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Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

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Pull overlayfs updates from Miklos Szeredi:
 "This update contains fixes to the "use mounter's permission to access
  underlying layers" area, and miscellaneous other fixes and cleanups.

  No new features this time"

* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: use vfs_get_link()
  vfs: add vfs_get_link() helper
  ovl: use generic_readlink
  ovl: explain error values when removing acl from workdir
  ovl: Fix info leak in ovl_lookup_temp()
  ovl: during copy up, switch to mounter's creds early
  ovl: lookup: do getxattr with mounter's permission
  ovl: copy_up_xattr(): use strnlen
This commit is contained in:
Linus Torvalds
2016-10-14 17:23:33 -07:00
parent 5d89d9f502 7764235bec
commit 1a892b485f
6 changed files with 82 additions and 93 deletions
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44
fs/overlayfs/inode.c
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@@ -19,6 +19,7 @@ static int ovl_copy_up_truncate(struct dentry *dentry)
struct dentry *parent;
struct kstat stat;
struct path lowerpath;
const struct cred *old_cred;
parent = dget_parent(dentry);
err = ovl_copy_up(parent);
@@ -26,12 +27,14 @@ static int ovl_copy_up_truncate(struct dentry *dentry)
goto out_dput_parent;
ovl_path_lower(dentry, &lowerpath);
err = vfs_getattr(&lowerpath, &stat);
if (err)
goto out_dput_parent;
stat.size = 0;
err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);
old_cred = ovl_override_creds(dentry->d_sb);
err = vfs_getattr(&lowerpath, &stat);
if (!err) {
stat.size = 0;
err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);
}
revert_creds(old_cred);
out_dput_parent:
dput(parent);
@@ -153,45 +156,18 @@ static const char *ovl_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct dentry *realdentry;
struct inode *realinode;
const struct cred *old_cred;
const char *p;
if (!dentry)
return ERR_PTR(-ECHILD);
realdentry = ovl_dentry_real(dentry);
realinode = realdentry->d_inode;
if (WARN_ON(!realinode->i_op->get_link))
return ERR_PTR(-EPERM);
old_cred = ovl_override_creds(dentry->d_sb);
p = realinode->i_op->get_link(realdentry, realinode, done);
p = vfs_get_link(ovl_dentry_real(dentry), done);
revert_creds(old_cred);
return p;
}
static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
{
struct path realpath;
struct inode *realinode;
const struct cred *old_cred;
int err;
ovl_path_real(dentry, &realpath);
realinode = realpath.dentry->d_inode;
if (!realinode->i_op->readlink)
return -EINVAL;
old_cred = ovl_override_creds(dentry->d_sb);
err = realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
revert_creds(old_cred);
return err;
}
bool ovl_is_private_xattr(const char *name)
{
return strncmp(name, OVL_XATTR_PREFIX,
@@ -375,7 +351,7 @@ static const struct inode_operations ovl_file_inode_operations = {
static const struct inode_operations ovl_symlink_inode_operations = {
.setattr = ovl_setattr,
.get_link = ovl_get_link,
.readlink = ovl_readlink,
.readlink = generic_readlink,
.getattr = ovl_getattr,
.listxattr = ovl_listxattr,
.update_time = ovl_update_time,