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authorEric Rannaud <e@nanocritical.com>2015-02-24 13:12:26 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2015-02-24 13:19:22 +0530
commit65f6f938cd562a614a68e15d0581a34b177ec29d (patch)
treec33b9da9e6b00195e90e87b811a3d7def6529425 /sysdeps/mach
parent3e3002ffead0526d088c353f97475400367087da (diff)
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linux: open and openat ignore 'mode' with O_TMPFILE in flags
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.
Diffstat (limited to 'sysdeps/mach')
-rw-r--r--sysdeps/mach/hurd/open.c4
-rw-r--r--sysdeps/mach/hurd/openat.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/sysdeps/mach/hurd/open.c b/sysdeps/mach/hurd/open.c
index 2d1415a..c497a7c 100644
--- a/sysdeps/mach/hurd/open.c
+++ b/sysdeps/mach/hurd/open.c
@@ -22,7 +22,7 @@
#include <hurd.h>
#include <hurd/fd.h>
-/* Open FILE with access OFLAG. If OFLAG includes O_CREAT,
+/* Open FILE with access OFLAG. If O_CREAT or O_TMPFILE is in OFLAG,
a third argument is the file protection. */
int
__libc_open (const char *file, int oflag, ...)
@@ -30,7 +30,7 @@ __libc_open (const char *file, int oflag, ...)
mode_t mode;
io_t port;
- if (oflag & O_CREAT)
+ if (__OPEN_NEEDS_MODE (oflag))
{
va_list arg;
va_start (arg, oflag);
diff --git a/sysdeps/mach/hurd/openat.c b/sysdeps/mach/hurd/openat.c
index 0928dff..0d3e138 100644
--- a/sysdeps/mach/hurd/openat.c
+++ b/sysdeps/mach/hurd/openat.c
@@ -26,7 +26,7 @@
#include <hurd/fd.h>
/* Open FILE with access OFLAG. Interpret relative paths relative to
- the directory associated with FD. If OFLAG includes O_CREAT, a
+ the directory associated with FD. If O_CREAT or O_TMPFILE is in OFLAG, a
third argument is the file protection. */
int
__openat (fd, file, oflag)
@@ -37,7 +37,7 @@ __openat (fd, file, oflag)
mode_t mode;
io_t port;
- if (oflag & O_CREAT)
+ if (__OPEN_NEEDS_MODE (oflag))
{
va_list arg;
va_start (arg, oflag);