From: Jens Axboe <[email protected]>
To: Eugene Syromiatnikov <[email protected]>,
[email protected], [email protected],
Alexander Viro <[email protected]>
Cc: [email protected], Jeff Moyer <[email protected]>,
"Dmitry V. Levin" <[email protected]>
Subject: Re: [PATCH] io_uring: fix compat for IORING_REGISTER_FILES_UPDATE
Date: Wed, 15 Jan 2020 09:41:58 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 1/15/20 9:35 AM, Eugene Syromiatnikov wrote:
> fds field of struct io_uring_files_update is problematic with regards
> to compat user space, as pointer size is different in 32-bit, 32-on-64-bit,
> and 64-bit user space. In order to avoid custom handling of compat in
> the syscall implementation, make fds __u64 and use u64_to_user_ptr in
> order to retrieve it. Also, align the field naturally and check that
> no garbage is passed there.
Good point, it's an s32 pointer so won't align nicely. But how about
just having it be:
struct io_uring_files_update {
__u32 offset;
__u32 resv;
__s32 *fds;
};
which should align nicely on both 32 and 64-bit?
--
Jens Axboe
next prev parent reply other threads:[~2020-01-15 16:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 16:35 [PATCH] io_uring: fix compat for IORING_REGISTER_FILES_UPDATE Eugene Syromiatnikov
2020-01-15 16:41 ` Jens Axboe [this message]
2020-01-15 16:50 ` Eugene Syromiatnikov
2020-01-15 16:53 ` Jens Axboe
2020-01-15 16:59 ` Eugene Syromiatnikov
2020-01-20 23:51 ` Dmitry V. Levin
2020-01-20 23:54 ` Jens Axboe
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