From: jeffxu@chromium.org
To: skhan@linuxfoundation.org, keescook@chromium.org
Cc: akpm@linux-foundation.org, dmitry.torokhov@gmail.com,
dverkamp@chromium.org, asmadeus@codewreck.org, hughd@google.com,
jeffxu@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,
linux-security-module@vger.kernel.org
Subject: [PATCH v2 0/2] mm/memfd: fix sysctl MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED
Date: Wed, 5 Jul 2023 06:33:13 +0000 [thread overview]
Message-ID: <20230705063315.3680666-1-jeffxu@google.com> (raw)
From: Jeff Xu <jeffxu@google.com>
When sysctl vm.memfd_noexec is 2 (MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED),
memfd_create(.., MFD_EXEC) should fail.
This complies with how MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED is
defined - "memfd_create() without MFD_NOEXEC_SEAL will be rejected"
Thanks to Dominique Martinet <asmadeus@codewreck.org> who reported the bug.
see [1] for context.
[1] https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/
History:
V2: fix build error when CONFIG_SYSCTL is not defined.
V1: initial version
https://lore.kernel.org/linux-mm/20230630031721.623955-3-jeffxu@google.com/T/
Jeff Xu (2):
mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED
selftests/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED
mm/memfd.c | 57 +++++++++++++---------
tools/testing/selftests/memfd/memfd_test.c | 5 ++
2 files changed, 38 insertions(+), 24 deletions(-)
--
2.41.0.255.g8b1d071c50-goog
next reply other threads:[~2023-07-05 6:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-05 6:33 jeffxu [this message]
2023-07-05 6:33 ` [PATCH v2 1/2] mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED jeffxu
2023-07-05 6:33 ` [PATCH v2 2/2] selftests/memfd: " jeffxu
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