From: kernel test robot <lkp@intel.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org
Cc: kbuild-all@lists.01.org, linux-fsdevel@vger.kernel.org,
criu@openvz.org, bpf@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <christian.brauner@ubuntu.com>,
Oleg Nesterov <oleg@redhat.com>,
Cyrill Gorcunov <gorcunov@gmail.com>, Jann Horn <jann@thejh.net>,
Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH 11/17] bpf/task_iter: In task_file_seq_get_next use fnext_task
Date: Tue, 18 Aug 2020 13:39:44 +0800 [thread overview]
Message-ID: <202008181316.x96Qp7qo%lkp@intel.com> (raw)
In-Reply-To: <20200817220425.9389-11-ebiederm@xmission.com>
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Hi "Eric,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on bpf/master]
[also build test WARNING on linus/master v5.9-rc1 next-20200817]
[cannot apply to bpf-next/master linux/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Eric-W-Biederman/exec-Move-unshare_files-to-fix-posix-file-locking-during-exec/20200818-061552
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
config: i386-randconfig-m021-20200818 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
smatch warnings:
kernel/bpf/task_iter.c:162 task_file_seq_get_next() warn: ignoring unreachable code.
# https://github.com/0day-ci/linux/commit/66f80aa453b17f8932b42e18265dba5fdb32490e
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Eric-W-Biederman/exec-Move-unshare_files-to-fix-posix-file-locking-during-exec/20200818-061552
git checkout 66f80aa453b17f8932b42e18265dba5fdb32490e
vim +162 kernel/bpf/task_iter.c
128
129 static struct file *
130 task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info,
131 struct task_struct **task)
132 {
133 struct pid_namespace *ns = info->common.ns;
134 u32 curr_tid = info->tid;
135 struct task_struct *curr_task;
136 unsigned int curr_fd = info->fd;
137
138 /* If this function returns a non-NULL file object,
139 * it held a reference to the task/file.
140 * Otherwise, it does not hold any reference.
141 */
142 again:
143 if (*task) {
144 curr_task = *task;
145 curr_fd = info->fd;
146 } else {
147 curr_task = task_seq_get_next(ns, &curr_tid);
148 if (!curr_task)
149 return NULL;
150
151 /* set *task and info->tid */
152 *task = curr_task;
153 if (curr_tid == info->tid) {
154 curr_fd = info->fd;
155 } else {
156 info->tid = curr_tid;
157 curr_fd = 0;
158 }
159 }
160
161 rcu_read_lock();
> 162 for (;; curr_fd++) {
163 struct file *f;
164
165 f = fnext_task(curr_task, &curr_fd);
166 if (!f)
167 break;
168
169 /* set info->fd */
170 info->fd = curr_fd;
171 get_file(f);
172 rcu_read_unlock();
173 return f;
174 }
175
176 /* the current task is done, go to the next task */
177 rcu_read_unlock();
178 put_task_struct(curr_task);
179 *task = NULL;
180 info->fd = 0;
181 curr_tid = ++(info->tid);
182 goto again;
183 }
184
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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next prev parent reply other threads:[~2020-08-18 5:51 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 22:03 exec: Move unshare_files and guarantee files_struct.count is correct Eric W. Biederman
2020-08-17 22:04 ` [PATCH 01/17] exec: Move unshare_files to fix posix file locking during exec Eric W. Biederman
2020-08-18 10:04 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 02/17] exec: Simplify unshare_files Eric W. Biederman
2020-08-18 10:08 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 03/17] exec: Remove reset_files_struct Eric W. Biederman
2020-08-18 10:09 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 04/17] kcmp: In kcmp_epoll_target use fget_task Eric W. Biederman
2020-08-20 21:45 ` Cyrill Gorcunov
2020-08-17 22:04 ` [PATCH 05/17] bpf: In bpf_task_fd_query " Eric W. Biederman
2020-08-17 22:04 ` [PATCH 06/17] file: Implement fcheck_task Eric W. Biederman
2020-08-18 10:37 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 07/17] proc/fd: In tid_fd_mode use fcheck_task Eric W. Biederman
2020-08-18 10:36 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 08/17] proc/fd: In proc_fd_link " Eric W. Biederman
2020-08-18 10:36 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 09/17] file: Implement fnext_task Eric W. Biederman
2020-08-17 23:54 ` Linus Torvalds
[not found] ` <875z9g7oln.fsf@x220.int.ebiederm.org>
2020-08-18 1:17 ` Linus Torvalds
2020-08-18 11:05 ` Christian Brauner
[not found] ` <87pn7m22kn.fsf@x220.int.ebiederm.org>
2020-08-19 15:54 ` Alexei Starovoitov
[not found] ` <871rk0t45v.fsf@x220.int.ebiederm.org>
2020-08-21 16:17 ` Alexei Starovoitov
2020-08-19 18:32 ` Linus Torvalds
2020-08-20 21:50 ` Cyrill Gorcunov
2020-08-17 22:04 ` [PATCH 10/17] proc/fd: In proc_readfd_common use fnext_task Eric W. Biederman
2020-08-18 2:22 ` Al Viro
[not found] ` <87sgck4o23.fsf@x220.int.ebiederm.org>
2020-08-18 4:59 ` Alexei Starovoitov
2020-08-17 22:04 ` [PATCH 11/17] bpf/task_iter: In task_file_seq_get_next " Eric W. Biederman
2020-08-18 5:39 ` kernel test robot [this message]
2020-08-18 12:54 ` Eric W. Biederman
2020-08-17 22:04 ` [PATCH 12/17] proc/fd: In fdinfo seq_show don't use get_files_struct Eric W. Biederman
2020-08-18 0:08 ` Linus Torvalds
[not found] ` <87v9hg69ph.fsf@x220.int.ebiederm.org>
2020-08-18 1:21 ` Linus Torvalds
2020-08-18 10:43 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 13/17] file: Remove get_files_struct Eric W. Biederman
2020-08-18 10:39 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 14/17] file: Merge __fd_install into fd_install Eric W. Biederman
2020-08-18 10:15 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 15/17] file: In f_dupfd read RLIMIT_NOFILE once Eric W. Biederman
2020-08-18 10:12 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 16/17] file: Merge __alloc_fd into alloc_fd Eric W. Biederman
2020-08-18 10:17 ` Christian Brauner
2020-08-17 22:04 ` [PATCH 17/17] file: Rename __close_fd to close_fd and remove the files parameter Eric W. Biederman
2020-08-18 10:19 ` Christian Brauner
2020-08-18 11:20 ` Christoph Hellwig
2020-08-18 12:48 ` Eric W. Biederman
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