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Mon, 07 Oct 2024 08:00:05 -0700 (PDT) MIME-Version: 1.0 References: <20241004163155.3493183-1-jeffxu@google.com> <20241004163155.3493183-2-jeffxu@google.com> <20241005202025.GB24353@redhat.com> In-Reply-To: <20241005202025.GB24353@redhat.com> From: Jeff Xu Date: Mon, 7 Oct 2024 08:00:00 -0700 Message-ID: Subject: Re: [RFC PATCH v1 1/1] exec: seal system mappings To: Oleg Nesterov Cc: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, adhemerval.zanella@linaro.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, ojeda@kernel.org, adobriyan@gmail.com, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, mike.kravetz@oracle.com, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, hch@lst.de, peterx@redhat.com, hca@linux.ibm.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, nathan_lynch@mentor.com, dsafonov@virtuozzo.com, Liam.Howlett@oracle.com, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, lorenzo.stoakes@oracle.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A342F80021 X-Stat-Signature: wbnhyjgrgrqjhi7jodct1x3387wcyxjq X-Rspam-User: X-HE-Tag: 1728313206-173742 X-HE-Meta: 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 546MAoz0 dMiNjCXGBljXLbvnjaPDnpQrHoWSlFYVVIUcK+Et1N8HMu1KOn2s6bii6oXKka+ay3qbZQJKMhgHJUCXGNsE/k3k73XoLnOQjHiDYKulFlzwY0KspB+V6UV4L6veYoh5czqg2hFBy2vputm0uDHHcUbWiSHSk+r/JdQfy2cbWdyvtAq4O7gVp5niob2HbwCmtw1F4kq/gN/zp0hjCyj07KKmD5j+/qqiEGTUcV3gzPX5fNE2KI11yoFUERPyD/zvQApqJz3hgAJfycN069U2bvjpG7yR8v5OgnX2aZSKh10AG4M8rp7/jSx1RVy8uhBthlsuT X-Bogosity: Ham, tests=bogofilter, spamicity=0.006548, 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 Sat, Oct 5, 2024 at 1:21=E2=80=AFPM Oleg Nesterov wrot= e: > > Sorry for the noise, forgot to mention... > > On 10/04, jeffxu@chromium.org wrote: > > > > --- a/Documentation/admin-guide/kernel-parameters.txt > > +++ b/Documentation/admin-guide/kernel-parameters.txt > > @@ -1535,6 +1535,15 @@ > > Permit 'security.evm' to be updated regardless of > > current integrity status. > > > > + exec.seal_system_mappings =3D [KNL] > > + Format: { never | always } > > + Seal system mappings: vdso, vvar, sigpage, uprobe= s, > > + vsyscall. > > + This overwrites KCONFIG CONFIG_SEAL_SYSTEM_MAPPIN= GS_* > > + - 'never': never seal system mappings. > > + - 'always': always seal system mappings. > > + If not specified or invalid, default is the KCONF= IG value. > > perhaps the documentation should also mention that this new parameter has > no effect if CONFIG_64BIT=3Dn. Good point, I will add that. Thanks > > Oleg. >