linux-kernel - Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAG48ez2aYfcwC7Sr6RseFk=PpvLAddcHsVsrTr_AS=jLvUu2KA@mail.gmail.com>
Date:   Tue, 10 Mar 2020 21:57:50 +0100
From:   Jann Horn <jannh@...gle.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Bernd Edlinger <bernd.edlinger@...mail.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yuyang Du <duyuyang@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Kellner <christian@...lner.me>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread

On Sun, Mar 8, 2020 at 10:39 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
> These functions have very little to do with de_thread move them out
> of de_thread an into flush_old_exec proper so it can be more clearly
> seen what flush_old_exec is doing.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  fs/exec.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/exec.c b/fs/exec.c
> index ff74b9a74d34..215d86f77b63 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1189,11 +1189,6 @@ static int de_thread(struct task_struct *tsk)
>         /* we have changed execution domain */
>         tsk->exit_signal = SIGCHLD;
>
> -#ifdef CONFIG_POSIX_TIMERS
> -       exit_itimers(sig);
> -       flush_itimer_signals();
> -#endif
> -
>         BUG_ON(!thread_group_leader(tsk));
>         return 0;
>
> @@ -1277,6 +1272,11 @@ int flush_old_exec(struct linux_binprm * bprm)
>         if (retval)
>                 goto out;
>
> +#ifdef CONFIG_POSIX_TIMERS
> +       exit_itimers(me->signal);
> +       flush_itimer_signals();
> +#endif

nit: exit_itimers() has a comment referring to de_thread, that should
probably be updated