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Prevent illegal memory accesses when parsing incorrecctly formated core notes. 

PR 22421
	* elf.c (elfcore_grok_netbsd_procinfo): Check that the note is big enough.
	(elfcore_grok_openbsd_procinfo): Likewise.
	(elfcore_grok_nto_status): Likewise.
This commit is contained in:
Nick Clifton 2017-11-16 14:53:32 +00:00
parent d8ae99a7b0
commit 80a0437873
2 changed files with 17 additions and 0 deletions
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7
bfd/ChangeLog
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@ -1,3 +1,10 @@
2017-11-16 Nick Clifton <nickc@redhat.com>
PR 22421
* elf.c (elfcore_grok_netbsd_procinfo): Check that the note is big enough.
(elfcore_grok_openbsd_procinfo): Likewise.
(elfcore_grok_nto_status): Likewise.
2017-11-16 Nick Clifton <nickc@redhat.com>
* merge.c (sec_merge_emit): Always create padding buffer. Add

10
bfd/elf.c
View File

@ -9871,6 +9871,7 @@ elfcore_grok_freebsd_psinfo (bfd *abfd, Elf_Internal_Note *note)
/* Check for version 1 in pr_version. */
if (bfd_h_get_32 (abfd, (bfd_byte *) note->descdata) != 1)
return FALSE;
offset = 4;
/* Skip over pr_psinfosz. */
@ -10051,6 +10052,9 @@ elfcore_netbsd_get_lwpid (Elf_Internal_Note *note, int *lwpidp)
static bfd_boolean
elfcore_grok_netbsd_procinfo (bfd *abfd, Elf_Internal_Note *note)
{
if (note->descsz <= 0x7c + 31)
return FALSE;
/* Signal number at offset 0x08. */
elf_tdata (abfd)->core->signal
= bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + 0x08);
@ -10135,6 +10139,9 @@ elfcore_grok_netbsd_note (bfd *abfd, Elf_Internal_Note *note)
static bfd_boolean
elfcore_grok_openbsd_procinfo (bfd *abfd, Elf_Internal_Note *note)
{
if (note->descsz <= 0x48 + 31)
return FALSE;
/* Signal number at offset 0x08. */
elf_tdata (abfd)->core->signal
= bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + 0x08);
@ -10206,6 +10213,9 @@ elfcore_grok_nto_status (bfd *abfd, Elf_Internal_Note *note, long *tid)
short sig;
unsigned flags;
if (note->descsz < 16)
return FALSE;
/* nto_procfs_status 'pid' field is at offset 0. */
elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, (bfd_byte *) ddata);