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| author | Arjan van de Ven <arjan@linux.intel.com> | 2006-09-26 10:52:38 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:38 +0200 |
| commit | b62a5c740df1e3d49a97349fce0c6a23f633d7fe (patch) | |
| tree | d29b6a60f5d8d4d0d93c4eeece5526e8f9281f1c | |
| parent | [PATCH] Add comments to the PDA structure to annotate offsets (diff) | |
| download | linux-b62a5c740df1e3d49a97349fce0c6a23f633d7fe.tar.xz linux-b62a5c740df1e3d49a97349fce0c6a23f633d7fe.zip | |
[PATCH] Add the Kconfig option for the stackprotector feature
This patch adds the config options for -fstack-protector.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andi Kleen <ak@suse.de>
CC: Andi Kleen <ak@suse.de>
| -rw-r--r-- | arch/x86_64/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 927b392a4aa0..0c61d0019dd7 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -533,6 +533,30 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. +config CC_STACKPROTECTOR + bool "Enable -fstack-protector buffer overflow detection (EXPRIMENTAL)" + depends on EXPERIMENTAL + help + This option turns on the -fstack-protector GCC feature. This + feature puts, at the beginning of critical functions, a canary + value on the stack just before the return address, and validates + the value just before actually returning. Stack based buffer + overflows (that need to overwrite this return address) now also + overwrite the canary, which gets detected and the attack is then + neutralized via a kernel panic. + + This feature requires gcc version 4.2 or above, or a distribution + gcc with the feature backported. Older versions are automatically + detected and for those versions, this configuration option is ignored. + +config CC_STACKPROTECTOR_ALL + bool "Use stack-protector for all functions" + depends on CC_STACKPROTECTOR + help + Normally, GCC only inserts the canary value protection for + functions that use large-ish on-stack buffers. By enabling + this option, GCC will be asked to do this for ALL functions. + source kernel/Kconfig.hz config REORDER |