From: Nathan Chancellor nathan@kernel.org
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 nathan@kernel.org Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Nick Desaulniers ndesaulniers@google.com 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 gregkh@linuxfoundation.org --- arch/x86/entry/vdso/vdso.lds.S | 2 ++ 1 file changed, 2 insertions(+)
--- 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: *; }; }