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Tue, 14 Jan 2025 15:56:54 -0800 (PST) MIME-Version: 1.0 References: <20241206010930.3871336-1-isaacmanjarres@google.com> <20241206010930.3871336-2-isaacmanjarres@google.com> <0ff1c9d9-85f0-489e-a3f7-fa4cef5bb7e5@lucifer.local> <202501061643.986D9453@keescook> <202501141326.E81023D@keescook> In-Reply-To: From: Jeff Xu Date: Tue, 14 Jan 2025 15:56:42 -0800 X-Gm-Features: AbW1kvYVUAP5xVIsnmRsQIsr2TbfB3Xp5ZrZuZOEIpJoQq_ZV6Ao_Nj-QrGDqBs Message-ID: Subject: Re: [RFC PATCH v1 1/2] mm/memfd: Add support for F_SEAL_FUTURE_EXEC to memfd To: Isaac Manjarres Cc: Kees Cook , Lorenzo Stoakes , Jann Horn , Andrew Morton , Jeff Layton , Chuck Lever , Alexander Aring , "Liam R. Howlett" , Vlastimil Babka , Shuah Khan , kernel-team@android.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, Suren Baghdasaryan , Kalesh Singh , John Stultz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: E8186A0011 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: rm8honktumk9wgragrhigotpf5kgqizp X-HE-Tag: 1736899014-42903 X-HE-Meta: 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 JW33UImI OPQtGJxHy0sEdhADzDT0SUX7CY+JUWobDpYrSZ0MnHehoZtER5ClWQlTgnmUANjDjkdC4qUKbIri0sKtChs5i5mHA+TGQzbstTCxdxLUHwKdV6ByxrgTMukfCBsAoH1JXPJdHQ7Vtci9Qi2z8zMmModd2DeyWNotOLnh/VVOAt++PuuzgV81yw2iX1FQbCDnKSzVYbU8kUVxN+WBJPTcdFFwfKqbHXo1ySBA0V3J8lLtznHS0ybpM3nQzMZ6nc2+08OjnKf8vw+v9urIMDeR2YTaiACacVtaqNHXJiq5M25QOioQV/BeBL6i/M46g2AwOvYgknqsi+ZmjhThAgXjAJUJK7huoSMMWsWA+IRKRXUvcrqk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.183732, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jan 14, 2025 at 3:41=E2=80=AFPM Jeff Xu wrote= : > > On Tue, Jan 14, 2025 at 2:42=E2=80=AFPM Isaac Manjarres > wrote: > > > > On Tue, Jan 14, 2025 at 01:29:44PM -0800, Kees Cook wrote: > > > On Tue, Jan 14, 2025 at 12:02:28PM -0800, Isaac Manjarres wrote: > > > Alternatively, MFD_NOEXEC_SEAL could be extended > > to prevent executable mappings, and MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED > > could be enabled, but that type of system would prevent memfd buffers > > from being used for execution for legitimate usecases (e.g. JIT), which > > may not be desirable. > > > The JIT case doesn't use execve(memfd), right ? > That might not be important. I also think selinux policy will be a better option for this, There is a pending work item to restrict/enforce MFD_NOEXEC_SEAL on memfd_create(). > > > > --Isaac