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fs/ext4/xattr_trusted.c
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/* |
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* linux/fs/ext4/xattr_trusted.c |
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* Handler for trusted extended attributes. * * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/module.h> #include <linux/string.h> #include <linux/capability.h> #include <linux/fs.h> |
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#include <linux/ext4_jbd2.h> |
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#include <linux/ext4_fs.h> |
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#include "xattr.h" #define XATTR_TRUSTED_PREFIX "trusted." static size_t |
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ext4_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, |
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const char *name, size_t name_len) { const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; 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 |
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ext4_xattr_trusted_get(struct inode *inode, const char *name, |
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void *buffer, size_t size) { if (strcmp(name, "") == 0) return -EINVAL; |
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return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
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buffer, size); } static int |
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ext4_xattr_trusted_set(struct inode *inode, const char *name, |
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const void *value, size_t size, int flags) { if (strcmp(name, "") == 0) return -EINVAL; |
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return ext4_xattr_set(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
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value, size, flags); } |
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struct xattr_handler ext4_xattr_trusted_handler = { |
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.prefix = XATTR_TRUSTED_PREFIX, |
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.list = ext4_xattr_trusted_list, .get = ext4_xattr_trusted_get, .set = ext4_xattr_trusted_set, |
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}; |