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Fix a well duplicated fencepost error that stopped crashdumps being

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readable on certain random memory configurations.  If the libkvm consumer
tried to read something that was in the very last pdpe, pde or pte slot,
it would bogusly fail.

This is broken in RELENG_6 too.
This commit is contained in:
Peter Wemm 2005-10-20 05:41:38 +00:00
parent 72699a2216
commit add112ff65
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151492
2 changed files with 7 additions and 7 deletions
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6
lib/libkvm/kvm_amd64.c
View file

@ -241,7 +241,7 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
(pdpeindex * sizeof(pdp_entry_t));
s = _kvm_pa2off(kd, pdpe_pa, &ofs);
if (s <= sizeof pdpe) {
if (s < sizeof pdpe) {
_kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
goto invalid;
}
@ -262,7 +262,7 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t));
s = _kvm_pa2off(kd, pde_pa, &ofs);
if (s <= sizeof pde) {
if (s < sizeof pde) {
_kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found");
goto invalid;
}
@ -299,7 +299,7 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t));
s = _kvm_pa2off(kd, pte_pa, &ofs);
if (s <= sizeof pte) {
if (s < sizeof pte) {
_kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found");
goto invalid;
}

8
lib/libkvm/kvm_i386.c
View file

@ -280,7 +280,7 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
#define PG_FRAME4M (~PAGE4M_MASK)
pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
s = _kvm_pa2off(kd, pde_pa, &ofs);
if (s <= sizeof pde) {
if (s < sizeof pde) {
_kvm_syserr(kd, kd->program,
"_kvm_vatop: pde_pa not found");
goto invalid;
@ -293,7 +293,7 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
s = _kvm_pa2off(kd, pte_pa, &ofs);
if (s <= sizeof pte) {
if (s < sizeof pte) {
_kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
goto invalid;
}
@ -376,7 +376,7 @@ _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
#define PG_FRAME2M (~PAGE2M_MASK)
pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
s = _kvm_pa2off(kd, pde_pa, &ofs);
if (s <= sizeof pde) {
if (s < sizeof pde) {
_kvm_syserr(kd, kd->program,
"_kvm_vatop_pae: pde_pa not found");
goto invalid;
@ -389,7 +389,7 @@ _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde));
s = _kvm_pa2off(kd, pte_pa, &ofs);
if (s <= sizeof pte) {
if (s < sizeof pte) {
_kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found");
goto invalid;
}