From: "zhangyi (F)" <yi.zhang@huawei.com>
To: <gregkh@linuxfoundation.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
<luto@kernel.org>, <adobriyan@gmail.com>,
<akpm@linux-foundation.org>, <vbabka@suse.cz>,
<peterz@infradead.org>, <bigeasy@linutronix.de>,
<mhocko@suse.com>, <john.ogness@linutronix.de>,
<yi.zhang@huawei.com>, <nixiaoming@huawei.com>
Subject: [PATCH 4.4 7/7] fs/proc/array.c: allow reporting eip/esp for all coredumping threads
Date: Mon, 2 Dec 2019 16:35:19 +0800 [thread overview]
Message-ID: <20191202083519.23138-8-yi.zhang@huawei.com> (raw)
In-Reply-To: <20191202083519.23138-1-yi.zhang@huawei.com>
From: John Ogness <john.ogness@linutronix.de>
commit cb8f381f1613cafe3aec30809991cd56e7135d92 upstream.
0a1eb2d474ed ("fs/proc: Stop reporting eip and esp in /proc/PID/stat")
stopped reporting eip/esp and fd7d56270b52 ("fs/proc: Report eip/esp in
/prod/PID/stat for coredumping") reintroduced the feature to fix a
regression with userspace core dump handlers (such as minicoredumper).
Because PF_DUMPCORE is only set for the primary thread, this didn't fix
the original problem for secondary threads. Allow reporting the eip/esp
for all threads by checking for PF_EXITING as well. This is set for all
the other threads when they are killed. coredump_wait() waits for all the
tasks to become inactive before proceeding to invoke a core dumper.
Link: http://lkml.kernel.org/r/87y32p7i7a.fsf@linutronix.de
Link: http://lkml.kernel.org/r/20190522161614.628-1-jlu@pengutronix.de
Fixes: fd7d56270b526ca3 ("fs/proc: Report eip/esp in /prod/PID/stat for coredumping")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reported-by: Jan Luebbe <jlu@pengutronix.de>
Tested-by: Jan Luebbe <jlu@pengutronix.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
---
fs/proc/array.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 42e33ea50d1c..6238f45eed02 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -434,7 +434,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
* a program is not able to use ptrace(2) in that case. It is
* safe because the task has stopped executing permanently.
*/
- if (permitted && (task->flags & PF_DUMPCORE)) {
+ if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
if (try_get_task_stack(task)) {
eip = KSTK_EIP(task);
esp = KSTK_ESP(task);
--
2.17.2
next prev parent reply other threads:[~2019-12-02 8:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 8:35 [PATCH 4.4 0/7] fs/proc: Stop reporting eip and esp in zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 1/7] sched/core: Allow putting thread_info into task_struct zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 2/7] sched/core: Add try_get_task_stack() and put_task_stack() zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 3/7] sched/core, x86: Make struct thread_info arch specific again zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 4/7] fs/proc: Stop reporting eip and esp in /proc/PID/stat zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 5/7] fs/proc: Report eip/esp in /prod/PID/stat for coredumping zhangyi (F)
2019-12-02 8:35 ` [PATCH 4.4 6/7] proc: fix coredump vs read /proc/*/stat race zhangyi (F)
2019-12-02 8:35 ` zhangyi (F) [this message]
2019-12-12 17:15 ` [PATCH 4.4 0/7] fs/proc: Stop reporting eip and esp in Greg KH
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