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Date: Wed, 9 Nov 2011 16:32:57 -0800 From: David Daney <david.daney@...ium.com> To: linux-mips@...ux-mips.org, ralf@...ux-mips.org, linux-kernel@...r.kernel.org Cc: David Daney <david.daney@...ium.com>, Russell King <linux@....linux.org.uk>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, Alexander Viro <viro@...iv.linux.org.uk>, linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org Subject: [PATCH 1/2] 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. Cc: Russell King <linux@....linux.org.uk> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: "H. Peter Anvin" <hpa@...or.com> Cc: x86@...nel.org Cc: Alexander Viro <viro@...iv.linux.org.uk> Cc: linux-arm-kernel@...ts.infradead.org Cc: linux-kernel@...r.kernel.org Cc: linux-fsdevel@...r.kernel.org Signed-off-by: David Daney <david.daney@...ium.com> --- arch/arm/Kconfig | 1 + arch/x86/Kconfig | 1 + fs/Kconfig.binfmt | 3 +++ fs/binfmt_elf.c | 2 +- 4 files changed, 6 insertions(+), 1 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 44789ef..3830439 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -30,6 +30,7 @@ config ARM select HAVE_SPARSE_IRQ select GENERIC_IRQ_SHOW select CPU_PM if (SUSPEND || CPU_IDLE) + select ARCH_BINFMT_ELF_RANDOMIZE_PIE help The ARM series is a line of low-power-consumption RISC chip designs licensed by ARM Ltd and targeted at embedded applications and diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index cb9a104..9c3e447 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -75,6 +75,7 @@ config X86 select HAVE_BPF_JIT if (X86_64 && NET) select CLKEVT_I8253 select ARCH_HAVE_NMI_SAFE_CMPXCHG + select ARCH_BINFMT_ELF_RANDOMIZE_PIE config INSTRUCTION_DECODER def_bool (KPROBES || PERF_EVENTS) diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt index 79e2ca7..e95d1b6 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 21ac5ee..bcb884e 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 -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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