[1/3] fs/exec: don't force writing memory access

Commit Message

Jann Horn Nov. 3, 2016, 3:04 a.m. UTC

This shouldn't change behavior in any way - at this point, there should be
no non-writable mappings, only the initial stack mapping -, but this change
makes it easier to reason about the correctness of the following commits
that place restrictions on forced memory writes.

Signed-off-by: Jann Horn <[e-mail]>
Reviewed-by: Janis Danisevskis <[e-mail]>
---
 fs/exec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/fs/exec.c b/fs/exec.c
index 4e497b9ee71e..dbc2dd2f0829 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -191,7 +191,7 @@  static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
 {
 	struct page *page;
 	int ret;
-	unsigned int gup_flags = FOLL_FORCE;
+	unsigned int gup_flags = 0;
 
 #ifdef CONFIG_STACK_GROWSUP
 	if (write) {