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-rw-r--r--arch/s390/mm/dump_pagetables.c15
-rw-r--r--arch/s390/mm/fault.c42
-rw-r--r--arch/s390/mm/hugetlbpage.c10
-rw-r--r--arch/s390/mm/init.c3
-rw-r--r--arch/s390/mm/pageattr.c117
-rw-r--r--arch/s390/mm/pgtable.c2
-rw-r--r--arch/s390/mm/vmem.c42
7 files changed, 146 insertions, 85 deletions
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 861880df12c7..5a46b1d7e578 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -49,8 +49,8 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level)
seq_printf(m, "I\n");
return;
}
- seq_printf(m, "%s", pr & _PAGE_PROTECT ? "RO " : "RW ");
- seq_putc(m, '\n');
+ seq_puts(m, (pr & _PAGE_PROTECT) ? "RO " : "RW ");
+ seq_puts(m, (pr & _PAGE_NOEXEC) ? "NX\n" : "X\n");
}
static void note_page(struct seq_file *m, struct pg_state *st,
@@ -117,7 +117,8 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st,
for (i = 0; i < PTRS_PER_PTE && addr < max_addr; i++) {
st->current_address = addr;
pte = pte_offset_kernel(pmd, addr);
- prot = pte_val(*pte) & (_PAGE_PROTECT | _PAGE_INVALID);
+ prot = pte_val(*pte) &
+ (_PAGE_PROTECT | _PAGE_INVALID | _PAGE_NOEXEC);
note_page(m, st, prot, 4);
addr += PAGE_SIZE;
}
@@ -135,7 +136,9 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
pmd = pmd_offset(pud, addr);
if (!pmd_none(*pmd)) {
if (pmd_large(*pmd)) {
- prot = pmd_val(*pmd) & _SEGMENT_ENTRY_PROTECT;
+ prot = pmd_val(*pmd) &
+ (_SEGMENT_ENTRY_PROTECT |
+ _SEGMENT_ENTRY_NOEXEC);
note_page(m, st, prot, 3);
} else
walk_pte_level(m, st, pmd, addr);
@@ -157,7 +160,9 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st,
pud = pud_offset(pgd, addr);
if (!pud_none(*pud))
if (pud_large(*pud)) {
- prot = pud_val(*pud) & _REGION_ENTRY_PROTECT;
+ prot = pud_val(*pud) &
+ (_REGION_ENTRY_PROTECT |
+ _REGION_ENTRY_NOEXEC);
note_page(m, st, prot, 2);
} else
walk_pmd_level(m, st, pud, addr);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index d1faae5cdd12..bb5560eb2435 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -311,12 +311,34 @@ static noinline void do_sigbus(struct pt_regs *regs)
force_sig_info(SIGBUS, &si, tsk);
}
-static noinline void do_fault_error(struct pt_regs *regs, int fault)
+static noinline int signal_return(struct pt_regs *regs)
+{
+ u16 instruction;
+ int rc;
+
+ rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
+ if (rc)
+ return rc;
+ if (instruction == 0x0a77) {
+ set_pt_regs_flag(regs, PIF_SYSCALL);
+ regs->int_code = 0x00040077;
+ return 0;
+ } else if (instruction == 0x0aad) {
+ set_pt_regs_flag(regs, PIF_SYSCALL);
+ regs->int_code = 0x000400ad;
+ return 0;
+ }
+ return -EACCES;
+}
+
+static noinline void do_fault_error(struct pt_regs *regs, int access, int fault)
{
int si_code;
switch (fault) {
case VM_FAULT_BADACCESS:
+ if (access == VM_EXEC && signal_return(regs) == 0)
+ break;
case VM_FAULT_BADMAP:
/* Bad memory access. Check if it is kernel or user space. */
if (user_mode(regs)) {
@@ -324,7 +346,7 @@ static noinline void do_fault_error(struct pt_regs *regs, int fault)
si_code = (fault == VM_FAULT_BADMAP) ?
