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authorAndreas Gruenbacher <agruenba@redhat.com>2015-12-02 14:44:39 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-06 21:34:15 -0500
commit786534b92f3ce68f4afc8a761c80b76887797b0a (patch)
tree569a3d59a37cae008a4c86e9e78c4aa7b5a4e2c2
parentaa7c5241c380adb7e6913549292c1b83c1469bda (diff)
downloadlinux-786534b92f3ce68f4afc8a761c80b76887797b0a.tar.bz2
tmpfs: listxattr should include POSIX ACL xattrs
When a file on tmpfs has an ACL or a Default ACL, listxattr should include the corresponding xattr name. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: James Morris <james.l.morris@oracle.com> Cc: Hugh Dickins <hughd@google.com> Cc: linux-mm@kvack.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/kernfs/inode.c2
-rw-r--r--fs/xattr.c53
-rw-r--r--include/linux/xattr.h3
-rw-r--r--mm/shmem.c2
4 files changed, 41 insertions, 19 deletions
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index f97e1f7790b1..16405ae88d2d 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -230,7 +230,7 @@ ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
if (!attrs)
return -ENOMEM;
- return simple_xattr_list(&attrs->xattrs, buf, size);
+ return simple_xattr_list(d_inode(dentry), &attrs->xattrs, buf, size);
}
static inline void set_default_inode_attr(struct inode *inode, umode_t mode)
diff --git a/fs/xattr.c b/fs/xattr.c
index 4ef8b378dc90..c3af6c9670cb 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -921,38 +921,59 @@ static bool xattr_is_trusted(const char *name)
return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN);
}
+static int xattr_list_one(char **buffer, ssize_t *remaining_size,
+ const char *name)
+{
+ size_t len = strlen(name) + 1;
+ if (*buffer) {
+ if (*remaining_size < len)
+ return -ERANGE;
+ memcpy(*buffer, name, len);
+ *buffer += len;
+ }
+ *remaining_size -= len;
+ return 0;
+}
+
/*
* xattr LIST operation for in-memory/pseudo filesystems
*/
-ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
- size_t size)
+ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
+ char *buffer, size_t size)
{
bool trusted = capable(CAP_SYS_ADMIN);
struct simple_xattr *xattr;
- size_t used = 0;
+ ssize_t remaining_size = size;
+ int err;
+
+#ifdef CONFIG_FS_POSIX_ACL
+ if (inode->i_acl) {
+ err = xattr_list_one(&buffer, &remaining_size,
+ XATTR_NAME_POSIX_ACL_ACCESS);
+ if (err)
+ return err;
+ }
+ if (inode->i_default_acl) {
+ err = xattr_list_one(&buffer, &remaining_size,
+ XATTR_NAME_POSIX_ACL_DEFAULT);
+ if (err)
+ return err;
+ }
+#endif
spin_lock(&xattrs->lock);
list_for_each_entry(xattr, &xattrs->head, list) {
- size_t len;
-
/* skip "trusted." attributes for unprivileged callers */
if (!trusted && xattr_is_trusted(xattr->name))
continue;
- len = strlen(xattr->name) + 1;
- used += len;
- if (buffer) {
- if (size < used) {
- used = -ERANGE;
- break;
- }
- memcpy(buffer, xattr->name, len);
- buffer += len;
- }
+ err = xattr_list_one(&buffer, &remaining_size, xattr->name);
+ if (err)
+ return err;
}
spin_unlock(&xattrs->lock);
- return used;
+ return size - remaining_size;
}
/*
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 4dd40cb2c07b..d23ce8e9af6f 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -104,7 +104,8 @@ int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
void *buffer, size_t size);
int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
const void *value, size_t size, int flags);
-ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer, size_t size);
+ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
+ size_t size);
void simple_xattr_list_add(struct simple_xattrs *xattrs,
struct simple_xattr *new_xattr);
diff --git a/mm/shmem.c b/mm/shmem.c
index fdfe6c8dddfc..297390f4e50f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2606,7 +2606,7 @@ static const struct xattr_handler *shmem_xattr_handlers[] = {
static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
struct shmem_inode_info *info = SHMEM_I(d_inode(dentry));
- return simple_xattr_list(&info->xattrs, buffer, size);
+ return simple_xattr_list(d_inode(dentry), &info->xattrs, buffer, size);
}
#endif /* CONFIG_TMPFS_XATTR */