From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/ext4/xattr_trusted.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 fs/ext4/xattr_trusted.c (limited to 'fs/ext4/xattr_trusted.c') diff --git a/fs/ext4/xattr_trusted.c b/fs/ext4/xattr_trusted.c new file mode 100644 index 000000000..891ee2ddf --- /dev/null +++ b/fs/ext4/xattr_trusted.c @@ -0,0 +1,58 @@ +/* + * linux/fs/ext4/xattr_trusted.c + * Handler for trusted extended attributes. + * + * Copyright (C) 2003 by Andreas Gruenbacher, + */ + +#include +#include +#include +#include "ext4_jbd2.h" +#include "ext4.h" +#include "xattr.h" + +static size_t +ext4_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, + const char *name, size_t name_len, int type) +{ + const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN; + const size_t total_len = prefix_len + name_len + 1; + + if (!capable(CAP_SYS_ADMIN)) + return 0; + + if (list && total_len <= list_size) { + memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); + memcpy(list+prefix_len, name, name_len); + list[prefix_len + name_len] = '\0'; + } + return total_len; +} + +static int +ext4_xattr_trusted_get(struct dentry *dentry, const char *name, void *buffer, + size_t size, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_TRUSTED, + name, buffer, size); +} + +static int +ext4_xattr_trusted_set(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags, int type) +{ + if (strcmp(name, "") == 0) + return -EINVAL; + return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_TRUSTED, + name, value, size, flags); +} + +const struct xattr_handler ext4_xattr_trusted_handler = { + .prefix = XATTR_TRUSTED_PREFIX, + .list = ext4_xattr_trusted_list, + .get = ext4_xattr_trusted_get, + .set = ext4_xattr_trusted_set, +}; -- cgit v1.2.3-54-g00ecf