mmap_is_ia32 always true for X86_32, or while emulating IA32 on X86_64
Randomization not supported on X86_32 in legacy layout. Both layouts allow
randomization on X86_64.
Signed-off-by: Harvey Harrison <[email protected]>
---
Applies against the mm branch of the x86 tree which has Jiri's PIE rework included.
arch/x86/mm/Makefile_32 | 2 +-
arch/x86/mm/Makefile_64 | 3 +-
arch/x86/mm/mmap.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++
arch/x86/mm/mmap_32.c | 81 -------------------------------
arch/x86/mm/mmap_64.c | 116 --------------------------------------------
5 files changed, 125 insertions(+), 200 deletions(-)
diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32
index 362b4ad..a01aca7 100644
--- a/arch/x86/mm/Makefile_32
+++ b/arch/x86/mm/Makefile_32
@@ -2,7 +2,7 @@
# Makefile for the linux i386-specific parts of the memory manager.
#
-obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap_32.o
+obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap.o
obj-$(CONFIG_NUMA) += discontig_32.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/arch/x86/mm/Makefile_64 b/arch/x86/mm/Makefile_64
index d18baed..b5a7448 100644
--- a/arch/x86/mm/Makefile_64
+++ b/arch/x86/mm/Makefile_64
@@ -2,9 +2,8 @@
# Makefile for the linux x86_64-specific parts of the memory manager.
#
-obj-y := init_64.o fault_64.o ioremap_64.o extable_64.o pageattr_64.o mmap_64.o
+obj-y := init_64.o fault_64.o ioremap_64.o extable_64.o pageattr_64.o mmap.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa_64.o
obj-$(CONFIG_K8_NUMA) += k8topology_64.o
obj-$(CONFIG_ACPI_NUMA) += srat_64.o
-obj-$(CONFIG_IA32_EMULATION) += mmap_32.o
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
new file mode 100644
index 0000000..e3fddda
--- /dev/null
+++ b/arch/x86/mm/mmap.c
@@ -0,0 +1,123 @@
+/*
+ * Flexible mmap layout support
+ *
+ * Based on code by Ingo Molnar and Andi Kleen, copyrighted
+ * as follows:
+ *
+ * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
+ * All Rights Reserved.
+ * Copyright 2005 Andi Kleen, SUSE Labs.
+ * Copyright 2007 Jiri Kosina, SUSE Labs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/personality.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/limits.h>
+#include <linux/sched.h>
+
+/*
+ * Top of mmap area (just below the process stack).
+ *
+ * Leave an at least ~128 MB hole.
+ */
+#define MIN_GAP (128*1024*1024)
+#define MAX_GAP (TASK_SIZE/6*5)
+
+/*
+ * True on X86_32 or when emulating IA32 on X86_64
+ */
+static int mmap_is_ia32(void)
+{
+#ifdef X86_32
+ return 1;
+#endif
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32))
+ return 1;
+#endif
+ return 0;
+}
+
+static int mmap_is_legacy(void)
+{
+ if (current->personality & ADDR_COMPAT_LAYOUT)
+ return 1;
+
+ if (current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY)
+ return 1;
+
+ return sysctl_legacy_va_layout;
+}
+
+static unsigned long mmap_rnd(void)
+{
+ unsigned long rnd = 0;
+
+ /*
+ * 8 bits of randomness in 32bit mmaps, 20 address space bits
+ * 28 bits of randomness in 64bit mmaps, 40 address space bits
+ */
+ if (current->flags & PF_RANDOMIZE) {
+ if (mmap_is_ia32())
+ rnd = (long)get_random_int() % (1<<8);
+ else
+ rnd = (long)(get_random_int() % (1<<28));
+ }
+ return rnd << PAGE_SHIFT;
+}
+
+static unsigned long mmap_base(void)
+{
+ unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
+
+ if (gap < MIN_GAP)
+ gap = MIN_GAP;
+ else if (gap > MAX_GAP)
+ gap = MAX_GAP;
+
+ return PAGE_ALIGN(TASK_SIZE - gap - mmap_rnd());
+}
+
+/*
+ * Bottom-up (legacy) layout on X86_32 did not support randomization, X86_64
+ * does, but not when emulating X86_32
+ */
+static unsigned long mmap_legacy_base(void)
+{
+ if (mmap_is_ia32())
+ return TASK_UNMAPPED_BASE;
+ else
+ return TASK_UNMAPPED_BASE + mmap_rnd();
+}
+
+/*
+ * This function, called very early during the creation of a new
+ * process VM image, sets up which VM layout function to use:
+ */
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+ if (mmap_is_legacy()) {
+ mm->mmap_base = mmap_legacy_base();
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ mm->unmap_area = arch_unmap_area;
+ } else {
+ mm->mmap_base = mmap_base();
+ mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ mm->unmap_area = arch_unmap_area_topdown;
+ }
+}
diff --git a/arch/x86/mm/mmap_32.c b/arch/x86/mm/mmap_32.c
deleted file mode 100644
index d490662..0000000
--- a/arch/x86/mm/mmap_32.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * linux/arch/i386/mm/mmap.c
- *
- * flexible mmap layout support
- *
- * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
- * Started by Ingo Molnar <[email protected]>
- */
-
-#include <linux/personality.h>
-#include <linux/mm.h>
-#include <linux/random.h>
-#include <linux/sched.h>
-
-/*
- * Top of mmap area (just below the process stack).
