Author: freqlabs Date: Mon May 11 15:38:44 2020 New Revision: 360900 URL: https://svnweb.freebsd.org/changeset/base/360900
Log: vfs_exports: Tighten bounds and assert consistency of numsecflavors We know the value must be greater than 0 and less than MAXSECFLAVORS. Reject values outside this range in the initial check in vfs_export and add KASSERTs in the later consumers. Also check that we are called with one of either MNT_DELEXPORT or MNT_EXPORTED set. Reviewed by: rmacklem Approved by: mav (mentor) MFC after: 1 week Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D24753 Modified: head/sys/kern/vfs_export.c Modified: head/sys/kern/vfs_export.c ============================================================================== --- head/sys/kern/vfs_export.c Mon May 11 15:32:32 2020 (r360899) +++ head/sys/kern/vfs_export.c Mon May 11 15:38:44 2020 (r360900) @@ -112,6 +112,11 @@ vfs_hang_addrlist(struct mount *mp, struct netexport * #endif int error; + KASSERT(argp->ex_numsecflavors > 0, + ("%s: numsecflavors <= 0", __func__)); + KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS, + ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); + /* * XXX: This routine converts from a `struct xucred' * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This @@ -300,10 +305,14 @@ vfs_export(struct mount *mp, struct export_args *argp) struct netexport *nep; int error; - if (argp->ex_numsecflavors < 0 - || argp->ex_numsecflavors >= MAXSECFLAVORS) + if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0) return (EINVAL); + if ((argp->ex_flags & MNT_EXPORTED) != 0 && + (argp->ex_numsecflavors <= 0 + || argp->ex_numsecflavors >= MAXSECFLAVORS)) + return (EINVAL); + error = 0; lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL); nep = mp->mnt_export; @@ -518,8 +527,13 @@ vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam *extflagsp = np->netc_exflags; if ((*credanonp = np->netc_anon) != NULL) crhold(*credanonp); - if (numsecflavors) + if (numsecflavors) { *numsecflavors = np->netc_numsecflavors; + KASSERT(*numsecflavors > 0, + ("%s: numsecflavors <= 0", __func__)); + KASSERT(*numsecflavors < MAXSECFLAVORS, + ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); + } if (secflavors) *secflavors = np->netc_secflavors; lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
