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Date:      Mon, 30 Jan 2012 07:56:00 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r230767 - in head/sys: i386/i386 kern powerpc/aim powerpc/booke
Message-ID:  <201201300756.q0U7u0d6073908@svn.freebsd.org>
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Author: kib
Date: Mon Jan 30 07:56:00 2012
New Revision: 230767
URL: http://svn.freebsd.org/changeset/base/230767

Log:
  Finally, try to enable the nxstacks on amd64 and powerpc64 for both 64bit
  and 32bit ABIs. Also try to enable nxstacks for PAE/i386 when supported,
  and some variants of powerpc32.
  
  MFC after:	2 months (if ever)

Modified:
  head/sys/i386/i386/initcpu.c
  head/sys/kern/imgact_elf.c
  head/sys/powerpc/aim/mmu_oea64.c
  head/sys/powerpc/booke/machdep.c

Modified: head/sys/i386/i386/initcpu.c
==============================================================================
--- head/sys/i386/i386/initcpu.c	Mon Jan 30 07:53:33 2012	(r230766)
+++ head/sys/i386/i386/initcpu.c	Mon Jan 30 07:56:00 2012	(r230767)
@@ -650,6 +650,8 @@ enable_sse(void)
 #endif
 }
 
+extern int elf32_nxstack;
+
 void
 initializecpu(void)
 {
@@ -739,6 +741,7 @@ initializecpu(void)
 			msr = rdmsr(MSR_EFER) | EFER_NXE;
 			wrmsr(MSR_EFER, msr);
 			pg_nx = PG_NX;
+			elf32_nxstack = 1;
 		}
 #endif
 		break;

Modified: head/sys/kern/imgact_elf.c
==============================================================================
--- head/sys/kern/imgact_elf.c	Mon Jan 30 07:53:33 2012	(r230766)
+++ head/sys/kern/imgact_elf.c	Mon Jan 30 07:56:00 2012	(r230767)
@@ -118,7 +118,12 @@ static int elf_legacy_coredump = 0;
 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 
     &elf_legacy_coredump, 0, "");
 
-static int __elfN(nxstack) = 0;
+int __elfN(nxstack) =
+#if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */
+	1;
+#else
+	0;
+#endif
 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
     nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");

Modified: head/sys/powerpc/aim/mmu_oea64.c
==============================================================================
--- head/sys/powerpc/aim/mmu_oea64.c	Mon Jan 30 07:53:33 2012	(r230766)
+++ head/sys/powerpc/aim/mmu_oea64.c	Mon Jan 30 07:56:00 2012	(r230767)
@@ -1445,6 +1445,8 @@ moea64_uma_page_alloc(uma_zone_t zone, i
 	return (void *)va;
 }
 
+extern int elf32_nxstack;
+
 void
 moea64_init(mmu_t mmu)
 {
@@ -1464,6 +1466,8 @@ moea64_init(mmu_t mmu)
 		uma_zone_set_allocf(moea64_mpvo_zone,moea64_uma_page_alloc);
 	}
 
+	elf32_nxstack = 1;
+
 	moea64_initialized = TRUE;
 }
 

Modified: head/sys/powerpc/booke/machdep.c
==============================================================================
--- head/sys/powerpc/booke/machdep.c	Mon Jan 30 07:53:33 2012	(r230766)
+++ head/sys/powerpc/booke/machdep.c	Mon Jan 30 07:56:00 2012	(r230767)
@@ -192,6 +192,8 @@ void print_kernel_section_addr(void);
 void print_kenv(void);
 u_int booke_init(uint32_t, uint32_t);
 
+extern int elf32_nxstack;
+
 static void
 cpu_e500_startup(void *dummy)
 {
@@ -227,6 +229,9 @@ cpu_e500_startup(void *dummy)
 	/* Set up buffers, so they can be used to read disk labels. */
 	bufinit();
 	vm_pager_bufferinit();
+
+	/* Cpu supports execution permissions on the pages. */
+	elf32_nxstack = 1;
 }
 
 static char *

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