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[35.204.162.40]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e4c43a55besm8891211a12.72.2025.03.04.18.17.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 18:17:20 -0800 (PST) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@Oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.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, Jeff Xu , Kees Cook Subject: [PATCH v9 1/7] mseal sysmap: kernel config and header change Date: Wed, 5 Mar 2025 02:17:05 +0000 Message-ID: <20250305021711.3867874-2-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250305021711.3867874-1-jeffxu@google.com> References: <20250305021711.3867874-1-jeffxu@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 815752000A X-Rspamd-Server: rspam09 X-Stat-Signature: jyggbj7h8cueotia3wridy1qh8ounify X-HE-Tag: 1741141042-895954 X-HE-Meta: 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 i1+m2pvv GEq1CW6KmMITEHARxuUwvWMY4HWjWZy7jqca9Cr/Oj55OE17Lv5x/9gj7WvCxlyulmWOPuontattdzV2cq+9lohhquNsZE/ixzhqFaVR1uPAf2JAgQva8zre42F32ctIjshjjgjR2DShH/3nfwkhmQqvoy6bJmUdoV0lgXaCU6iH1b9eb7F8WVGtqZK68x0yPmgmH7kec5HWbi9XoRx7ZLOxeWFRiZ1aaoV+Zy3PJuzJbuctwCs1CP2U+yxo6AsmD5b1xMwPIHj6F3qnuKnhP3MzIuQLX9vbTEPCeP5+ot4KvuG6uYLnC6QGdQwZTRVIrPVra/d3Z5u1JGgKu1vd5KxiaI5nLcoMZCv1oZUJth7WVmnninHTbw3gvudB6unqrjT1K 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: From: Jeff Xu Provide infrastructure to mseal system mappings. Establish two kernel configs (CONFIG_MSEAL_SYSTEM_MAPPINGS, ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS) and VM_SEALED_SYSMAP macro for future patches. Signed-off-by: Jeff Xu Reviewed-by: Kees Cook --- include/linux/mm.h | 10 ++++++++++ init/Kconfig | 22 ++++++++++++++++++++++ security/Kconfig | 21 +++++++++++++++++++++ 3 files changed, 53 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 7b1068ddcbb7..8b800941678d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4155,4 +4155,14 @@ int arch_get_shadow_stack_status(struct task_struct *t, unsigned long __user *st int arch_set_shadow_stack_status(struct task_struct *t, unsigned long status); int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status); + +/* + * mseal of userspace process's system mappings. + */ +#ifdef CONFIG_MSEAL_SYSTEM_MAPPINGS +#define VM_SEALED_SYSMAP VM_SEALED +#else +#define VM_SEALED_SYSMAP VM_NONE +#endif + #endif /* _LINUX_MM_H */ diff --git a/init/Kconfig b/init/Kconfig index d0d021b3fa3b..7f67d8942a09 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1882,6 +1882,28 @@ config ARCH_HAS_MEMBARRIER_CALLBACKS config ARCH_HAS_MEMBARRIER_SYNC_CORE bool +config ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS + bool + help + Control MSEAL_SYSTEM_MAPPINGS access based on architecture. + + A 64-bit kernel is required for the memory sealing feature. + No specific hardware features from the CPU are needed. + + To enable this feature, the architecture needs to update their + special mappings calls to include the sealing flag and confirm + that it doesn't unmap/remap system mappings during the life + time of the process. The existence of this flag for an architecture + implies that it does not require the remapping of the system + mappings during process lifetime, so sealing these mappings is safe + from a kernel perspective. + + After the architecture enables this, a distribution can set + CONFIG_MSEAL_SYSTEM_MAPPING to manage access to the feature. + + For complete descriptions of memory sealing, please see + Documentation/userspace-api/mseal.rst + config HAVE_PERF_EVENTS bool help diff --git a/security/Kconfig b/security/Kconfig index f10dbf15c294..a914a02df27e 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -51,6 +51,27 @@ config PROC_MEM_NO_FORCE endchoice +config MSEAL_SYSTEM_MAPPINGS + bool "mseal system mappings" + depends on 64BIT + depends on ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS + depends on !CHECKPOINT_RESTORE + help + Apply mseal on system mappings. + The system mappings includes vdso, vvar, vvar_vclock, + vectors (arm compat-mode), sigpage (arm compat-mode), uprobes. + + A 64-bit kernel is required for the memory sealing feature. + No specific hardware features from the CPU are needed. + + WARNING: This feature breaks programs which rely on relocating + or unmapping system mappings. Known broken software at the time + of writing includes CHECKPOINT_RESTORE, UML, gVisor, rr. Therefore + this config can't be enabled universally. + + For complete descriptions of memory sealing, please see + Documentation/userspace-api/mseal.rst + config SECURITY bool "Enable different security models" depends on SYSFS -- 2.48.1.711.g2feabab25a-goog