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D52259.id.diff
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diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -1112,13 +1112,14 @@
if (cred->cr_flags & CRED_FLAG_CAPMODE)
kp->ki_cr_flags |= KI_CRF_CAPABILITY_MODE;
/* XXX bde doesn't like KI_NGROUPS */
- if (cred->cr_ngroups > KI_NGROUPS) {
+ if (1 + cred->cr_ngroups > KI_NGROUPS) {
kp->ki_ngroups = KI_NGROUPS;
kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
} else
- kp->ki_ngroups = cred->cr_ngroups;
- bcopy(cred->cr_groups, kp->ki_groups,
- kp->ki_ngroups * sizeof(gid_t));
+ kp->ki_ngroups = 1 + cred->cr_ngroups;
+ kp->ki_groups[0] = cred->cr_gid;
+ bcopy(cred->cr_groups, kp->ki_groups + 1,
+ (kp->ki_ngroups - 1) * sizeof(gid_t));
kp->ki_rgid = cred->cr_rgid;
kp->ki_svgid = cred->cr_svgid;
/* If jailed(cred), emulate the old P_JAILED flag. */

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