PR27716, build failure for msdosdjgpp: PATH_MAX undeclared

We shouldn't be using arbitrary limits like PATH_MAX in GNU programs.
This patch also fixes some memory leaks in readelf when processing
separate debug info.

	PR 27716
binutils/
	* objdump.c (show_line): Don't limit paths to PATH_MAX.
	* readelf.c (struct filedata): Change program_interpreter from
	a char array to a char pointer.
	(process_program_headers): Sanity check PT_INTERP p_filesz.
	Malloc program_interpreter using p_filesz and read directly from
	file.
	(process_dynamic_section): Check program_interpreter is non-NULL.
	(free_filedata): New function, split out from..
	(process_object): ..here.
	(close_debug_file): Call free_filedata.
	* sysdep.h: Don't include sys/param.h.
	(PATH_MAX): Don't define.
	* configure.ac: Don't check for sys/param.h.
	* configure: Regenerate.
gprof/
	* gprof.h (PATH_MAX): Don't define.
	* corefile.c (core_create_line_syms): Don't use PATH_MAX for initial
	file name size.
	* source.c (annotate_source): Malloc file name buffer.  Always
	trim off "-ann" when dos 8.3 annotate file matches original.
	* utils.c (print_name_only): Malloc file name buffer.

gprof/ChangeLog

@@ -1,3 +1,13 @@
+2021-04-14  Alan Modra  <amodra@gmail.com>
+
+	PR 27716
+	* gprof.h (PATH_MAX): Don't define.
+	* corefile.c (core_create_line_syms): Don't use PATH_MAX for initial
+	file name size.
+	* source.c (annotate_source): Malloc file name buffer.  Always
+	trim off "-ann" when dos 8.3 annotate file matches original.
+	* utils.c (print_name_only): Malloc file name buffer.
+
 2021-04-05  Alan Modra  <amodra@gmail.com>
 
 	* configure.ac: Check for sys/time.h and setitimer.  Don't invoke

gprof/corefile.c

@@ -781,8 +781,8 @@ core_create_line_syms (void)
 
      Of course, this is rather slow and it would be better if
      BFD would provide an iterator for enumerating all line infos.  */
-  prev_name_len = PATH_MAX;
-  prev_filename_len = PATH_MAX;
+  prev_name_len = 1024;
+  prev_filename_len = 1024;
   prev_name = (char *) xmalloc (prev_name_len);
   prev_filename = (char *) xmalloc (prev_filename_len);
   ltab.len = 0;

gprof/gprof.h

@@ -54,10 +54,6 @@
 /* AIX defines hz as a macro.  */
 #undef hz
 
-#ifndef PATH_MAX
-#define PATH_MAX	1024
-#endif
-
 #define	A_OUTNAME	"a.out"		/* default core filename */
 #define	GMONNAME	"gmon.out"	/* default profile filename */
 #define	GMONSUM		"gmon.sum"	/* profile summary filename */

gprof/source.c

@@ -97,14 +97,14 @@ annotate_source (Source_File *sf, unsigned int max_width,
   int i, line_num, nread;
   bool new_line;
   char buf[8192];
-  char fname[PATH_MAX];
+  char *fname;
   char *annotation, *name_only;
   FILE *ifp, *ofp;
   Search_List_Elem *sle = src_search_list.head;
 
   /* Open input file.  If open fails, walk along search-list until
      open succeeds or reaching end of list.  */
-  strcpy (fname, sf->name);
+  fname = (char *) sf->name;
 
   if (IS_ABSOLUTE_PATH (sf->name))
     sle = 0;			/* Don't use search list for absolute paths.  */
@@ -116,6 +116,8 @@ annotate_source (Source_File *sf, unsigned int max_width,
 			     sf->name, fname));
 
       ifp = fopen (fname, FOPEN_RB);
+      if (fname != sf->name)
+	free (fname);
       if (ifp)
 	break;
 
@@ -141,6 +143,8 @@ annotate_source (Source_File *sf, unsigned int max_width,
 
       if (sle)
 	{
+	  fname = xmalloc (strlen (sle->path) + 3
+			   + strlen (name_only ? name_only : sf->name));
 	  strcpy (fname, sle->path);
 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 	  /* d:foo is not the same thing as d:/foo!  */
@@ -191,6 +195,7 @@ annotate_source (Source_File *sf, unsigned int max_width,
       else
 	filename = sf->name;
 
+      fname = xmalloc (strlen (filename) + strlen (EXT_ANNO) + 1);
       strcpy (fname, filename);
       strcat (fname, EXT_ANNO);
 #ifdef __MSDOS__
@@ -205,9 +210,9 @@ annotate_source (Source_File *sf, unsigned int max_width,
 	  {
 	    char *dot = strrchr (fname, '.');
 
-	    if (dot)
-	      *dot = '\0';
-	    strcat (fname, ".ann");
+	    if (!dot)
+	      dot = fname + strlen (filename);
+	    strcpy (dot, ".ann");
 	  }
       }
 #endif
@@ -216,8 +221,10 @@ annotate_source (Source_File *sf, unsigned int max_width,
       if (!ofp)
 	{
 	  perror (fname);
+	  free (fname);
 	  return 0;
 	}
+      free (fname);
     }
 
   /* Print file names if output goes to stdout

gprof/utils.c

@@ -43,9 +43,7 @@ int
 print_name_only (Sym *self)
 {
   const char *name = self->name;
-  const char *filename;
   char *demangled = 0;
-  char buf[PATH_MAX];
   int size = 0;
 
   if (name)
@@ -60,7 +58,9 @@ print_name_only (Sym *self)
       size = strlen (name);
       if ((line_granularity || inline_file_names) && self->file)
 	{
-	  filename = self->file->name;
+	  const char *filename = self->file->name;
+	  char *buf;
+
 	  if (!print_path)
 	    {
 	      filename = strrchr (filename, '/');
@@ -73,6 +73,7 @@ print_name_only (Sym *self)
 		  filename = self->file->name;
 		}
 	    }
+	  buf = xmalloc (strlen (filename) + 8 + 20 + 16);
 	  if (line_granularity)
 	    {
 	      sprintf (buf, " (%s:%d @ %lx)", filename, self->line_num,
@@ -84,6 +85,7 @@ print_name_only (Sym *self)
 	    }
 	  printf ("%s", buf);
 	  size += strlen (buf);
+	  free (buf);
 	}
       free (demangled);
       DBG (DFNDEBUG, printf ("{%d} ", self->cg.top_order));