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Mon, 24 Feb 2025 13:55:06 -0800 (PST) MIME-Version: 1.0 References: <20250224174513.3600914-1-jeffxu@google.com> <20250224174513.3600914-8-jeffxu@google.com> In-Reply-To: From: Jeff Xu Date: Mon, 24 Feb 2025 13:54:56 -0800 X-Gm-Features: AWEUYZlWnyV6Jdfb2-SNecn18hyqiYaIseEaup8aJSHrCsv9Z2O_gnjBeFaB_Sg Message-ID: Subject: Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst To: "Liam R. Howlett" , jeffxu@chromium.org, akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de, adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 94CC540006 X-Stat-Signature: 196fcfw7swt63qopom9r9k3zteyezrqq X-HE-Tag: 1740434107-208352 X-HE-Meta: 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 UHer97sJ wB2jBHYATorwifPnizsyfbp6KOvLfuNvkLhi9kitwk0BvJo8aUrATkzfH0HC0b8qYuOfoi+ULVS8oqZr4N278Q/TvUjygVjrSZEZLHnyNP+HUJVdhCjfI/TUU1qkQ4QPZUDibuDLuLBlzX1PIg6X+Yhm3myAchiJKKyI/LyW6X6fpICY2j9WSuohxJpUxV12dgwrhbfJNvDjai+LOFQ+JG2CS8uZrvqakHfraxKfBPZfNbfxkn+ooQgnt3BoK2Sx7BZzlFYQ25Ob10uFMKgKx9wa15WWeeHVNnliAzQ5zOVTkNmptShpBinBiXZiRp6zqUOVn X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 Mon, Feb 24, 2025 at 1:06=E2=80=AFPM Jeff Xu wrote= : > > On Mon, Feb 24, 2025 at 12:26=E2=80=AFPM Liam R. Howlett > wrote: > > > > * jeffxu@chromium.org [250224 12:45]: > > > From: Jeff Xu > > > > > > Update memory sealing documentation to include details about system > > > mappings. > > > > > > Signed-off-by: Jeff Xu > > > --- > > > Documentation/userspace-api/mseal.rst | 7 +++++++ > > > 1 file changed, 7 insertions(+) > > > > > > diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/us= erspace-api/mseal.rst > > > index 41102f74c5e2..10147281bf2d 100644 > > > --- a/Documentation/userspace-api/mseal.rst > > > +++ b/Documentation/userspace-api/mseal.rst > > > @@ -130,6 +130,13 @@ Use cases > > > > > > - Chrome browser: protect some security sensitive data structures. > > > > Did you mean to drop this line? > > > Ah, thank you for catching that. > Actually, this isn't a problem here. The "-" here is part of the text, for list, so that line is not dropped). -Jeff > -Jeff > > > > > > > > +- System mappings: > > > + If supported by an architecture (via CONFIG_ARCH_HAS_MSEAL_SYSTEM_= MAPPINGS), > > > + the CONFIG_MSEAL_SYSTEM_MAPPINGS seals system mappings, e.g. vdso,= vvar, > > > + uprobes, sigpage, vectors, etc. CHECKPOINT_RESTORE, UML, gVisor, r= r are > > > + known to relocate or unmap system mapping, therefore this config c= an't be > > > + enabled universally. > > > + > > > When not to use mseal > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > Applications can apply sealing to any virtual memory region from use= rspace, > > > -- > > > 2.48.1.601.g30ceb7b040-goog > > >