121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include "lkdtm.h"
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <asm/mmu.h>
|
|
|
|
/* Inserts new slb entries */
|
|
static void insert_slb_entry(unsigned long p, int ssize, int page_size)
|
|
{
|
|
unsigned long flags;
|
|
|
|
flags = SLB_VSID_KERNEL | mmu_psize_defs[page_size].sllp;
|
|
preempt_disable();
|
|
|
|
asm volatile("slbmte %0,%1" :
|
|
: "r" (mk_vsid_data(p, ssize, flags)),
|
|
"r" (mk_esid_data(p, ssize, SLB_NUM_BOLTED))
|
|
: "memory");
|
|
|
|
asm volatile("slbmte %0,%1" :
|
|
: "r" (mk_vsid_data(p, ssize, flags)),
|
|
"r" (mk_esid_data(p, ssize, SLB_NUM_BOLTED + 1))
|
|
: "memory");
|
|
preempt_enable();
|
|
}
|
|
|
|
/* Inject slb multihit on vmalloc-ed address i.e 0xD00... */
|
|
static int inject_vmalloc_slb_multihit(void)
|
|
{
|
|
char *p;
|
|
|
|
p = vmalloc(PAGE_SIZE);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
insert_slb_entry((unsigned long)p, MMU_SEGSIZE_1T, mmu_vmalloc_psize);
|
|
/*
|
|
* This triggers exception, If handled correctly we must recover
|
|
* from this error.
|
|
*/
|
|
p[0] = '!';
|
|
vfree(p);
|
|
return 0;
|
|
}
|
|
|
|
/* Inject slb multihit on kmalloc-ed address i.e 0xC00... */
|
|
static int inject_kmalloc_slb_multihit(void)
|
|
{
|
|
char *p;
|
|
|
|
p = kmalloc(2048, GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
insert_slb_entry((unsigned long)p, MMU_SEGSIZE_1T, mmu_linear_psize);
|
|
/*
|
|
* This triggers exception, If handled correctly we must recover
|
|
* from this error.
|
|
*/
|
|
p[0] = '!';
|
|
kfree(p);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Few initial SLB entries are bolted. Add a test to inject
|
|
* multihit in bolted entry 0.
|
|
*/
|
|
static void insert_dup_slb_entry_0(void)
|
|
{
|
|
unsigned long test_address = PAGE_OFFSET, *test_ptr;
|
|
unsigned long esid, vsid;
|
|
unsigned long i = 0;
|
|
|
|
test_ptr = (unsigned long *)test_address;
|
|
preempt_disable();
|
|
|
|
asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i));
|
|
asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i));
|
|
|
|
/* for i !=0 we would need to mask out the old entry number */
|
|
asm volatile("slbmte %0,%1" :
|
|
: "r" (vsid),
|
|
"r" (esid | SLB_NUM_BOLTED)
|
|
: "memory");
|
|
|
|
asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i));
|
|
asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i));
|
|
|
|
/* for i !=0 we would need to mask out the old entry number */
|
|
asm volatile("slbmte %0,%1" :
|
|
: "r" (vsid),
|
|
"r" (esid | (SLB_NUM_BOLTED + 1))
|
|
: "memory");
|
|
|
|
pr_info("%s accessing test address 0x%lx: 0x%lx\n",
|
|
__func__, test_address, *test_ptr);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
void lkdtm_PPC_SLB_MULTIHIT(void)
|
|
{
|
|
if (!radix_enabled()) {
|
|
pr_info("Injecting SLB multihit errors\n");
|
|
/*
|
|
* These need not be separate tests, And they do pretty
|
|
* much same thing. In any case we must recover from the
|
|
* errors introduced by these functions, machine would not
|
|
* survive these tests in case of failure to handle.
|
|
*/
|
|
inject_vmalloc_slb_multihit();
|
|
inject_kmalloc_slb_multihit();
|
|
insert_dup_slb_entry_0();
|
|
pr_info("Recovered from SLB multihit errors\n");
|
|
} else {
|
|
pr_err("XFAIL: This test is for ppc64 and with hash mode MMU only\n");
|
|
}
|
|
}
|