From: Bernd Edlinger <bernd.edlinger@hotmail.de>
To: Kirill Tkhai <ktkhai@virtuozzo.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>,
Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Oleg Nesterov <oleg@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>,
Andrei Vagin <avagin@gmail.com>, Ingo Molnar <mingo@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Yuyang Du <duyuyang@gmail.com>,
David Hildenbrand <david@redhat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Anshuman Khandual <anshuman.khandual@arm.com>,
David Howells <dhowells@redhat.com>,
James Morris <jamorris@linux.microsoft.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Shakeel Butt <shakeelb@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Christian Kellner <christian@kellner.me>,
Andrea Arcangeli <aarcange@redhat.com>,
Aleksa Sarai <cyphar@cyphar.com>,
"Dmitry V. Levin" <ldv@altlinux.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>
Subject: Re: [PATCH v3 5/5] exec: Add a exec_update_mutex to replace cred_guard_mutex
Date: Wed, 18 Mar 2020 21:06:16 +0100 [thread overview]
Message-ID: <AM6PR03MB5170110A5D332DD0C1AC929FE4F70@AM6PR03MB5170.eurprd03.prod.outlook.com> (raw)
In-Reply-To: <13c4d333-9c33-8036-3142-dac22c392c60@virtuozzo.com>
On 3/18/20 1:22 PM, Kirill Tkhai wrote:
> On 18.03.2020 00:53, Bernd Edlinger wrote:
>> On 3/17/20 9:56 AM, Kirill Tkhai wrote:
>>> On 14.03.2020 12:11, Bernd Edlinger wrote:
>>>> The cred_guard_mutex is problematic. The cred_guard_mutex is held
>>>> over the userspace accesses as the arguments from userspace are read.
>>>> The cred_guard_mutex is held of PTRACE_EVENT_EXIT as the the other
>>>> threads are killed. The cred_guard_mutex is held over
>>>> "put_user(0, tsk->clear_child_tid)" in exit_mm().
>>>>
>>>> Any of those can result in deadlock, as the cred_guard_mutex is held
>>>> over a possible indefinite userspace waits for userspace.
>>>>
>>>> Add exec_update_mutex that is only held over exec updating process
>>>> with the new contents of exec, so that code that needs not to be
>>>> confused by exec changing the mm and the cred in ways that can not
>>>> happen during ordinary execution of a process.
>>>>
>>>> The plan is to switch the users of cred_guard_mutex to
>>>> exec_udpate_mutex one by one. This lets us move forward while still
>>>> being careful and not introducing any regressions.
>>>>
>>>> Link: https://lore.kernel.org/lkml/20160921152946.GA24210@dhcp22.suse.cz/
>>>> Link: https://lore.kernel.org/lkml/AM6PR03MB5170B06F3A2B75EFB98D071AE4E60@AM6PR03MB5170.eurprd03.prod.outlook.com/
>>>> Link: https://lore.kernel.org/linux-fsdevel/20161102181806.GB1112@redhat.com/
>>>> Link: https://lore.kernel.org/lkml/20160923095031.GA14923@redhat.com/
>>>> Link: https://lore.kernel.org/lkml/20170213141452.GA30203@redhat.com/
>>>> Ref: 45c1a159b85b ("Add PTRACE_O_TRACEVFORKDONE and PTRACE_O_TRACEEXIT facilities.")
