• Arnaldo Carvalho de Melo's avatar
    perf thread_map: Correctly size buffer used with dirent->dt_name · 05523785
    Arnaldo Carvalho de Melo authored
    commit bdf23a9a upstream.
    
    The size of dirent->dt_name is NAME_MAX + 1, but the size for the 'path'
    buffer is hard coded at 256, which may truncate it because we also
    prepend "/proc/", so that all that into account and thank gcc 7 for this
    warning:
    
      /git/linux/tools/perf/util/thread_map.c: In function 'thread_map__new_by_uid':
      /git/linux/tools/perf/util/thread_map.c:119:39: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 250 [-Werror=format-truncation=]
         snprintf(path, sizeof(path), "/proc/%s", dirent->d_name);
                                             ^~
      In file included from /usr/include/stdio.h:939:0,
                       from /git/linux/tools/perf/util/thread_map.c:5:
      /usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' output between 7 and 262 bytes into a destination of size 256
         return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              __bos (__s), __fmt, __va_arg_pack ());
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: http://lkml.kernel.org/n/tip-csy0r8zrvz5efccgd4k12c82@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    05523785
thread_map.c 9.05 KB