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libio: Remove the usage of __libc_IO_vtables

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Instead of using a special ELF section along with a linker script
directive to put the IO vtables within the RELRO section, the libio
vtables are all moved to an array marked as data.relro (so linker
will place in the RELRO segment without the need of extra directives).

To avoid static linking namespace issues and including all vtable
referenced objects, all required function pointers are set to weak alias.

Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto
2022-12-27 18:11:43 -03:00
committed by Adhemerval Zanella
parent f65ca70dea
commit 3020f72618
22 changed files with 637 additions and 513 deletions
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28
stdio-common/printf_buffer_as_file.c
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@ -48,7 +48,7 @@ __printf_buffer_as_file_switch_to_buffer (struct __printf_buffer_as_file *file)
/* Only a small subset of the vtable functions is implemented here,
following _IO_obstack_jumps. */
static int
int
__printf_buffer_as_file_overflow (FILE *fp, int ch)
{
struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
@ -72,7 +72,7 @@ __printf_buffer_as_file_overflow (FILE *fp, int ch)
return EOF;
}
static size_t
size_t
__printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
{
struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
@ -93,30 +93,6 @@ __printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
return 0;
}
static const struct _IO_jump_t _IO_printf_buffer_as_file_jumps libio_vtable =
{
JUMP_INIT_DUMMY,
JUMP_INIT(finish, NULL),
JUMP_INIT(overflow, __printf_buffer_as_file_overflow),
JUMP_INIT(underflow, NULL),
JUMP_INIT(uflow, NULL),
JUMP_INIT(pbackfail, NULL),
JUMP_INIT(xsputn, __printf_buffer_as_file_xsputn),
JUMP_INIT(xsgetn, NULL),
JUMP_INIT(seekoff, NULL),
JUMP_INIT(seekpos, NULL),
JUMP_INIT(setbuf, NULL),
JUMP_INIT(sync, NULL),
JUMP_INIT(doallocate, NULL),
JUMP_INIT(read, NULL),
JUMP_INIT(write, NULL),
JUMP_INIT(seek, NULL),
JUMP_INIT(close, NULL),
JUMP_INIT(stat, NULL),
JUMP_INIT(showmanyc, NULL),
JUMP_INIT(imbue, NULL)
};
void
__printf_buffer_as_file_init (struct __printf_buffer_as_file *file,
struct __printf_buffer *next)