98e9cb5711
Add an additional "name" field to struct xattr_handler. When the name
is set, the handler matches attributes with exactly that name. When the
prefix is set instead, the handler matches attributes with the given
prefix and with a non-empty suffix.
This patch should avoid bugs like the one fixed in commit c361016a in
the future.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2006 NEC Corporation
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*
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* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/jffs2.h>
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#include <linux/xattr.h>
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#include <linux/mtd/mtd.h>
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#include "nodelist.h"
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static int jffs2_trusted_getxattr(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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void *buffer, size_t size)
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{
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return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
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name, buffer, size);
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}
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static int jffs2_trusted_setxattr(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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const void *buffer, size_t size, int flags)
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{
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return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
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name, buffer, size, flags);
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}
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static size_t jffs2_trusted_listxattr(const struct xattr_handler *handler,
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struct dentry *dentry, char *list,
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size_t list_size, const char *name,
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size_t name_len)
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{
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size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
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if (!capable(CAP_SYS_ADMIN))
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return 0;
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if (list && retlen<=list_size) {
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strcpy(list, XATTR_TRUSTED_PREFIX);
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strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);
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}
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return retlen;
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}
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const struct xattr_handler jffs2_trusted_xattr_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.list = jffs2_trusted_listxattr,
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.set = jffs2_trusted_setxattr,
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.get = jffs2_trusted_getxattr
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};
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