/* ELF executable support for BFD.
- Copyright (C) 1991-2019 Free Software Foundation, Inc.
+ Copyright (C) 1991-2021 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
/* PR 23657. Check for invalid section size, in sections with contents.
Note - we do not set an error value here because the contents
of this particular section might not be needed by the consumer. */
- if (dst->sh_type != SHT_NOBITS
- && dst->sh_size > bfd_get_file_size (abfd))
- _bfd_error_handler
- (_("warning: %pB has a corrupt section with a size (%" BFD_VMA_FMT "x) larger than the file size"),
- abfd, dst->sh_size);
+ if (dst->sh_type != SHT_NOBITS)
+ {
+ ufile_ptr filesize = bfd_get_file_size (abfd);
+
+ if (filesize != 0
+ && ((ufile_ptr) dst->sh_offset > filesize
+ || dst->sh_size > filesize - dst->sh_offset))
+ {
+ abfd->read_only = 1;
+ _bfd_error_handler (_("warning: %pB has a section "
+ "extending past end of file"), abfd);
+ }
+ }
dst->sh_link = H_GET_32 (abfd, src->sh_link);
dst->sh_info = H_GET_32 (abfd, src->sh_info);
dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign);
any side effects in ABFD, or any data it points to (like tdata), if the
file does not match the target vector. */
-const bfd_target *
+bfd_cleanup
elf_object_p (bfd *abfd)
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
/* If this is a relocatable file and there is no section header
table, then we're hosed. */
- if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL)
+ if (i_ehdrp->e_shoff < sizeof (x_ehdr) && i_ehdrp->e_type == ET_REL)
goto got_wrong_format_error;
/* As a simple sanity check, verify that what BFD thinks is the
goto got_wrong_format_error;
/* Further sanity check. */
- if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0)
+ if (i_ehdrp->e_shoff < sizeof (x_ehdr) && i_ehdrp->e_shnum != 0)
goto got_wrong_format_error;
ebd = get_elf_backend_data (abfd);
&& ebd->elf_osabi != ELFOSABI_NONE)
goto got_wrong_format_error;
- if (i_ehdrp->e_shoff != 0)
+ if (i_ehdrp->e_shoff >= sizeof (x_ehdr))
{
file_ptr where = (file_ptr) i_ehdrp->e_shoff;
{
Elf_Internal_Shdr *shdrp;
unsigned int num_sec;
+ size_t amt;
-#ifndef BFD64
- if (i_ehdrp->e_shnum > ((bfd_size_type) -1) / sizeof (*i_shdrp))
+ if (_bfd_mul_overflow (i_ehdrp->e_shnum, sizeof (*i_shdrp), &amt))
goto got_wrong_format_error;
-#endif
- i_shdrp = (Elf_Internal_Shdr *) bfd_alloc2 (abfd, i_ehdrp->e_shnum,
- sizeof (*i_shdrp));
+ i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt);
if (!i_shdrp)
goto got_no_match;
num_sec = i_ehdrp->e_shnum;
elf_numsections (abfd) = num_sec;
- elf_elfsections (abfd)
- = (Elf_Internal_Shdr **) bfd_alloc2 (abfd, num_sec, sizeof (i_shdrp));
+ if (_bfd_mul_overflow (num_sec, sizeof (i_shdrp), &amt))
+ goto got_wrong_format_error;
+ elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt);
if (!elf_elfsections (abfd))
goto got_no_match;
+ elf_tdata (abfd)->being_created = bfd_zalloc (abfd, num_sec);
+ if (!elf_tdata (abfd)->being_created)
+ goto got_no_match;
memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp));
for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++)
!= 0))
abfd->flags &= ~D_PAGED;
}
- }
- /* A further sanity check. */
- if (i_ehdrp->e_shnum != 0)
- {
if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)
|| i_shdrp[i_ehdrp->e_shstrndx].sh_type != SHT_STRTAB)
{
So we are kind, and reset the string index value to 0
so that at least some processing can be done. */
i_ehdrp->e_shstrndx = SHN_UNDEF;
