xfs: Change how listxattr generates synthetic attributes
Instead of adding the synthesized POSIX ACL attribute names after listing all non-synthesized attributes, generate them immediately when listing the non-synthesized attributes. In addition, merge xfs_xattr_put_listent and xfs_xattr_put_listent_sizes to ensure that the list size is computed correctly; the split version was overestimating the list size for non-root users. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: xfs@oss.sgi.com Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher
Al Viro
Родитель
786534b92f
Коммит
5d92b75c75
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@ -252,29 +252,6 @@ xfs_set_mode(struct inode *inode, umode_t mode)
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return error;
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}
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static int
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xfs_acl_exists(struct inode *inode, unsigned char *name)
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{
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int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));
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return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
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ATTR_ROOT|ATTR_KERNOVAL) == 0);
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}
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int
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posix_acl_access_exists(struct inode *inode)
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{
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return xfs_acl_exists(inode, SGI_ACL_FILE);
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}
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int
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posix_acl_default_exists(struct inode *inode)
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{
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if (!S_ISDIR(inode->i_mode))
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return 0;
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return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
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}
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int
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xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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@ -24,16 +24,12 @@ struct posix_acl;
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#ifdef CONFIG_XFS_POSIX_ACL
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extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
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extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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extern int posix_acl_access_exists(struct inode *inode);
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extern int posix_acl_default_exists(struct inode *inode);
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#else
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static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
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{
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return NULL;
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}
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# define xfs_set_acl NULL
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# define posix_acl_access_exists(inode) 0
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# define posix_acl_default_exists(inode) 0
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#endif /* CONFIG_XFS_POSIX_ACL */
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extern void xfs_forget_acl(struct inode *inode, const char *name, int xflags);
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@ -129,24 +129,35 @@ const struct xattr_handler *xfs_xattr_handlers[] = {
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NULL
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};
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static unsigned int xfs_xattr_prefix_len(int flags)
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static int
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__xfs_xattr_put_listent(
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struct xfs_attr_list_context *context,
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char *prefix,
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int prefix_len,
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unsigned char *name,
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int namelen)
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{
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if (flags & XFS_ATTR_SECURE)
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return sizeof("security");
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else if (flags & XFS_ATTR_ROOT)
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return sizeof("trusted");
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else
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return sizeof("user");
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}
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char *offset;
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int arraytop;
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static const char *xfs_xattr_prefix(int flags)
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{
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if (flags & XFS_ATTR_SECURE)
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return xfs_xattr_security_handler.prefix;
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else if (flags & XFS_ATTR_ROOT)
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return xfs_xattr_trusted_handler.prefix;
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else
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return xfs_xattr_user_handler.prefix;
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if (!context->alist)
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goto compute_size;
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arraytop = context->count + prefix_len + namelen + 1;
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if (arraytop > context->firstu) {
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context->count = -1; /* insufficient space */
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return 1;
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}
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offset = (char *)context->alist + context->count;
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strncpy(offset, prefix, prefix_len);
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offset += prefix_len;
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strncpy(offset, (char *)name, namelen); /* real name */
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offset += namelen;
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*offset = '\0';
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compute_size:
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context->count += prefix_len + namelen + 1;
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return 0;
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}
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static int
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@ -158,61 +169,55 @@ xfs_xattr_put_listent(
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int valuelen,
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unsigned char *value)
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{
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unsigned int prefix_len = xfs_xattr_prefix_len(flags);
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char *offset;
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int arraytop;
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char *prefix;
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int prefix_len;
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ASSERT(context->count >= 0);
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/*
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* Only show root namespace entries if we are actually allowed to
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* see them.
