/* ELF executable support for BFD.
- Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
- Free Software Foundation, Inc.
+ Copyright (C) 1991-2020 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support, from information published
in "UNIX System V Release 4, Programmers Guide: ANSI C and
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
+#include "libiberty.h"
/* Renaming structures, typedefs, macros and functions to be size-specific. */
#define Elf_External_Ehdr NAME(Elf,External_Ehdr)
dst->sh_addr = H_GET_WORD (abfd, src->sh_addr);
dst->sh_offset = H_GET_WORD (abfd, src->sh_offset);
dst->sh_size = H_GET_WORD (abfd, src->sh_size);
+ /* 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)
+ {
+ ufile_ptr filesize = bfd_get_file_size (abfd);
+
+ if (filesize != 0 && dst->sh_size > filesize)
+ _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);
+ }
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 */
Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */
unsigned int shindex;
const struct elf_backend_data *ebd;
- struct bfd_preserve preserve;
asection *s;
- bfd_size_type amt;
const bfd_target *target;
- preserve.marker = NULL;
-
/* Read in the ELF header in external format. */
if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
goto got_wrong_format_error;
}
- if (!bfd_preserve_save (abfd, &preserve))
- goto got_no_match;
-
target = abfd->xvec;
/* Allocate an instance of the elf_obj_tdata structure and hook it up to
if (! (*target->_bfd_set_format[bfd_object]) (abfd))
goto got_no_match;
- preserve.marker = elf_tdata (abfd);
/* Now that we know the byte order, swap in the rest of the header */
i_ehdrp = elf_elfheader (abfd);
if (i_ehdrp->e_shoff != 0)
{
- bfd_signed_vma where = i_ehdrp->e_shoff;
-
- if (where != (file_ptr) where)
- goto got_wrong_format_error;
+ file_ptr where = (file_ptr) i_ehdrp->e_shoff;
/* Seek to the section header table in the file. */
- if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
goto got_no_match;
/* Read the first section header at index 0, and convert to internal
if (i_ehdrp->e_shnum == SHN_UNDEF)
{
i_ehdrp->e_shnum = i_shdr.sh_size;
- if (i_ehdrp->e_shnum != i_shdr.sh_size
- || i_ehdrp->e_shnum == 0)
+ if (i_ehdrp->e_shnum >= SHN_LORESERVE
+ || i_ehdrp->e_shnum != i_shdr.sh_size
+ || i_ehdrp->e_shnum == 0)
goto got_wrong_format_error;
}
goto got_wrong_format_error;
where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr);
- if (where != (file_ptr) where)
- goto got_wrong_format_error;
if ((bfd_size_type) where <= i_ehdrp->e_shoff)
goto got_wrong_format_error;
- if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
goto got_no_match;
if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr))
goto got_no_match;
/* Back to where we were. */
where = i_ehdrp->e_shoff + sizeof (x_shdr);
- if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0)
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
goto got_no_match;
}
}
{
Elf_Internal_Shdr *shdrp;
unsigned int num_sec;
+ size_t amt;
- amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum;
+ if (_bfd_mul_overflow (i_ehdrp->e_shnum, sizeof (*i_shdrp), &amt))
+ goto got_wrong_format_error;
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;
- amt = sizeof (i_shdrp) * num_sec;
+ 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;
switch (ebd->elf_machine_code)
{
case EM_386:
- case EM_486:
+ case EM_IAMCU:
case EM_X86_64:
case EM_OLD_SPARCV9:
case EM_SPARC32PLUS:
!= 0))
abfd->flags &= ~D_PAGED;
}
- }
- /* A further sanity check. */
- if (i_ehdrp->e_shnum != 0)
- {
- if (i_ehdrp->e_shstrndx >= elf_numsections (abfd))
+ if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)
+ || i_shdrp[i_ehdrp->e_shstrndx].sh_type != SHT_STRTAB)
{
/* PR 2257:
We used to just goto got_wrong_format_error here
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;
- _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename);
+ _bfd_error_handler
+ (_("warning: %pB has a corrupt string table index - ignoring"),
+ abfd);
}
}
else if (i_ehdrp->e_shstrndx != SHN_UNDEF)
{
Elf_Internal_Phdr *i_phdr;
unsigned int i;
-
- amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr);
- elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
+ ufile_ptr filesize;
+ size_t amt;
+
+ /* Check for a corrupt input file with an impossibly large number
+ of program headers. */
+ 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_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)
s->flags |= SEC_DEBUGGING;
}
}
-
- bfd_preserve_finish (abfd, &preserve);
- return target;
+ return _bfd_no_cleanup;
got_wrong_format_error:
- /* There is way too much undoing of half-known state here. The caller,
- bfd_check_format_matches, really shouldn't iterate on live bfd's to
- check match/no-match like it does. We have to rely on that a call to
- bfd_default_set_arch_mach with the previously known mach, undoes what
- was done by the first bfd_default_set_arch_mach (with mach 0) here.