>>>> Ref: 456f17cd1a28 ("[PATCH] user-vm-unlock-2.5.31-A2")
>>>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>>>> Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
>>>> ---
>>>> fs/exec.c | 17 ++++++++++++++---
>>>> include/linux/binfmts.h | 8 +++++++-
>>>> include/linux/sched/signal.h | 9 ++++++++-
>>>> init/init_task.c | 1 +
>>>> kernel/fork.c | 1 +
>>>> 5 files changed, 31 insertions(+), 5 deletions(-)
>>>>
>>>> v3: this update fixes lock-order and adds an explicit data member in linux_binprm
>>>>
>>>> diff --git a/fs/exec.c b/fs/exec.c
>>>> index d820a72..11974a1 100644
>>>> --- a/fs/exec.c
>>>> +++ b/fs/exec.c
>>>> @@ -1014,12 +1014,17 @@ static int exec_mmap(struct mm_struct *mm)
>>>> {
>>>> struct task_struct *tsk;
>>>> struct mm_struct *old_mm, *active_mm;
>>>> + int ret;
>>>>
>>>> /* Notify parent that we're no longer interested in the old VM */
>>>> tsk = current;
>>>> old_mm = current->mm;
>>>> exec_mm_release(tsk, old_mm);
>>>>
>>>> + ret = mutex_lock_killable(&tsk->signal->exec_update_mutex);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> if (old_mm) {
>>>> sync_mm_rss(old_mm);
>>>> /*
>>>> @@ -1031,9 +1036,11 @@ static int exec_mmap(struct mm_struct *mm)
>>>> down_read(&old_mm->mmap_sem);
>>>> if (unlikely(old_mm->core_state)) {
>>>> up_read(&old_mm->mmap_sem);
>>>> + mutex_unlock(&tsk->signal->exec_update_mutex);
>>>> return -EINTR;
>>>> }
>>>> }
>>>> +
>>>> task_lock(tsk);
>>>> active_mm = tsk->active_mm;
>>>> membarrier_exec_mmap(mm);
>>>> @@ -1288,11 +1295,12 @@ int flush_old_exec(struct linux_binprm * bprm)
>>>> goto out;
>>>>
>>>> /*
>>>> - * After clearing bprm->mm (to mark that current is using the
>>>> - * prepared mm now), we have nothing left of the original
>>>> + * After setting bprm->called_exec_mmap (to mark that current is
>>>> + * using the prepared mm now), we have nothing left of the original
>>>> * process. If anything from here on returns an error, the check
>>>> * in search_binary_handler() will SEGV current.
>>>> */
>>>> + bprm->called_exec_mmap = 1;
>>>
>>> The two below is non-breaking pair:
>>>
>>> exec_mmap(bprm->mm);
>>> bprm->called_exec_mmap = 1;
>>>
>>> Why not move this into exec_mmap(), so nobody definitely inserts something
>>> between them?
>>>
>>
>> Hmm, could be done, but then I would probably need a different name than
>> "called_exec_mmap".
>>
>> How about adding a nice function comment to exec_mmap that calls out the
>> changed behaviour that the exec_update_mutex is taken unless the function
>> fails?
>
> Not sure, I understand correct.
>
> Could you post this like a small patch hunk (on top of anything you want)?
>
I was thinking of something like that:
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1010,6 +1010,11 @@ ssize_t read_code(struct file *file, unsigned long addr,
}
EXPORT_SYMBOL(read_code);
+/*
+ * Maps the mm_struct mm into the current task struct.
+ * On success, this function returns with the mutex
+ * exec_update_mutex locked.
+ */
static int exec_mmap(struct mm_struct *mm)
{
struct task_struct *tsk;
>> Bernd.
>>
>>
>>>> bprm->mm = NULL;
>>>>
>>>> #ifdef CONFIG_POSIX_TIMERS
>>>> @@ -1438,6 +1446,8 @@ static void free_bprm(struct linux_binprm *bprm)
>>>> {
>>>> free_arg_pages(bprm);
>>>> if (bprm->cred) {
>>>> + if (bprm->called_exec_mmap)
>>>> + mutex_unlock(¤t->signal->exec_update_mutex);
>>>> mutex_unlock(¤t->signal->cred_guard_mutex);
>>>> abort_creds(bprm->cred);
>>>> }
>>>> @@ -1487,6 +1497,7 @@ void install_exec_creds(struct linux_binprm *bprm)
>>>> * credentials; any time after this it may be unlocked.
