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120 lines
4.2 KiB

2007-09-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* elfcode.h (NAME(_bfd_elf,bfd_from_remote_memory)): New variables
X_SHDR_SHSTRTAB and I_SHDR_SHSTRTAB. Fixed the CONTENTS_SIZE trimming
check for its aligned size between the last segment and still before
the section header end. Added variables check to cover also the
section header string table.
--- gdb-7.4.50.20120120-orig/bfd/elfcode.h 2012-02-29 09:17:08.000000000 +0100
+++ gdb-7.4.50.20120120/bfd/elfcode.h 2012-02-29 10:23:03.000000000 +0100
@@ -1621,6 +1621,8 @@ NAME(_bfd_elf,bfd_from_remote_memory)
Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */
Elf_External_Phdr *x_phdrs;
Elf_Internal_Phdr *i_phdrs, *last_phdr;
+ Elf_External_Shdr *x_shdrs;
+ Elf_Internal_Shdr *i_shdrs;
bfd *nbfd;
struct bfd_in_memory *bim;
int contents_size;
@@ -1740,24 +1742,46 @@ NAME(_bfd_elf,bfd_from_remote_memory)
/* 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))
+ page includes the section headers os the section header string table,
+ keep them. */
+ if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz)
+ 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;
+
+ /* Verify also all the sections fit into CONTENTS_SIZE. */
+
+ x_shdrs = bfd_malloc (i_ehdr.e_shnum * (sizeof *x_shdrs + sizeof *i_shdrs));
+ if (x_shdrs == NULL)
{
- 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;
+ free (x_phdrs);
+ bfd_set_error (bfd_error_no_memory);
+ return NULL;
}
+ err = target_read_memory (ehdr_vma + i_ehdr.e_shoff, (bfd_byte *) x_shdrs,
+ i_ehdr.e_shnum * sizeof *x_shdrs);
+ if (err)
+ i_shdrs = NULL;
else
- contents_size = last_phdr->p_offset + last_phdr->p_filesz;
+ {
+ i_shdrs = (Elf_Internal_Shdr *) &x_shdrs[i_ehdr.e_shnum];
+ for (i = 0; i < i_ehdr.e_shnum; ++i)
+ {
+ elf_swap_shdr_in (templ, &x_shdrs[i], &i_shdrs[i]);
+
+ if ((bfd_vma) contents_size < i_shdrs[i].sh_offset + i_shdrs[i].sh_size)
+ contents_size = i_shdrs[i].sh_offset + i_shdrs[i].sh_size;
+ }
+ }
/* Now we know the size of the whole image we want read in. */
contents = (bfd_byte *) bfd_zmalloc (contents_size);
if (contents == NULL)
{
free (x_phdrs);
+ free (x_shdrs);
bfd_set_error (bfd_error_no_memory);
return NULL;
}
@@ -1776,6 +1800,7 @@ NAME(_bfd_elf,bfd_from_remote_memory)
if (err)
{
free (x_phdrs);
+ free (x_shdrs);
free (contents);
bfd_set_error (bfd_error_system_call);
errno = err;
@@ -1784,10 +1809,32 @@ NAME(_bfd_elf,bfd_from_remote_memory)
}
free (x_phdrs);
- /* If the segments visible in memory didn't include the section headers,
+ if (i_shdrs)
+ {
+ memcpy (contents + i_ehdr.e_shoff, x_shdrs,
+ i_ehdr.e_shnum * sizeof *x_shdrs);
+
+ for (i = 0; i < i_ehdr.e_shnum; ++i)
+ {
+ bfd_vma start = i_shdrs[i].sh_offset;
+ bfd_vma end = i_shdrs[i].sh_offset + i_shdrs[i].sh_size;
+
+ if (end > (bfd_vma) contents_size)
+ end = contents_size;
+ err = target_read_memory (ehdr_vma + start, contents + start,
+ end - start);
+ if (err)
+ {
+ i_shdrs = NULL;
+ break;
+ }
+ }
+ }
+ free (x_shdrs);
+
+ /* If the segments readable 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 (i_shdrs == NULL)
{
memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff);
memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum);