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| author | Eric Rannaud <e@nanocritical.com> | 2015-02-24 13:12:26 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2015-02-24 13:19:22 +0530 |
| commit | 65f6f938cd562a614a68e15d0581a34b177ec29d (patch) | |
| tree | c33b9da9e6b00195e90e87b811a3d7def6529425 /io/open_2.c | |
| parent | 3e3002ffead0526d088c353f97475400367087da (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 'io/open_2.c')
| -rw-r--r-- | io/open_2.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/io/open_2.c b/io/open_2.c index c07ecdd3bd..f11ebe00bb 100644 --- a/io/open_2.c +++ b/io/open_2.c @@ -22,8 +22,8 @@ int __open_2 (const char *file, int oflag) { - if (oflag & O_CREAT) - __fortify_fail ("invalid open call: O_CREAT without mode"); + if (__OPEN_NEEDS_MODE (oflag)) + __fortify_fail ("invalid open call: O_CREAT or O_TMPFILE without mode"); return __open (file, oflag); } |