code: plan9front

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ext4srv: disallow fwrite/ftruncate on files not open for writing

--- a/sys/src/cmd/ext4srv/ext4.c

+++ b/sys/src/cmd/ext4srv/ext4.c

@@ -1566,7 +1566,7 @@

 		return -1;

 	}

-	if (f->flags & O_RDONLY) {

+	if ((f->flags & O_WRMASK) == 0) {

 		werrstr(Eperm);

 		return -1;

 	}

@@ -1770,7 +1770,7 @@

 		return -1;

 	}

-	if (file->flags & O_RDONLY) {

+	if ((file->flags & O_WRMASK) == 0) {

 		werrstr(Eperm);

 		return -1;

 	}

--- a/sys/src/cmd/ext4srv/include/ext4_config.h

+++ b/sys/src/cmd/ext4srv/include/ext4_config.h

@@ -13,6 +13,8 @@

 	O_EXCL = 0200,

 	O_TRUNC = 01000,

 	O_APPEND = 02000,

+

+	O_WRMASK = O_WRONLY | O_RDWR,

 };

 #if defined(__mips__) || defined(__power__) || defined(__power64__) || defined(__sparc__) || defined(__sparc64__)