The patch titled
Subject: fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
has been added to the -mm tree. Its filename is
fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
Consolidate randomize_et_dyn() implementations into fs/binfmt_elf.c.
There doesn't seem to be a compile-time way of making randomize_et_dyn()
go away on architectures which don't need it, so mark it __weak to cause
it to be discarded at link time.
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Hector Marco Gisbert <hecmargi@xxxxxx>
Cc: Hector Marco-Gisbert <hecmargi@xxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ismael Ripoll <iripoll@xxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/include/asm/elf.h | 3 +--
arch/arm/mm/mmap.c | 13 ++-----------
arch/arm64/Kconfig | 2 +-
arch/arm64/include/asm/elf.h | 3 +--
arch/arm64/mm/mmap.c | 14 ++------------
arch/mips/include/asm/elf.h | 1 -
arch/mips/mm/mmap.c | 13 ++-----------
arch/powerpc/include/asm/elf.h | 2 --
arch/powerpc/mm/mmap.c | 13 ++-----------
arch/x86/include/asm/elf.h | 2 --
arch/x86/mm/mmap.c | 12 ++----------
fs/binfmt_elf.c | 21 +++++++++++++++++++++
include/linux/elf-randomization.h | 7 +++++++
13 files changed, 41 insertions(+), 65 deletions(-)
diff -puN arch/arm/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/arm/include/asm/elf.h
--- a/arch/arm/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/arm/include/asm/elf.h
@@ -2,7 +2,7 @@
#define __ASMARM_ELF_H
#include <asm/hwcap.h>
-
+#include <linux/elf-randomization.h>
/*
* ELF register definitions..
*/
@@ -115,7 +115,6 @@ int dump_task_regs(struct task_struct *t
the loader. We need to make sure that it is out of the way of the program
that it will "exec", and that there is sufficient room for the brk. */
-extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(2 * TASK_SIZE / 3))
/* When the program starts, a1 contains a pointer to a function to be
diff -puN arch/arm/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/arm/mm/mmap.c
--- a/arch/arm/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/arm/mm/mmap.c
@@ -7,6 +7,7 @@
#include <linux/shm.h>
#include <linux/sched.h>
#include <linux/io.h>
+#include <linux/elf-randomization.h>
#include <linux/personality.h>
#include <linux/random.h>
#include <asm/cachetype.h>
@@ -30,7 +31,7 @@ static int mmap_is_legacy(void)
return sysctl_legacy_va_layout;
}
-static unsigned long mmap_rnd(void)
+unsigned long mmap_rnd(void)
{
unsigned long rnd = 0;
@@ -241,13 +242,3 @@ int devmem_is_allowed(unsigned long pfn)
}
#endif
-
-unsigned long randomize_et_dyn(unsigned long base)
-{
- unsigned long ret;
- if ((current->personality & ADDR_NO_RANDOMIZE) ||
- !(current->flags & PF_RANDOMIZE))
- return base;
- ret = base + mmap_rnd();
- return (ret > base) ? ret : base;
-}
diff -puN arch/arm64/Kconfig~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/arm64/Kconfig
--- a/arch/arm64/Kconfig~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/arm64/Kconfig
@@ -1,4 +1,4 @@
-config ARM64
+qconfig ARM64
def_bool y
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_GCOV_PROFILE_ALL
diff -puN arch/arm64/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/arm64/include/asm/elf.h
--- a/arch/arm64/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/arm64/include/asm/elf.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 20q12 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -125,7 +125,6 @@ typedef struct user_fpsimd_state elf_fpr
* the loader. We need to make sure that it is out of the way of the program
* that it will "exec", and that there is sufficient room for the brk.
