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x86/vdso: Conditionally export __vdso_sgx_enter_enclave() 

commit 45be2ad007 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: 8466436952 ("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>
This commit is contained in:
Nathan Chancellor 2022-11-08 17:03:07 -07:00 committed by Greg Kroah-Hartman
parent 830b3c68c1
commit 96c5043a4d
1 changed files with 2 additions and 0 deletions
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2
arch/x86/entry/vdso/vdso.lds.S
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@ -27,7 +27,9 @@ VERSION {
__vdso_time;
clock_getres;
__vdso_clock_getres;
#ifdef CONFIG_X86_SGX
__vdso_sgx_enter_enclave;
#endif
local: *;
};
}