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Archive sanity checks
Adds some sanity checking to size values read from file. * archive.c (do_slurp_bsd_armap): Increase minimum parsed_size, and bfd_set_error on failing test. Don't bother changing bfd_error on file read error. Check symdef_count is multiple of BSD_SYMDEF_SIZE. Check sym name is within string buffer. Use size_t for some vars. (do_slurp_coff_armap): Use size_t for some variables, fix size of int_buf. Don't change bfd_error on file read error. Use _bfd_mul_overflow when calculating carsym buffer size. Reorder calculations to catch overflows before they occur. malloc and free raw armap rather than using bfd_alloc. Read raw armap before allocating carsym+strings buffer. (_bfd_slurp_extended_name_table): Localize variables. Check name size against file size.
This commit is contained in:
Alan Modra
@ -1,3 +1,18 @@
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2020-02-26 Alan Modra <amodra@gmail.com>
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* archive.c (do_slurp_bsd_armap): Increase minimum parsed_size, and
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bfd_set_error on failing test. Don't bother changing bfd_error on
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file read error. Check symdef_count is multiple of BSD_SYMDEF_SIZE.
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Check sym name is within string buffer. Use size_t for some vars.
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(do_slurp_coff_armap): Use size_t for some variables, fix size of
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int_buf. Don't change bfd_error on file read error. Use
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_bfd_mul_overflow when calculating carsym buffer size. Reorder
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calculations to catch overflows before they occur. malloc and
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free raw armap rather than using bfd_alloc. Read raw armap before
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allocating carsym+strings buffer.
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(_bfd_slurp_extended_name_table): Localize variables. Check
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name size against file size.
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2020-02-26 Alan Modra <amodra@gmail.com>
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* vms-lib.c (vms_lib_read_index): Release correct buffer.
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156
bfd/archive.c
156
bfd/archive.c
@ -951,11 +951,12 @@ static bfd_boolean
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do_slurp_bsd_armap (bfd *abfd)
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{
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struct areltdata *mapdata;
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unsigned int counter;
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size_t counter;
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bfd_byte *raw_armap, *rbase;
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struct artdata *ardata = bfd_ardata (abfd);
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char *stringbase;
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bfd_size_type parsed_size, amt;
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bfd_size_type parsed_size;
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size_t amt, string_size;
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carsym *set;
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mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
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@ -965,44 +966,51 @@ do_slurp_bsd_armap (bfd *abfd)
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free (mapdata);
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/* PR 17512: file: 883ff754. */
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/* PR 17512: file: 0458885f. */
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if (parsed_size < 4)
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return FALSE;
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if (parsed_size < BSD_SYMDEF_COUNT_SIZE + BSD_STRING_COUNT_SIZE)
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{
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bfd_set_error (bfd_error_malformed_archive);
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return FALSE;
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}
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raw_armap = (bfd_byte *) _bfd_alloc_and_read (abfd, parsed_size, parsed_size);
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if (raw_armap == NULL)
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_malformed_archive);
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return FALSE;
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}
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return FALSE;
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ardata->symdef_count = H_GET_32 (abfd, raw_armap) / BSD_SYMDEF_SIZE;
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if (ardata->symdef_count * BSD_SYMDEF_SIZE >
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parsed_size - BSD_SYMDEF_COUNT_SIZE)
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parsed_size -= BSD_SYMDEF_COUNT_SIZE + BSD_STRING_COUNT_SIZE;
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amt = H_GET_32 (abfd, raw_armap);
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if (amt > parsed_size
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|| amt % BSD_SYMDEF_SIZE != 0)
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{
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/* Probably we're using the wrong byte ordering. */
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bfd_set_error (bfd_error_wrong_format);
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bfd_release (abfd, raw_armap);
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return FALSE;
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goto release_armap;
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}
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rbase = raw_armap + BSD_SYMDEF_COUNT_SIZE;
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stringbase = ((char *) rbase
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+ ardata->symdef_count * BSD_SYMDEF_SIZE
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+ BSD_STRING_COUNT_SIZE);
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amt = ardata->symdef_count * sizeof (carsym);
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stringbase = (char *) rbase + amt + BSD_STRING_COUNT_SIZE;
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string_size = parsed_size - amt;
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ardata->symdef_count = amt / BSD_SYMDEF_SIZE;
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if (_bfd_mul_overflow (ardata->symdef_count, sizeof (carsym), &amt))
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{
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bfd_set_error (bfd_error_no_memory);
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goto release_armap;
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}
