linux-kernel - [PATCH mm-unstable 2/2] mseal sysmap: enable s390

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Message-ID: <20250311123326.2686682-3-hca@linux.ibm.com>
Date: Tue, 11 Mar 2025 13:33:26 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Jeff Xu <jeffxu@...omium.org>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Kees Cook <kees@...nel.org>,
        Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH mm-unstable 2/2] mseal sysmap: enable s390

Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on s390, covering the
vdso.

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/Kconfig       | 1 +
 arch/s390/kernel/vdso.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 608a965e2344..93b880992596 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -141,6 +141,7 @@ config S390
 	select ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	select ARCH_SUPPORTS_HUGETLBFS
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
+	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
 	select ARCH_SUPPORTS_NUMA_BALANCING
 	select ARCH_SUPPORTS_PER_VMA_LOCK
 	select ARCH_USE_BUILTIN_BSWAP
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 70c8f9ad13cd..430feb1a5013 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -80,7 +80,7 @@ static int map_vdso(unsigned long addr, unsigned long vdso_mapping_len)
 	vdso_text_start = vvar_start + VDSO_NR_PAGES * PAGE_SIZE;
 	/* VM_MAYWRITE for COW so gdb can set breakpoints */
 	vma = _install_special_mapping(mm, vdso_text_start, vdso_text_len,
-				       VM_READ|VM_EXEC|
+				       VM_READ|VM_EXEC|VM_SEALED_SYSMAP|
 				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 				       vdso_mapping);
 	if (IS_ERR(vma)) {
-- 
2.45.2