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[35.204.162.40]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e4c3fb6067sm6248635a12.50.2025.03.02.21.09.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Mar 2025 21:09:28 -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 Subject: [PATCH v8 1/7] mseal sysmap: kernel config and header change Date: Mon, 3 Mar 2025 05:09:15 +0000 Message-ID: <20250303050921.3033083-2-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250303050921.3033083-1-jeffxu@google.com> References: <20250303050921.3033083-1-jeffxu@google.com> MIME-Version: 1.0 X-Rspam-User: X-Stat-Signature: 5zoq4yezyt6sym3n4d6gxnzdxeb6de7s X-Rspamd-Queue-Id: 81D24140002 X-Rspamd-Server: rspam07 X-HE-Tag: 1740978571-962606 X-HE-Meta: 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 7epyzWJM PajgFeG6tpsTQ4fGl9UdmF7dBRuyPzO858nLW/kQPZ+wo8+DXcyb5JUKFo5xrYqS8t/I7Jlzc/uuAfWVxEhsxSbOponDwSMydnXWusTuVRQ7Y1w7Oww0i4jqYrI0Wut4CXhRLNFMC0Bmiml0XoPvsNjWpUjU0X5BMMZswmD8FBKPotfAlj8lju9HOFEV7epxrOrGjwBa0sUklsD3tS1FXb3DYEoP589lNrBDLnmiXbpW1a1UZV9cMJTwa67X45FCpoyakFxWURsr0TYYGA41joYNEokHa4+ylHdN8Sv22YmawTWdc+HmIw1hp2ieitlbHjOZMdr1nV83VX4z+DyBfeMCvO81iD4POxj6YAhQ14bXvTTc= 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: Lorenzo Stoakes Reviewed-by: Liam R. Howlett 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..c90dd8778993 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 thest 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..5311f4a6786c 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 compact-mode), sigpage (arm compact-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