[PATCH 04/19] staging/lustre/llite: strengthen checks for hsm flags and archive id

[green@linuxhacker.ru]

From: Bruno Faccini <bruno.faccini@intel.com>

Prior to this patch undefined flags bits and out of range
archive id can be set.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Reviewed-on: http://review.whamcloud.com/13337
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5757
Reviewed-by: frank zago <fzago@cray.com>
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
---
 drivers/staging/lustre/lustre/include/lustre/lustre_idl.h | 7 +++++++
 drivers/staging/lustre/lustre/llite/file.c                | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
index e79af19..9416d95 100644
--- a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
+++ b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
@@ -365,6 +365,13 @@ static inline __u64 fid_ver_oid(const struct lu_fid *fid)
 	return ((__u64)fid_ver(fid) << 32 | fid_oid(fid));
 }
 
+/* copytool uses a 32b bitmask field to encode archive-Ids during register
+ * with MDT thru kuc.
+ * archive num = 0 => all
+ * archive num from 1 to 32
+ */
+#define LL_HSM_MAX_ARCHIVE (sizeof(__u32) * 8)
+
 /**
  * Note that reserved SEQ numbers below 12 will conflict with ldiskfs
  * inodes in the IGIF namespace, so these reserved SEQ numbers can be
diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index e332326..b610032 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -2118,12 +2118,21 @@ static int ll_hsm_state_set(struct inode *inode, struct hsm_state_set *hss)
 	struct md_op_data	*op_data;
 	int			 rc;
 
+	/* Detect out-of range masks */
+	if ((hss->hss_setmask | hss->hss_clearmask) & ~HSM_FLAGS_MASK)
+		return -EINVAL;
+
 	/* Non-root users are forbidden to set or clear flags which are
 	 * NOT defined in HSM_USER_MASK. */
 	if (((hss->hss_setmask | hss->hss_clearmask) & ~HSM_USER_MASK) &&
 	    !capable(CFS_CAP_SYS_ADMIN))
 		return -EPERM;
 
+	/* Detect out-of range archive id */
+	if ((hss->hss_valid & HSS_ARCHIVE_ID) &&
+	    (hss->hss_archive_id > LL_HSM_MAX_ARCHIVE))
+		return -EINVAL;
+
 	op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
 				     LUSTRE_OPC_ANY, hss);
 	if (IS_ERR(op_data))
-- 
2.1.0