linux-hardening - [PATCH v2 0/2] mm/memfd: fix sysctl MEMFD_NOEXEC_SCOPE_NOEXEC

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Message-ID: <20230705063315.3680666-1-jeffxu@google.com>
Date:   Wed,  5 Jul 2023 06:33:13 +0000
From:   jeffxu@...omium.org
To:     skhan@...uxfoundation.org, keescook@...omium.org
Cc:     akpm@...ux-foundation.org, dmitry.torokhov@...il.com,
        dverkamp@...omium.org, asmadeus@...ewreck.org, hughd@...gle.com,
        jeffxu@...gle.com, jorgelo@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, jannh@...gle.com,
        linux-hardening@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: [PATCH v2 0/2] mm/memfd: fix sysctl MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED

From: Jeff Xu <jeffxu@...gle.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@...ewreck.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