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Howlett" To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Lorenzo Stoakes , Jann Horn , David Hildenbrand , Qi Zheng , Kefeng Wang , Jeff Xu , Pedro Falcato , "Liam R. 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Howlett" vma_to_resize() is used in two locations to find and validate the vma for the mremap location. One of the two locations already has the vma, which is then re-found to validate the same vma. This code can be simplified by moving the vma_lookup() from vma_to_resize() to mremap_to() and changing the return type to an int error. Since the function now just validates the vma, the function is renamed to resize_is_valid() to better reflect what it is doing. This commit also adds documentation about the function. Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes Reviewed-by: Pedro Falcato --- mm/mremap.c | 53 +++++++++++++++++++++++++++++++---------------------- 1 file changed, 31 insertions(+), 22 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 5917feafe8cc..e781ec4573ca 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -826,17 +826,24 @@ static unsigned long move_vma(struct vm_area_struct *vma, return new_addr; } -static struct vm_area_struct *vma_to_resize(unsigned long addr, +/* + * resize_is_valid() - Ensure the vma can be resized to the new length at the give + * address. + * + * @vma: The vma to resize + * @addr: The old address + * @old_len: The current size + * @new_len: The desired size + * @flags: The vma flags + * + * Return 0 on success, error otherwise. + */ +static int resize_is_valid(struct vm_area_struct *vma, unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags) { struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; unsigned long pgoff; - vma = vma_lookup(mm, addr); - if (!vma) - return ERR_PTR(-EFAULT); - /* * !old_len is a special case where an attempt is made to 'duplicate' * a mapping. This makes no sense for private mappings as it will @@ -847,37 +854,37 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr, */ if (!old_len && !(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) { pr_warn_once("%s (%d): attempted to duplicate a private mapping with mremap. This is not supported.\n", current->comm, current->pid); - return ERR_PTR(-EINVAL); + return -EINVAL; } if ((flags & MREMAP_DONTUNMAP) && (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP))) - return ERR_PTR(-EINVAL); + return -EINVAL; /* We can't remap across vm area boundaries */ if (old_len > vma->vm_end - addr) - return ERR_PTR(-EFAULT); + return -EFAULT; if (new_len == old_len) - return vma; + return 0; /* Need to be careful about a growing mapping */ pgoff = (addr - vma->vm_start) >> PAGE_SHIFT; pgoff += vma->vm_pgoff; if (pgoff + (new_len >> PAGE_SHIFT) < pgoff) - return ERR_PTR(-EINVAL); + return -EINVAL; if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) - return ERR_PTR(-EFAULT); + return -EFAULT; if (!mlock_future_ok(mm, vma->vm_flags, new_len - old_len)) - return ERR_PTR(-EAGAIN); + return -EAGAIN; if (!may_expand_vm(mm, vma->vm_flags, (new_len - old_len) >> PAGE_SHIFT)) - return ERR_PTR(-ENOMEM); + return -ENOMEM; - return vma; + return 0; } static unsigned long mremap_to(unsigned long addr, unsigned long old_len, @@ -936,12 +943,16 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len, old_len = new_len; } - vma = vma_to_resize(addr, old_len, new_len, flags); - if (IS_ERR(vma)) { - ret = PTR_ERR(vma); + vma = vma_lookup(mm, addr); + if (!vma) { + ret = -EFAULT; goto out; } + ret = resize_is_valid(vma, addr, old_len, new_len, flags); + if (ret) + goto out; + /* MREMAP_DONTUNMAP expands by old_len since old_len == new_len */ if (flags & MREMAP_DONTUNMAP && !may_expand_vm(mm, vma->vm_flags, old_len >> PAGE_SHIFT)) { @@ -1114,11 +1125,9 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, /* * Ok, we need to grow.. */ - vma = vma_to_resize(addr, old_len, new_len, flags); - if (IS_ERR(vma)) { - ret = PTR_ERR(vma); + ret = resize_is_valid(vma, addr, old_len, new_len, flags); + if (ret) goto out; - } /* old_len exactly to the end of the area.. */