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linux: open and openat ignore 'mode' with O_TMPFILE in flags

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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.
This commit is contained in:
Eric Rannaud
2015-02-24 13:12:26 +05:30
committed by Siddhesh Poyarekar
parent 3e3002ffea
commit 65f6f938cd
20 changed files with 81 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
io/bits/fcntl2.h
View File

@ -20,7 +20,7 @@
# error "Never include <bits/fcntl2.h> directly; use <fcntl.h> instead."
#endif
/* Check that calls to open and openat with O_CREAT set have an
/* Check that calls to open and openat with O_CREAT or O_TMPFILE set have an
appropriate third/fourth parameter. */
#ifndef __USE_FILE_OFFSET64
extern int __open_2 (const char *__path, int __oflag) __nonnull ((1));
@ -35,7 +35,7 @@ extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
__errordecl (__open_too_many_args,
"open can be called either with 2 or 3 arguments, not more");
__errordecl (__open_missing_mode,
"open with O_CREAT in second argument needs 3 arguments");
"open with O_CREAT or O_TMPFILE in second argument needs 3 arguments");
__fortify_function int
open (const char *__path, int __oflag, ...)
@ -45,7 +45,7 @@ open (const char *__path, int __oflag, ...)
if (__builtin_constant_p (__oflag))
{
if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
{
__open_missing_mode ();
return __open_2 (__path, __oflag);
@ -67,7 +67,7 @@ extern int __REDIRECT (__open64_alias, (const char *__path, int __oflag,
__errordecl (__open64_too_many_args,
"open64 can be called either with 2 or 3 arguments, not more");
__errordecl (__open64_missing_mode,
"open64 with O_CREAT in second argument needs 3 arguments");
"open64 with O_CREAT or O_TMPFILE in second argument needs 3 arguments");
__fortify_function int
open64 (const char *__path, int __oflag, ...)
@ -77,7 +77,7 @@ open64 (const char *__path, int __oflag, ...)
if (__builtin_constant_p (__oflag))
{
if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
{
__open64_missing_mode ();
return __open64_2 (__path, __oflag);
@ -111,7 +111,7 @@ extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
__errordecl (__openat_too_many_args,
"openat can be called either with 3 or 4 arguments, not more");
__errordecl (__openat_missing_mode,
"openat with O_CREAT in third argument needs 4 arguments");
"openat with O_CREAT or O_TMPFILE in third argument needs 4 arguments");
__fortify_function int
openat (int __fd, const char *__path, int __oflag, ...)
@ -121,7 +121,7 @@ openat (int __fd, const char *__path, int __oflag, ...)
if (__builtin_constant_p (__oflag))
{
if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
{
__openat_missing_mode ();
return __openat_2 (__fd, __path, __oflag);
@ -145,7 +145,7 @@ extern int __REDIRECT (__openat64_alias, (int __fd, const char *__path,
__errordecl (__openat64_too_many_args,
"openat64 can be called either with 3 or 4 arguments, not more");
__errordecl (__openat64_missing_mode,
"openat64 with O_CREAT in third argument needs 4 arguments");
"openat64 with O_CREAT or O_TMPFILE in third argument needs 4 arguments");
__fortify_function int
openat64 (int __fd, const char *__path, int __oflag, ...)
@ -155,7 +155,7 @@ openat64 (int __fd, const char *__path, int __oflag, ...)
if (__builtin_constant_p (__oflag))
{
if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () < 1)
if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
{
__openat64_missing_mode ();
return __openat64_2 (__fd, __path, __oflag);