>>>> */
>>>> security_bprm_committed_creds(bprm);
>>>> + mutex_unlock(¤t->signal->exec_update_mutex);
>>>> mutex_unlock(¤t->signal->cred_guard_mutex);
>>>> }
>>>> EXPORT_SYMBOL(install_exec_creds);
>>>> @@ -1678,7 +1689,7 @@ int search_binary_handler(struct linux_binprm *bprm)
>>>>
>>>> read_lock(&binfmt_lock);
>>>> put_binfmt(fmt);
>>>> - if (retval < 0 && !bprm->mm) {
>>>> + if (retval < 0 && bprm->called_exec_mmap) {
>>>> /* we got to flush_old_exec() and failed after it */
>>>> read_unlock(&binfmt_lock);
>>>> force_sigsegv(SIGSEGV);
>>>> diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
>>>> index b40fc63..a345d9f 100644
>>>> --- a/include/linux/binfmts.h
>>>> +++ b/include/linux/binfmts.h
>>>> @@ -44,7 +44,13 @@ struct linux_binprm {
>>>> * exec has happened. Used to sanitize execution environment
>>>> * and to set AT_SECURE auxv for glibc.
>>>> */
>>>> - secureexec:1;
>>>> + secureexec:1,
>>>> + /*
>>>> + * Set by flush_old_exec, when exec_mmap has been called.
>>>> + * This is past the point of no return, when the
>>>> + * exec_update_mutex has been taken.
>>>> + */
>>>> + called_exec_mmap:1;
>>>> #ifdef __alpha__
>>>> unsigned int taso:1;
>>>> #endif
>>>> diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
>>>> index 8805025..a29df79 100644
>>>> --- a/include/linux/sched/signal.h
>>>> +++ b/include/linux/sched/signal.h
>>>> @@ -224,7 +224,14 @@ struct signal_struct {
>>>>
>>>> struct mutex cred_guard_mutex; /* guard against foreign influences on
>>>> * credential calculations
>>>> - * (notably. ptrace) */
>>>> + * (notably. ptrace)
>>>> + * Deprecated do not use in new code.
>>>> + * Use exec_update_mutex instead.
>>>> + */
>>>> + struct mutex exec_update_mutex; /* Held while task_struct is being
>>>> + * updated during exec, and may have
>>>> + * inconsistent permissions.
>>>> + */
>>>> } __randomize_layout;
>>>>
>>>> /*
>>>> diff --git a/init/init_task.c b/init/init_task.c
>>>> index 9e5cbe5..bd403ed 100644
>>>> --- a/init/init_task.c
>>>> +++ b/init/init_task.c
>>>> @@ -26,6 +26,7 @@
>>>> .multiprocess = HLIST_HEAD_INIT,
>>>> .rlim = INIT_RLIMITS,
>>>> .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
>>>> + .exec_update_mutex = __MUTEX_INITIALIZER(init_signals.exec_update_mutex),
>>>> #ifdef CONFIG_POSIX_TIMERS
>>>> .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
>>>> .cputimer = {
>>>> diff --git a/kernel/fork.c b/kernel/fork.c
>>>> index 8642530..036b692 100644
>>>> --- a/kernel/fork.c
>>>> +++ b/kernel/fork.c
>>>> @@ -1594,6 +1594,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
>>>> sig->oom_score_adj_min = current->signal->oom_score_adj_min;
>>>>
>>>> mutex_init(&sig->cred_guard_mutex);
>>>> + mutex_init(&sig->exec_update_mutex);
>>>>
>>>> return 0;
>>>> }
>>>>
>>>
>
next prev parent reply other threads:[~2020-03-18 20:06 UTC|newest]
Thread overview: 203+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-01 11:27 [PATCH] exec: Fix a deadlock in ptrace Bernd Edlinger