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*/
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if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
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return 0;
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if (flags & XFS_ATTR_ROOT) {
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#ifdef CONFIG_XFS_POSIX_ACL
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if (namelen == SGI_ACL_FILE_SIZE &&
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strncmp(name, SGI_ACL_FILE,
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SGI_ACL_FILE_SIZE) == 0) {
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int ret = __xfs_xattr_put_listent(
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context, XATTR_SYSTEM_PREFIX,
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XATTR_SYSTEM_PREFIX_LEN,
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XATTR_POSIX_ACL_ACCESS,
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strlen(XATTR_POSIX_ACL_ACCESS));
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if (ret)
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return ret;
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} else if (namelen == SGI_ACL_DEFAULT_SIZE &&
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strncmp(name, SGI_ACL_DEFAULT,
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SGI_ACL_DEFAULT_SIZE) == 0) {
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int ret = __xfs_xattr_put_listent(
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context, XATTR_SYSTEM_PREFIX,
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XATTR_SYSTEM_PREFIX_LEN,
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XATTR_POSIX_ACL_DEFAULT,
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strlen(XATTR_POSIX_ACL_DEFAULT));
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if (ret)
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return ret;
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}
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#endif
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arraytop = context->count + prefix_len + namelen + 1;
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if (arraytop > context->firstu) {
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context->count = -1; /* insufficient space */
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return 1;
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/*
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* Only show root namespace entries if we are actually allowed to
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* see them.
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*/
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if (!capable(CAP_SYS_ADMIN))
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return 0;
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prefix = XATTR_TRUSTED_PREFIX;
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prefix_len = XATTR_TRUSTED_PREFIX_LEN;
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} else if (flags & XFS_ATTR_SECURE) {
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prefix = XATTR_SECURITY_PREFIX;
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prefix_len = XATTR_SECURITY_PREFIX_LEN;
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} else {
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prefix = XATTR_USER_PREFIX;
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prefix_len = XATTR_USER_PREFIX_LEN;
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}
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offset = (char *)context->alist + context->count;
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strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
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offset += prefix_len;
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strncpy(offset, (char *)name, namelen); /* real name */
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offset += namelen;
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*offset = '\0';
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context->count += prefix_len + namelen + 1;
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return 0;
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}
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static int
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xfs_xattr_put_listent_sizes(
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struct xfs_attr_list_context *context,
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int flags,
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unsigned char *name,
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int namelen,
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int valuelen,
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unsigned char *value)
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{
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context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
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return 0;
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}
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static int
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list_one_attr(const char *name, const size_t len, void *data,
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size_t size, ssize_t *result)
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{
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char *p = data + *result;
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*result += len;
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if (!size)
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return 0;
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if (*result > size)
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return -ERANGE;
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strcpy(p, name);
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return 0;
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return __xfs_xattr_put_listent(context, prefix, prefix_len, name,
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namelen);
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}
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ssize_t
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@ -221,7 +226,6 @@ xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
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struct xfs_attr_list_context context;
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struct attrlist_cursor_kern cursor = { 0 };
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struct inode *inode = d_inode(dentry);
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int error;
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/*
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* First read the regular on-disk attributes.
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@ -230,37 +234,14 @@ xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
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context.dp = XFS_I(inode);
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context.cursor = &cursor;
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context.resynch = 1;
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context.alist = data;
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context.alist = size ? data : NULL;
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context.bufsize = size;
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context.firstu = context.bufsize;
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if (size)
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context.put_listent = xfs_xattr_put_listent;
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else
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context.put_listent = xfs_xattr_put_listent_sizes;
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context.put_listent = xfs_xattr_put_listent;
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xfs_attr_list_int(&context);
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if (context.count < 0)
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return -ERANGE;
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/*
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* Then add the two synthetic ACL attributes.
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*/
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if (posix_acl_access_exists(inode)) {
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error = list_one_attr(XATTR_NAME_POSIX_ACL_ACCESS,
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strlen(XATTR_NAME_POSIX_ACL_ACCESS) + 1,
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data, size, &context.count);
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if (error)
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return error;
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}
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if (posix_acl_default_exists(inode)) {
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error = list_one_attr(XATTR_NAME_POSIX_ACL_DEFAULT,
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strlen(XATTR_NAME_POSIX_ACL_DEFAULT) + 1,
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data, size, &context.count);
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if (error)
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return error;
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}
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return context.count;
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}
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