- For this to work, only elf-data and the mach may be changed by the
- target-specific elf_backend_object_p function. Note that saving the
- whole bfd here and restoring it would be even worse; the first thing
- you notice is that the cached bfd file position gets out of sync. */
bfd_set_error (bfd_error_wrong_format);
got_no_match:
- if (preserve.marker != NULL)
- bfd_preserve_restore (abfd, &preserve);
return NULL;
}
\f
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_alloc (abfd, rela_hdr->sh_size);
- 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;
}
return;
}
+ if (ptr->howto == NULL)
+ {
+ *failedp = TRUE;
+ return;
+ }
+
src_rela.r_offset = ptr->address + addr_offset;
src_rela.r_info = ELF_R_INFO (n, ptr->howto->type);
src_rela.r_addend = ptr->addend;
(*swap_out) (abfd, &src_rela, dst_rela);
}
+
+ if (!bed->write_secondary_relocs (abfd, sec))
+ {
+ *failedp = TRUE;
+ return;
+ }
}
/* Write out the program headers. */
while (count--)
{
Elf_External_Phdr extphdr;
+
elf_swap_phdr_out (abfd, phdr, &extphdr);
if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd)
!= sizeof (Elf_External_Phdr))
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... */
- amt = i_ehdrp->e_shnum;
- amt *= 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;
#endif
elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count);
}
+ amt = (bfd_size_type) i_ehdrp->e_shnum * sizeof (*x_shdrp);
if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0
|| bfd_bwrite (x_shdrp, amt, abfd) != amt)
return FALSE;
{
Elf_Internal_Shdr i_shdr;
Elf_External_Shdr x_shdr;
+ bfd_byte *contents, *free_contents;
i_shdr = *i_shdrp[count];
i_shdr.sh_offset = 0;
elf_swap_shdr_out (abfd, &i_shdr, &x_shdr);
(*process) (&x_shdr, sizeof x_shdr, arg);
- /* PR ld/12451:
- Process the section's contents, if it has some. Read them in if necessary. */
- if (i_shdr.contents)
- (*process) (i_shdr.contents, i_shdr.sh_size, arg);
- else if (i_shdr.sh_type != SHT_NOBITS)
+ /* Process the section's contents, if it has some.
