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vfs: prefill nameidata with garbage on debug kernels

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This commit is contained in:
Mateusz Guzik 2020-08-05 07:28:51 +00:00
parent 096761378c
commit 9c9f7b7c95
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363881
1 changed files with 10 additions and 0 deletions
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10
sys/sys/namei.h
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@ -196,11 +196,21 @@ int cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
#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; \