SEGV_MAPERR : SEGV_ACCERR;
do_sigsegv(regs, si_code);
- return;
+ break;
}
case VM_FAULT_BADCONTEXT:
case VM_FAULT_PFAULT:
@@ -525,7 +547,7 @@ out:
void do_protection_exception(struct pt_regs *regs)
{
unsigned long trans_exc_code;
- int fault;
+ int access, fault;
trans_exc_code = regs->int_parm_long;
/*
@@ -544,9 +566,17 @@ void do_protection_exception(struct pt_regs *regs)
do_low_address(regs);
return;
}
- fault = do_exception(regs, VM_WRITE);
+ if (unlikely(MACHINE_HAS_NX && (trans_exc_code & 0x80))) {
+ regs->int_parm_long = (trans_exc_code & ~PAGE_MASK) |
+ (regs->psw.addr & PAGE_MASK);
+ access = VM_EXEC;
+ fault = VM_FAULT_BADACCESS;
+ } else {
+ access = VM_WRITE;
+ fault = do_exception(regs, access);
+ }
if (unlikely(fault))
- do_fault_error(regs, fault);
+ do_fault_error(regs, access, fault);
}
NOKPROBE_SYMBOL(do_protection_exception);
@@ -557,7 +587,7 @@ void do_dat_exception(struct pt_regs *regs)
access = VM_READ | VM_EXEC | VM_WRITE;
fault = do_exception(regs, access);
if (unlikely(fault))
- do_fault_error(regs, fault);
+ do_fault_error(regs, access, fault);
}
NOKPROBE_SYMBOL(do_dat_exception);
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 4a0c5bce3552..a03816227719 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -59,6 +59,8 @@ static inline unsigned long __pte_to_rste(pte_t pte)
rste |= move_set_bit(pte_val(pte), _PAGE_SOFT_DIRTY,
_SEGMENT_ENTRY_SOFT_DIRTY);
#endif
+ rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC,
+ _SEGMENT_ENTRY_NOEXEC);
} else
rste = _SEGMENT_ENTRY_INVALID;
return rste;
@@ -113,6 +115,8 @@ static inline pte_t __rste_to_pte(unsigned long rste)
pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY,
_PAGE_DIRTY);
#endif
+ pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC,
+ _PAGE_NOEXEC);
} else
pte_val(pte) = _PAGE_INVALID;
return pte;
@@ -121,7 +125,11 @@ static inline pte_t __rste_to_pte(unsigned long rste)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
- unsigned long rste = __pte_to_rste(pte);
+ unsigned long rste;
+
+ rste = __pte_to_rste(pte);
+ if (!MACHINE_HAS_NX)
+ rste &= ~_SEGMENT_ENTRY_NOEXEC;
/* Set correct table type for 2G hugepages */
if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index b67454ad8408..ba0c8d18e10d 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -137,6 +137,9 @@ void __init mem_init(void)
void free_initmem(void)
{
+ __set_memory((unsigned long) _sinittext,
+ (_einittext - _sinittext) >> PAGE_SHIFT,
+ SET_MEMORY_RW | SET_MEMORY_NX);
free_initmem_default(POISON_FREE_INITMEM);
}
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 44f150312a16..a1543b74ee00 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -81,24 +81,24 @@ static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
}
}
-struct cpa {
- unsigned int set_ro : 1;
- unsigned int clear_ro : 1;
-};
-
static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
- struct cpa cpa)
+ unsigned long flags)
{
pte_t *ptep, new;
ptep = pte_offset(pmdp, addr);
do {
- if (pte_none(*ptep))
+ new = *ptep;
+ if (pte_none(new))
return -EINVAL;
- if (cpa.set_ro)
- new = pte_wrprotect(*ptep);
- else if (cpa.clear_ro)
- new = pte_mkwrite(pte_mkdirty(*ptep));
+ if (flags & SET_MEMORY_RO)
+ new = pte_wrprotect(new);
+ else if (flags & SET_MEMORY_RW)
+ new = pte_mkwrite(pte_mkdirty(new));
+ if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
+ pte_val(new) |= _PAGE_NOEXEC;
+ else if (flags & SET_MEMORY_X)
+ pte_val(new) &= ~_PAGE_NOEXEC;
pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
ptep++;
addr += PAGE_SIZE;
@@ -112,14 +112,17 @@ static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
unsigned long pte_addr, prot;
pte_t *pt_dir, *ptep;
pmd_t new;
- int i, ro;
+ int i, ro, nx;
pt_dir = vmem_pte_alloc();
if (!pt_dir)
return -ENOMEM;
pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
+ nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
+ if (!nx)
+ prot &= ~_PAGE_NOEXEC;
ptep = pt_dir;
for (i = 0; i < PTRS_PER_PTE; i++) {
pte_val(*ptep) = pte_addr | prot;
@@ -133,19 +136,24 @@ static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
return 0;
}
-static void modify_pmd_page(pmd_t *pmdp, unsigned long addr, struct cpa cpa)
+static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
+ unsigned long flags)
{
- pmd_t new;
-
- if (cpa.set_ro)
- new = pmd_wrprotect(*pmdp);
- else if (cpa.clear_ro)