+ PR ld/12451: Read them in if necessary. */
+ if (i_shdr.sh_type == SHT_NOBITS)
+ continue;
+ free_contents = NULL;
+ contents = i_shdr.contents;
+ if (contents == NULL)
{
asection *sec;
sec = bfd_section_from_elf_index (abfd, count);
if (sec != NULL)
{
- if (sec->contents == NULL)
+ contents = sec->contents;
+ if (contents == NULL)
{
/* Force rereading from file. */
sec->flags &= ~SEC_IN_MEMORY;
- if (! bfd_malloc_and_get_section (abfd, sec, & sec->contents))
+ if (!bfd_malloc_and_get_section (abfd, sec, &free_contents))
continue;
+ contents = free_contents;
}
- if (sec->contents != NULL)
- (*process) (sec->contents, i_shdr.sh_size, arg);
}
}
+ if (contents != NULL)
+ {
+ (*process) (contents, i_shdr.sh_size, arg);
+ free (free_contents);
+ }
}
return TRUE;
Elf_External_Versym *xver;
Elf_External_Versym *xverbuf = NULL;
const struct elf_backend_data *ebd;
- bfd_size_type amt;
+ 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
verhdr = NULL;
else
verhdr = &elf_tdata (abfd)->dynversym_hdr;
- if ((elf_tdata (abfd)->dynverdef_section != 0
+ if ((elf_dynverdef (abfd) != 0
&& elf_tdata (abfd)->verdef == NULL)
- || (elf_tdata (abfd)->dynverref_section != 0
+ || (elf_dynverref (abfd) != 0
&& elf_tdata (abfd)->verref == NULL))
{
if (!_bfd_elf_slurp_version_tables (abfd, FALSE))
if (isymbuf == NULL)
return -1;
- amt = symcount;
- amt *= 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 (verhdr != NULL
&& verhdr->sh_size / sizeof (Elf_External_Versym) != symcount)
{
- (*_bfd_error_handler)
- (_("%s: version count (%ld) does not match symbol count (%ld)"),
- abfd->filename,
- (long) (verhdr->sh_size / sizeof (Elf_External_Versym)),
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("%pB: version count (%" PRId64 ")"
+ " does not match symbol count (%ld)"),
+ abfd,
+ (int64_t) (verhdr->sh_size / sizeof (Elf_External_Versym)),
symcount);
/* Slurp in the symbols without the version information,
{
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. */
for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++)
{
memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym));
- sym->symbol.the_bfd = abfd;
+ sym->symbol.the_bfd = abfd;
sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL);
-
sym->symbol.value = isym->st_value;
if (isym->st_shndx == SHN_UNDEF)
{
/* 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;
}
}
case STT_COMMON:
/* FIXME: Do we have to put the size field into the value field
as we do with symbols in SHN_COMMON sections (see above) ? */
+ sym->symbol.flags |= BSF_ELF_COMMON;
/* Fall through. */
case STT_OBJECT:
sym->symbol.flags |= BSF_OBJECT;
*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;
i < reloc_count;
i++, relent++, native_relocs += entsize)
{
+ bfd_boolean res;
Elf_Internal_Rela rela;
if (entsize == sizeof (Elf_External_Rela))
relent->address = rela.r_offset - asect->vma;
if (ELF_R_SYM (rela.r_info) == STN_UNDEF)
+ /* FIXME: This and the error case below mean that we have a
+ symbol on relocs that is not elf_symbol_type. */
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
else if (ELF_R_SYM (rela.r_info) > symcount)
{
- (*_bfd_error_handler)
- (_("%s(%s): relocation %d has invalid symbol index %ld"),
- abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info));
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("%pB(%pA): relocation %d has invalid symbol index %ld"),
+ abfd, asect, i, (long) ELF_R_SYM (rela.r_info));
+ bfd_set_error (bfd_error_bad_value);
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
}
else
if ((entsize == sizeof (Elf_External_Rela)
&& ebd->elf_info_to_howto != NULL)
|| ebd->elf_info_to_howto_rel == NULL)
- (*ebd->elf_info_to_howto) (abfd, relent, &rela);
+ res = ebd->elf_info_to_howto (abfd, relent, &rela);
else
- (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela);
- }
+ res = ebd->elf_info_to_howto_rel (abfd, relent, &rela);
- if (allocated != NULL)
- free (allocated);
+ if (! res || relent->howto == NULL)
+ goto error_return;
+ }
+ 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;
- bfd_size_type amt;
+ size_t amt;
if (asect->relocation != NULL)
return TRUE;
rel_hdr2 = d->rela.hdr;
reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0;
- BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2);
+ /* PR 17512: file: 0b4f81b7. */
+ if (asect->reloc_count != reloc_count + reloc_count2)
+ return FALSE;
BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset)
|| (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
reloc_count2 = 0;
}
- amt = (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))
+ return FALSE;
+
asect->relocation = relents;
return TRUE;
}
#endif
\f
/* Create a new BFD as if by bfd_openr. Rather than opening a file,
- reconstruct an ELF file by reading the segments out of remote memory
- based on the ELF file header at EHDR_VMA and the ELF program headers it
- points to. If not null, *LOADBASEP is filled in with the difference
- between the VMAs from which the segments were read, and the VMAs the
- file headers (and hence BFD's idea of each section's VMA) put them at.
