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.
Link: https://github.com/ClangBuiltLinux/linux/issues/1756
Signed-off-by: Nathan Chancellor <[email protected]>
---
It would be nice if this could be picked up for an -rc release but I
won't argue otherwise.
Alternatively, we could add '--undefined-version' to the vDSO ldflags
but this does not seem unreasonable to me.
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 4bf48462fca7..e8c60ae7a7c8 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: *;
};
}
base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
--
2.38.1
On Tue, Nov 8, 2022 at 4:04 PM Nathan Chancellor <[email protected]> wrote:
>
> 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.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1756
> Signed-off-by: Nathan Chancellor <[email protected]>
> ---
>
> It would be nice if this could be picked up for an -rc release but I
> won't argue otherwise.
Sounds like the lld change got reverted, so this is less urgent now,
but the change still LGTM regardless. Thanks for the patch!
Reviewed-by: Nick Desaulniers <[email protected]>
Fixes: 8466436952017 ("x86/vdso: Implement a vDSO for Intel SGX enclave call")
>
> Alternatively, we could add '--undefined-version' to the vDSO ldflags
> but this does not seem unreasonable to me.
>
> 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 4bf48462fca7..e8c60ae7a7c8 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: *;
> };
> }
>
> base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
> --
> 2.38.1
>
>
--
Thanks,
~Nick Desaulniers
Ping? The default switch was remerged a couple of days ago so builds
with tip of tree LLVM are going to be broken again:
https://github.com/llvm/llvm-project/commit/241dbd310599e3c1a0f1b0c9ced14c8b8760539e
Cheers,
Nathan
On Tue, Nov 08, 2022 at 05:03:07PM -0700, Nathan Chancellor wrote:
> 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.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1756
> Signed-off-by: Nathan Chancellor <[email protected]>
> ---
>
> It would be nice if this could be picked up for an -rc release but I
> won't argue otherwise.
>
> Alternatively, we could add '--undefined-version' to the vDSO ldflags
> but this does not seem unreasonable to me.
>
> 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 4bf48462fca7..e8c60ae7a7c8 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: *;
> };
> }
>
> base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
> --
> 2.38.1
>
>
On Fri, Dec 09 2022 at 06:46, Nathan Chancellor wrote:
> Ping? The default switch was remerged a couple of days ago so builds
> with tip of tree LLVM are going to be broken again:
>
> https://github.com/llvm/llvm-project/commit/241dbd310599e3c1a0f1b0c9ced14c8b8760539e
Sorry. That fell through the cracks. I'll take care of it.
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 45be2ad007a9c6bea70249c4cf3e4905afe4caeb
Gitweb: https://git.kernel.org/tip/45be2ad007a9c6bea70249c4cf3e4905afe4caeb
Author: Nathan Chancellor <[email protected]>
AuthorDate: Tue, 08 Nov 2022 17:03:07 -07:00
Committer: Thomas Gleixner <[email protected]>
CommitterDate: Fri, 09 Dec 2022 14:58:02 +01:00
x86/vdso: Conditionally export __vdso_sgx_enter_enclave()
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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Link: https://github.com/ClangBuiltLinux/linux/issues/1756
Link: https://lore.kernel.org/r/[email protected]
---
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: *;
};
}
On Fri, Dec 09, 2022 at 02:54:52PM +0100, Thomas Gleixner wrote:
> On Fri, Dec 09 2022 at 06:46, Nathan Chancellor wrote:
> > Ping? The default switch was remerged a couple of days ago so builds
> > with tip of tree LLVM are going to be broken again:
> >
> > https://github.com/llvm/llvm-project/commit/241dbd310599e3c1a0f1b0c9ced14c8b8760539e
>
> Sorry. That fell through the cracks. I'll take care of it.
Thanks Thomas! I get you all are always busy so I appreciate the quick
response.
Cheers,
Nathan