Date: Thu, 25 Mar 2010 17:24:03 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r205652 - head/sys/i386/i386 Message-ID: <201003251724.o2PHO3KC087681@svn.freebsd.org>
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Author: alc Date: Thu Mar 25 17:24:03 2010 New Revision: 205652 URL: http://svn.freebsd.org/changeset/base/205652 Log: A ptrace(2) by one processor may trigger a promotion in the address space of another process. Modify pmap_promote_pde() to handle this. (This is not a problem on amd64 due to implementation differences.) Reported by: jh@ MFC after: 1 week Modified: head/sys/i386/i386/pmap.c Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Thu Mar 25 17:17:35 2010 (r205651) +++ head/sys/i386/i386/pmap.c Thu Mar 25 17:24:03 2010 (r205652) @@ -3154,7 +3154,7 @@ pmap_promote_pde(pmap_t pmap, pd_entry_t * either invalid, unused, or does not map the first 4KB physical page * within a 2- or 4MB page. */ - firstpte = vtopte(trunc_4mpage(va)); + firstpte = pmap_pte_quick(pmap, trunc_4mpage(va)); setpde: newpde = *firstpte; if ((newpde & ((PG_FRAME & PDRMASK) | PG_A | PG_V)) != (PG_A | PG_V)) {
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