-
- The function TARGET_READ_MEMORY is called to copy LEN bytes from the
- remote memory at target address VMA into the local buffer at MYADDR; it
- should return zero on success or an `errno' code on failure. TEMPL must
- be a BFD for a target with the word size and byte order found in the
- remote memory. */
+ reconstruct an ELF file by reading the segments out of remote
+ memory based on the ELF file header at EHDR_VMA and the ELF program
+ headers it points to. If non-zero, SIZE is the known extent of the
+ object. If not null, *LOADBASEP is filled in with the difference
+ between the VMAs from which the segments were read, and the VMAs
+ the file headers (and hence BFD's idea of each section's VMA) put
+ them at.
+
+ The function TARGET_READ_MEMORY is called to copy LEN bytes from
+ the remote memory at target address VMA into the local buffer at
+ MYADDR; it should return zero on success or an `errno' code on
+ failure. TEMPL must be a BFD for a target with the word size and
+ byte order found in the remote memory. */
bfd *
NAME(_bfd_elf,bfd_from_remote_memory)
(bfd *templ,
- bfd_vma ehdr_vma,
- 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 */
Elf_External_Phdr *x_phdrs;
- Elf_Internal_Phdr *i_phdrs, *last_phdr;
+ Elf_Internal_Phdr *i_phdrs, *last_phdr, *first_phdr;
bfd *nbfd;
struct bfd_in_memory *bim;
- int contents_size;
bfd_byte *contents;
int err;
unsigned int i;
- bfd_vma loadbase;
- bfd_boolean loadbase_set;
+ bfd_vma high_offset;
+ bfd_vma shdr_end;
+ 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_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs));
- if (x_phdrs == NULL)
+ if (_bfd_mul_overflow (i_ehdr.e_phnum,
+ sizeof (*x_phdrs) + sizeof (*i_phdrs), &amt))
{
- bfd_set_error (bfd_error_no_memory);
+ 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,
i_ehdr.e_phnum * sizeof x_phdrs[0]);
if (err)
}
i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum];
- contents_size = 0;
+ high_offset = 0;
+ loadbase = 0;
+ first_phdr = NULL;
last_phdr = NULL;
- loadbase = ehdr_vma;
- loadbase_set = FALSE;
for (i = 0; i < i_ehdr.e_phnum; ++i)
{
elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]);
if (i_phdrs[i].p_type == PT_LOAD)
{
- bfd_vma segment_end;
- segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
- + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
- if (segment_end > (bfd_vma) contents_size)
- contents_size = segment_end;
-
- /* LOADADDR is the `Base address' from the gELF specification:
- `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the
- first PT_LOAD as PT_LOADs are ordered by P_VADDR. */
- if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0)
+ bfd_vma segment_end = i_phdrs[i].p_offset + i_phdrs[i].p_filesz;
+
+ if (segment_end > high_offset)
{
- loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align);
- loadbase_set = TRUE;
+ high_offset = segment_end;
+ last_phdr = &i_phdrs[i];
}
- last_phdr = &i_phdrs[i];
+ /* If this program header covers offset zero, where the file
+ header sits, then we can figure out the loadbase. */
+ if (first_phdr == NULL)
+ {
+ 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 * opb);
+ p_vaddr &= -(i_phdrs[i].p_align * opb);
+ }
+ if (p_offset == 0)
+ {
+ loadbase = ehdr_vma - p_vaddr / opb;
+ first_phdr = &i_phdrs[i];
+ }
+ }
}
}
- if (last_phdr == NULL)
+ if (high_offset == 0)
{
