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diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -2610,11 +2610,13 @@
int structsize;
p = arg;
- size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
+ size = sizeof(structsize) +
+ (1 + p->p_ucred->cr_ngroups) * sizeof(gid_t);
if (sb != NULL) {
KASSERT(*sizep == size, ("invalid size"));
structsize = sizeof(gid_t);
sbuf_bcat(sb, &structsize, sizeof(structsize));
+ sbuf_bcat(sb, &p->p_ucred->cr_gid, sizeof(gid_t));
sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
sizeof(gid_t));
}

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