linux-kernel - Re: [PATCH] perf/genelf: Switch deprecated openssl MD5

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Date:   Thu, 25 Aug 2022 17:17:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Zixuan Tan <tanzixuan.me@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf/genelf: Switch deprecated openssl MD5_* functions
 to new EVP API

Em Fri, Aug 26, 2022 at 01:00:58AM +0800, Zixuan Tan escreveu:
> Switch to the flavored EVP API like in test-libcrypto.c, and remove the
> bad gcc #pragma.
> 
> Inspired-By: 5b245985a6de ("tools build: Switch to new openssl API for
> test-libcrypto")

How did you test the end result? Can you please describe step by step?

Also please consider adding a 'perf test' entry to make sure this
doesn't regress.

Thanks,

- Arnaldo

> Signed-off-by: Zixuan Tan <tanzixuan.me@...il.com>
> ---
>  tools/perf/util/genelf.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/perf/util/genelf.c b/tools/perf/util/genelf.c
> index 953338b9e887..ed28a0dbcb7f 100644
> --- a/tools/perf/util/genelf.c
> +++ b/tools/perf/util/genelf.c
> @@ -30,10 +30,6 @@
> 
>  #define BUILD_ID_URANDOM /* different uuid for each run */
> 
> -// FIXME, remove this and fix the deprecation warnings before its removed and
> -// We'll break for good here...
> -#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
> -
>  #ifdef HAVE_LIBCRYPTO_SUPPORT
> 
>  #define BUILD_ID_MD5
> @@ -45,6 +41,7 @@
>  #endif
> 
>  #ifdef BUILD_ID_MD5
> +#include <openssl/evp.h>
>  #include <openssl/md5.h>
>  #endif
>  #endif
> @@ -142,15 +139,20 @@ gen_build_id(struct buildid_note *note,
>  static void
>  gen_build_id(struct buildid_note *note, unsigned long load_addr,
> const void *code, size_t csize)
>  {
> -       MD5_CTX context;
> +       EVP_MD_CTX *mdctx;
> 
>         if (sizeof(note->build_id) < 16)
>                 errx(1, "build_id too small for MD5");
> 
> -       MD5_Init(&context);
> -       MD5_Update(&context, &load_addr, sizeof(load_addr));
> -       MD5_Update(&context, code, csize);
> -       MD5_Final((unsigned char *)note->build_id, &context);
> +       mdctx = EVP_MD_CTX_new();
> +       if (!mdctx)
> +               errx(2, "failed to create EVP_MD_CTX");
> +
> +       EVP_DigestInit_ex(mdctx, EVP_md5(), NULL);
> +       EVP_DigestUpdate(mdctx, &load_addr, sizeof(load_addr));
> +       EVP_DigestUpdate(mdctx, code, csize);
> +       EVP_DigestFinal_ex(mdctx, (unsigned char *)note->build_id, NULL);
> +       EVP_MD_CTX_free(mdctx);
>  }
>  #endif
> 
> -- 
> 2.34.1

-- 

- Arnaldo