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

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Date:   Fri, 26 Aug 2022 01:00:58 +0800
From:   Zixuan Tan <tanzixuan.me@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
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>,
        Zixuan Tan <tanzixuan.me@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf/genelf: Switch deprecated openssl MD5_* functions to new
 EVP API

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")
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