[glibc] Handle DT_UNKNOWN in gconv-modules.d

[glibc] Handle DT_UNKNOWN in gconv-modules.d

[Siddhesh Poyarekar]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f3629a4be82a393ff56646c388da2fda0101f557

commit f3629a4be82a393ff56646c388da2fda0101f557
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Thu Jun 10 14:56:37 2021 +0530

    Handle DT_UNKNOWN in gconv-modules.d
    
    On filesystems that do not support dt_type, a regular file shows up as
    DT_UNKNOWN.  Fall back to using lstat64 to read file properties in
    such cases.
    
    Reviewed-by: DJ Delorie <dj@redhat.com>

Diff:
---
 iconv/gconv_parseconfdir.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/iconv/gconv_parseconfdir.h b/iconv/gconv_parseconfdir.h
index 3d4d58d4be..e73ea0ff5c 100644
--- a/iconv/gconv_parseconfdir.h
+++ b/iconv/gconv_parseconfdir.h
@@ -32,6 +32,7 @@
 # define readdir __readdir
 # define closedir __closedir
 # define mempcpy __mempcpy
+# define lstat64 __lstat64
 #endif
 
 /* Name of the file containing the module information in the directories
@@ -138,7 +139,7 @@ gconv_parseconfdir (const char *dir, size_t dir_len)
       struct dirent *ent;
       while ((ent = readdir (confdir)) != NULL)
 	{
-	  if (ent->d_type != DT_REG)
+	  if (ent->d_type != DT_REG && ent->d_type != DT_UNKNOWN)
 	    continue;
 
 	  size_t len = strlen (ent->d_name);
@@ -148,8 +149,14 @@ gconv_parseconfdir (const char *dir, size_t dir_len)
 	      && strcmp (ent->d_name + len - strlen (suffix), suffix) == 0)
 	    {
 	      char *conf;
+	      struct stat64 st;
 	      if (asprintf (&conf, "%s/%s", buf, ent->d_name) < 0)
 		continue;
+	      if (ent->d_type == DT_UNKNOWN
+		  && (lstat64 (conf, &st) == -1
+		      || !S_ISREG (st.st_mode)))
+		continue;
+
 	      found |= read_conf_file (conf, dir, dir_len);
 	      free (conf);
 	    }