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Both open and openat load their last argument 'mode' lazily, using
va_arg() only if O_CREAT is found in oflag. This is wrong, mode is also
necessary if O_TMPFILE is in oflag.
By chance on x86_64, the problem wasn't evident when using O_TMPFILE
with open, as the 3rd argument of open, even when not loaded with
va_arg, is left untouched in RDX, where the syscall expects it.
However, openat was not so lucky, and O_TMPFILE couldn't be used: mode
is the 4th argument, in RCX, but the syscall expects its 4th argument in
a different register than the glibc wrapper, in R10.
Introduce a macro __OPEN_NEEDS_MODE (oflag) to test if either O_CREAT or
O_TMPFILE is set in oflag.
Tested on Linux x86_64.
[BZ #17523]
* io/fcntl.h (__OPEN_NEEDS_MODE): New macro.
* io/bits/fcntl2.h (open): Use it.
(openat): Likewise.
* io/open.c (__libc_open): Likewise.
* io/open64.c (__libc_open64): Likewise.
* io/open64_2.c (__open64_2): Likewise.
* io/open_2.c (__open_2): Likewise.
* io/openat.c (__openat): Likewise.
* io/openat64.c (__openat64): Likewise.
* io/openat64_2.c (__openat64_2): Likewise.
* io/openat_2.c (__openat_2): Likewise.
* sysdeps/mach/hurd/open.c (__libc_open): Likewise.
* sysdeps/mach/hurd/openat.c (__openat): Likewise.
* sysdeps/posix/open64.c (__libc_open64): Likewise.
* sysdeps/unix/sysv/linux/dl-openat64.c (openat64): Likewise.
* sysdeps/unix/sysv/linux/generic/open.c (__libc_open): Likewise.
(__open_nocancel): Likewise.
* sysdeps/unix/sysv/linux/generic/open64.c (__libc_open64): Likewise.
* sysdeps/unix/sysv/linux/open64.c (__libc_open64): Likewise.
* sysdeps/unix/sysv/linux/openat.c (__OPENAT): Likewise.
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* Versions: Define GLIBC_2.7 for libc.
* include/stdio.h: Declare __fortify_fail.
* debug/fortify_fail.c: New file.
* debug/Makefile (routines): Add fortify_fail.
* debug/chk_fail.c: Use __fortify_fail.
* debug/stack_chk_fail.c: Likewise.
* io/Versions: Export __open_2, __open64_2, __openat_2, and
__openat64_2 for GLIBC_2.7.
* io/fcntl.h: When compiling with fortification, include bits/fcntl2.h.
* io/open.c: Define *_2 variant of function which checks for O_CREAT
and fails if necessary.
* io/open64.c: Likewise.
* io/openat.c: Likewise.
* io/openat64.c: Likewise.
* sysdeps/unix/sysv/linux/open64.c: Likewise.
* sysdeps/unix/sysv/linux/openat.c: Likewise.
* sysdeps/unix/sysv/linux/openat64.c: Likewise.
* io/bits/fcntl2.h: New file.
* include/fcntl.h: Declare __open_2, __open64_2, __openat_2, and
__openat64_2.
* include/bits/fcntl2.h: New file.
* sysdeps/unix/sysv/linux/Makefile [subdir=io] (sysdep_routines):
Add open_2.
* sysdeps/unix/sysv/linux/open_2.c: New file.
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