From: Pavel Boldin <pboldin@mirantis.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2] Fix `eventfd_link' module leakages and races
Date: Mon, 23 Mar 2015 13:36:46 +0200 [thread overview]
Message-ID: <CACf4_B8buRSAPCFO+fWJjQ8it5n0cgN789jSrsB6Bc-cJGOyHQ@mail.gmail.com> (raw)
In-Reply-To: <2544479.OZtlEpgWBm@xps13>
Hi Thomas,
There is by far more than 2 issues, but these are the only ones that
appeared to us.
The list of the issues that motivated the refactoring:
1. Only one error code for every fault (-EFAULT).
2. Copy-paste code from the `fget' function.
3. Ambiguous variable names. The `files' variable mean different things
under the same block. This ruins readability of the code.
4. Overall placing of the all the code inside one `switch/case'. Modern
kernel code style suggests placing these in the inline functions.
5. Usage of the copy-pasted `close_fd' function code. (I really should
use `sys_close' here though).
I can rewrite the refactoring in a set of small patches if this will aid
reviewers.
The dangerous bug that definitely must be fixed before the next release is
the `struct file*' leakage. I can provide a simple patch for this as a
separate submission and continue working on the refactoring patches. Is
this plan OK for you?
Pavel
On Mon, Mar 23, 2015 at 1:15 PM, Thomas Monjalon <thomas.monjalon@6wind.com>
wrote:
> Hi Pavel,
>
> You forgot the Signed-off-by line.
>
> Huawei, Changchun, any comment on this patch?
>
> 2015-03-18 15:16, Pavel Boldin:
> > The `eventfd_link' module provides an API to "steal" fd from another
> > process had been written with a bug that leaks `struct file' because
> > of the extra reference counter increment and missing `fput' call.
> >
> > The other bug is using another process' `task_struct' without
> incrementing
> > a reference counter.
>
> As there are 2 bugs, you should provide 2 patches.
>
> > Fix these bugs and refactor the module.
>
> Why refactoring along with the bug fixes?
> You'd have more chances to have your fixes integrated in 2.0 without
> refactoring.
>
> Thanks
>
>
>
>
next prev parent reply other threads:[~2015-03-23 11:36 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-16 16:40 [dpdk-dev] [PATCH] " Pavel Boldin
2015-03-16 17:55 ` Neil Horman
2015-03-17 1:29 ` Ouyang, Changchun
2015-03-20 15:57 ` Pavel Boldin
2015-03-18 13:16 ` [dpdk-dev] [PATCH v2] " Pavel Boldin
2015-03-23 11:15 ` Thomas Monjalon
2015-03-23 11:36 ` Pavel Boldin [this message]
2015-03-23 11:44 ` Thomas Monjalon
2015-03-23 15:15 ` [dpdk-dev] [PATCH v3] vhost: Refactor module `eventfd_link' Pavel Boldin
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 0/5] " Pavel Boldin
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 1/5] vhost: eventfd_link: moving ioctl to a function Pavel Boldin
2015-05-07 7:57 ` Xie, Huawei
[not found] ` <CACf4_B8MDfkaEk5jMjMbEw9F8LsBVLA9TUWwOBU=SCAxzFmSFw@mail.gmail.com>
2015-05-18 6:06 ` Xie, Huawei
2015-05-18 9:16 ` Pavel Boldin
2015-06-18 3:08 ` Xie, Huawei
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 2/5] vhost: eventfd_link: add function fget_from_files Pavel Boldin
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 3/5] vhost: eventfd_link: fix ioctl return values Pavel Boldin
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 4/5] vhost: eventfd_link: replace copy-pasted sys_close Pavel Boldin
2015-04-02 17:01 ` [dpdk-dev] [PATCH v4 5/5] vhost: eventfd_link: removing extra #includes Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 0/5] Refactor module `eventfd_link' Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 1/5] vhost: eventfd_link: moving ioctl to a function Pavel Boldin
2015-08-28 18:51 ` [dpdk-dev] [PATCH v5 1/4] vhost: eventfd_link: refactoring EVENTFD_COPY handler Pavel Boldin
2015-09-23 20:25 ` Pavel Boldin
2015-09-29 19:42 ` Thomas Monjalon
2015-09-29 23:29 ` Pavel Boldin
2015-10-20 9:06 ` Xie, Huawei
2015-10-28 18:33 ` [dpdk-dev] [PATCH v6 0/3] vhost: eventfd_link refactoring Pavel Boldin
2015-10-29 18:33 ` Xie, Huawei
2015-10-30 19:10 ` Thomas Monjalon
2015-10-28 18:33 ` [dpdk-dev] [PATCH v6 1/3] vhost: eventfd_link: refactoring EVENTFD_COPY handler Pavel Boldin
2015-10-28 18:33 ` [dpdk-dev] [PATCH v6 2/3] vhost: add EVENTFD_COPY2 ioctl Pavel Boldin
2015-10-28 18:33 ` [dpdk-dev] [PATCH v6 3/3] vhost: using EVENTFD_COPY2 Pavel Boldin
2015-08-28 18:51 ` [dpdk-dev] [PATCH v5 2/4] vhost: add EVENTFD_COPY2 ioctl Pavel Boldin
2015-10-20 9:43 ` Xie, Huawei
2015-08-28 18:51 ` [dpdk-dev] [PATCH v5 3/4] vhost: using EVENTFD_COPY2 Pavel Boldin
2015-10-20 9:52 ` Xie, Huawei
2015-10-21 12:16 ` Pavel Boldin
2015-10-26 1:45 ` Xie, Huawei
2015-10-28 18:35 ` Pavel Boldin
2015-08-28 18:51 ` [dpdk-dev] [PATCH v5 4/4] DO NOT MERGE: Tests for new eventfd_link module Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 2/5] vhost: eventfd_link: add function fget_from_files Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 3/5] vhost: eventfd_link: fix ioctl return values Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 4/5] vhost: eventfd_link: replace copy-pasted sys_close Pavel Boldin
2015-05-07 6:54 ` Xie, Huawei
2015-06-17 15:24 ` Thomas Monjalon
2015-07-09 0:59 ` Thomas Monjalon
2015-07-10 14:27 ` Xie, Huawei
2015-07-10 14:50 ` Pavel Boldin
2015-07-10 15:32 ` Xie, Huawei
2015-07-10 15:42 ` Xie, Huawei
2015-07-10 15:49 ` Thomas Monjalon
2015-07-10 16:06 ` Xie, Huawei
2015-07-11 15:08 ` Pavel Boldin
2015-07-13 1:59 ` Xie, Huawei
2015-07-19 12:39 ` Pavel Boldin
2015-04-16 11:48 ` [dpdk-dev] [PATCH v5 5/5] vhost: eventfd_link: removing extra #includes Pavel Boldin
2015-04-28 14:35 ` [dpdk-dev] [PATCH v5 0/5] Refactor module `eventfd_link' Thomas Monjalon
2015-05-04 5:29 ` Xie, Huawei
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