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GAS: Do not create an entry for the default directory if the directory table is empty. Improve readelf's decoding of empty directory and file name tables.

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PR 25917
	* dwarf.c (display_debug_lines_decoded): Warn if encountering a
	supicious number of entries for DWARF-5 format directory and file
	name tables.  Do not display file name table header if the table
	is empty.  Do not allocate space for empty tables.
This commit is contained in:
Nick Clifton 2020-05-04 13:50:05 +01:00
parent fe05f369f0
commit 070b775f03
4 changed files with 35 additions and 11 deletions
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28
binutils/dwarf.c
View file

@ -4343,6 +4343,8 @@ display_debug_lines_decoded (struct dwarf_section * section,
/* Skip directories format. */
SAFE_BYTE_GET_AND_INC (format_count, data, 1, end);
if (format_count > 1)
warn ("Unexpectedly large number of columns in the directory name table (%u)\n", format_count);
format_start = data;
for (formati = 0; formati < format_count; formati++)
{
@ -4357,8 +4359,11 @@ display_debug_lines_decoded (struct dwarf_section * section,
break;
}
directory_table = (unsigned char **)
xmalloc (n_directories * sizeof (unsigned char *));
if (n_directories == 0)
directory_table = NULL;
else
directory_table = (unsigned char **)
xmalloc (n_directories * sizeof (unsigned char *));
for (entryi = 0; entryi < n_directories; entryi++)
{
@ -4411,6 +4416,9 @@ display_debug_lines_decoded (struct dwarf_section * section,
/* Skip files format. */
SAFE_BYTE_GET_AND_INC (format_count, data, 1, end);
if (format_count > 5)
warn ("Unexpectedly large number of columns in the file name table (%u)\n", format_count);
format_count = 2;
format_start = data;
for (formati = 0; formati < format_count; formati++)
{
@ -4419,14 +4427,17 @@ display_debug_lines_decoded (struct dwarf_section * section,
}
READ_ULEB (n_files, data, end);
if (data == end)
if (data == end && n_files > 0)
{
warn (_("Corrupt file name list\n"));
break;
}
file_table = (File_Entry *) xcalloc (1, n_files
* sizeof (File_Entry));
if (n_files == 0)
file_table = NULL;
else
file_table = (File_Entry *) xcalloc (1, n_files
* sizeof (File_Entry));
for (entryi = 0; entryi < n_files; entryi++)
{
@ -4582,7 +4593,7 @@ display_debug_lines_decoded (struct dwarf_section * section,
/* Print the Compilation Unit's name and a header. */
if (file_table == NULL)
;
printf (_("CU: No directory table\n"));
else if (directory_table == NULL)
printf (_("CU: %s:\n"), file_table[0].name);
else
@ -4610,7 +4621,10 @@ display_debug_lines_decoded (struct dwarf_section * section,
printf ("%s:\n", file_table[0].name);
}
printf (_("File name Line number Starting address View Stmt\n"));
if (n_files > 0)
printf (_("File name Line number Starting address View Stmt\n"));
else
printf (_("CU: Empty file name table\n"));
saved_linfo = linfo;
}