-0007)
Drivers that register a ->fault handler, but do not range-check the
offset argument, must set VM_DONTEXPAND in the vm_flags in order to
prevent an expanding mremap from overflowing the resource.
I've audited the tree and attempted to fix these problems (usually by
adding VM_DONTEXPAND where it is not obvious).
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/drm/drm_vm.c | 2 | ||||
| -rw-r--r-- | drivers/char/mspec.c | 3 |
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c index b5c5b9fa84c3..e2d7be943cce 100644 --- a/drivers/char/drm/drm_vm.c +++ b/drivers/char/drm/drm_vm.c @@ -520,6 +520,7 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) vma->vm_ops = &drm_vm_dma_ops; vma->vm_flags |= VM_RESERVED; /* Don't swap */ + vma->vm_flags |= VM_DONTEXPAND; vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open_locked(vma); @@ -669,6 +670,7 @@ static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) return -EINVAL; /* This should never happen. */ } vma->vm_flags |= VM_RESERVED; /* Don't swap */ + vma->vm_flags |= VM_DONTEXPAND; vma->vm_file = filp; /* Needed for drm_vm_open() */ drm_vm_open_locked(vma); diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c index 7ac30612068b..5685b7a77c38 100644 --- a/drivers/char/mspec.c +++ b/drivers/char/mspec.c @@ -265,7 +265,8 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma, int type) vdata->refcnt = ATOMIC_INIT(1); vma->vm_private_data = vdata; - vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP); + vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP | + VM_DONTEXPAND); if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED) vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); vma->vm_ops = &mspec_vm_ops; |