From 7c03e2cda4a584cadc398e8f6641ca9988a39d52 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Mon, 14 Dec 2020 15:26:13 +0100 Subject: 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 Acked-by: James Morris --- fs/xattr.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'fs/xattr.c') diff --git a/fs/xattr.c b/fs/xattr.c index cd7a563e8bcd..fd57153b1f61 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -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); -- cgit v1.2.3