linux-kernel - Re: [PATCH v5 2/7] vfs: Define new syscalls preadv2,pwritev2

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Message-ID: <x49y4rn29oh.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 06 Nov 2014 18:25:50 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Milosz Tanski <milosz@...in.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, "Theodore Ts'o" <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>, linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 2/7] vfs: Define new syscalls preadv2,pwritev2

Milosz Tanski <milosz@...in.com> writes:

> New syscalls that take an flag argument. This change does not add any specific
> flags.
>
> Signed-off-by: Milosz Tanski <milosz@...in.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
>  fs/read_write.c                   | 176 ++++++++++++++++++++++++++++++--------
>  include/linux/compat.h            |   6 ++
>  include/linux/syscalls.h          |   6 ++
>  include/uapi/asm-generic/unistd.h |   6 +-
>  mm/filemap.c                      |   5 +-
>  5 files changed, 158 insertions(+), 41 deletions(-)
>
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 94b2d34..907735c 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -866,6 +866,8 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
>  		return -EBADF;
>  	if (!(file->f_mode & FMODE_CAN_READ))
>  		return -EINVAL;
> +	if (flags & ~0)
> +		return -EINVAL;
>  
>  	return do_readv_writev(READ, file, vec, vlen, pos, flags);
>  }
> @@ -879,21 +881,23 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
>  		return -EBADF;
>  	if (!(file->f_mode & FMODE_CAN_WRITE))
>  		return -EINVAL;
> +	if (flags & ~0)
> +		return -EINVAL;
>  
>  	return do_readv_writev(WRITE, file, vec, vlen, pos, flags);
>  }

Hi, Milosz,

You've checked for invalid flags for the normal system calls, but not
for the compat variants.  Can you add that in, please?

Thanks!
Jeff
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