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This commit puts all libio vtables in a dedicated, read-only ELF
section, so that they are consecutive in memory. Before any indirect
jump, the vtable pointer is checked against the section boundaries,
and the process is terminated if the vtable pointer does not fall into
the special ELF section.
To enable backwards compatibility, a special flag variable
(_IO_accept_foreign_vtables), protected by the pointer guard, avoids
process termination if libio stream object constructor functions have
been called earlier. Such constructor functions are called by the GCC
2.95 libstdc++ library, and this mechanism ensures compatibility with
old binaries. Existing callers inside glibc of these functions are
adjusted to call the original functions, not the wrappers which enable
vtable compatiblity.
The compatibility mechanism is used to enable passing FILE * objects
across a static dlopen boundary, too.
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__obstack_printf_chk): New prototypes.
(__vasprintf_chk, __vdprintf_chk,
__obstack_vprintf_chk): Likewise.
Add libc_hidden_proto.
* libio/obprintf.c
(_IO_obstack_jumps): No longer static, add attribute_hidden.
* libio/bits/stdio-ldbl.h (__asprintf_chk, __dprintf_chk,
__obstack_printf_chk, __vasprintf_chk, __vdprintf_chk,
__obstack_vprintf_chk): Add __LDBL_REDIR_DECL.
* libio/bits/stdio2.h (__asprintf_chk, __dprintf_chk,
__obstack_printf_chk, __vasprintf_chk, __vdprintf_chk,
__obstack_vprintf_chk): New prototypes.
(asprintf, __asprintf, dprintf, obstack_printf, vasprintf, vdprintf,
obstack_vprintf): New inlines.
* debug/dprintf_chk.c: New file.
* debug/vdprintf_chk.c: New file.
* debug/asprintf_chk.c: New file.
* debug/vasprintf_chk.c: New file.
* debug/obprintf_chk.c: New file.
* debug/tst-chk1.c (do_test): Add asprintf and obstack_printf tests.
* debug/Versions (__asprintf_chk, __dprintf_chk, __obstack_printf_chk,
__vasprintf_chk, __vdprintf_chk, __obstack_vprintf_chk): Export
@@GLIBC_2.8.
* debug/Makefile: Build asprintf_chk, vasprintf_chk, dprintf_chk,
vdprintf_chk and obprintf_chk, set CFLAGS for them.
* sysdeps/ieee754/ldbl-opt/nldbl-compat.c (__nldbl___vasprintf_chk,
__nldbl___vdprintf_chk, __nldbl___obstack_vprintf_chk): Add
libc_hidden_proto.
* sysdeps/ieee754/ldbl-opt/nldbl-compat.h (__nldbl___vasprintf_chk,
__nldbl___vdprintf_chk, __nldbl___obstack_vprintf_chk): New prototypes.
* sysdeps/ieee754/ldbl-opt/Versions (__nldbl___asprintf_chk,
__nldbl___vasprintf_chk, __nldbl___dprintf_chk, __nldbl___vdprintf_chk,
__nldbl___obstack_printf_chk, __nldbl___obstack_vprintf_chk): Export
@@GLIBC_2.8.
* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add asprintf_chk,
vasprintf_chk, dprintf_chk, vdprintf_chk, obstack_printf_chk and
obstack_vprintf_chk.
* sysdeps/ieee754/ldbl-opt/nldbl-obstack_vprintf_chk.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-dprintf_chk.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-obstack_printf_chk.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-asprintf_chk.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-vdprintf_chk.c: New file.
* sysdeps/ieee754/ldbl-opt/nldbl-vasprintf_chk.c: New file.
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