mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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127e5f5ae5
Rework functionality of getting, setting and deleting of extended attributes. Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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* linux/fs/hfsplus/xattr_trusted.c
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*
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* Vyacheslav Dubeyko <slava@dubeyko.com>
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*
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* Handler for storing security labels as extended attributes.
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*/
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#include <linux/security.h>
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#include "hfsplus_fs.h"
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#include "xattr.h"
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static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
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void *buffer, size_t size, int type)
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{
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char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
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size_t len = strlen(name);
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if (!strcmp(name, ""))
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return -EINVAL;
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if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
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return -EOPNOTSUPP;
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strcpy(xattr_name, XATTR_SECURITY_PREFIX);
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strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
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return hfsplus_getxattr(dentry, xattr_name, buffer, size);
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}
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static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
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const void *buffer, size_t size, int flags, int type)
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{
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char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
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size_t len = strlen(name);
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if (!strcmp(name, ""))
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return -EINVAL;
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if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
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return -EOPNOTSUPP;
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strcpy(xattr_name, XATTR_SECURITY_PREFIX);
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strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
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return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
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}
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static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
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size_t list_size, const char *name, size_t name_len, int type)
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{
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/*
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* This method is not used.
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* It is used hfsplus_listxattr() instead of generic_listxattr().
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*/
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return -EOPNOTSUPP;
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}
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static int hfsplus_initxattrs(struct inode *inode,
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const struct xattr *xattr_array,
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void *fs_info)
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{
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const struct xattr *xattr;
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char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
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size_t xattr_name_len;
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int err = 0;
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for (xattr = xattr_array; xattr->name != NULL; xattr++) {
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xattr_name_len = strlen(xattr->name);
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if (xattr_name_len == 0)
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continue;
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if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
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HFSPLUS_ATTR_MAX_STRLEN)
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return -EOPNOTSUPP;
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strcpy(xattr_name, XATTR_SECURITY_PREFIX);
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strcpy(xattr_name +
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XATTR_SECURITY_PREFIX_LEN, xattr->name);
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memset(xattr_name +
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XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
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err = __hfsplus_setxattr(inode, xattr_name,
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xattr->value, xattr->value_len, 0);
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if (err)
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break;
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}
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return err;
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}
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int hfsplus_init_security(struct inode *inode, struct inode *dir,
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const struct qstr *qstr)
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{
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return security_inode_init_security(inode, dir, qstr,
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&hfsplus_initxattrs, NULL);
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}
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const struct xattr_handler hfsplus_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.list = hfsplus_security_listxattr,
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.get = hfsplus_security_getxattr,
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.set = hfsplus_security_setxattr,
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};
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