[PATCH] binfmt_flat mmap flag fix

Make sure that binfmt_flat passes the correct flags into do_mmap().  nommu's
validate_mmap_request() will simple return -EINVAL if we try and pass it a
flags value of zero.
Signed-off-by: NYoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/binfmt_flat.c

@@ -520,7 +520,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 		DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
 
 		down_write(&current->mm->mmap_sem);
-		textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, 0, 0);
+		textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, MAP_SHARED, 0);
 		up_write(&current->mm->mmap_sem);
 		if (!textpos  || textpos >= (unsigned long) -4096) {
 			if (!textpos)
@@ -532,7 +532,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 		down_write(&current->mm->mmap_sem);
 		realdatastart = do_mmap(0, 0, data_len + extra +
 				MAX_SHARED_LIBS * sizeof(unsigned long),
-				PROT_READ|PROT_WRITE|PROT_EXEC, 0, 0);
+				PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
 		up_write(&current->mm->mmap_sem);
 
 		if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
@@ -574,7 +574,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 		down_write(&current->mm->mmap_sem);
 		textpos = do_mmap(0, 0, text_len + data_len + extra +
 					MAX_SHARED_LIBS * sizeof(unsigned long),
-				PROT_READ | PROT_EXEC | PROT_WRITE, 0, 0);
+				PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
 		up_write(&current->mm->mmap_sem);
 		if (!textpos  || textpos >= (unsigned long) -4096) {
 			if (!textpos)