From 86e28ed25b0005f318a9db09659bc8e4e208b2c3 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Tue, 8 Nov 2022 17:03:07 -0700 Subject: [PATCH] x86/vdso: Conditionally export __vdso_sgx_enter_enclave() commit 45be2ad007a9c6bea70249c4cf3e4905afe4caeb upstream. Recently, ld.lld moved from '--undefined-version' to '--no-undefined-version' as the default, which breaks building the vDSO when CONFIG_X86_SGX is not set: ld.lld: error: version script assignment of 'LINUX_2.6' to symbol '__vdso_sgx_enter_enclave' failed: symbol not defined __vdso_sgx_enter_enclave is only included in the vDSO when CONFIG_X86_SGX is set. Only export it if it will be present in the final object, which clears up the error. Fixes: 8466436952017 ("x86/vdso: Implement a vDSO for Intel SGX enclave call") Signed-off-by: Nathan Chancellor Signed-off-by: Thomas Gleixner Reviewed-by: Nick Desaulniers Link: https://github.com/ClangBuiltLinux/linux/issues/1756 Link: https://lore.kernel.org/r/20221109000306.1407357-1-nathan@kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/x86/entry/vdso/vdso.lds.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/entry/vdso/vdso.lds.S b/arch/x86/entry/vdso/vdso.lds.S index 4bf4846..e8c60ae 100644 --- a/arch/x86/entry/vdso/vdso.lds.S +++ b/arch/x86/entry/vdso/vdso.lds.S @@ -27,7 +27,9 @@ VERSION { __vdso_time; clock_getres; __vdso_clock_getres; +#ifdef CONFIG_X86_SGX __vdso_sgx_enter_enclave; +#endif local: *; }; } -- 2.7.4