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authorDan Williams <dan.j.williams@intel.com>2016-11-16 09:00:38 -0800
committerDan Williams <dan.j.williams@intel.com>2016-11-16 09:00:38 -0800
commit4cb19355ea19995941ccaad115dbfac6b75215ca (patch)
treeec4bbe77017ce2002940f2e9c9b502a7abf648d4 /drivers/dax
parent6a84fb4b4e439a8ef0ce19ec7e7661ad76f655c9 (diff)
downloadop-kernel-dev-4cb19355ea19995941ccaad115dbfac6b75215ca.zip
op-kernel-dev-4cb19355ea19995941ccaad115dbfac6b75215ca.tar.gz
device-dax: fail all private mapping attempts
The device-dax implementation originally tried to be tricky and allow private read-only mappings, but in the process allowed writable MAP_PRIVATE + MAP_NORESERVE mappings. For simplicity and predictability just fail all private mapping attempts since device-dax memory is statically allocated and will never support overcommit. Cc: <stable@vger.kernel.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap") Reported-by: Pawel Lebioda <pawel.lebioda@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/dax.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 0e499bf..3d94ff2 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -270,8 +270,8 @@ static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma,
if (!dax_dev->alive)
return -ENXIO;
- /* prevent private / writable mappings from being established */
- if ((vma->vm_flags & (VM_NORESERVE|VM_SHARED|VM_WRITE)) == VM_WRITE) {
+ /* prevent private mappings from being established */
+ if ((vma->vm_flags & VM_SHARED) != VM_SHARED) {
dev_info(dev, "%s: %s: fail, attempted private mapping\n",
current->comm, func);
return -EINVAL;
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