linux-kernel - [PATCH V7 -next 05/33] fuse: convert fuse to use iov_iter_copy_[to|from]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1362783148-22736-6-git-send-email-dave.kleikamp@oracle.com>
Date:	Fri,  8 Mar 2013 16:52:00 -0600
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	Zach Brown <zab@...bo.net>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	fuse-devel@...ts.sourceforge.net
Subject: [PATCH V7 -next 05/33] fuse: convert fuse to use iov_iter_copy_[to|from]_user

A future patch hides the internals of struct iov_iter, so fuse should
be using the supported interface.

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Acked-by: Miklos Szeredi <mszeredi@...e.cz>
Cc: fuse-devel@...ts.sourceforge.net
---
 fs/fuse/file.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f2ae8fd..6d5f1ed 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1733,30 +1733,17 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
 	while (iov_iter_count(&ii)) {
 		struct page *page = pages[page_idx++];
 		size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii));
-		void *kaddr;
+		size_t left;
 
-		kaddr = kmap(page);
-
-		while (todo) {
-			char __user *uaddr = ii.iov->iov_base + ii.iov_offset;
-			size_t iov_len = ii.iov->iov_len - ii.iov_offset;
-			size_t copy = min(todo, iov_len);
-			size_t left;
-
-			if (!to_user)
-				left = copy_from_user(kaddr, uaddr, copy);
-			else
-				left = copy_to_user(uaddr, kaddr, copy);
-
-			if (unlikely(left))
-				return -EFAULT;
+		if (!to_user)
+			left = iov_iter_copy_from_user(page, &ii, 0, todo);
+		else
+			left = iov_iter_copy_to_user(page, &ii, 0, todo);
 
-			iov_iter_advance(&ii, copy);
-			todo -= copy;
-			kaddr += copy;
-		}
+		if (unlikely(left))
+			return -EFAULT;
 
-		kunmap(page);
+		iov_iter_advance(&ii, todo);
 	}
 
 	return 0;
-- 
1.8.1.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/