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perf tools: Fix snprint warnings for gcc 8

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commit 77f18153c080855e1c3fb520ca31a4e61530121d upstream.

[Add an additional sprintf replacement in tools/perf/builtin-script.c]

With gcc 8 we get new set of snprintf() warnings that breaks the
compilation, one example:

  tests/mem.c: In function ‘check’:
  tests/mem.c:19:48: error: ‘%s’ directive output may be truncated writing \
        up to 99 bytes into a region of size 89 [-Werror=format-truncation=]
    snprintf(failure, sizeof failure, "unexpected %s", out);

The gcc docs says:

 To avoid the warning either use a bigger buffer or handle the
 function's return value which indicates whether or not its output
 has been truncated.

Given that all these warnings are harmless, because the code either
properly fails due to uncomplete file path or we don't care for
truncated output at all, I'm changing all those snprintf() calls to
scnprintf(), which actually 'checks' for the snprint return value so the
gcc stays silent.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Link: http://lkml.kernel.org/r/20180319082902.4518-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Olsa 2020-06-30 23:45:58 +09:00 committed by Greg Kroah-Hartman
parent 666fe39b0e
commit f578600eba
6 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
tools/perf/builtin-script.c
View File

@ -1516,7 +1516,7 @@ static int is_directory(const char *base_path, const struct dirent *dent)
char path[PATH_MAX];
struct stat st;
sprintf(path, "%s/%s", base_path, dent->d_name);
scnprintf(path, PATH_MAX, "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return 0;
@ -1702,8 +1702,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
}
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@ -1712,8 +1712,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
script_root = get_script_root(script_dirent, REPORT_SUFFIX);
if (script_root) {
desc = script_desc__findnew(script_root);
snprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
scnprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
read_script_info(desc, script_path);
free(script_root);
}
@ -1749,7 +1749,7 @@ static int check_ev_match(char *dir_name, char *scriptname,
int match, len;
FILE *fp;
sprintf(filename, "%s/bin/%s-record", dir_name, scriptname);
scnprintf(filename, MAXPATHLEN, "%s/bin/%s-record", dir_name, scriptname);
fp = fopen(filename, "r");
if (!fp)
@ -1825,8 +1825,8 @@ int find_scripts(char **scripts_array, char **scripts_path_array)
}
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
lang_dirent->d_name);
#ifdef NO_LIBPERL
if (strstr(lang_path, "perl"))
continue;
@ -1881,8 +1881,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
return NULL;
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@ -1893,8 +1893,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
free(__script_root);
closedir(lang_dir);
closedir(scripts_dir);
snprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
scnprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
return strdup(script_path);
}
free(__script_root);

4
tools/perf/tests/attr.c
View File

@ -147,8 +147,8 @@ static int run_dir(const char *d, const char *perf)
if (verbose)
vcnt++;
snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
d, d, perf, vcnt, v);
scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
d, d, perf, vcnt, v);
return system(cmd) ? TEST_FAIL : TEST_OK;
}

2
tools/perf/tests/pmu.c
View File

@ -95,7 +95,7 @@ static char *test_format_dir_get(void)
struct test_format *format = &test_formats[i];
FILE *file;
snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
scnprintf(name, PATH_MAX, "%s/%s", dir, format->name);
file = fopen(name, "w");
if (!file)

2
tools/perf/util/cgroup.c
View File

@ -64,7 +64,7 @@ static int open_cgroup(char *name)
if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1))
return -1;
snprintf(path, PATH_MAX, "%s/%s", mnt, name);
scnprintf(path, PATH_MAX, "%s/%s", mnt, name);
fd = open(path, O_RDONLY);
if (fd == -1)

4
tools/perf/util/parse-events.c
View File

@ -195,8 +195,8 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
for_each_event(sys_dirent, evt_dir, evt_dirent) {
snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent->d_name);
scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent->d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;

2
tools/perf/util/pmu.c
View File

@ -325,7 +325,7 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
if (pmu_alias_info_file(name))
continue;
snprintf(path, PATH_MAX, "%s/%s", dir, name);
scnprintf(path, PATH_MAX, "%s/%s", dir, name);
file = fopen(path, "r");
if (!file) {