linux-kernel - [PATCH 3.16 047/132] fuse: honor RLIMIT_FSIZE in fuse_file

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Message-ID: <lsq.1568989415.97143488@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Miklos Szeredi" <mszeredi@...hat.com>,
        "Liu Bo" <bo.liu@...ux.alibaba.com>
Subject: [PATCH 3.16 047/132] fuse: honor RLIMIT_FSIZE in fuse_file_fallocate

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo.liu@...ux.alibaba.com>

commit 0cbade024ba501313da3b7e5dd2a188a6bc491b5 upstream.

fstests generic/228 reported this failure that fuse fallocate does not
honor what 'ulimit -f' has set.

This adds the necessary inode_newsize_ok() check.

Signed-off-by: Liu Bo <bo.liu@...ux.alibaba.com>
Fixes: 05ba1f082300 ("fuse: add FALLOCATE operation")
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/fuse/file.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3017,6 +3017,13 @@ static long fuse_file_fallocate(struct f
 		}
 	}
 
+	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
+	    offset + length > i_size_read(inode)) {
+		err = inode_newsize_ok(inode, offset + length);
+		if (err)
+			return err;
+	}
+
 	if (!(mode & FALLOC_FL_KEEP_SIZE))
 		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);