suppress page allocation failure warnings from sys_listxattr

From: Dave Jones
Date: Tue Mar 13 2012 - 14:22:23 EST


This size is user controllable, and so it's trivial for someone to trigger a
stream of order:4 page allocation errors.

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

---
There's also a similar problem in setxattr, but I'm not sure how we want
to pass NOWARN down to memdup_user. Thoughts ?

diff --git a/fs/xattr.c b/fs/xattr.c
index 82f4337..544df90 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -496,7 +496,7 @@ listxattr(struct dentry *d, char __user *list, size_t size)
if (size) {
if (size > XATTR_LIST_MAX)
size = XATTR_LIST_MAX;
- klist = kmalloc(size, GFP_KERNEL);
+ klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
if (!klist)
return -ENOMEM;
}
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