From: Andrew Morton <akpm@linux-foundation.org>
To: Jeff Xu <jeffxu@google.com>
Cc: Kees Cook <keescook@chromium.org>, Peter Xu <peterx@redhat.com>,
jeffxu@chromium.org, skhan@linuxfoundation.org,
dmitry.torokhov@gmail.com, dverkamp@chromium.org,
hughd@google.com, jorgelo@chromium.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-mm@kvack.org, jannh@google.com,
linux-hardening@vger.kernel.org,
kernel test robot <lkp@intel.com>
Subject: Re: [PATCH v6 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC
Date: Fri, 16 Dec 2022 14:06:41 -0800 [thread overview]
Message-ID: <20221216140641.bf6e47b7c4f5a53f34c8cf9a@linux-foundation.org> (raw)
In-Reply-To: <CALmYWFuENPRvCAOF6of=Ufct5jjAbJ=iDyH7eODhdbm24uAK3Q@mail.gmail.com>
On Fri, 16 Dec 2022 13:46:58 -0800 Jeff Xu <jeffxu@google.com> wrote:
> On Fri, Dec 16, 2022 at 12:35 PM Kees Cook <keescook@chromium.org> wrote:
> >
> > On Fri, Dec 16, 2022 at 10:11:44AM -0800, Jeff Xu wrote:
> > > Once per boot seems too little, it would be nice if we can list all processes.
> > > I agree ratelimited might be too much.
> > > There is a feature gap here for logging.
> > >
> > > Kees, what do you think ?
> >
> > I agree once per boot is kind of frustrating "I fixed the one warning,
> > oh, now it's coming from a different process". But ratelimit is, in
> > retrospect, still too often.
> >
> > Let's go with per boot -- this should be noisy "enough" to get the
> > changes in API into the callers without being too much of a hassle.
> >
> Agreed. Let's go with per boot.
>
> Hi Andrew, what is your preference ? I can send a patch or you
> directly fix it in mm-unstable ?
Like this?
--- a/mm/memfd.c~mm-memfd-add-mfd_noexec_seal-and-mfd_exec-fix-3
+++ a/mm/memfd.c
@@ -308,7 +308,7 @@ SYSCALL_DEFINE2(memfd_create,
flags |= MFD_NOEXEC_SEAL;
break;
default:
- pr_warn_ratelimited(
+ pr_warn_once(
"memfd_create(): MFD_NOEXEC_SEAL is enforced, pid=%d '%s'\n",
task_pid_nr(current), get_task_comm(comm, current));
return -EINVAL;
@@ -316,7 +316,7 @@ SYSCALL_DEFINE2(memfd_create,
#else
flags |= MFD_EXEC;
#endif
- pr_warn_ratelimited(
+ pr_warn_once(
"memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=%d '%s'\n",
task_pid_nr(current), get_task_comm(comm, current));
}
_
next prev parent reply other threads:[~2022-12-16 22:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20221207154939.2532830-1-jeffxu@google.com>
2022-12-08 16:13 ` [PATCH v6 0/6] mm/memfd: introduce " Kees Cook
2022-12-08 18:33 ` Jeff Xu
2022-12-08 20:55 ` Kees Cook
[not found] ` <20221207154939.2532830-2-jeffxu@google.com>
2022-12-08 16:16 ` [PATCH v6 1/6] mm/memfd: add F_SEAL_EXEC Kees Cook
[not found] ` <20221207154939.2532830-3-jeffxu@google.com>
2022-12-08 16:21 ` [PATCH v6 2/6] selftests/memfd: add tests for F_SEAL_EXEC Kees Cook
[not found] ` <20221207154939.2532830-4-jeffxu@google.com>
2022-12-08 16:27 ` [PATCH v6 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC Kees Cook
2022-12-08 22:55 ` Jeff Xu
2022-12-16 15:46 ` Peter Xu
2022-12-16 17:15 ` Jeff Xu
2022-12-16 17:42 ` Andrew Morton
2022-12-16 18:11 ` Jeff Xu
2022-12-16 20:35 ` Kees Cook
2022-12-16 21:46 ` Jeff Xu
2022-12-16 22:06 ` Andrew Morton [this message]
2022-12-16 23:40 ` Jeff Xu
2022-12-20 16:55 ` Shuah Khan
2022-12-23 18:06 ` Jeff Xu
[not found] ` <20221207154939.2532830-5-jeffxu@google.com>
2022-12-08 16:27 ` [PATCH v6 4/6] mm/memfd: Add write seals when apply SEAL_EXEC to executable memfd Kees Cook
[not found] ` <20221207154939.2532830-6-jeffxu@google.com>
2022-12-08 16:30 ` [PATCH v6 5/6] selftests/memfd: add tests for MFD_NOEXEC_SEAL MFD_EXEC Kees Cook
[not found] ` <20221207154939.2532830-7-jeffxu@google.com>
2022-12-08 16:32 ` [PATCH v6 6/6] mm/memfd: security hook for memfd_create Kees Cook
2022-12-08 16:46 ` Kees Cook
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