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Howlett" To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , maple-tree@lists.infradead.org Cc: "Liam R. Howlett" , "Liam R . 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Howlett" Create a helper for duplicating the anon vma when adjusting the vma. This simplifies the logic of __vma_adjust(). Signed-off-by: Liam R. Howlett --- mm/mmap.c | 74 ++++++++++++++++++++++++++++++------------------------- 1 file changed, 40 insertions(+), 34 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index da58f428c5c0..0a2b19633174 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -620,6 +620,29 @@ static inline void vma_complete(struct vma_prepare *vp, uprobe_mmap(vp->insert); } +/* + * dup_anon_vma() - Helper function to duplicate anon_vma + * @dst: The destination VMA + * @src: The source VMA + * + * Returns: 0 on success. + */ +static inline int dup_anon_vma(struct vm_area_struct *dst, + struct vm_area_struct *src) +{ + /* + * Easily overlooked: when mprotect shifts the boundary, make sure the + * expanding vma has anon_vma set if the shrinking vma had, to cover any + * anon pages imported. + */ + if (src->anon_vma && !dst->anon_vma) { + dst->anon_vma = src->anon_vma; + return anon_vma_clone(dst, src); + } + + return 0; +} + /* * vma_expand - Expand an existing VMA * @@ -645,15 +668,12 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma, struct vma_prepare vp; if (next && (vma != next) && (end == next->vm_end)) { - remove_next = true; - if (next->anon_vma && !vma->anon_vma) { - int error; + int ret; - vma->anon_vma = next->anon_vma; - error = anon_vma_clone(vma, next); - if (error) - return error; - } + remove_next = true; + ret = dup_anon_vma(vma, next); + if (ret) + return ret; } init_multi_vma_prep(&vp, vma, NULL, remove_next ? next : NULL, NULL); @@ -742,10 +762,11 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma, struct file *file = vma->vm_file; bool vma_changed = false; long adjust_next = 0; - struct vm_area_struct *exporter = NULL, *importer = NULL; struct vma_prepare vma_prep; if (next) { + int error = 0; + if (end >= next->vm_end) { /* * vma expands, overlapping all the next, and @@ -780,15 +801,14 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma, end != remove2->vm_end); } - exporter = next; - importer = vma; - /* * If next doesn't have anon_vma, import from vma after * next, if the vma overlaps with it. */ - if (remove2 != NULL && !next->anon_vma) - exporter = remove2; + if (remove != NULL && !next->anon_vma) + error = dup_anon_vma(vma, remove2); + else + error = dup_anon_vma(vma, remove); } else if (end > next->vm_start) { /* @@ -796,9 +816,8 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma, * mprotect case 5 shifting the boundary up. */ adjust_next = (end - next->vm_start); - exporter = next; - importer = vma; - VM_WARN_ON(expand != importer); + VM_WARN_ON(expand != vma); + error = dup_anon_vma(vma, next); } else if (end < vma->vm_end) { /* * vma shrinks, and !insert tells it's not @@ -806,24 +825,11 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma, * mprotect case 4 shifting the boundary down. */ adjust_next = -(vma->vm_end - end); - exporter = vma; - importer = next; - VM_WARN_ON(expand != importer); - } - - /* - * Easily overlooked: when mprotect shifts the boundary, - * make sure the expanding vma has anon_vma set if the - * shrinking vma had, to cover any anon pages imported. - */ - if (exporter && exporter->anon_vma && !importer->anon_vma) { - int error; - - importer->anon_vma = exporter->anon_vma; - error = anon_vma_clone(importer, exporter); - if (error) - return error; + VM_WARN_ON(expand != next); + error = dup_anon_vma(next, vma); } + if (error) + return error; } if (vma_iter_prealloc(vmi)) -- 2.35.1