+ abfd->read_only = 1;
_bfd_error_handler
(_("warning: %pB has a corrupt string table index - ignoring"),
abfd);
{
Elf_Internal_Phdr *i_phdr;
unsigned int i;
+ ufile_ptr filesize;
+ size_t amt;
-#ifndef BFD64
- if (i_ehdrp->e_phnum > ((bfd_size_type) -1) / sizeof (*i_phdr))
- goto got_wrong_format_error;
-#endif
/* Check for a corrupt input file with an impossibly large number
of program headers. */
- if (bfd_get_file_size (abfd) > 0
- && i_ehdrp->e_phnum > bfd_get_file_size (abfd))
- goto got_no_match;
+ filesize = bfd_get_file_size (abfd);
+ if (filesize != 0
+ && i_ehdrp->e_phnum > filesize / sizeof (Elf_External_Phdr))
+ goto got_wrong_format_error;
+ if (_bfd_mul_overflow (i_ehdrp->e_phnum, sizeof (*i_phdr), &amt))
+ goto got_wrong_format_error;
elf_tdata (abfd)->phdr
- = (Elf_Internal_Phdr *) bfd_alloc2 (abfd, i_ehdrp->e_phnum,
- sizeof (*i_phdr));
+ = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
if (elf_tdata (abfd)->phdr == NULL)
goto got_no_match;
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0)
if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr)
goto got_no_match;
elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
+ /* Too much code in BFD relies on alignment being a power of
+ two, as required by the ELF spec. */
+ if (i_phdr->p_align != (i_phdr->p_align & -i_phdr->p_align))
+ {
+ abfd->read_only = 1;
+ _bfd_error_handler (_("warning: %pB has a program header "
+ "with invalid alignment"), abfd);
+ }
}
}
- if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0)
+ if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff >= sizeof (x_ehdr))
{
unsigned int num_sec;
s->flags |= SEC_DEBUGGING;
}
}
- return target;
+ return _bfd_no_cleanup;
got_wrong_format_error:
bfd_set_error (bfd_error_wrong_format);
void
elf_write_relocs (bfd *abfd, asection *sec, void *data)
{
+ const struct elf_backend_data * const bed = get_elf_backend_data (abfd);
bfd_boolean *failedp = (bfd_boolean *) data;
Elf_Internal_Shdr *rela_hdr;
bfd_vma addr_offset;
unsigned int idx;
asymbol *last_sym;
int last_sym_idx;
+ size_t amt;
/* If we have already failed, don't do anything. */
if (*failedp)
rela_hdr = elf_section_data (sec)->rel.hdr;
rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count;
- rela_hdr->contents = (unsigned char *) bfd_alloc2 (abfd, sec->reloc_count,
- rela_hdr->sh_entsize);
- if (rela_hdr->contents == NULL)
+ if (_bfd_mul_overflow (sec->reloc_count, rela_hdr->sh_entsize, &amt)
+ || (rela_hdr->contents = bfd_alloc (abfd, amt)) == NULL)
{
+ bfd_set_error (bfd_error_no_memory);
*failedp = TRUE;
return;
}
src_rela.r_addend = ptr->addend;
(*swap_out) (abfd, &src_rela, dst_rela);
}
+
+ if (elf_section_data (sec)->has_secondary_relocs
+ && !bed->write_secondary_relocs (abfd, sec))
+ {
+ *failedp = TRUE;
+ return;
+ }
}
/* Write out the program headers. */
Elf_External_Shdr *x_shdrp; /* Section header table, external form */
Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */
unsigned int count;
- bfd_size_type amt;
+ size_t amt;
i_ehdrp = elf_elfheader (abfd);
i_shdrp = elf_elfsections (abfd);
i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx;
/* at this point we've concocted all the ELF sections... */
- x_shdrp = (Elf_External_Shdr *) bfd_alloc2 (abfd, i_ehdrp->e_shnum,
- sizeof (*x_shdrp));
+ if (_bfd_mul_overflow (i_ehdrp->e_shnum, sizeof (*x_shdrp), &amt))
+ {
+ bfd_set_error (bfd_error_no_memory);
+ return FALSE;
+ }
+ x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt);