*/
-extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(2 * TASK_SIZE_64 / 3))
/*
diff -puN arch/arm64/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/arm64/mm/mmap.c
--- a/arch/arm64/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/arm64/mm/mmap.c
@@ -17,6 +17,7 @@
*/
#include <linux/elf.h>
+#include <linux/elf-randomization.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
@@ -47,7 +48,7 @@ static int mmap_is_legacy(void)
return sysctl_legacy_va_layout;
}
-static unsigned long mmap_rnd(void)
+unsigned long mmap_rnd(void)
{
unsigned long rnd = 0;
@@ -89,17 +90,6 @@ void arch_pick_mmap_layout(struct mm_str
}
EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
-unsigned long randomize_et_dyn(unsigned long base)
-{
- unsigned long ret;
- if ((current->personality & ADDR_NO_RANDOMIZE) ||
- !(current->flags & PF_RANDOMIZE))
- return base;
- ret = base + mmap_rnd();
- return (ret > base) ? ret : base;
-}
-
-
/*
* You really shouldn't be using read() or write() on /dev/mem. This might go
* away in the future.
diff -puN arch/mips/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/mips/include/asm/elf.h
--- a/arch/mips/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/mips/include/asm/elf.h
@@ -402,7 +402,6 @@ extern const char *__elf_platform;
that it will "exec", and that there is sufficient room for the brk. */
#ifndef ELF_ET_DYN_BASE
-extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(TASK_SIZE / 3 * 2))
#endif
diff -puN arch/mips/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/mips/mm/mmap.c
--- a/arch/mips/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/mips/mm/mmap.c
@@ -9,6 +9,7 @@
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/mm.h>
+#include <linux/elf-randomization.h>
#include <linux/mman.h>
#include <linux/module.h>
#include <linux/personality.h>
@@ -164,7 +165,7 @@ void arch_pick_mmap_layout(struct mm_str
}
}
-static inline unsigned long mmap_rnd(void)
+unsigned long mmap_rnd(void)
{
unsigned long rnd = get_random_int();
@@ -196,13 +197,3 @@ int __virt_addr_valid(const volatile voi
return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
}
EXPORT_SYMBOL_GPL(__virt_addr_valid);
-
-unsigned long randomize_et_dyn(unsigned long base)
-{
- unsigned long ret;
- if ((current->personality & ADDR_NO_RANDOMIZE) ||
- !(current->flags & PF_RANDOMIZE))
- return base;
- ret = base + brk_rnd();
- return (ret > base) ? ret : base;
-}
diff -puN arch/powerpc/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/powerpc/include/asm/elf.h
--- a/arch/powerpc/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/powerpc/include/asm/elf.h
@@ -27,8 +27,6 @@
use of this is to invoke "./ld.so someprog" to test out a new version of
the loader. We need to make sure that it is out of the way of the program
that it will "exec", and that there is sufficient room for the brk. */
-
-extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(0x20000000))
#define ELF_CORE_EFLAGS (is_elf2_task() ? 2 : 0)
diff -puN arch/powerpc/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/powerpc/mm/mmap.c
--- a/arch/powerpc/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/powerpc/mm/mmap.c
@@ -24,6 +24,7 @@
#include <linux/personality.h>
#include <linux/mm.h>
+#include <linux/elf-randomization.h>
#include <linux/random.h>
#include <linux/sched.h>
@@ -53,7 +54,7 @@ static inline int mmap_is_legacy(void)
return sysctl_legacy_va_layout;
}
-static unsigned long mmap_rnd(void)
+unsigned long mmap_rnd(void)
{
unsigned long rnd = 0;
@@ -97,13 +98,3 @@ void arch_pick_mmap_layout(struct mm_str
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
-
-unsigned long randomize_et_dyn(unsigned long base)
-{
- unsigned long ret;
- if ((current->personality & ADDR_NO_RANDOMIZE) ||
- !(current->flags & PF_RANDOMIZE))
- return base;
- ret = base + mmap_rnd();
- return (ret > base) ? ret : base;
-}
diff -puN arch/x86/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/x86/include/asm/elf.h
