select HAVE_ARCH_JUMP_LABEL_RELATIVE
select HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_VMALLOC
+ select HAVE_ARCH_KFENCE
select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_SOFT_DIRTY
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_S390_KFENCE_H
+#define _ASM_S390_KFENCE_H
+
+#include <linux/mm.h>
+#include <linux/kfence.h>
+#include <asm/set_memory.h>
+#include <asm/page.h>
+
+void __kernel_map_pages(struct page *page, int numpages, int enable);
+
+static __always_inline bool arch_kfence_init_pool(void)
+{
+ return true;
+}
+
+#define arch_kfence_test_address(addr) ((addr) & PAGE_MASK)
+
+/*
+ * Do not split kfence pool to 4k mapping with arch_kfence_init_pool(),
+ * but earlier where page table allocations still happen with memblock.
+ * Reason is that arch_kfence_init_pool() gets called when the system
+ * is still in a limbo state - disabling and enabling bottom halves is
+ * not yet allowed, but that is what our page_table_alloc() would do.
+ */
+static __always_inline void kfence_split_mapping(void)
+{
+#ifdef CONFIG_KFENCE
+ unsigned long pool_pages = KFENCE_POOL_SIZE >> PAGE_SHIFT;
+
+ set_memory_4k((unsigned long)__kfence_pool, pool_pages);
+#endif
+}
+
+static inline bool kfence_protect_page(unsigned long addr, bool protect)
+{
+ __kernel_map_pages(virt_to_page(addr), 1, !protect);
+ return true;
+}
+
+#endif /* _ASM_S390_KFENCE_H */
#include <linux/kprobes.h>
#include <linux/uaccess.h>
#include <linux/hugetlb.h>
+#include <linux/kfence.h>
#include <asm/asm-offsets.h>
#include <asm/diag.h>
#include <asm/gmap.h>
unsigned long address;
unsigned int flags;
vm_fault_t fault;
+ bool is_write;
tsk = current;
/*
mm = tsk->mm;
trans_exc_code = regs->int_parm_long;
+ address = trans_exc_code & __FAIL_ADDR_MASK;
+ is_write = (trans_exc_code & store_indication) == 0x400;
/*
* Verify that the fault happened in user space, that
type = get_fault_type(regs);
switch (type) {
case KERNEL_FAULT:
+ if (kfence_handle_page_fault(address, is_write, regs))
+ return 0;
goto out;
case USER_FAULT:
case GMAP_FAULT:
break;
}
- address = trans_exc_code & __FAIL_ADDR_MASK;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
flags = FAULT_FLAG_DEFAULT;
if (user_mode(regs))
flags |= FAULT_FLAG_USER;
- if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400)
+ if (access == VM_WRITE || is_write)
flags |= FAULT_FLAG_WRITE;
mmap_read_lock(mm);
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/pgalloc.h>
+#include <asm/kfence.h>
#include <asm/ptdump.h>
#include <asm/dma.h>
#include <asm/lowcore.h>
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
pv_init();
-
+ kfence_split_mapping();
/* Setup guest page hinting */
cmma_init();
#include <asm/cacheflush.h>
#include <asm/facility.h>
#include <asm/pgalloc.h>
+#include <asm/kfence.h>
#include <asm/page.h>
#include <asm/set_memory.h>
return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
}
-#ifdef CONFIG_DEBUG_PAGEALLOC
+#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
static void ipte_range(pte_t *pte, unsigned long address, int nr)
{