linux-kernel - Re: [PATCH 4/4] build: Switch to new openssl API for test-libcrypto

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Date:   Mon, 8 Aug 2022 15:33:34 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Roberto Sassu <roberto.sassu@...wei.com>, quentin@...valent.com,
        ast@...nel.org, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, john.fastabend@...il.com, kpsingh@...nel.org,
        sdf@...gle.com, peterz@...radead.org, mingo@...hat.com,
        terrelln@...com, nathan@...nel.org, ndesaulniers@...gle.com,
        bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] build: Switch to new openssl API for test-libcrypto

Em Mon, Aug 08, 2022 at 06:14:48PM +0200, Daniel Borkmann escreveu:
> Hi Arnaldo,
> 
> On 7/19/22 7:05 PM, Roberto Sassu wrote:
> > Switch to new EVP API for detecting libcrypto, as Fedora 36 returns an
> > error when it encounters the deprecated function MD5_Init() and the others.
> > The error would be interpreted as missing libcrypto, while in reality it is
> > not.
> > 
> > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> 
> Given rest of the tooling fixes from Andres Freund went via perf tree and the
> below is perf related as well, I presume you'll pick this up, too?

Sure.
 
>   [0] https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=perf/core
> 
> >   tools/build/feature/test-libcrypto.c | 15 +++++++++++----
> >   1 file changed, 11 insertions(+), 4 deletions(-)
> > 
> > diff --git a/tools/build/feature/test-libcrypto.c b/tools/build/feature/test-libcrypto.c
> > index a98174e0569c..bc34a5bbb504 100644
> > --- a/tools/build/feature/test-libcrypto.c
> > +++ b/tools/build/feature/test-libcrypto.c
> > @@ -1,16 +1,23 @@
> >   // SPDX-License-Identifier: GPL-2.0
> > +#include <openssl/evp.h>
> >   #include <openssl/sha.h>
> >   #include <openssl/md5.h>
> >   int main(void)
> >   {
> > -	MD5_CTX context;
> > +	EVP_MD_CTX *mdctx;
> >   	unsigned char md[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
> >   	unsigned char dat[] = "12345";
> > +	unsigned int digest_len;
> > -	MD5_Init(&context);
> > -	MD5_Update(&context, &dat[0], sizeof(dat));
> > -	MD5_Final(&md[0], &context);
> > +	mdctx = EVP_MD_CTX_new();
> > +	if (!mdctx)
> > +		return 0;
> > +
> > +	EVP_DigestInit_ex(mdctx, EVP_md5(), NULL);
> > +	EVP_DigestUpdate(mdctx, &dat[0], sizeof(dat));
> > +	EVP_DigestFinal_ex(mdctx, &md[0], &digest_len);
> > +	EVP_MD_CTX_free(mdctx);
> >   	SHA1(&dat[0], sizeof(dat), &md[0]);
> > 

-- 

- Arnaldo