linux-kernel - [PATCH v8 2/3] perf tests: avoid storing an absolute path in perf binary

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Date:   Mon, 24 May 2021 04:15:13 -0700
From:   Denys Zagorui <dzagorui@...co.com>
To:     jolsa@...hat.com, linux-kernel@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org
Subject: [PATCH v8 2/3] perf tests: avoid storing an absolute path in perf binary

python binding test uses PYTHONPATH definition to find python/perf.so
library. This definition is an absolute path that makes perf binary
unreproducible. This path can be found during runtime execution.

Signed-off-by: Denys Zagorui <dzagorui@...co.com>
---
 tools/perf/tests/Build        |  2 +-
 tools/perf/tests/python-use.c | 25 ++++++++++++++++++++++---
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 650aec19d490..a20098dcdbc4 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -98,5 +98,5 @@ perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
 endif
 
 CFLAGS_attr.o         += -DBINDIR="BUILD_STR($(bindir_SQ))" -DPYTHON="BUILD_STR($(PYTHON_WORD))"
-CFLAGS_python-use.o   += -DPYTHONPATH="BUILD_STR($(OUTPUT)python)" -DPYTHON="BUILD_STR($(PYTHON_WORD))"
+CFLAGS_python-use.o   += -DPYTHON="BUILD_STR($(PYTHON_WORD))"
 CFLAGS_dwarf-unwind.o += -fno-optimize-sibling-calls
diff --git a/tools/perf/tests/python-use.c b/tools/perf/tests/python-use.c
index 98c6d474aa6f..32af71300aa3 100644
--- a/tools/perf/tests/python-use.c
+++ b/tools/perf/tests/python-use.c
@@ -8,18 +8,37 @@
 #include <linux/compiler.h>
 #include "tests.h"
 #include "util/debug.h"
+#include "util/util.h"
+#include <sys/stat.h>
+#include <limits.h>
+#include <libgen.h>
 
 int test__python_use(struct test *test __maybe_unused, int subtest __maybe_unused)
 {
 	char *cmd;
-	int ret;
+	int ret = -1;
+	char *exec_path;
+	char buf[PATH_MAX];
+	char *pythonpath;
+	struct stat sb;
+
+	perf_exe(buf, PATH_MAX);
+	exec_path = dirname(buf);
+
+	if (asprintf(&pythonpath, "%s/python", exec_path) < 0)
+		return ret;
+
+	if (stat(pythonpath, &sb) || !S_ISDIR(sb.st_mode))
+		pythonpath[0] = 0;
 
 	if (asprintf(&cmd, "echo \"import sys ; sys.path.append('%s'); import perf\" | %s %s",
-		     PYTHONPATH, PYTHON, verbose > 0 ? "" : "2> /dev/null") < 0)
-		return -1;
+		     pythonpath, PYTHON, verbose > 0 ? "" : "2> /dev/null") < 0)
+		goto out;
 
 	pr_debug("python usage test: \"%s\"\n", cmd);
 	ret = system(cmd) ? -1 : 0;
 	free(cmd);
+out:
+	free(pythonpath);
 	return ret;
 }
-- 
2.26.2.Cisco