linux-kernel - Re: [PATCH -next] crypto: curve25519 - Fix build error when CRYPTO_MANAGER_DISABLE

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Date:   Sat, 28 May 2022 08:19:09 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Zheng Bin <zhengbin13@...wei.com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        gaochao49@...wei.com
Subject: Re: [PATCH -next] crypto: curve25519 - Fix build error when
 CRYPTO_MANAGER_DISABLE_TESTS!=y && CRYPTO=m

On 5/28/22, Zheng Bin <zhengbin13@...wei.com> wrote:
> If CRYPTO_MANAGER_DISABLE_TESTS!=y, CRYPTO=m, bulding fails:
>
> lib/crypto/curve25519-selftest.o: In function `curve25519_selftest':
> curve25519-selftest.c:(.init.text+0x60): undefined reference to
> `__crypto_memneq'
> curve25519-selftest.c:(.init.text+0xec): undefined reference to
> `__crypto_memneq'
> curve25519-selftest.c:(.init.text+0x114): undefined reference to
> `__crypto_memneq'
> curve25519-selftest.c:(.init.text+0x154): undefined reference to
> `__crypto_memneq'
>
> Add depends for CRYPTO_LIB_CURVE25519 to fix this.

In this case, the bug isn't caused by the tests exactly but by the
curve25519.h inline usage here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/crypto/curve25519.h#n43

Probably the solution for this one is to move crypto_memneq into lib/crypto.

Jason