diff options
Diffstat (limited to 'ld/pe-dll.c')
| -rw-r--r-- | ld/pe-dll.c | 78 |
1 files changed, 51 insertions, 27 deletions
diff --git a/ld/pe-dll.c b/ld/pe-dll.c index 65bb50b..df08a57 100644 --- a/ld/pe-dll.c +++ b/ld/pe-dll.c @@ -3419,22 +3419,30 @@ pe_process_import_defs (bfd *output_bfd, struct bfd_link_info *linfo) handled, FALSE if not. */ static unsigned int -pe_get16 (bfd *abfd, int where) +pe_get16 (bfd *abfd, int where, bool *fail) { unsigned char b[2]; - bfd_seek (abfd, where, SEEK_SET); - bfd_read (b, 2, abfd); + if (bfd_seek (abfd, where, SEEK_SET) != 0 + || bfd_read (b, 2, abfd) != 2) + { + *fail = true; + return 0; + } return b[0] + (b[1] << 8); } static unsigned int -pe_get32 (bfd *abfd, int where) +pe_get32 (bfd *abfd, int where, bool *fail) { unsigned char b[4]; - bfd_seek (abfd, where, SEEK_SET); - bfd_read (b, 4, abfd); + if (bfd_seek (abfd, where, SEEK_SET) != 0 + || bfd_read (b, 4, abfd) != 4) + { + *fail = true; + return 0; + } return b[0] + (b[1] << 8) + (b[2] << 16) + ((unsigned) b[3] << 24); } @@ -3481,38 +3489,49 @@ pe_implied_import_dll (const char *filename) /* PEI dlls seem to be bfd_objects. */ if (!bfd_check_format (dll, bfd_object)) { + notdll: einfo (_("%X%P: %s: this doesn't appear to be a DLL\n"), filename); return false; } /* Get pe_header, optional header and numbers of directory entries. */ - pe_header_offset = pe_get32 (dll, 0x3c); + bool fail = false; + pe_header_offset = pe_get32 (dll, 0x3c, &fail); + if (fail) + goto notdll; opthdr_ofs = pe_header_offset + 4 + 20; #ifdef pe_use_plus - num_entries = pe_get32 (dll, opthdr_ofs + 92 + 4 * 4); /* & NumberOfRvaAndSizes. */ + /* NumberOfRvaAndSizes. */ + num_entries = pe_get32 (dll, opthdr_ofs + 92 + 4 * 4, &fail); #else - num_entries = pe_get32 (dll, opthdr_ofs + 92); + num_entries = pe_get32 (dll, opthdr_ofs + 92, &fail); #endif + if (fail) + goto notdll; /* No import or export directory entry. */ if (num_entries < 1) return false; #ifdef pe_use_plus - export_rva = pe_get32 (dll, opthdr_ofs + 96 + 4 * 4); - export_size = pe_get32 (dll, opthdr_ofs + 100 + 4 * 4); + export_rva = pe_get32 (dll, opthdr_ofs + 96 + 4 * 4, &fail); + export_size = pe_get32 (dll, opthdr_ofs + 100 + 4 * 4, &fail); #else - export_rva = pe_get32 (dll, opthdr_ofs + 96); - export_size = pe_get32 (dll, opthdr_ofs + 100); + export_rva = pe_get32 (dll, opthdr_ofs + 96, &fail); + export_size = pe_get32 (dll, opthdr_ofs + 100, &fail); #endif + if (fail) + goto notdll; /* No export table - nothing to export. */ if (export_size == 0) return false; - nsections = pe_get16 (dll, pe_header_offset + 4 + 2); + nsections = pe_get16 (dll, pe_header_offset + 4 + 2, &fail); secptr = (pe_header_offset + 4 + 20 + - pe_get16 (dll, pe_header_offset + 4 + 16)); + pe_get16 (dll, pe_header_offset + 4 + 16, &fail)); + if (fail) + goto notdll; expptr = 0; /* Get the rva and size of the export section. */ @@ -3520,12 +3539,14 @@ pe_implied_import_dll (const char *filename) { char sname[8]; bfd_vma secptr1 = secptr + 40 * i; - bfd_vma vaddr = pe_get32 (dll, secptr1 + 12); - bfd_vma vsize = pe_get32 (dll, secptr1 + 16); - bfd_vma fptr = pe_get32 (dll, secptr1 + 20); + bfd_vma vaddr = pe_get32 (dll, secptr1 + 12, &fail); + bfd_vma vsize = pe_get32 (dll, secptr1 + 16, &fail); + bfd_vma fptr = pe_get32 (dll, secptr1 + 20, &fail); - bfd_seek (dll, secptr1, SEEK_SET); - bfd_read (sname, 8, dll); + if (fail + || bfd_seek (dll, secptr1, SEEK_SET) != 0 + || bfd_read (sname, 8, dll) != 8) + goto notdll; if (vaddr <= export_rva && vaddr + vsize > export_rva) { @@ -3541,14 +3562,16 @@ pe_implied_import_dll (const char *filename) for (i = 0; i < nsections; i++) { bfd_vma secptr1 = secptr + 40 * i; - bfd_vma vsize = pe_get32 (dll, secptr1 + 8); - bfd_vma vaddr = pe_get32 (dll, secptr1 + 12); - bfd_vma flags = pe_get32 (dll, secptr1 + 36); + bfd_vma vsize = pe_get32 (dll, secptr1 + 8, &fail); + bfd_vma vaddr = pe_get32 (dll, secptr1 + 12, &fail); + bfd_vma flags = pe_get32 (dll, secptr1 + 36, &fail); char sec_name[9]; sec_name[8] = '\0'; - bfd_seek (dll, secptr1 + 0, SEEK_SET); - bfd_read (sec_name, 8, dll); + if (fail + || bfd_seek (dll, secptr1 + 0, SEEK_SET) != 0 + || bfd_read (sec_name, 8, dll) != 8) + goto notdll; if (strcmp(sec_name,".data") == 0) { @@ -3583,8 +3606,9 @@ pe_implied_import_dll (const char *filename) } expdata = xmalloc (export_size); - bfd_seek (dll, expptr, SEEK_SET); - bfd_read (expdata, export_size, dll); + if (bfd_seek (dll, expptr, SEEK_SET) != 0 + || bfd_read (expdata, export_size, dll) != export_size) + goto notdll; erva = (char *) expdata - export_rva; if (pe_def_file == 0) |