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Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 8644ff278f02..e465ffe279bb 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -9,6 +9,7 @@
*/
#include <linux/mm.h>
+#include <linux/mm_inline.h>
#include <linux/hugetlb.h>
#include <linux/shm.h>
#include <linux/ksm.h>
@@ -23,6 +24,7 @@
#include <linux/mmu_notifier.h>
#include <linux/uaccess.h>
#include <linux/userfaultfd_k.h>
+#include <linux/mempolicy.h>
#include <asm/cacheflush.h>
#include <asm/tlb.h>
@@ -1012,6 +1014,9 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
/* can we just expand the current mapping? */
if (vma_expandable(vma, new_len - old_len)) {
long pages = (new_len - old_len) >> PAGE_SHIFT;
+ unsigned long extension_start = addr + old_len;
+ unsigned long extension_end = addr + new_len;
+ pgoff_t extension_pgoff = vma->vm_pgoff + (old_len >> PAGE_SHIFT);
if (vma->vm_flags & VM_ACCOUNT) {
if (security_vm_enough_memory_mm(mm, pages)) {
@@ -1020,8 +1025,18 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
}
}
- if (vma_adjust(vma, vma->vm_start, addr + new_len,
- vma->vm_pgoff, NULL)) {
+ /*
+ * Function vma_merge() is called on the extension we are adding to
+ * the already existing vma, vma_merge() will merge this extension with
+ * the already existing vma (expand operation itself) and possibly also
+ * with the next vma if it becomes adjacent to the expanded vma and
+ * otherwise compatible.
+ */
+ vma = vma_merge(mm, vma, extension_start, extension_end,
+ vma->vm_flags, vma->anon_vma, vma->vm_file,
+ extension_pgoff, vma_policy(vma),
+ vma->vm_userfaultfd_ctx, anon_vma_name(vma));
+ if (!vma) {
vm_unacct_memory(pages);
ret = -ENOMEM;
goto out;