Revert "mremap: don't allow MREMAP_DONTUNMAP on special_mappings and aio"

This reverts commit cd544fd1dc9293c6702fab6effa63dac1cc67e99.

As discussed in [1] this commit was a no-op because the mapping type was
checked in vma_to_resize before move_vma is ever called.  This meant that
vm_ops->mremap() would never be called on such mappings.  Furthermore,
we've since expanded support of MREMAP_DONTUNMAP to non-anonymous
mappings, and these special mappings are still protected by the existing
check of !VM_DONTEXPAND and !VM_PFNMAP which will result in a -EINVAL.

1. https://lkml.org/lkml/2020/12/28/2340

Link: https://lkml.kernel.org/r/20210323182520.2712101-2-bgeffon@google.com
Signed-off-by: Brian Geffon <bgeffon@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Alejandro Colomar <alx.manpages@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: "Michael S . Tsirkin" <mst@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 935af2a..05a89e3 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -1458,7 +1458,7 @@ static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
        return 0;
 }
 
-static int pseudo_lock_dev_mremap(struct vm_area_struct *area, unsigned long flags)
+static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
 {
        /* Not supported */
        return -EINVAL;

diff --git a/fs/aio.c b/fs/aio.c
index 1f32da1..76ce0cc 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -323,16 +323,13 @@ static void aio_free_ring(struct kioctx *ctx)
        }
 }
 
-static int aio_ring_mremap(struct vm_area_struct *vma, unsigned long flags)
+static int aio_ring_mremap(struct vm_area_struct *vma)
 {
        struct file *file = vma->vm_file;
        struct mm_struct *mm = vma->vm_mm;
        struct kioctx_table *table;
        int i, res = -EINVAL;
 
-       if (flags & MREMAP_DONTUNMAP)
-               return -EINVAL;
-
        spin_lock(&mm->ioctx_lock);
        rcu_read_lock();
        table = rcu_dereference(mm->ioctx_table);

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a8335ce..93097db 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -580,7 +580,7 @@ struct vm_operations_struct {
        void (*close)(struct vm_area_struct * area);
        /* Called any time before splitting to check if it's allowed */
        int (*may_split)(struct vm_area_struct *area, unsigned long addr);
-       int (*mremap)(struct vm_area_struct *area, unsigned long flags);
+       int (*mremap)(struct vm_area_struct *area);
        /*
         * Called by mprotect() to make driver-specific permission
         * checks before mprotect() is finalised.   The VMA must not

diff --git a/mm/mmap.c b/mm/mmap.c
index 1d96a21..347ef9b 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3409,14 +3409,10 @@ static const char *special_mapping_name(struct vm_area_struct *vma)
        return ((struct vm_special_mapping *)vma->vm_private_data)->name;
 }
 
-static int special_mapping_mremap(struct vm_area_struct *new_vma,
-                                 unsigned long flags)
+static int special_mapping_mremap(struct vm_area_struct *new_vma)
 {
        struct vm_special_mapping *sm = new_vma->vm_private_data;
 
-       if (flags & MREMAP_DONTUNMAP)
-               return -EINVAL;
-
        if (WARN_ON_ONCE(current->mm != new_vma->vm_mm))
                return -EFAULT;
 

diff --git a/mm/mremap.c b/mm/mremap.c
index db5b8b2..d22629f 100644 (file)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -545,7 +545,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
        if (moved_len < old_len) {
                err = -ENOMEM;
        } else if (vma->vm_ops && vma->vm_ops->mremap) {
-               err = vma->vm_ops->mremap(new_vma, flags);
+               err = vma->vm_ops->mremap(new_vma);
        }
 
        if (unlikely(err)) {