/* There were no PT_LOAD segments, so we don't have anything to read. */
free (x_phdrs);
return NULL;
}
- /* Trim the last segment so we don't bother with zeros in the last page
- that are off the end of the file. However, if the extra bit in that
- page includes the section headers, keep them. */
- if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz
- && (bfd_vma) contents_size >= (i_ehdr.e_shoff
- + i_ehdr.e_shnum * i_ehdr.e_shentsize))
+ shdr_end = 0;
+ if (i_ehdr.e_shoff != 0 && i_ehdr.e_shnum != 0 && i_ehdr.e_shentsize != 0)
{
- contents_size = last_phdr->p_offset + last_phdr->p_filesz;
- if ((bfd_vma) contents_size < (i_ehdr.e_shoff
- + i_ehdr.e_shnum * i_ehdr.e_shentsize))
- contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize;
+ shdr_end = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize;
+
+ if (last_phdr->p_filesz != last_phdr->p_memsz)
+ {
+ /* If the last PT_LOAD header has a bss area then ld.so will
+ have cleared anything past p_filesz, zapping the section
+ headers. */
+ }
+ else if (size >= shdr_end)
+ high_offset = size;
+ else
+ {
+ bfd_vma page_size = get_elf_backend_data (templ)->minpagesize;
+ bfd_vma segment_end = last_phdr->p_offset + last_phdr->p_filesz;
+
+ /* Assume we loaded full pages, allowing us to sometimes see
+ section headers. */
+ if (page_size > 1 && shdr_end > segment_end)
+ {
+ bfd_vma page_end = (segment_end + page_size - 1) & -page_size;
+
+ if (page_end >= shdr_end)
+ /* Whee, section headers covered. */
+ high_offset = shdr_end;
+ }
+ }
}
- else
- contents_size = last_phdr->p_offset + last_phdr->p_filesz;
/* Now we know the size of the whole image we want read in. */
- contents = (bfd_byte *) bfd_zmalloc (contents_size);
+ contents = (bfd_byte *) bfd_zmalloc (high_offset);
if (contents == NULL)
{
free (x_phdrs);
- bfd_set_error (bfd_error_no_memory);
return NULL;
}
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 & -i_phdrs[i].p_align;
- bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz
- + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align;
- if (end > (bfd_vma) contents_size)
- end = contents_size;
- err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr)
- & -i_phdrs[i].p_align,
+ 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
+ aligned offset is 0. */
+ if (first_phdr == &i_phdrs[i])
+ {
+ vaddr -= start;
+ start = 0;
+ }
+ /* 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 / opb,
contents + start, end - start);
if (err)
{
/* If the segments visible in memory didn't include the section headers,
then clear them from the file header. */
- if ((bfd_vma) contents_size < (i_ehdr.e_shoff
- + i_ehdr.e_shnum * i_ehdr.e_shentsize))
+ if (high_offset < shdr_end)
{
memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff);
memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum);
if (bim == NULL)
{
free (contents);
- bfd_set_error (bfd_error_no_memory);
return NULL;
}
nbfd = _bfd_new_bfd ();
- if (nbfd == NULL)
+ if (nbfd == NULL
+ || !bfd_set_filename (nbfd, "<in-memory>"))
{
free (bim);
free (contents);
- bfd_set_error (bfd_error_no_memory);
return NULL;
}
- nbfd->filename = "<in-memory>";
nbfd->xvec = templ->xvec;
- bim->size = contents_size;
+ bim->size = high_offset;
bim->buffer = contents;
nbfd->iostream = bim;
nbfd->flags = BFD_IN_MEMORY;
projects / deliverable / binutils-gdb.git / blobdiff