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| author | Nathan Chancellor <nathan@kernel.org> | 2022-03-18 16:07:47 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-22 21:12:13 +0100 |
| commit | f6a2c2b2de817078ac5a7e58c10e746165e7825d (patch) | |
| tree | 27c0524e4ca8afcbe412c0478c916f897a63cb0d /arch/x86 | |
| parent | 262448f3d18959d175b10e28a3b65f41d1d7313f (diff) | |
| download | linux-f6a2c2b2de817078ac5a7e58c10e746165e7825d.tar.bz2 | |
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
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 921e4ebda564..87579264aa00 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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 |