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fs: binfmt_elf: create Kconfig variable for PIE randomization

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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 <[email protected]>
Cc: Russell King <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Alexander Viro <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Cc: Ralf Baechle <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Daney 2012-01-10 15:10:21 -08:00 • committed by Linus Torvalds
commit e39f560239
4 changed files with 6 additions and 1 deletions
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3
fs/Kconfig.binfmt
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@ -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