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ardata->symdefs = (struct carsym *) bfd_alloc (abfd, amt);
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if (!ardata->symdefs)
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{
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bfd_release (abfd, raw_armap);
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return FALSE;
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}
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goto release_armap;
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for (counter = 0, set = ardata->symdefs;
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counter < ardata->symdef_count;
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counter++, set++, rbase += BSD_SYMDEF_SIZE)
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{
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set->name = H_GET_32 (abfd, rbase) + stringbase;
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unsigned nameoff = H_GET_32 (abfd, rbase);
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if (nameoff >= string_size)
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{
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bfd_set_error (bfd_error_malformed_archive);
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goto release_armap;
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}
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set->name = stringbase + nameoff;
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set->file_offset = H_GET_32 (abfd, rbase + BSD_SYMDEF_OFFSET_SIZE);
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}
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@ -1014,6 +1022,12 @@ do_slurp_bsd_armap (bfd *abfd)
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to be allocated on an objalloc anyway... */
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abfd->has_armap = TRUE;
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return TRUE;
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release_armap:
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ardata->symdef_count = 0;
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ardata->symdefs = NULL;
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bfd_release (abfd, raw_armap);
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return FALSE;
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}
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/* Read a COFF archive symbol table. Returns FALSE on error, TRUE
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@ -1029,12 +1043,12 @@ do_slurp_coff_armap (bfd *abfd)
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char *stringend;
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bfd_size_type stringsize;
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bfd_size_type parsed_size;
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ufile_ptr filesize;
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size_t nsymz, carsym_size, ptrsize, i;
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carsym *carsyms;
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bfd_size_type nsymz; /* Number of symbols in armap. */
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bfd_vma (*swap) (const void *);
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char int_buf[sizeof (long)];
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bfd_size_type carsym_size, ptrsize;
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unsigned int i;
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char int_buf[4];
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struct areltdata *tmp;
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mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
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if (mapdata == NULL)
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@ -1043,28 +1057,33 @@ do_slurp_coff_armap (bfd *abfd)
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free (mapdata);
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if (bfd_bread (int_buf, 4, abfd) != 4)
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_malformed_archive);
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return FALSE;
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}
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return FALSE;
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/* It seems that all numeric information in a coff archive is always
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in big endian format, nomatter the host or target. */
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in big endian format, no matter the host or target. */
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swap = bfd_getb32;
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nsymz = bfd_getb32 (int_buf);
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stringsize = parsed_size - (4 * nsymz) - 4;
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/* The coff armap must be read sequentially. So we construct a
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bsd-style one in core all at once, for simplicity. */
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if (nsymz > ~ (bfd_size_type) 0 / sizeof (carsym))
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if (_bfd_mul_overflow (nsymz, sizeof (carsym), &carsym_size))
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{
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bfd_set_error (bfd_error_no_memory);
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return FALSE;
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}
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carsym_size = (nsymz * sizeof (carsym));
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ptrsize = (4 * nsymz);
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filesize = bfd_get_file_size (abfd);
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ptrsize = 4 * nsymz;
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if ((filesize != 0 && parsed_size > filesize)
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|| parsed_size < 4
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|| parsed_size - 4 < ptrsize)
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{
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bfd_set_error (bfd_error_malformed_archive);
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return FALSE;
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}
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stringsize = parsed_size - ptrsize - 4;
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if (carsym_size + stringsize + 1 <= carsym_size)
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{
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@ -1072,22 +1091,20 @@ do_slurp_coff_armap (bfd *abfd)
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return FALSE;
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}
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/* Allocate and read in the raw offsets. */
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raw_armap = (int *) _bfd_malloc_and_read (abfd, ptrsize, ptrsize);
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if (raw_armap == NULL)
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return FALSE;