2020-03-01 15:13 ` Aleksa Sarai
2020-03-01 15:58 ` Christian Brauner
2020-03-01 17:46 ` Bernd Edlinger
2020-03-01 18:20 ` Christian Brauner
2020-03-01 17:24 ` Bernd Edlinger
2020-03-01 18:21 ` Jann Horn
2020-03-01 18:52 ` Christian Brauner
2020-03-01 19:00 ` Bernd Edlinger
2020-03-01 20:00 ` Jann Horn
2020-03-01 20:34 ` [PATCHv2] " Bernd Edlinger
2020-03-02 6:38 ` Eric W. Biederman
2020-03-02 15:43 ` Bernd Edlinger
2020-03-02 15:57 ` Eric W. Biederman
2020-03-02 16:02 ` Bernd Edlinger
2020-03-02 16:17 ` Eric W. Biederman
2020-03-02 16:43 ` Jann Horn
2020-03-02 17:01 ` Bernd Edlinger
2020-03-02 17:37 ` Jann Horn
2020-03-02 17:42 ` christian
2020-03-02 18:08 ` Jann Horn
2020-03-02 20:10 ` [PATCHv3] " Bernd Edlinger
2020-03-02 20:28 ` Bernd Edlinger
2020-03-02 17:13 ` [PATCHv2] " Bernd Edlinger
2020-03-02 21:49 ` Eric W. Biederman
2020-03-02 22:00 ` Bernd Edlinger
2020-03-02 22:18 ` [PATCHv4] " Bernd Edlinger
2020-03-03 2:26 ` Kees Cook
2020-03-03 4:54 ` Bernd Edlinger
2020-03-03 5:29 ` Kees Cook
2020-03-03 8:08 ` Bernd Edlinger
2020-03-03 8:34 ` Christian Brauner
2020-03-03 8:43 ` Christian Brauner
2020-03-04 15:30 ` Christian Brauner
2020-03-03 8:58 ` Christian Brauner
2020-03-03 10:34 ` Bernd Edlinger
2020-03-03 11:23 ` Bernd Edlinger
2020-03-03 14:20 ` Christian Brauner
2020-03-03 13:02 ` [PATCHv5] " Bernd Edlinger
2020-03-03 15:18 ` Eric W. Biederman
2020-03-03 16:48 ` Bernd Edlinger
2020-03-03 17:01 ` Christian Brauner
2020-03-03 17:20 ` Christian Brauner
2020-03-03 20:08 ` Eric W. Biederman
2020-03-04 14:37 ` Bernd Edlinger
2020-03-04 16:33 ` Eric W. Biederman
2020-03-04 21:49 ` Bernd Edlinger
2020-03-04 21:56 ` [PATCHv6] " Bernd Edlinger
2020-03-05 18:36 ` Bernd Edlinger
2020-03-05 21:14 ` [PATCH 0/2] Infrastructure to allow fixing exec deadlocks Eric W. Biederman
2020-03-05 21:15 ` [PATCH 1/2] exec: Properly mark the point of no return Eric W. Biederman
2020-03-05 22:34 ` Bernd Edlinger
2020-03-06 5:19 ` Eric W. Biederman
2020-03-05 22:56 ` Bernd Edlinger
2020-03-06 5:09 ` Eric W. Biederman
2020-03-06 16:26 ` Bernd Edlinger
2020-03-06 17:16 ` Eric W. Biederman
2020-03-05 21:16 ` [PATCH 2/2] exec: Add a exec_update_mutex to replace cred_guard_mutex Eric W. Biederman
2020-03-05 21:51 ` Bernd Edlinger
2020-03-06 5:17 ` Eric W. Biederman
2020-03-06 11:46 ` Bernd Edlinger
2020-03-06 21:18 ` Eric W. Biederman
2020-03-06 19:16 ` Bernd Edlinger
2020-03-06 21:58 ` Eric W. Biederman
2020-03-06 22:29 ` Eric W. Biederman
2020-03-07 1:03 ` Eric W. Biederman
2020-03-08 12:58 ` [PATCH] exec: make de_thread alloc new signal struct earlier Bernd Edlinger
2020-03-08 18:12 ` Eric W. Biederman
2020-03-05 22:31 ` [PATCH 0/2] Infrastructure to allow fixing exec deadlocks Bernd Edlinger
2020-03-06 5:06 ` Eric W. Biederman
2020-03-08 21:34 ` [PATCH 0/5] " Eric W. Biederman
2020-03-08 21:35 ` [PATCH v2 1/5] exec: Only compute current once in flush_old_exec Eric W. Biederman
