Author: mjg
Date: Wed Aug 5 07:28:51 2020
New Revision: 363881
URL: https://svnweb.freebsd.org/changeset/base/363881
Log:
vfs: prefill nameidata with garbage on debug kernels
Modified:
head/sys/sys/namei.h
Modified: head/sys/sys/namei.h
==============================================================================
--- head/sys/sys/namei.h Wed Aug 5 05:58:25 2020 (r363880)
+++ head/sys/sys/namei.h Wed Aug 5 07:28:51 2020 (r363881)
@@ -196,11 +196,21 @@ int cache_fplookup(struct nameidata *ndp, enum
cache_f
#define NDINIT_ATVP(ndp, op, flags, segflg, namep, vp, td)
\
NDINIT_ALL(ndp, op, flags, segflg, namep, AT_FDCWD, vp, &cap_no_rights,
td)
+/*
+ * Note the constant pattern may *hide* bugs.
+ */
+#ifdef INVARIANTS
+#define NDINIT_PREFILL(arg) memset(arg, 0xff, sizeof(*arg))
+#else
+#define NDINIT_PREFILL(arg) do { } while (0)
+#endif
+
#define NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, startdir, rightsp,
td) \
do {
\
struct nameidata *_ndp = (ndp);
\
cap_rights_t *_rightsp = (rightsp);
\
MPASS(_rightsp != NULL);
\
+ NDINIT_PREFILL(_ndp);
\
_ndp->ni_cnd.cn_nameiop = op;
\
_ndp->ni_cnd.cn_flags = flags;
\
_ndp->ni_segflg = segflg;
\
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