linux-kernel - [PATCH mm-unstable 1/2] mseal sysmap: generic vdso vvar mapping

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Message-ID: <20250311123326.2686682-2-hca@linux.ibm.com>
Date: Tue, 11 Mar 2025 13:33:25 +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 1/2] mseal sysmap: generic vdso vvar mapping

With the introduction of the generic vdso data storage the VM_SEALED_SYSMAP
vm flag must be moved from the architecture specific
_install_special_mapping() call [1] [2] which maps the vvar mapping to
generic code.

[1] https://lkml.kernel.org/r/20250305021711.3867874-4-jeffxu@google.com
[2] https://lkml.kernel.org/r/20250305021711.3867874-5-jeffxu@google.com

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 lib/vdso/datastore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/vdso/datastore.c b/lib/vdso/datastore.c
index e227fbbcb796..b7c7386c98a9 100644
--- a/lib/vdso/datastore.c
+++ b/lib/vdso/datastore.c
@@ -99,7 +99,8 @@ const struct vm_special_mapping vdso_vvar_mapping = {
 struct vm_area_struct *vdso_install_vvar_mapping(struct mm_struct *mm, unsigned long addr)
 {
 	return _install_special_mapping(mm, addr, VDSO_NR_PAGES * PAGE_SIZE,
-					VM_READ | VM_MAYREAD | VM_IO | VM_DONTDUMP | VM_PFNMAP,
+					VM_READ | VM_MAYREAD | VM_IO | VM_DONTDUMP |
+					VM_PFNMAP | VM_SEALED_SYSMAP,
 					&vdso_vvar_mapping);
 }
 
-- 
2.45.2