2020-03-09 13:56 ` Bernd Edlinger
2020-03-09 17:34 ` Eric W. Biederman
2020-03-09 17:56 ` Bernd Edlinger
2020-03-09 19:27 ` Bernd Edlinger
2020-03-10 20:17 ` Kees Cook
2020-03-10 21:12 ` Christian Brauner
2020-03-08 21:36 ` [PATCH v2 2/5] exec: Factor unshare_sighand out of de_thread and call it separately Eric W. Biederman
2020-03-09 19:28 ` Bernd Edlinger
2020-03-10 20:29 ` Kees Cook
2020-03-10 20:34 ` Bernd Edlinger
2020-03-10 20:57 ` Kees Cook
2020-03-10 21:21 ` Christian Brauner
2020-03-08 21:36 ` [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread Eric W. Biederman
2020-03-09 19:30 ` Bernd Edlinger
2020-03-09 19:59 ` Christian Brauner
2020-03-09 20:06 ` Eric W. Biederman
2020-03-09 20:17 ` Christian Brauner
2020-03-09 20:48 ` Eric W. Biederman
2020-03-10 8:55 ` Christian Brauner
2020-03-10 18:52 ` [PATCH] pidfd: Stop taking cred_guard_mutex Eric W. Biederman
2020-03-10 19:15 ` Christian Brauner
2020-03-10 19:16 ` Jann Horn
2020-03-10 19:27 ` Eric W. Biederman
2020-03-10 20:00 ` Jann Horn
2020-03-10 20:10 ` Jann Horn
2020-03-10 20:22 ` Bernd Edlinger
2020-03-11 6:11 ` Bernd Edlinger
2020-03-11 14:56 ` Jann Horn
2020-03-10 20:57 ` Eric W. Biederman
2020-03-10 21:29 ` Christian Brauner
2020-03-11 18:49 ` Kees Cook
2020-03-14 9:12 ` [PATCH] pidfd: Use new infrastructure to fix deadlocks in execve Bernd Edlinger
2020-03-10 20:16 ` [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread Kees Cook
2020-03-10 20:31 ` Kees Cook
2020-03-10 20:57 ` Jann Horn
2020-03-10 21:05 ` Eric W. Biederman
2020-03-10 21:22 ` Christian Brauner
2020-03-08 21:38 ` [PATCH v2 4/5] exec: Move exec_mmap right after de_thread in flush_old_exec Eric W. Biederman
2020-03-09 19:34 ` Bernd Edlinger
2020-03-09 19:45 ` Eric W. Biederman
2020-03-09 19:52 ` Bernd Edlinger
2020-03-09 19:58 ` Eric W. Biederman
2020-03-09 20:03 ` Bernd Edlinger
2020-03-09 20:35 ` Eric W. Biederman
2020-03-10 20:44 ` Kees Cook
2020-03-10 21:20 ` Eric W. Biederman
2020-03-10 20:47 ` Kees Cook
2020-03-10 21:09 ` Eric W. Biederman
2020-03-08 21:38 ` [PATCH v2 5/5] exec: Add a exec_update_mutex to replace cred_guard_mutex Eric W. Biederman
2020-03-09 13:45 ` Bernd Edlinger
2020-03-09 17:40 ` Eric W. Biederman
2020-03-09 18:01 ` Bernd Edlinger
2020-03-09 18:10 ` Eric W. Biederman
2020-03-09 18:24 ` Eric W. Biederman
2020-03-09 18:36 ` Eric W. Biederman
2020-03-09 18:47 ` Bernd Edlinger
2020-03-09 19:02 ` Eric W. Biederman
2020-03-09 19:24 ` Bernd Edlinger
2020-03-09 19:35 ` Eric W. Biederman
2020-03-09 19:39 ` Eric W. Biederman
2020-03-10 13:43 ` [PATCH 0/4] Use new infrastructure to fix deadlocks in execve Bernd Edlinger
2020-03-10 15:35 ` Eric W. Biederman
2020-03-10 17:44 ` [PATCH 0/4] Use new infrastructure in more simple cases Bernd Edlinger
2020-03-10 17:45 ` [PATCH 1/4] kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve Bernd Edlinger
2020-03-10 19:01 ` Eric W. Biederman
2020-03-10 19:42 ` Bernd Edlinger
