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[redhat] New configs in arch/arm64

CKI Gitlab requested to merge configs/2021-06-29/arch/arm64 into os-build

Hi,

As part of the ongoing rebase effort, the following configuration options need to be reviewed.

As a reminder, the ARK configuration flow involves moving unreviewed configuration options from the pending directory to the ark directory. In the diff below, options are removed from the pending directory and added to the ark hierarchy. The final options that need to be ACKed are the files that are being added to the ark hierarchy.

If the value for a file that is added should be changed, please reply with a better option.

CONFIG_ARM64_PTR_AUTH_KERNEL:

If the compiler supports the -mbranch-protection or -msign-return-address flag (e.g. GCC 7 or later), then this option will cause the kernel itself to be compiled with return address protection. In this case, and if the target hardware is known to support pointer authentication, then CONFIG_STACKPROTECTOR can be disabled with minimal loss of protection.

This feature works with FUNCTION_GRAPH_TRACER option only if DYNAMIC_FTRACE_WITH_REGS is enabled.

Symbol: ARM64_PTR_AUTH_KERNEL [=y] Type : bool Defined at arch/arm64/Kconfig:1506 Prompt: Use pointer authentication for kernel Depends on: ARM64_PTR_AUTH [=y] && (CC_HAS_SIGN_RETURN_ADDRESS [=y] || CC_HAS_BRANCH_PROT_PAC_RET [=y]) && AS_HAS_PAC [=y] && (LD_IS_LLD [=n] || LD_VERSION [=25000]>=23301 || CC_IS_GCC [=y] && GCC_VERSION [=200000]<90100) && (!CC_IS_CLANG [=n] || AS_HAS_CFI_NEGATE_RA_STATE [=y]) && (!FUNCTION_GRAPH_TRACER [=y] || DYNAMIC_FTRACE_WITH_REGS [=y]) Location: -> Kernel Features -> ARMv8.3 architectural features -> Enable support for pointer authentication (ARM64_PTR_AUTH [=y])

Cc: Mark Salter msalter@redhat.com Cc: Mark Langsdorf mlangsdo@redhat.com Cc: Jeremy Linton jlinton@redhat.com Signed-off-by: Fedora Kernel Team kernel-team@fedoraproject.org

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