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ardata->symdefs = (struct carsym *) bfd_alloc (abfd,
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carsym_size + stringsize + 1);
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if (ardata->symdefs == NULL)
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return FALSE;
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goto free_armap;
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carsyms = ardata->symdefs;
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stringbase = ((char *) ardata->symdefs) + carsym_size;
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/* Allocate and read in the raw offsets. */
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raw_armap = (int *) _bfd_alloc_and_read (abfd, ptrsize, ptrsize);
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if (raw_armap == NULL
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|| (bfd_bread (stringbase, stringsize, abfd) != stringsize))
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_malformed_archive);
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goto release_symdefs;
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}
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if (bfd_bread (stringbase, stringsize, abfd) != stringsize)
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goto release_symdefs;
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/* OK, build the carsyms. */
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stringend = stringbase + stringsize;
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@ -1107,32 +1124,29 @@ do_slurp_coff_armap (bfd *abfd)
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ardata->first_file_filepos = bfd_tell (abfd);
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/* Pad to an even boundary if you have to. */
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ardata->first_file_filepos += (ardata->first_file_filepos) % 2;
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if (bfd_seek (abfd, ardata->first_file_filepos, SEEK_SET) != 0)
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goto release_symdefs;
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abfd->has_armap = TRUE;
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bfd_release (abfd, raw_armap);
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free (raw_armap);
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/* Check for a second archive header (as used by PE). */
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{
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struct areltdata *tmp;
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bfd_seek (abfd, ardata->first_file_filepos, SEEK_SET);
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tmp = (struct areltdata *) _bfd_read_ar_hdr (abfd);
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if (tmp != NULL)
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{
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if (tmp->arch_header[0] == '/'
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&& tmp->arch_header[1] == ' ')
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{
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ardata->first_file_filepos +=
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(tmp->parsed_size + sizeof (struct ar_hdr) + 1) & ~(unsigned) 1;
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}
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free (tmp);
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}
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}
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tmp = (struct areltdata *) _bfd_read_ar_hdr (abfd);
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if (tmp != NULL)
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{
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if (tmp->arch_header[0] == '/'
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&& tmp->arch_header[1] == ' ')
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ardata->first_file_filepos
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+= (tmp->parsed_size + sizeof (struct ar_hdr) + 1) & ~(unsigned) 1;
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free (tmp);
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}
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return TRUE;
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release_symdefs:
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bfd_release (abfd, (ardata)->symdefs);
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free_armap:
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free (raw_armap);
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return FALSE;
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}
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@ -1209,8 +1223,6 @@ bfd_boolean
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_bfd_slurp_extended_name_table (bfd *abfd)
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{
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char nextname[17];
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struct areltdata *namedata;
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bfd_size_type amt;
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/* FIXME: Formatting sucks here, and in case of failure of BFD_READ,
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we probably don't want to return TRUE. */
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@ -1219,6 +1231,10 @@ _bfd_slurp_extended_name_table (bfd *abfd)
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if (bfd_bread (nextname, 16, abfd) == 16)
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{
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struct areltdata *namedata;
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bfd_size_type amt;
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ufile_ptr filesize;
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if (bfd_seek (abfd, (file_ptr) -16, SEEK_CUR) != 0)
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return FALSE;
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@ -1234,9 +1250,13 @@ _bfd_slurp_extended_name_table (bfd *abfd)
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if (namedata == NULL)
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return FALSE;
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filesize = bfd_get_file_size (abfd);
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amt = namedata->parsed_size;
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if (amt + 1 == 0)
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goto byebye;
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if (amt + 1 == 0 || (filesize != 0 && amt > filesize))
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{
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bfd_set_error (bfd_error_malformed_archive);
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goto byebye;
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}
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bfd_ardata (abfd)->extended_names_size = amt;
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bfd_ardata (abfd)->extended_names = (char *) bfd_alloc (abfd, amt + 1);
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