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| author | Gregory Fong | 2013-06-12 19:08:54 +0200 |
|---|---|---|
| committer | Ralf Baechle | 2013-07-01 15:10:48 +0200 |
| commit | 36ecafc5ad17861e2bc1fb12af4cc97680e25942 (patch) | |
| tree | 8b1094782049660b366b417119d34a5a519e0c95 /arch/mips/Kconfig | |
| parent | MIPS: Boot: Compressed: Remove -fstack-protector from CFLAGS (diff) | |
| download | kernel-qcow2-linux-36ecafc5ad17861e2bc1fb12af4cc97680e25942.tar.gz kernel-qcow2-linux-36ecafc5ad17861e2bc1fb12af4cc97680e25942.tar.xz kernel-qcow2-linux-36ecafc5ad17861e2bc1fb12af4cc97680e25942.zip | |
MIPS: initial stack protector support
Implements basic stack protector support based on ARM version in
c743f38013aeff58ef6252601e397b5ba281c633 , with Kconfig option,
constant canary value set at boot time, and script to check if
compiler actually supports stack protector.
Tested by creating a kernel module that writes past end of char[].
Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Cc: Carmelo Amoroso <carmelo.amoroso@st.com>
Patchwork: https://patchwork.linux-mips.org/patch/5448/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 69bf31062ca4..6dbeb273afc6 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2367,6 +2367,19 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. +config CC_STACKPROTECTOR + bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" + help + This option turns on the -fstack-protector GCC feature. This + feature puts, at the beginning of 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. + config USE_OF bool select OF |