From: Mike Rapoport <rppt@kernel.org>
To: James Bottomley <jejb@linux.ibm.com>
Cc: Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Borislav Petkov <bp@alien8.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Christopher Lameter <cl@linux.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
Elena Reshetova <elena.reshetova@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Matthew Wilcox <willy@infradead.org>,
Matthew Garrett <mjg59@srcf.ucam.org>,
Mark Rutland <mark.rutland@arm.com>,
Michal Hocko <mhocko@suse.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org
Subject: Re: [PATCH v18 0/9] mm: introduce memfd_secret system call to create "secret" memory areas
Date: Mon, 10 May 2021 21:02:21 +0300 [thread overview]
Message-ID: <YJl1LQvQuxxfGRnJ@kernel.org> (raw)
In-Reply-To: <9e1953a1412fad06a9f7988a280d2d9a74ab0464.camel@linux.ibm.com>
On Thu, May 06, 2021 at 11:47:47AM -0700, James Bottomley wrote:
> On Thu, 2021-05-06 at 10:33 -0700, Kees Cook wrote:
> > On Thu, May 06, 2021 at 08:26:41AM -0700, James Bottomley wrote:
>
> > What's happening with O_CLOEXEC in this code? I don't see that
> > mentioned in the cover letter either. Why is it disallowed? That
> > seems a strange limitation for something trying to avoid leaking
> > secrets into other processes.
>
> I actually thought we forced it, so I'll let Mike address this. I
> think allowing it is great, so the secret memory isn't inherited by
> children, but I can see use cases where a process would want its child
> to inherit the secrets.
We do not enforce O_CLOEXEC, but if the user explicitly requested O_CLOEXEC
it would be passed to get_unused_fd_flags().
--
Sincerely yours,
Mike.
prev parent reply other threads:[~2021-05-10 18:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-03 16:22 [PATCH v18 0/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 1/9] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 2/9] mmap: make mlock_future_check() global Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 3/9] riscv/Kconfig: make direct map manipulation options depend on MMU Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 4/9] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 5/9] set_memory: allow querying whether set_direct_map_*() is actually enabled Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 6/9] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 7/9] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 8/9] arch, mm: wire up memfd_secret system call where relevant Mike Rapoport
2021-03-03 16:22 ` [PATCH v18 9/9] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
2021-05-05 19:08 ` [PATCH v18 0/9] mm: introduce memfd_secret system call to create "secret" memory areas Andrew Morton
2021-05-06 15:26 ` James Bottomley
2021-05-06 16:45 ` David Hildenbrand
2021-05-06 17:05 ` James Bottomley
2021-05-06 17:24 ` David Hildenbrand
2021-05-06 23:16 ` Nick Kossifidis
2021-05-07 7:35 ` David Hildenbrand
2021-05-06 17:33 ` Kees Cook
2021-05-06 18:47 ` James Bottomley
2021-05-07 23:57 ` Kees Cook
2021-05-10 18:02 ` Mike Rapoport [this message]
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