allow O_TMPFILE to work with O_WRONLY

Change-Id: I90171d1b53a4c35bfa76757ecfdfb6f95330d107 Signed-off-by: Al Viro <[email protected]>
franciscofranco · Feb 23, 2019 · a0ca0f1 · a0ca0f1
1 parent 41fe920
commit a0ca0f1
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/fs/open.c b/fs/open.c
@@ -843,6 +843,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
 		if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
 			return -EINVAL;
 		acc_mode = MAY_OPEN | ACC_MODE(flags);
+		if (!(acc_mode & MAY_WRITE))
+			return -EINVAL;
 	} else if (flags & O_PATH) {
 		/*
 		 * If we have O_PATH in the open flag. Then we

diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
@@ -89,8 +89,8 @@
 #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)      
+#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
+#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT)      
 
 #ifndef O_NDELAY
 #define O_NDELAY	O_NONBLOCK