aboutsummaryrefslogtreecommitdiffstats
path: root/mm
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2012-02-23 13:50:35 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-29 16:33:36 -0800
commit251ebc7bb45c7e27b8868b13fb56fedeedfc1da4 (patch)
treeb633573d388a5c3c8d4e610d00c8decb0bdee2fc /mm
parent62797c459126d343df0e9095fe1aa9ae3ebb3f89 (diff)
downloadkernel_samsung_crespo-251ebc7bb45c7e27b8868b13fb56fedeedfc1da4.zip
kernel_samsung_crespo-251ebc7bb45c7e27b8868b13fb56fedeedfc1da4.tar.gz
kernel_samsung_crespo-251ebc7bb45c7e27b8868b13fb56fedeedfc1da4.tar.bz2
NOMMU: Lock i_mmap_mutex for access to the VMA prio list
commit 918e556ec214ed2f584e4cac56d7b29e4bb6bf27 upstream. Lock i_mmap_mutex for access to the VMA prio list to prevent concurrent access. Currently, certain parts of the mmap handling are protected by the region mutex, but not all. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/nommu.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 9edc897..8397758 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -697,9 +697,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
+ mutex_lock(&mapping->i_mmap_mutex);
flush_dcache_mmap_lock(mapping);
vma_prio_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
+ mutex_unlock(&mapping->i_mmap_mutex);
}
/* add the VMA to the tree */
@@ -761,9 +763,11 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
+ mutex_lock(&mapping->i_mmap_mutex);
flush_dcache_mmap_lock(mapping);
vma_prio_tree_remove(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
+ mutex_unlock(&mapping->i_mmap_mutex);
}
/* remove from the MM's tree and list */
@@ -2061,6 +2065,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
down_write(&nommu_region_sem);
+ mutex_lock(&inode->i_mapping->i_mmap_mutex);
/* search for VMAs that fall within the dead zone */
vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
@@ -2068,6 +2073,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
/* found one - only interested if it's shared out of the page
* cache */
if (vma->vm_flags & VM_SHARED) {
+ mutex_unlock(&inode->i_mapping->i_mmap_mutex);
up_write(&nommu_region_sem);
return -ETXTBSY; /* not quite true, but near enough */
}
@@ -2095,6 +2101,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
}
}
+ mutex_unlock(&inode->i_mapping->i_mmap_mutex);
up_write(&nommu_region_sem);
return 0;
}