if (!x_shdrp)
return FALSE;
if (contents != NULL)
{
(*process) (contents, i_shdr.sh_size, arg);
- if (free_contents != NULL)
- free (free_contents);
+ free (free_contents);
}
}
Elf_External_Versym *xver;
Elf_External_Versym *xverbuf = NULL;
const struct elf_backend_data *ebd;
+ size_t amt;
/* Read each raw ELF symbol, converting from external ELF form to
internal ELF form, and then using the information to create a
if (isymbuf == NULL)
return -1;
- symbase = (elf_symbol_type *) bfd_zalloc2 (abfd, symcount,
- sizeof (elf_symbol_type));
+ if (_bfd_mul_overflow (symcount, sizeof (elf_symbol_type), &amt))
+ {
+ bfd_set_error (bfd_error_file_too_big);
+ goto error_return;
+ }
+ symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt);
if (symbase == (elf_symbol_type *) NULL)
goto error_return;
{
if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0)
goto error_return;
-
- xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size);
+ xverbuf = (Elf_External_Versym *)
+ _bfd_malloc_and_read (abfd, verhdr->sh_size, verhdr->sh_size);
if (xverbuf == NULL && verhdr->sh_size != 0)
goto error_return;
-
- if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size)
- goto error_return;
}
/* Skip first symbol, which is a null dummy. */
{
/* This symbol is in a section for which we did not
create a BFD section. Just use bfd_abs_section,
- although it is wrong. FIXME. */
+ although it is wrong. FIXME. Note - there is
+ code in elf.c:swap_out_syms that calls
+ symbol_section_index() in the elf backend for
+ cases like this. */
sym->symbol.section = bfd_abs_section_ptr;
}
}
switch (ELF_ST_TYPE (isym->st_info))
{
case STT_SECTION:
- sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING;
+ /* Mark the input section symbol as used since it may be
+ used for relocation and section group.
+ NB: BSF_SECTION_SYM_USED is ignored by linker and may
+ be cleared by objcopy for non-relocatable inputs. */
+ sym->symbol.flags |= (BSF_SECTION_SYM
+ | BSF_DEBUGGING
+ | BSF_SECTION_SYM_USED);
break;
case STT_FILE:
sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING;
*symptrs = 0; /* Final null pointer */
}
- if (xverbuf != NULL)
- free (xverbuf);
- if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
+ free (xverbuf);
+ if (hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
return symcount;
-error_return:
- if (xverbuf != NULL)
- free (xverbuf);
- if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf)
+ error_return:
+ free (xverbuf);
+ if (hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
return -1;
}
int entsize;
unsigned int symcount;
- allocated = bfd_malloc (rel_hdr->sh_size);
+ if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
+ return FALSE;
+ allocated = _bfd_malloc_and_read (abfd, rel_hdr->sh_size, rel_hdr->sh_size);
if (allocated == NULL)
- goto error_return;
-
- if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
- || (bfd_bread (allocated, rel_hdr->sh_size, abfd)
- != rel_hdr->sh_size))
- goto error_return;
+ return FALSE;
native_relocs = (bfd_byte *) allocated;
goto error_return;
}
- if (allocated != NULL)
- free (allocated);
+ free (allocated);
return TRUE;
error_return:
- if (allocated != NULL)
- free (allocated);
+ free (allocated);
return FALSE;
}
asymbol **symbols,
bfd_boolean dynamic)
{
+ const struct elf_backend_data * const bed = get_elf_backend_data (abfd);
struct bfd_elf_section_data * const d = elf_section_data (asect);
Elf_Internal_Shdr *rel_hdr;
