From b4bf802a5a6563c22d5e41a0f8873088bd3f655e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 1 Sep 2017 17:39:17 +0200 Subject: [PATCH] mm/nommu: switch do_mmap_private to kernel_read Instead of playing with the address limit. This also gains us validation of the kvec and proper atime updates. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- mm/nommu.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/mm/nommu.c b/mm/nommu.c index fc184f597d59..e907a25ec9bd 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1164,17 +1164,12 @@ static int do_mmap_private(struct vm_area_struct *vma, if (vma->vm_file) { /* read the contents of a file into the copy */ - mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; - old_fs = get_fs(); - set_fs(KERNEL_DS); - ret = __vfs_read(vma->vm_file, base, len, &fpos); - set_fs(old_fs); - + ret = kernel_read(vma->vm_file, base, len, &fpos); if (ret < 0) goto error_free;