LU-5832 utils: Fix buffer overflow in bound string copy

The function 'strncpy' may incorrectly check buffer boundaries
and may overflow buffer 'info->name' of fixed size (256). Also
there is one similar error on line 1135.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I512ab6678fbf1d02bac2eb290fd13c22fca9dc2b
Reviewed-on: http://review.whamcloud.com/12516
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/utils/lustre_rsync.c b/lustre/utils/lustre_rsync.c
index 8fb2734..04b6c22 100644 (file)
--- a/lustre/utils/lustre_rsync.c
+++ b/lustre/utils/lustre_rsync.c
@@ -1113,17 +1113,21 @@ int lr_parse_line(void *priv, struct lr_info *info)
 {
        struct changelog_rec            *rec;
        struct changelog_ext_rename     *rnm;
+       size_t                           namelen;
+       size_t                           copylen;
 
-        if (llapi_changelog_recv(priv, &rec) != 0)
-                return -1;
+       if (llapi_changelog_recv(priv, &rec) != 0)
+               return -1;
 
        info->is_extended = !!(rec->cr_flags & CLF_RENAME);
-        info->recno = rec->cr_index;
-        info->type = rec->cr_type;
-        sprintf(info->tfid, DFID, PFID(&rec->cr_tfid));
-        sprintf(info->pfid, DFID, PFID(&rec->cr_pfid));
-       strncpy(info->name, changelog_rec_name(rec), rec->cr_namelen);
-       info->name[rec->cr_namelen] = '\0';
+       info->recno = rec->cr_index;
+       info->type = rec->cr_type;
+       snprintf(info->tfid, sizeof(info->tfid), DFID, PFID(&rec->cr_tfid));
+       snprintf(info->pfid, sizeof(info->pfid), DFID, PFID(&rec->cr_pfid));
+
+       namelen = strnlen(changelog_rec_name(rec), rec->cr_namelen);
+       copylen = min(sizeof(info->name), namelen + 1);
+       strlcpy(info->name, changelog_rec_name(rec), copylen);
 
        /* Don't use rnm if CLF_RENAME isn't set */
        rnm = changelog_rec_rename(rec);
@@ -1132,9 +1136,9 @@ int lr_parse_line(void *priv, struct lr_info *info)
                         PFID(&rnm->cr_sfid));
                snprintf(info->spfid, sizeof(info->spfid), DFID,
                         PFID(&rnm->cr_spfid));
-               strncpy(info->sname, changelog_rec_sname(rec),
-                       changelog_rec_snamelen(rec));
-               info->sname[changelog_rec_snamelen(rec)] = '\0';
+               namelen = changelog_rec_snamelen(rec);
+               copylen = min(sizeof(info->sname), namelen + 1);
+               strlcpy(info->sname, changelog_rec_sname(rec), copylen);
 
                if (verbose > 1)
                        printf("Rec %lld: %d %s %s\n", info->recno, info->type,