From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
ast@kernel.org, axboe@kernel.dk, bfields@fieldses.org,
bridge@lists.linux-foundation.org, chainsaw@gentoo.org,
christian.brauner@ubuntu.com, chuck.lever@oracle.com,
davem@davemloft.net, dhowells@redhat.com,
gregkh@linuxfoundation.org, jarkko.sakkinen@linux.intel.com,
jmorris@namei.org, josh@joshtriplett.org, keescook@chromium.org,
keyrings@vger.kernel.org, kuba@kernel.org,
lars.ellenberg@linbit.com, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-security-module@vger.kernel.org,
nikolay@cumulusnetworks.com, philipp.reisner@linbit.com,
ravenexp@gmail.com, roopa@cumulusnetworks.com, serge@hallyn.com,
slyfox@gentoo.org, viro@zeniv.linux.org.uk,
yangtiezhu@loongson.cn, netdev@vger.kernel.org,
markward@linux.ibm.com, linux-s390 <linux-s390@vger.kernel.org>
Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected)
Date: Thu, 2 Jul 2020 13:26:53 +0900 [thread overview]
Message-ID: <e3f3e501-2cb7-b683-4b85-2002b7603244@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20200701153859.GT4332@42.do-not-panic.com>
On 2020/07/02 0:38, Luis Chamberlain wrote:
> @@ -156,6 +156,18 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
> */
> if (KWIFEXITED(ret))
> sub_info->retval = KWEXITSTATUS(ret);
> + /*
> + * Do we really want to be passing the signal, or do we pass
> + * a single error code for all cases?
> + */
> + else if (KWIFSIGNALED(ret))
> + sub_info->retval = KWTERMSIG(ret);
No, this is bad. Caller of usermode helper is unable to distinguish exit(9)
and e.g. SIGKILL'ed by the OOM-killer. Please pass raw exit status value.
I feel that caller of usermode helper should not use exit status value.
For example, call_sbin_request_key() is checking
test_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags) || key_validate(key) < 0
condition (if usermode helper was invoked) in order to "ignore any errors from
userspace if the key was instantiated".
> + /* Same here */
> + else if (KWIFSTOPPED((ret)))
> + sub_info->retval = KWSTOPSIG(ret);
> + /* And are we really sure we want this? */
> + else if (KWIFCONTINUED((ret)))
> + sub_info->retval = 0;
> }
>
> /* Restore default kernel sig handler */
>
next prev parent reply other threads:[~2020-07-02 4:28 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-10 15:49 [PATCH 0/5] kmod/umh: a few fixes Luis R. Rodriguez
2020-06-10 15:49 ` [PATCH 1/5] selftests: kmod: Use variable NAME in kmod_test_0001() Luis R. Rodriguez
2020-06-10 15:49 ` [PATCH 2/5] kmod: Remove redundant "be an" in the comment Luis R. Rodriguez
2020-06-10 15:49 ` [PATCH 3/5] test_kmod: Avoid potential double free in trigger_config_run_type() Luis R. Rodriguez
2020-06-10 15:49 ` [PATCH 4/5] umh: fix processed error when UMH_WAIT_PROC is used Luis R. Rodriguez
2020-06-23 14:11 ` linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected) Christian Borntraeger
2020-06-23 14:23 ` Christian Borntraeger
2020-06-24 11:11 ` Christian Borntraeger
2020-06-24 12:05 ` Luis Chamberlain
2020-06-24 13:17 ` Luis Chamberlain
2020-06-24 16:13 ` Luis Chamberlain
2020-06-24 14:43 ` Christoph Hellwig
2020-06-24 15:54 ` Christian Borntraeger
2020-06-24 16:09 ` Luis Chamberlain
2020-06-24 17:58 ` Christian Borntraeger
2020-06-24 18:09 ` Christian Borntraeger
2020-06-24 18:32 ` Christian Borntraeger
2020-06-24 18:37 ` Christian Borntraeger
2020-06-25 13:26 ` Christian Borntraeger
2020-06-26 2:54 ` Luis Chamberlain
2020-06-26 5:22 ` Christian Borntraeger
2020-06-26 9:00 ` Christoph Hellwig
2020-06-26 11:40 ` Luis Chamberlain
2020-06-26 11:50 ` Luis Chamberlain
2020-06-30 17:57 ` Luis Chamberlain
2020-07-01 10:08 ` Christian Borntraeger
2020-07-01 13:24 ` Tetsuo Handa
2020-07-01 13:53 ` Luis Chamberlain
2020-07-01 14:08 ` Tetsuo Handa
2020-07-01 15:38 ` Luis Chamberlain
2020-07-01 15:48 ` Christian Borntraeger
2020-07-01 15:58 ` Luis Chamberlain
2020-07-01 16:01 ` Christian Borntraeger
2020-07-02 4:26 ` Tetsuo Handa [this message]
2020-07-02 19:46 ` Luis Chamberlain
2020-07-03 0:52 ` Tetsuo Handa
2020-07-03 13:28 ` Luis Chamberlain
2020-07-01 15:26 ` Christian Borntraeger
2020-07-01 13:46 ` Luis Chamberlain
2020-06-10 15:49 ` [PATCH 5/5] selftests: simplify kmod failure value Luis R. Rodriguez
2020-06-18 0:43 ` [PATCH 0/5] kmod/umh: a few fixes Andrew Morton
2020-06-19 20:46 ` Luis Chamberlain
2020-06-19 21:07 ` Luis Chamberlain
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