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x86/Kconfig: Only allow CONFIG_X86_KERNEL_IBT with ld.lld >= 14.0.0 

With CONFIG_X86_KERNEL_IBT=y and a version of ld.lld prior to 14.0.0,
there are numerous objtool warnings along the lines of:

  warning: objtool: .plt+0x6: indirect jump found in RETPOLINE build

This is a known issue that has been resolved in ld.lld 14.0.0. Prevent
CONFIG_X86_KERNEL_IBT from being selectable when using one of these
problematic ld.lld versions.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220318230747.3900772-3-nathan@kernel.org
This commit is contained in:
Nathan Chancellor 2022-03-18 16:07:47 -07:00 committed by Peter Zijlstra
parent 262448f3d1
commit f6a2c2b2de
1 changed files with 2 additions and 0 deletions
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arch/x86/Kconfig
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@ -1875,6 +1875,8 @@ config X86_KERNEL_IBT
prompt "Indirect Branch Tracking"
bool
depends on X86_64 && CC_HAS_IBT && STACK_VALIDATION
# https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f
depends on !LD_IS_LLD || LLD_VERSION >= 140000
help
Build the kernel with support for Indirect Branch Tracking, a
hardware support course-grain forward-edge Control Flow Integrity