linux-kernel - [PATCH 4.9 21/53] fuse: honor RLIMIT_FSIZE in fuse_file

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Message-Id: <20190523181714.216443850@linuxfoundation.org>
Date:   Thu, 23 May 2019 21:05:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liu Bo <bo.liu@...ux.alibaba.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 4.9 21/53] fuse: honor RLIMIT_FSIZE in fuse_file_fallocate

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")
Cc: <stable@...r.kernel.org> # v3.5
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/fuse/file.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2961,6 +2961,13 @@ 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);