--- a/arch/x86/include/asm/elf.h~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/x86/include/asm/elf.h
@@ -248,8 +248,6 @@ extern int force_personality32;
use of this is to invoke "./ld.so someprog" to test out a new version of
the loader. We need to make sure that it is out of the way of the program
that it will "exec", and that there is sufficient room for the brk. */
-
-extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(TASK_SIZE / 3 * 2))
/* This yields a mask that user programs can use to figure out what
diff -puN arch/x86/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix arch/x86/mm/mmap.c
--- a/arch/x86/mm/mmap.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/arch/x86/mm/mmap.c
@@ -29,6 +29,7 @@
#include <linux/random.h>
#include <linux/limits.h>
#include <linux/sched.h>
+#include <linux/elf-randomization.h>
#include <asm/elf.h>
struct va_alignment __read_mostly va_align = {
@@ -65,7 +66,7 @@ static int mmap_is_legacy(void)
return sysctl_legacy_va_layout;
}
-static unsigned long mmap_rnd(void)
+unsigned long mmap_rnd(void)
{
unsigned long rnd = 0;
@@ -122,12 +123,3 @@ void arch_pick_mmap_layout(struct mm_str
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
-unsigned long randomize_et_dyn(unsigned long base)
-{
- unsigned long ret;
- if ((current->personality & ADDR_NO_RANDOMIZE) ||
- !(current->flags & PF_RANDOMIZE))
- return base;
- ret = base + mmap_rnd();
- return (ret > base) ? ret : base;
-}
diff -puN fs/binfmt_elf.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix fs/binfmt_elf.c
--- a/fs/binfmt_elf.c~fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix
+++ a/fs/binfmt_elf.c
@@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/personality.h>
#include <linux/elfcore.h>
+#include <linux/elf-randomization.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/compiler.h>
@@ -2300,6 +2301,26 @@ out:
#endif /* CONFIG_ELF_CORE */
+/* Not all architectures implement mmap_rnd() */
+unsigned long __weak mmap_rnd(void)
+{
+}
+
+/*
+ * Not all architectures use randomize_et_dyn(), so use __weak to let the
+ * linker omit it from vmlinux
+ */
+unsigned long __weak randomize_et_dyn(unsigned long base)
+{
+ unsigned long ret;
+
+ if ((current->personality & ADDR_NO_RANDOMIZE) ||
+ !(current->flags & PF_RANDOMIZE))
+ return base;
+ ret = base + mmap_rnd();
+ return max(ret, base);
+}
+
static int __init init_elf_binfmt(void)
{
register_binfmt(&elf_format);
diff -puN /dev/null include/linux/elf-randomization.h
--- /dev/null
+++ a/include/linux/elf-randomization.h
@@ -0,0 +1,7 @@
+#ifndef __ELF_RANDOMIZATION_H
+#define __ELF_RANDOMIZATION_H
+
+unsigned long randomize_et_dyn(unsigned long base);
+unsigned long mmap_rnd(void);
+
+#endif /* __ELF_RANDOMIZATION_H */
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
arch-alpha-kernel-systblss-remove-debug-check.patch
i-need-old-gcc.patch
kernel-sysc-fix-uname26-for-40-fix.patch
mm.patch
mm-cma-release-trigger-checkpatch-fixes.patch
mm-cma-allocation-trigger-fix.patch
mm-compaction-enhance-compaction-finish-condition-fix.patch
page_writeback-cleanup-mess-around-cancel_dirty_page-checkpatch-fixes.patch
mm-hide-per-cpu-lists-in-output-of-show_mem-fix.patch
mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
x86-add-pmd_-for-thp-fix.patch
sparc-add-pmd_-for-thp-fix.patch
mips-rename-brk_rnd-to-mmap_rnd.patch
fix-offset2lib-issue-for-x86-arm-powerpc-and-mips-fix.patch
kernel-conditionally-support-non-root-users-groups-and-capabilities-checkpatch-fixes.patch
lib-find__bit-reimplementation-fix.patch
fs-fat-remove-unnecessary-includes-fix.patch
kconfig-use-macros-which-are-already-defined-fix.patch
linux-next.patch
linux-next-rejects.patch
lib-kconfig-fix-up-have_arch_bitreverse-help-text.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
journal_add_journal_head-debug.patch
journal_add_journal_head-debug-fix.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module.patch
slab-leaks3-default-y.patch
--
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