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Howlett" To: jeffxu@chromium.org Cc: 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 Subject: Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst Message-ID: Mail-Followup-To: "Liam R. 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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/userspace-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? > > +- 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, rr are > + known to relocate or unmap system mapping, therefore this config can't be > + enabled universally. > + > When not to use mseal > ===================== > Applications can apply sealing to any virtual memory region from userspace, > -- > 2.48.1.601.g30ceb7b040-goog >