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Erase kernel PTEs in pmap_page_protect4m(). This bug would leave spurious 

entries in the kernel address space, eventually leading to panics in
pv_unlink().   This takes care of PRs 3575 & 3703.
This commit is contained in:
pk 1997-06-12 19:14:28 +00:00
parent aabc4f2396
commit 0bf9195444
1 changed files with 31 additions and 27 deletions
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58
sys/arch/sparc/sparc/pmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.82 1997/05/24 20:09:45 pk Exp $ */
/* $NetBSD: pmap.c,v 1.83 1997/06/12 19:14:28 pk Exp $ */
/*
* Copyright (c) 1996
@ -4688,42 +4688,46 @@ pmap_page_protect4m(pa, prot)
flags |= MR4M(tpte);
if (nleft)
if (nleft) {
setpgt4m(&sp->sg_pte[VA_SUN4M_VPG(va)], SRMMU_TEINVALID);
else {
if (pm == pmap_kernel()) {
tlb_flush_segment(vr, vs); /* Paranoid? */
if (va < virtual_avail) {
goto nextpv;
}
/* Entire segment is gone */
if (pm == pmap_kernel()) {
tlb_flush_segment(vr, vs); /* Paranoid? */
setpgt4m(&sp->sg_pte[VA_SUN4M_VPG(va)], SRMMU_TEINVALID);
if (va < virtual_avail) {
#ifdef DEBUG
printf(
"pmap_page_protect: attempt to free"
" base kernel allocation\n");
printf(
"pmap_page_protect: attempt to free"
" base kernel allocation\n");
#endif
goto nextpv;
}
goto nextpv;
}
#if 0 /* no need for this */
/* no need to free the table; it is static */
qzero(sp->sg_pte, SRMMU_L3SIZE * sizeof(int));
/* no need to free the table; it is static */
qzero(sp->sg_pte, SRMMU_L3SIZE * sizeof(int));
#endif
/* if we're done with a region, leave it */
/* if we're done with a region, leave it */
} else { /* User mode mapping */
if (pm->pm_ctx)
tlb_flush_segment(vr, vs);
setpgt4m(&rp->rg_seg_ptps[vs], SRMMU_TEINVALID);
free(sp->sg_pte, M_VMPMAP);
sp->sg_pte = NULL;
} else { /* User mode mapping */
if (pm->pm_ctx)
tlb_flush_segment(vr, vs);
setpgt4m(&rp->rg_seg_ptps[vs], SRMMU_TEINVALID);
free(sp->sg_pte, M_VMPMAP);
sp->sg_pte = NULL;
if (--rp->rg_nsegmap == 0) {
free(rp->rg_segmap, M_VMPMAP);
rp->rg_segmap = NULL;
free(rp->rg_seg_ptps, M_VMPMAP);
setpgt4m(&pm->pm_reg_ptps[vr],
SRMMU_TEINVALID);
}
if (--rp->rg_nsegmap == 0) {
free(rp->rg_segmap, M_VMPMAP);
rp->rg_segmap = NULL;
free(rp->rg_seg_ptps, M_VMPMAP);
setpgt4m(&pm->pm_reg_ptps[vr],
SRMMU_TEINVALID);
}
}
nextpv:
npv = pv->pv_next;
if (pv != pv0)