- *
- * Leave an at least ~128 MB hole.
- */
-#define MIN_GAP (128*1024*1024)
-#define MAX_GAP (TASK_SIZE/6*5)
-
-static inline unsigned long mmap_base(struct mm_struct *mm)
-{
- unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
- unsigned long random_factor = 0;
-
- if (current->flags & PF_RANDOMIZE)
- random_factor = get_random_int() % (1024*1024);
-
- if (gap < MIN_GAP)
- gap = MIN_GAP;
- else if (gap > MAX_GAP)
- gap = MAX_GAP;
-
- return PAGE_ALIGN(TASK_SIZE - gap - random_factor);
-}
-
-/*
- * This function, called very early during the creation of a new
- * process VM image, sets up which VM layout function to use:
- */
-#ifdef CONFIG_X86_32
-void arch_pick_mmap_layout(struct mm_struct *mm)
-#else
-void ia32_pick_mmap_layout(struct mm_struct *mm)
-#endif
-{
- /*
- * Fall back to the standard layout if the personality
- * bit is set, or if the expected stack growth is unlimited:
- */
- if (sysctl_legacy_va_layout ||
- (current->personality & ADDR_COMPAT_LAYOUT) ||
- current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) {
- mm->mmap_base = TASK_UNMAPPED_BASE;
- mm->get_unmapped_area = arch_get_unmapped_area;
- mm->unmap_area = arch_unmap_area;
- } else {
- mm->mmap_base = mmap_base(mm);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
- mm->unmap_area = arch_unmap_area_topdown;
- }
-}
diff --git a/arch/x86/mm/mmap_64.c b/arch/x86/mm/mmap_64.c
deleted file mode 100644
index 119bf34..0000000
--- a/arch/x86/mm/mmap_64.c
+++ /dev/null
@@ -1,116 +0,0 @@
-/*
- * linux/arch/x86-64/mm/mmap.c
- *
- * flexible mmap layout support
- *
- * Based on code by Ingo Molnar and Andi Kleen, copyrighted
- * as follows:
- *
- * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
- * All Rights Reserved.
- * Copyright 2005 Andi Kleen, SUSE Labs.
- * Copyright 2007 Jiri Kosina, SUSE Labs.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-#include <linux/personality.h>
-#include <linux/mm.h>
-#include <linux/random.h>
-#include <linux/limits.h>
-#include <linux/sched.h>
-#include <asm/ia32.h>
-
-/*
- * Top of mmap area (just below the process stack).
- *
- * Leave an at least ~128 MB hole.
- */
-#define MIN_GAP (128*1024*1024)
-#define MAX_GAP (TASK_SIZE/6*5)
-
-static unsigned long mmap_base(void)
-{
- unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
-
- if (gap < MIN_GAP)
- gap = MIN_GAP;
- else if (gap > MAX_GAP)
- gap = MAX_GAP;
-
- return TASK_SIZE - (gap & PAGE_MASK);
-}
-
-static int mmap_is_32(void)
-{
-#ifdef CONFIG_IA32_EMULATION
- if (test_thread_flag(TIF_IA32))
- return 1;
-#endif
- return 0;
-}
-
-static int mmap_is_legacy(void)
-{
- if (current->personality & ADDR_COMPAT_LAYOUT)
- return 1;
-
- if (current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY)
- return 1;
-
- return sysctl_legacy_va_layout;
-}
-
-/*
- * This function, called very early during the creation of a new
- * process VM image, sets up which VM layout function to use:
- */
-void arch_pick_mmap_layout(struct mm_struct *mm)
-{
- int rnd = 0;
- if (current->flags & PF_RANDOMIZE) {
- /*
- * Add 28bit randomness which is about 40bits of address space
- * because mmap base has to be page aligned.
- * or ~1/128 of the total user VM
- * (total user address space is 47bits)
- */
- rnd = get_random_int() & 0xfffffff;
- }
-
- /*
- * Fall back to the standard layout if the personality
- * bit is set, or if the expected stack growth is unlimited:
- */
- if (mmap_is_32()) {
-#ifdef CONFIG_IA32_EMULATION
- /* ia32_pick_mmap_layout has its own. */
- return ia32_pick_mmap_layout(mm);
-#endif
- } else if (mmap_is_legacy()) {
- mm->mmap_base = TASK_UNMAPPED_BASE;
- mm->get_unmapped_area = arch_get_unmapped_area;
- mm->unmap_area = arch_unmap_area;
- } else {
- mm->mmap_base = mmap_base();
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
- mm->unmap_area = arch_unmap_area_topdown;
- if (current->flags & PF_RANDOMIZE)
- rnd = -rnd;
- }
- if (current->flags & PF_RANDOMIZE)
- mm->mmap_base += ((long)rnd) << PAGE_SHIFT;
-}
--
1.5.3.7.2212.gd092
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
