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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-12-12 13:08:44 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-12 18:45:31 +0000 |
| commit | 0a1213fa7432778b71a1c0166bf56660a3aab030 (patch) | |
| tree | ddf7b68d14a504fe97fbdefe00bf8a3296590cc5 /arch/arm64/Kconfig | |
| parent | 4ab215061554ae2a4b78744a5dd3b3c6639f16a7 (diff) | |
| download | lwn-0a1213fa7432778b71a1c0166bf56660a3aab030.tar.gz lwn-0a1213fa7432778b71a1c0166bf56660a3aab030.zip | |
arm64: enable per-task stack canaries
This enables the use of per-task stack canary values if GCC has
support for emitting the stack canary reference relative to the
value of sp_el0, which holds the task struct pointer in the arm64
kernel.
The $(eval) extends KBUILD_CFLAGS at the moment the make rule is
applied, which means asm-offsets.o (which we rely on for the offset
value) is built without the arguments, and everything built afterwards
has the options set.
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e9af113c572f..0b3aa2a894a7 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1344,6 +1344,13 @@ config RANDOMIZE_MODULE_REGION_FULL a limited range that contains the [_stext, _etext] interval of the core kernel, so branch relocations are always in range. +config CC_HAVE_STACKPROTECTOR_SYSREG + def_bool $(cc-option,-mstack-protector-guard=sysreg -mstack-protector-guard-reg=sp_el0 -mstack-protector-guard-offset=0) + +config STACKPROTECTOR_PER_TASK + def_bool y + depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG + endmenu menu "Boot options" |