Elf_Internal_Shdr *rel_hdr2;
bfd_size_type reloc_count;
bfd_size_type reloc_count2;
arelent *relents;
+ size_t amt;
if (asect->relocation != NULL)
return TRUE;
reloc_count2 = 0;
}
- relents = (arelent *) bfd_alloc2 (abfd, reloc_count + reloc_count2,
- sizeof (arelent));
+ if (_bfd_mul_overflow (reloc_count + reloc_count2, sizeof (arelent), &amt))
+ {
+ bfd_set_error (bfd_error_file_too_big);
+ return FALSE;
+ }
+ relents = (arelent *) bfd_alloc (abfd, amt);
if (relents == NULL)
return FALSE;
symbols, dynamic))
return FALSE;
+ if (!bed->slurp_secondary_relocs (abfd, asect, symbols, dynamic))
+ return FALSE;
+
asect->relocation = relents;
return TRUE;
}
bfd *
NAME(_bfd_elf,bfd_from_remote_memory)
(bfd *templ,
- bfd_vma ehdr_vma,
- bfd_size_type size,
- bfd_vma *loadbasep,
+ bfd_vma ehdr_vma /* Bytes. */,
+ bfd_size_type size /* Octets. */,
+ bfd_vma *loadbasep /* Bytes. */,
int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type))
+ /* (Bytes , , octets ). */
{
Elf_External_Ehdr x_ehdr; /* Elf file header, external form */
Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */
unsigned int i;
bfd_vma high_offset;
bfd_vma shdr_end;
- bfd_vma loadbase;
+ bfd_vma loadbase; /* Bytes. */
+ size_t amt;
+ unsigned int opb = bfd_octets_per_byte (templ, NULL);
/* Read in the ELF header in external format. */
err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr);
return NULL;
}
- x_phdrs
- = (Elf_External_Phdr *) bfd_malloc2 (i_ehdr.e_phnum,
- sizeof (*x_phdrs) + sizeof (*i_phdrs));
+ if (_bfd_mul_overflow (i_ehdr.e_phnum,
+ sizeof (*x_phdrs) + sizeof (*i_phdrs), &amt))
+ {
+ bfd_set_error (bfd_error_file_too_big);
+ return NULL;
+ }
+ x_phdrs = (Elf_External_Phdr *) bfd_malloc (amt);
if (x_phdrs == NULL)
return NULL;
err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs,
header sits, then we can figure out the loadbase. */
if (first_phdr == NULL)
{
- bfd_vma p_offset = i_phdrs[i].p_offset;
- bfd_vma p_vaddr = i_phdrs[i].p_vaddr;
+ bfd_vma p_offset = i_phdrs[i].p_offset; /* Octets. */
+ bfd_vma p_vaddr = i_phdrs[i].p_vaddr; /* Octets. */
if (i_phdrs[i].p_align > 1)
{
- p_offset &= -i_phdrs[i].p_align;
- p_vaddr &= -i_phdrs[i].p_align;
+ p_offset &= -(i_phdrs[i].p_align * opb);
+ p_vaddr &= -(i_phdrs[i].p_align * opb);
}
if (p_offset == 0)
{
- loadbase = ehdr_vma - p_vaddr;
+ loadbase = ehdr_vma - p_vaddr / opb;
first_phdr = &i_phdrs[i];
}
}
for (i = 0; i < i_ehdr.e_phnum; ++i)
if (i_phdrs[i].p_type == PT_LOAD)
{
- bfd_vma start = i_phdrs[i].p_offset;
- bfd_vma end = start + i_phdrs[i].p_filesz;
- bfd_vma vaddr = i_phdrs[i].p_vaddr;
+ bfd_vma start = i_phdrs[i].p_offset; /* Octets. */
+ bfd_vma end = start + i_phdrs[i].p_filesz; /* Octets. */
+ bfd_vma vaddr = i_phdrs[i].p_vaddr; /* Octets. */
/* Extend the beginning of the first pt_load to cover file
header and program headers, if we proved earlier that its
/* Extend the end of the last pt_load to cover section headers. */
if (last_phdr == &i_phdrs[i])
end = high_offset;
- err = target_read_memory (loadbase + vaddr,
+ err = target_read_memory (loadbase + vaddr / opb,
contents + start, end - start);
if (err)
{
return NULL;
}
nbfd = _bfd_new_bfd ();
- if (nbfd == NULL)
+ if (nbfd == NULL
+ || !bfd_set_filename (nbfd, "<in-memory>"))
{
free (bim);
free (contents);
return NULL;
}
- nbfd->filename = xstrdup ("<in-memory>");
nbfd->xvec = templ->xvec;
bim->size = high_offset;
bim->buffer = contents;
projects / thirdparty / binutils-gdb.git / blobdiff