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Handle the randomly placed direct map

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ok mlarkin
This commit is contained in:
deraadt
2026-06-04 05:25:04 +00:00
parent a36bbdd351
commit bd3e85e0af
1 changed files with 26 additions and 3 deletions
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lib/libkvm/kvm_amd64.c
+26 -3
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@@ -1,4 +1,4 @@
/* $OpenBSD: kvm_amd64.c,v 1.16 2023/03/08 04:43:05 guenther Exp $ */
/* $OpenBSD: kvm_amd64.c,v 1.17 2026/06/04 05:25:04 deraadt Exp $ */
/* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */
/*-
@@ -68,9 +68,32 @@ _kvm_freevtop(kvm_t *kd)
kd->vmst = NULL;
}
vaddr_t pmap_direct_base;
vaddr_t pmap_direct_end;
int
_kvm_initvtop(kvm_t *kd)
{
struct nlist nl[3];
nl[0].n_name = "_pmap_direct_base";
nl[1].n_name = "_pmap_direct_end";
nl[2].n_name = NULL;
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (_kvm_pread(kd, kd->pmfd, &pmap_direct_base,
sizeof pmap_direct_base,
_kvm_pa2off(kd, nl[0].n_value)) != sizeof pmap_direct_base)
return (-1);
if (_kvm_pread(kd, kd->pmfd, &pmap_direct_end,
sizeof pmap_direct_end,
_kvm_pa2off(kd, nl[1].n_value)) != sizeof pmap_direct_end)
return (-1);
return (0);
}
@@ -94,8 +117,8 @@ _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
page_off = va & (kd->nbpg - 1);
if (va >= PMAP_DIRECT_BASE && va <= PMAP_DIRECT_END) {
*pa = va - PMAP_DIRECT_BASE;
if (va >= pmap_direct_base && va <= pmap_direct_end) {
*pa = va - pmap_direct_base;
return (int)(kd->nbpg - page_off);
}