2020-03-10 17:45 ` [PATCH 2/4] proc: " Bernd Edlinger
2020-03-11 18:59 ` Kees Cook
2020-03-11 19:10 ` Kees Cook
2020-03-11 19:38 ` Bernd Edlinger
2020-03-10 17:45 ` [PATCH 3/4] proc: io_accounting: " Bernd Edlinger
2020-03-10 19:06 ` Eric W. Biederman
2020-03-10 20:19 ` Bernd Edlinger
2020-03-10 21:25 ` Eric W. Biederman
2020-03-11 19:08 ` Kees Cook
2020-03-11 19:48 ` Bernd Edlinger
2020-03-11 19:48 ` Eric W. Biederman
2020-03-10 17:45 ` [PATCH 4/4] perf: " Bernd Edlinger
2020-03-10 13:43 ` [PATCH 1/4] exec: Fix a deadlock in ptrace Bernd Edlinger
2020-03-10 15:13 ` Eric W. Biederman
2020-03-10 15:17 ` Bernd Edlinger
2020-03-10 21:00 ` Kees Cook
2020-03-10 13:44 ` [PATCH 2/4] selftests/ptrace: add test cases for dead-locks Bernd Edlinger
2020-03-10 21:36 ` Kees Cook
2020-03-10 22:41 ` Dmitry V. Levin
2020-03-10 13:44 ` [PATCH 3/4] mm: docs: Fix a comment in process_vm_rw_core Bernd Edlinger
2020-03-11 18:53 ` Kees Cook
2020-03-10 13:44 ` [PATCH 4/4] kernel: doc: remove outdated comment cred.c Bernd Edlinger
2020-03-11 18:54 ` Kees Cook
2020-03-09 19:33 ` [PATCH v2 5/5] exec: Add a exec_update_mutex to replace cred_guard_mutex Dmitry V. Levin
2020-03-09 19:42 ` Eric W. Biederman
2020-03-10 20:55 ` Kees Cook
2020-03-10 21:02 ` Eric W. Biederman
2020-03-10 21:21 ` Jann Horn
2020-03-10 21:30 ` Eric W. Biederman
2020-03-10 23:21 ` Jann Horn
2020-03-11 0:15 ` Eric W. Biederman
2020-03-11 6:33 ` Bernd Edlinger
2020-03-11 16:29 ` Eric W. Biederman
2020-03-11 13:18 ` Qian Cai
2020-03-12 10:27 ` Kirill Tkhai
2020-03-12 12:24 ` Eric W. Biederman
2020-03-12 13:45 ` Kirill Tkhai
2020-03-12 14:38 ` Eric W. Biederman
2020-03-12 15:23 ` Kirill Tkhai
2020-03-13 1:05 ` Bernd Edlinger
2020-03-13 9:13 ` Kirill Tkhai
2020-03-14 9:11 ` [PATCH v3 " Bernd Edlinger
2020-03-17 8:56 ` Kirill Tkhai
2020-03-17 21:53 ` Bernd Edlinger
2020-03-18 12:22 ` Kirill Tkhai
2020-03-18 20:06 ` Bernd Edlinger [this message]
2020-03-19 7:13 ` Kirill Tkhai
2020-03-19 7:19 ` Bernd Edlinger
2020-03-19 9:11 ` [PATCH v4 3/5] " Bernd Edlinger
2020-03-19 9:13 ` Bernd Edlinger
2020-03-19 9:19 ` Greg Kroah-Hartman
2020-03-19 9:20 ` Bernd Edlinger
2020-03-21 22:53 ` Bernd Edlinger
2020-03-14 9:12 ` [PATCH 0/2] exec: Fix dead-lock in de_thread with ptrace_attach Bernd Edlinger
2020-03-14 9:12 ` [PATCH 1/2] " Bernd Edlinger
2020-03-14 9:13 ` [PATCH 2/2] doc: Update documentation of ->exec_*_mutex Bernd Edlinger
2020-03-14 9:57 ` [PATCH v2 5/5] exec: Add a exec_update_mutex to replace cred_guard_mutex Bernd Edlinger
2020-03-14 10:02 ` Bernd Edlinger
2020-03-17 8:58 ` Kirill Tkhai
2020-03-09 13:58 ` [PATCH 0/5] Infrastructure to allow fixing exec deadlocks Bernd Edlinger
2020-03-03 16:50 ` [PATCHv5] exec: Fix a deadlock in ptrace Christian Brauner
2020-03-02 12:28 ` [PATCHv2] " Oleg Nesterov
2020-03-02 15:56 ` Bernd Edlinger
2020-03-02 7:47 ` [PATCH] " Christian Brauner
2020-03-02 7:48 ` Christian Brauner
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