Commit 24e3f9fb authored by Heiko Carstens's avatar Heiko Carstens Committed by Andrew Morton
Browse files

mseal sysmap: enable s390 

Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on s390, covering the
vdso.

[hca@linux.ibm.com: update supported architectures]
  Link: https://lkml.kernel.org/r/20250317131917.1332402-1-hca@linux.ibm.com
Link: https://lkml.kernel.org/r/20250311123326.2686682-3-hca@linux.ibm.com


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Reviewed-by: default avatarLorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b481341e

Documentation/userspace-api/mseal.rst

+2 −1
Original line number Diff line number Diff line
@@ -143,7 +143,8 @@ Use cases 
  the CONFIG_MSEAL_SYSTEM_MAPPINGS seals all system mappings of this

  architecture.



  The following architectures currently support this feature: x86-64 and arm64.

  The following architectures currently support this feature: x86-64, arm64,

  and s390.



  WARNING: This feature breaks programs which rely on relocating

  or unmapping system mappings. Known broken software at the time

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -137,6 +137,7 @@ 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

arch/s390/kernel/vdso.c

+1 −1
Original line number Diff line number Diff line
@@ -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)) {