[S390] noexec protection
This provides a noexec protection on s390 hardware. Our hardware does
not have any bits left in the pte for a hw noexec bit, so this is a
different approach using shadow page tables and a special addressing
mode that allows separate address spaces for code and data.
As a special feature of our "secondary-space" addressing mode, separate
page tables can be specified for the translation of data addresses
(storage operands) and instruction addresses. The shadow page table is
used for the instruction addresses and the standard page table for the
data addresses.
The shadow page table is linked to the standard page table by a pointer
in page->lru.next of the struct page corresponding to the page that
contains the standard page table (since page->private is not really
private with the pte_lock and the page table pages are not in the LRU
list).
Depending on the software bits of a pte, it is either inserted into
both page tables or just into the standard (data) page table. Pages of
a vma that does not have the VM_EXEC bit set get mapped only in the
data address space. Any try to execute code on such a page will cause a
page translation exception. The standard reaction to this is a SIGSEGV
with two exceptions: the two system call opcodes 0x0a77 (sys_sigreturn)
and 0x0aad (sys_rt_sigreturn) are allowed. They are stored by the
kernel to the signal stack frame. Unfortunately, the signal return
mechanism cannot be modified to use an SA_RESTORER because the
exception unwinding code depends on the system call opcode stored
behind the signal stack frame.
This feature requires that user space is executed in secondary-space
mode and the kernel in home-space mode, which means that the addressing
modes need to be switched and that the noexec protection only works
for user space.
After switching the addressing modes, we cannot use the mvcp/mvcs
instructions anymore to copy between kernel and user space. A new
mvcos instruction has been added to the z9 EC/BC hardware which allows
to copy between arbitrary address spaces, but on older hardware the
page tables need to be walked manually.
Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/compat.h b/include/asm-s390/compat.h
index 356a0b1..296f4f1 100644
--- a/include/asm-s390/compat.h
+++ b/include/asm-s390/compat.h
@@ -6,6 +6,34 @@
#include <linux/types.h>
#include <linux/sched.h>
+#define PSW32_MASK_PER 0x40000000UL
+#define PSW32_MASK_DAT 0x04000000UL
+#define PSW32_MASK_IO 0x02000000UL
+#define PSW32_MASK_EXT 0x01000000UL
+#define PSW32_MASK_KEY 0x00F00000UL
+#define PSW32_MASK_MCHECK 0x00040000UL
+#define PSW32_MASK_WAIT 0x00020000UL
+#define PSW32_MASK_PSTATE 0x00010000UL
+#define PSW32_MASK_ASC 0x0000C000UL
+#define PSW32_MASK_CC 0x00003000UL
+#define PSW32_MASK_PM 0x00000f00UL
+
+#define PSW32_ADDR_AMODE31 0x80000000UL
+#define PSW32_ADDR_INSN 0x7FFFFFFFUL
+
+#define PSW32_BASE_BITS 0x00080000UL
+
+#define PSW32_ASC_PRIMARY 0x00000000UL
+#define PSW32_ASC_ACCREG 0x00004000UL
+#define PSW32_ASC_SECONDARY 0x00008000UL
+#define PSW32_ASC_HOME 0x0000C000UL
+
+#define PSW32_MASK_MERGE(CURRENT,NEW) \
+ (((CURRENT) & ~(PSW32_MASK_CC|PSW32_MASK_PM)) | \
+ ((NEW) & (PSW32_MASK_CC|PSW32_MASK_PM)))
+
+extern long psw32_user_bits;
+
#define COMPAT_USER_HZ 100
typedef u32 compat_size_t;