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| author |   David Daney <ddaney.cavm@gmail.com> | 2012-01-10 15:10:21 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-10 16:30:51 -0800 |
| commit | e39f560239984c3098237ad94c9449b1494163f8 (patch) | |
| tree | c86d9f84a3cb706813919ec7472fb75207bc9c8c | |
| parent | crc32: optimize inner loop (diff) | |
| download | linux-dev-e39f560239984c3098237ad94c9449b1494163f8.tar.xz linux-dev-e39f560239984c3098237ad94c9449b1494163f8.zip | |
fs: binfmt_elf: create Kconfig variable for PIE randomization
Randomization of PIE load address is hard coded in binfmt_elf.c for X86
and ARM. Create a new Kconfig variable
(CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE) for this and use it instead. Thus
architecture specific policy is pushed out of the generic binfmt_elf.c and
into the architecture Kconfig files.
X86 and ARM Kconfigs are modified to select the new variable so there is
no change in behavior. A follow on patch will select it for MIPS too.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | fs/Kconfig.binfmt | 3 | ||||
| -rw-r--r-- | fs/binfmt_elf.c | 2 |
4 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9d66dfc33a5a..98a6459cd398 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -16,6 +16,7 @@ config ARM select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) + select ARCH_BINFMT_ELF_RANDOMIZE_PIE select HAVE_GENERIC_DMA_COHERENT select HAVE_KERNEL_GZIP select HAVE_KERNEL_LZO diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1d2a69dd36d8..d6ddc0bfe36a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -62,6 +62,7 @@ config X86 select ANON_INODES select HAVE_ARCH_KMEMCHECK select HAVE_USER_RETURN_NOTIFIER + select ARCH_BINFMT_ELF_RANDOMIZE_PIE select HAVE_ARCH_JUMP_LABEL select HAVE_TEXT_POKE_SMP select HAVE_GENERIC_HARDIRQS diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt index 79e2ca7973b7..e95d1b64082c 100644 --- a/fs/Kconfig.binfmt +++ b/fs/Kconfig.binfmt @@ -27,6 +27,9 @@ config COMPAT_BINFMT_ELF bool depends on COMPAT && BINFMT_ELF +config ARCH_BINFMT_ELF_RANDOMIZE_PIE + bool + config BINFMT_ELF_FDPIC bool "Kernel support for FDPIC ELF binaries" default y diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 21ac5ee4b43f..bcb884e2d613 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -794,7 +794,7 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) * default mmap base, as well as whatever program they * might try to exec. This is because the brk will * follow the loader, and is not movable. */ -#if defined(CONFIG_X86) || defined(CONFIG_ARM) +#ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE /* Memory randomization might have been switched off * in runtime via sysctl. * If that is the case, retain the original non-zero |