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PR22361 readelf buffer overflow on fuzzed archive header

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PR 22361
	* readelf.c (process_archive_index_and_symbols): Ensure ar_size
	field is zero terminated for strtoul.
	(setup_archive, get_archive_member_name): Likewise.
This commit is contained in:
Alan Modra
2017-10-28 21:31:16 +10:30
parent c0e331c794
commit d91f0b20e5
2 changed files with 18 additions and 0 deletions
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11
binutils/elfcomm.c
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@ -466,8 +466,12 @@ process_archive_index_and_symbols (struct archive_info * arch,
{
size_t got;
unsigned long size;
char fmag_save;
fmag_save = arch->arhdr.ar_fmag[0];
arch->arhdr.ar_fmag[0] = 0;
size = strtoul (arch->arhdr.ar_size, NULL, 10);
arch->arhdr.ar_fmag[0] = fmag_save;
/* PR 17531: file: 912bd7de. */
if ((signed long) size < 0)
{
@ -655,7 +659,10 @@ setup_archive (struct archive_info *arch, const char *file_name,
if (const_strneq (arch->arhdr.ar_name, "// "))
{
/* This is the archive string table holding long member names. */
char fmag_save = arch->arhdr.ar_fmag[0];
arch->arhdr.ar_fmag[0] = 0;
arch->longnames_size = strtoul (arch->arhdr.ar_size, NULL, 10);
arch->arhdr.ar_fmag[0] = fmag_save;
/* PR 17531: file: 01068045. */
if (arch->longnames_size < 8)
{
@ -758,6 +765,7 @@ get_archive_member_name (struct archive_info *arch,
char *endp;
char *member_file_name;
char *member_name;
char fmag_save;
if (arch->longnames == NULL || arch->longnames_size == 0)
{
@ -766,9 +774,12 @@ get_archive_member_name (struct archive_info *arch,
}
arch->nested_member_origin = 0;
fmag_save = arch->arhdr.ar_fmag[0];
arch->arhdr.ar_fmag[0] = 0;
k = j = strtoul (arch->arhdr.ar_name + 1, &endp, 10);
if (arch->is_thin_archive && endp != NULL && * endp == ':')
arch->nested_member_origin = strtoul (endp + 1, NULL, 10);
arch->arhdr.ar_fmag[0] = fmag_save;
if (j > arch->longnames_size)
{