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

This reverts commit cd544fd1dc.

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>
This commit is contained in:
Brian Geffon 2021-04-29 22:57:48 -07:00 committed by Linus Torvalds
parent a460938785
commit 14d071134c
5 changed files with 5 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/cpu/resctrl/pseudo_lock.c
View File

@ -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;

5
fs/aio.c
View File

@ -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);

2
include/linux/mm.h
View File

@ -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

6
mm/mmap.c
View File

@ -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;

2
mm/mremap.c
View File

@ -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)) {