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perf tools: Do not fail in case of empty HOME env variable

PATCH Applied Jiri Olsa 3 participants 3 messages Mar 30, 2017 – Apr 2, 2017 perf events

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Jiri Olsa

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#0 lore raw

PATCH 1/1 perf tools: Do not fail in case of empty HOME env variable

From: Jiri Olsa <[email protected]>

Currently we fail in following case:

  $ unset HOME
  $ ./perf record ls
  $ echo $?
  255

It's because of the config code init fails due to missing HOME variable value. Fixing this by skipping the user config init if there's no HOME variable value.

Reported-by Jan Stancek <[email protected]>
Link http://lkml.kernel.org/n/[email protected] open here
Signed-off-by Jiri Olsa <[email protected]>
---
 tools/perf/util/config.c | 54 +++++++++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 23 deletions(-)
tools/perf/util/config.c +31 -23
index 0c7d5a4975cd..7b01d59076d3 100644
@@ -627,6 +627,8 @@ static int perf_config_set__init(struct perf_config_set *set)
 {
 	int ret = -1;
 	const char *home = NULL;
+	char *user_config;
+	struct stat st;
 
 	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
 	if (config_exclusive_filename)

@@ -637,35 +639,41 @@ static int perf_config_set__init(struct perf_config_set *set)
 	}
 
 	home = getenv("HOME");
-	if (perf_config_global() && home) {
-		char *user_config = strdup(mkpath("%s/.perfconfig", home));
-		struct stat st;
 
-		if (user_config == NULL) {
-			warning("Not enough memory to process %s/.perfconfig, "
-				"ignoring it.", home);
-			goto out;
-		}
+	/*
+	 * Skip reading user config if:
+	 *   - there is no place to read it from (HOME)
+	 *   - we are asked not to (PERF_CONFIG_NOGLOBAL=1)
+	 */
+	if (!home || !*home || !perf_config_global())
+		return 0;
 
-		if (stat(user_config, &st) < 0) {
-			if (errno == ENOENT)
-				ret = 0;
-			goto out_free;
-		}
+	user_config = strdup(mkpath("%s/.perfconfig", home));
+	if (user_config == NULL) {
+		warning("Not enough memory to process %s/.perfconfig, "
+			"ignoring it.", home);
+		goto out;
+	}
+
+	if (stat(user_config, &st) < 0) {
+		if (errno == ENOENT)
+			ret = 0;
+		goto out_free;
+	}
 
-		ret = 0;
+	ret = 0;
 
-		if (st.st_uid && (st.st_uid != geteuid())) {
-			warning("File %s not owned by current user or root, "
-				"ignoring it.", user_config);
-			goto out_free;
-		}
+	if (st.st_uid && (st.st_uid != geteuid())) {
+		warning("File %s not owned by current user or root, "
+			"ignoring it.", user_config);
+		goto out_free;
+	}
+
+	if (st.st_size)
+		ret = perf_config_from_file(collect_config, user_config, set);
 
-		if (st.st_size)
-			ret = perf_config_from_file(collect_config, user_config, set);
 out_free:
-		free(user_config);
-	}
+	free(user_config);
 out:
 	return ret;
 }
Signature · 1 line
2.9.3
maintainer Applied
#1 lore raw

Em Thu, Mar 30, 2017 at 04:46:37PM +0200, Jiri Olsa escreveu:

Quoted 7 lines

From: Jiri Olsa <[email protected]>

Currently we fail in following case:

  $ unset HOME
  $ ./perf record ls
  $ echo $?
  255

Thanks, applied.

- Arnaldo

merge bot
#2 lore raw
In reply to Jiri Olsa
perf tools: Do not fail in case of empty HOME env variable
Commit-ID:  3e00cbe8891a655520ca2cfe9b6d509d0a845f07
Gitweb:     http://git.kernel.org/tip/3e00cbe8891a655520ca2cfe9b6d509d0a845f07
Author:     Jiri Olsa <[email protected]>
AuthorDate: Thu, 30 Mar 2017 16:46:37 +0200
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Fri, 31 Mar 2017 11:26:04 -0300

perf tools: Do not fail in case of empty HOME env variable

Currently we fail in the following case:

  $ unset HOME
  $ ./perf record ls
  $ echo $?
  255

It's because the config code init fails due to a missing HOME variable value. Fix this by skipping the user config init if there's no HOME variable value.

Reported-by Jan Stancek <[email protected]>
Signed-off-by Jiri Olsa <[email protected]>
Cc David Ahern <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Peter Zijlstra <[email protected]>
Link http://lkml.kernel.org/r/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/util/config.c | 54 +++++++++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 23 deletions(-)
tools/perf/util/config.c +31 -23
index 0c7d5a4..7b01d59 100644
@@ -627,6 +627,8 @@ static int perf_config_set__init(struct perf_config_set *set)
 {
 	int ret = -1;
 	const char *home = NULL;
+	char *user_config;
+	struct stat st;
 
 	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
 	if (config_exclusive_filename)

@@ -637,35 +639,41 @@ static int perf_config_set__init(struct perf_config_set *set)
 	}
 
 	home = getenv("HOME");
-	if (perf_config_global() && home) {
-		char *user_config = strdup(mkpath("%s/.perfconfig", home));
-		struct stat st;
 
-		if (user_config == NULL) {
-			warning("Not enough memory to process %s/.perfconfig, "
-				"ignoring it.", home);
-			goto out;
-		}
+	/*
+	 * Skip reading user config if:
+	 *   - there is no place to read it from (HOME)
+	 *   - we are asked not to (PERF_CONFIG_NOGLOBAL=1)
+	 */
+	if (!home || !*home || !perf_config_global())
+		return 0;
 
-		if (stat(user_config, &st) < 0) {
-			if (errno == ENOENT)
-				ret = 0;
-			goto out_free;
-		}
+	user_config = strdup(mkpath("%s/.perfconfig", home));
+	if (user_config == NULL) {
+		warning("Not enough memory to process %s/.perfconfig, "
+			"ignoring it.", home);
+		goto out;
+	}
+
+	if (stat(user_config, &st) < 0) {
+		if (errno == ENOENT)
+			ret = 0;
+		goto out_free;
+	}
 
-		ret = 0;
+	ret = 0;
 
-		if (st.st_uid && (st.st_uid != geteuid())) {
-			warning("File %s not owned by current user or root, "
-				"ignoring it.", user_config);
-			goto out_free;
-		}
+	if (st.st_uid && (st.st_uid != geteuid())) {
+		warning("File %s not owned by current user or root, "
+			"ignoring it.", user_config);
+		goto out_free;
+	}
+
+	if (st.st_size)
+		ret = perf_config_from_file(collect_config, user_config, set);
 
-		if (st.st_size)
-			ret = perf_config_from_file(collect_config, user_config, set);
 out_free:
-		free(user_config);
-	}
+	free(user_config);
 out:
 	return ret;
 }