vfs: move cap_convert_nscap() call into vfs_setxattr()

cap_convert_nscap() does permission checking as well as conversion of the
xattr value conditionally based on fs's user-ns.

This is needed by overlayfs and probably other layered fs (ecryptfs) and is
what vfs_foo() is supposed to do anyway.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: James Morris <jamorris@linux.microsoft.com>
This commit is contained in:
Miklos Szeredi
2020-12-14 15:26:13 +01:00
parent c11faf3259
commit 7c03e2cda4
3 changed files with 13 additions and 9 deletions

View File

@@ -276,8 +276,16 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
{
struct inode *inode = dentry->d_inode;
struct inode *delegated_inode = NULL;
const void *orig_value = value;
int error;
if (size && strcmp(name, XATTR_NAME_CAPS) == 0) {
error = cap_convert_nscap(dentry, &value, size);
if (error < 0)
return error;
size = error;
}
retry_deleg:
inode_lock(inode);
error = __vfs_setxattr_locked(dentry, name, value, size, flags,
@@ -289,6 +297,9 @@ retry_deleg:
if (!error)
goto retry_deleg;
}
if (value != orig_value)
kfree(value);
return error;
}
EXPORT_SYMBOL_GPL(vfs_setxattr);
@@ -537,12 +548,6 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
(strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
posix_acl_fix_xattr_from_user(kvalue, size);
else if (strcmp(kname, XATTR_NAME_CAPS) == 0) {
error = cap_convert_nscap(d, &kvalue, size);
if (error < 0)
goto out;
size = error;
}
}
error = vfs_setxattr(d, kname, kvalue, size, flags);