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PR 21414, null pointer deref of _bfd_elf_large_com_section sym 

PR 21414
	* section.c (GLOBAL_SYM_INIT): Make available in bfd.h.
	* elf.c (lcomm_sym): New.
	(_bfd_elf_large_com_section): Use lcomm_sym section symbol.
	* bfd-in2.h: Regenerate.
This commit is contained in:
Alan Modra 2017-04-23 15:21:11 +09:30
parent bce964aa6c
commit 7eacd66b08
4 changed files with 36 additions and 14 deletions
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8
bfd/ChangeLog
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@ -1,3 +1,11 @@
2017-04-23 Alan Modra <amodra@gmail.com>
PR 21414
* section.c (GLOBAL_SYM_INIT): Make available in bfd.h.
* elf.c (lcomm_sym): New.
(_bfd_elf_large_com_section): Use lcomm_sym section symbol.
* bfd-in2.h: Regenerate.
2017-04-23 Alan Modra <amodra@gmail.com>
PR 21412

12
bfd/bfd-in2.h
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@ -1839,6 +1839,18 @@ extern asection _bfd_std_section[4];
{ NULL }, { NULL } \
}
/* We use a macro to initialize the static asymbol structures because
traditional C does not permit us to initialize a union member while
gcc warns if we don't initialize it.
the_bfd, name, value, attr, section [, udata] */
#ifdef __STDC__
#define GLOBAL_SYM_INIT(NAME, SECTION) \
{ 0, NAME, 0, BSF_SECTION_SYM, SECTION, { 0 }}
#else
#define GLOBAL_SYM_INIT(NAME, SECTION) \
{ 0, NAME, 0, BSF_SECTION_SYM, SECTION }
#endif
void bfd_section_list_clear (bfd *);
asection *bfd_get_section_by_name (bfd *abfd, const char *name);

6
bfd/elf.c
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@ -11244,9 +11244,11 @@ _bfd_elf_get_synthetic_symtab (bfd *abfd,
/* It is only used by x86-64 so far.
??? This repeats *COM* id of zero. sec->id is supposed to be unique,
but current usage would allow all of _bfd_std_section to be zero. t*/
but current usage would allow all of _bfd_std_section to be zero. */
static const asymbol lcomm_sym
= GLOBAL_SYM_INIT ("LARGE_COMMON", &_bfd_elf_large_com_section);
asection _bfd_elf_large_com_section
= BFD_FAKE_SECTION (_bfd_elf_large_com_section, NULL,
= BFD_FAKE_SECTION (_bfd_elf_large_com_section, &lcomm_sym,
"LARGE_COMMON", 0, SEC_IS_COMMON);
void

24
bfd/section.c
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@ -738,20 +738,20 @@ CODE_FRAGMENT
. { NULL }, { NULL } \
. }
.
.{* We use a macro to initialize the static asymbol structures because
. traditional C does not permit us to initialize a union member while
. gcc warns if we don't initialize it.
. the_bfd, name, value, attr, section [, udata] *}
.#ifdef __STDC__
.#define GLOBAL_SYM_INIT(NAME, SECTION) \
. { 0, NAME, 0, BSF_SECTION_SYM, SECTION, { 0 }}
.#else
.#define GLOBAL_SYM_INIT(NAME, SECTION) \
. { 0, NAME, 0, BSF_SECTION_SYM, SECTION }
.#endif
.
*/
/* We use a macro to initialize the static asymbol structures because
traditional C does not permit us to initialize a union member while
gcc warns if we don't initialize it. */
/* the_bfd, name, value, attr, section [, udata] */
#ifdef __STDC__
#define GLOBAL_SYM_INIT(NAME, SECTION) \
{ 0, NAME, 0, BSF_SECTION_SYM, SECTION, { 0 }}
#else
#define GLOBAL_SYM_INIT(NAME, SECTION) \
{ 0, NAME, 0, BSF_SECTION_SYM, SECTION }
#endif
/* These symbols are global, not specific to any BFD. Therefore, anything
that tries to change them is broken, and should be repaired. */