From: Petr Mladek <pmladek@suse.com>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
Ondrej Mosnacek <omosnace@redhat.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH v2] twist: allow converting pr_devel()/pr_debug() into snprintf()
Date: Thu, 28 May 2020 13:06:46 +0200 [thread overview]
Message-ID: <20200528110646.GC11286@linux-b0ei> (raw)
In-Reply-To: <20200528065603.3596-1-penguin-kernel@I-love.SAKURA.ne.jp>
On Thu 2020-05-28 15:56:03, Tetsuo Handa wrote:
> syzbot found a NULL pointer dereference bug inside mptcp_recvmsg() due to
> ssock == NULL, but this bug manifested inside selinux_socket_recvmsg()
> because pr_debug() was no-op [1].
>
> pr_debug("fallback-read subflow=%p",
> mptcp_subflow_ctx(ssock->sk));
> copied = sock_recvmsg(ssock, msg, flags);
>
> Thus, let's allow fuzzers to always evaluate pr_devel()/pr_debug()
> messages, by redirecting no-op pr_devel()/pr_debug() calls to snprintf().
>
> [1] https://syzkaller.appspot.com/bug?id=12be9aa373be9d8727cdd172f190de39528a413a
>
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Ondrej Mosnacek <omosnace@redhat.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> ---
> include/linux/dev_printk.h | 16 ++++++++++++++++
> include/linux/dynamic_debug.h | 14 ++++++++++++--
> include/linux/printk.h | 10 ++++++++++
> lib/Kconfig.twist | 12 ++++++++++++
> 4 files changed, 50 insertions(+), 2 deletions(-)
I am fine with pushing this into linux-next for testing purposes.
But I am against pushing this to Linus' tree in this form.
Now, it requires lib/Kconfig.twist that is added by a patch in
Andrew's tree. One approach is to push this into linux-next
via Andrew's -mm tree.
Another possibility would be to remove lib/Kconfig.twist
changes from this patch and replace
CONFIG_TWIST_ALWAYS_EVALUATE_PRINTK_ARGUMENTS with
CONFIG_TWIST_FOR_SYZKALLER_TESTING.
Then I could push it into linux-next via printk/linux.git tree.
Best Regards,
Petr
next prev parent reply other threads:[~2020-05-28 11:06 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-24 14:50 [PATCH] twist: allow converting pr_devel()/pr_debug() into printk(KERN_DEBUG) Tetsuo Handa
2020-05-24 17:38 ` Joe Perches
2020-05-24 19:18 ` Ondrej Mosnacek
2020-05-25 5:03 ` Tetsuo Handa
2020-05-25 6:07 ` Joe Perches
2020-05-25 7:38 ` Dmitry Vyukov
2020-05-25 8:42 ` Petr Mladek
2020-05-25 9:11 ` Sergey Senozhatsky
2020-05-25 10:43 ` Tetsuo Handa
2020-05-27 8:37 ` Petr Mladek
2020-05-27 10:13 ` Tetsuo Handa
2020-05-27 15:55 ` Petr Mladek
2020-05-27 23:33 ` Tetsuo Handa
2020-05-28 6:56 ` [PATCH v2] twist: allow converting pr_devel()/pr_debug() into snprintf() Tetsuo Handa
2020-05-28 11:06 ` Petr Mladek [this message]
2020-05-28 15:16 ` Tetsuo Handa
2020-05-28 19:10 ` Andrew Morton
2020-05-28 19:50 ` Linus Torvalds
2020-05-28 20:01 ` Linus Torvalds
2020-05-29 0:07 ` Tetsuo Handa
2020-05-29 0:28 ` Linus Torvalds
2020-05-29 2:13 ` Tetsuo Handa
2020-05-29 2:24 ` Linus Torvalds
2020-05-29 4:47 ` Tetsuo Handa
2020-05-29 13:26 ` Tetsuo Handa
2020-06-03 11:03 ` twist: allow disabling reboot request Tetsuo Handa
2020-06-03 12:44 ` Petr Mladek
2020-06-03 13:35 ` Tetsuo Handa
2020-06-04 10:21 ` Petr Mladek
2020-06-08 7:48 ` [PATCH v2] twist: allow converting pr_devel()/pr_debug() into snprintf() Dmitry Vyukov
2020-06-08 10:30 ` Tetsuo Handa
2020-06-08 11:31 ` Andrey Konovalov
2020-05-29 8:17 ` Petr Mladek
2020-06-08 16:39 ` Geert Uytterhoeven
2020-05-28 10:59 ` [PATCH] twist: allow converting pr_devel()/pr_debug() into printk(KERN_DEBUG) Petr Mladek
2020-05-28 11:33 ` Tetsuo Handa
2020-05-28 12:14 ` Petr Mladek
2020-05-28 14:13 ` Tetsuo Handa
2020-05-28 17:08 ` Joe Perches
2020-05-29 2:04 ` Sergey Senozhatsky
2020-05-29 5:06 ` Tetsuo Handa
2020-05-27 9:59 ` kbuild test robot
2020-05-27 13:41 ` Tetsuo Handa
2020-05-27 12:37 ` kbuild test robot
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