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authorAl Viro <viro@zeniv.linux.org.uk>2013-07-13 13:26:37 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-07-13 13:26:37 +0400
commitbb458c644a59dbba3a1fe59b27106c5e68e1c4bd (patch)
treeb0f3b51fc5cbd044b076cb0a1fec43ca62f2b7f5
parent4fbeb19d53cc3ef2da4bd1fd89a5dc9ac04add3a (diff)
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Safer ABI for O_TMPFILE
[suggested by Rasmus Villemoes] make O_DIRECTORY | O_RDWR part of O_TMPFILE; that will fail on old kernels in a lot more cases than what I came up with. And make sure O_CREAT doesn't get there... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--arch/alpha/include/uapi/asm/fcntl.h2
-rw-r--r--arch/parisc/include/uapi/asm/fcntl.h2
-rw-r--r--arch/sparc/include/uapi/asm/fcntl.h2
-rw-r--r--fs/namei.c2
-rw-r--r--fs/open.c4
-rw-r--r--include/uapi/asm-generic/fcntl.h8
6 files changed, 12 insertions, 8 deletions
diff --git a/arch/alpha/include/uapi/asm/fcntl.h b/arch/alpha/include/uapi/asm/fcntl.h
index dfdadb0..09f49a6 100644
--- a/arch/alpha/include/uapi/asm/fcntl.h
+++ b/arch/alpha/include/uapi/asm/fcntl.h
@@ -32,7 +32,7 @@
#define O_SYNC (__O_SYNC|O_DSYNC)
#define O_PATH 040000000
-#define O_TMPFILE 0100000000
+#define __O_TMPFILE 0100000000
#define F_GETLK 7
#define F_SETLK 8
diff --git a/arch/parisc/include/uapi/asm/fcntl.h b/arch/parisc/include/uapi/asm/fcntl.h
index cc61c47..34a46cb 100644
--- a/arch/parisc/include/uapi/asm/fcntl.h
+++ b/arch/parisc/include/uapi/asm/fcntl.h
@@ -20,7 +20,7 @@
#define O_INVISIBLE 004000000 /* invisible I/O, for DMAPI/XDSM */
#define O_PATH 020000000
-#define O_TMPFILE 040000000
+#define __O_TMPFILE 040000000
#define F_GETLK64 8
#define F_SETLK64 9
diff --git a/arch/sparc/include/uapi/asm/fcntl.h b/arch/sparc/include/uapi/asm/fcntl.h
index d73e5e0..7e8ace5 100644
--- a/arch/sparc/include/uapi/asm/fcntl.h
+++ b/arch/sparc/include/uapi/asm/fcntl.h
@@ -35,7 +35,7 @@
#define O_SYNC (__O_SYNC|O_DSYNC)
#define O_PATH 0x1000000
-#define O_TMPFILE 0x2000000
+#define __O_TMPFILE 0x2000000
#define F_GETOWN 5 /* for sockets. */
#define F_SETOWN 6 /* for sockets. */
diff --git a/fs/namei.c b/fs/namei.c
index b2beee7..8b61d10 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2977,7 +2977,7 @@ static struct file *path_openat(int dfd, struct filename *pathname,
file->f_flags = op->open_flag;
- if (unlikely(file->f_flags & O_TMPFILE)) {
+ if (unlikely(file->f_flags & __O_TMPFILE)) {
error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
goto out;
}
diff --git a/fs/open.c b/fs/open.c
index fca72c4..9156cb0 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -840,8 +840,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
if (flags & __O_SYNC)
flags |= O_DSYNC;
- if (flags & O_TMPFILE) {
- if (!(flags & O_CREAT))
+ if (flags & __O_TMPFILE) {
+ if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
return -EINVAL;
acc_mode = MAY_OPEN | ACC_MODE(flags);
} else if (flags & O_PATH) {
diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
index 06632be..05ac354 100644
--- a/include/uapi/asm-generic/fcntl.h
+++ b/include/uapi/asm-generic/fcntl.h
@@ -84,10 +84,14 @@
#define O_PATH 010000000
#endif
-#ifndef O_TMPFILE
-#define O_TMPFILE 020000000
+#ifndef __O_TMPFILE
+#define __O_TMPFILE 020000000
#endif
+/* a horrid kludge trying to make sure that this will fail on old kernels */
+#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY | O_RDWR)
+#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT | O_ACCMODE)
+
#ifndef O_NDELAY
#define O_NDELAY O_NONBLOCK
#endif