- new = pmd_mkwrite(pmd_mkdirty(*pmdp));
+ pmd_t new = *pmdp;
+
+ if (flags & SET_MEMORY_RO)
+ new = pmd_wrprotect(new);
+ else if (flags & SET_MEMORY_RW)
+ new = pmd_mkwrite(pmd_mkdirty(new));
+ if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
+ pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
+ else if (flags & SET_MEMORY_X)
+ pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
}
static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
- struct cpa cpa)
+ unsigned long flags)
{
unsigned long next;
pmd_t *pmdp;
@@ -163,9 +171,9 @@ static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
return rc;
continue;
}
- modify_pmd_page(pmdp, addr, cpa);
+ modify_pmd_page(pmdp, addr, flags);
} else {
- rc = walk_pte_level(pmdp, addr, next, cpa);
+ rc = walk_pte_level(pmdp, addr, next, flags);
if (rc)
return rc;
}
@@ -181,14 +189,17 @@ static int split_pud_page(pud_t *pudp, unsigned long addr)
unsigned long pmd_addr, prot;
pmd_t *pm_dir, *pmdp;
pud_t new;
- int i, ro;
+ int i, ro, nx;
pm_dir = vmem_pmd_alloc();
if (!pm_dir)
return -ENOMEM;
pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
+ nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
+ if (!nx)
+ prot &= ~_SEGMENT_ENTRY_NOEXEC;
pmdp = pm_dir;
for (i = 0; i < PTRS_PER_PMD; i++) {
pmd_val(*pmdp) = pmd_addr | prot;
@@ -202,19 +213,24 @@ static int split_pud_page(pud_t *pudp, unsigned long addr)
return 0;
}
-static void modify_pud_page(pud_t *pudp, unsigned long addr, struct cpa cpa)
+static void modify_pud_page(pud_t *pudp, unsigned long addr,
+ unsigned long flags)
{
- pud_t new;
-
- if (cpa.set_ro)
- new = pud_wrprotect(*pudp);
- else if (cpa.clear_ro)
- new = pud_mkwrite(pud_mkdirty(*pudp));
+ pud_t new = *pudp;
+
+ if (flags & SET_MEMORY_RO)
+ new = pud_wrprotect(new);
+ else if (flags & SET_MEMORY_RW)
+ new = pud_mkwrite(pud_mkdirty(new));
+ if ((flags & SET_MEMORY_NX) && MACHINE_HAS_NX)
+ pud_val(new) |= _REGION_ENTRY_NOEXEC;
+ else if (flags & SET_MEMORY_X)
+ pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
}
static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
- struct cpa cpa)
+ unsigned long flags)
{
unsigned long next;
pud_t *pudp;
@@ -232,9 +248,9 @@ static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
break;
continue;
}
- modify_pud_page(pudp, addr, cpa);
+ modify_pud_page(pudp, addr, flags);
} else {
- rc = walk_pmd_level(pudp, addr, next, cpa);
+ rc = walk_pmd_level(pudp, addr, next, flags);
}
pudp++;
addr = next;
@@ -246,7 +262,7 @@ static int walk_pud_level(pgd_t *pgd, unsigned long addr, unsigned long end,
static DEFINE_MUTEX(cpa_mutex);
static int change_page_attr(unsigned long addr, unsigned long end,
- struct cpa cpa)
+ unsigned long flags)
{
unsigned long next;
int rc = -EINVAL;
@@ -262,7 +278,7 @@ static int change_page_attr(unsigned long addr, unsigned long end,
if (pgd_none(*pgdp))
break;
next = pgd_addr_end(addr, end);
- rc = walk_pud_level(pgdp, addr, next, cpa);
+ rc = walk_pud_level(pgdp, addr, next, flags);
if (rc)
break;
cond_resched();
@@ -271,35 +287,10 @@ static int change_page_attr(unsigned long addr, unsigned long end,
return rc;
}
-int set_memory_ro(unsigned long addr, int numpages)
+int __set_memory(unsigned long addr, int numpages, unsigned long flags)
{
- struct cpa cpa = {
- .set_ro = 1,
- };
-
addr &= PAGE_MASK;
- return change_page_attr(addr, addr + numpages * PAGE_SIZE, cpa);
-}
-
-int set_memory_rw(unsigned long addr, int numpages)
-{
- struct cpa cpa = {
- .clear_ro = 1,
- };
-
- addr &= PAGE_MASK;
- return change_page_attr(addr, addr + numpages * PAGE_SIZE, cpa);
-}
-
-/* not possible */
-int set_memory_nx(unsigned long addr, int numpages)
-{
- return 0;
-}
-
-int set_memory_x(unsigned long addr, int numpages)
-{
- return 0;
+ return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
}
#ifdef CONFIG_DEBUG_PAGEALLOC
@@ -339,7 +330,7 @@ void __kernel_map_pages(struct page *page, int numpages, int enable)
nr = min(numpages - i, nr);
if (enable) {
for (j = 0; j < nr; j++) {
- pte_val(*pte) = address | pgprot_val(PAGE_KERNEL);
+ pte_val(*pte) &= ~_PAGE_INVALID;
address += PAGE_SIZE;
pte++;
}
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 7a1897c51c54..190d0c65904a 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -274,6 +274,8 @@ void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
{
pgste_t pgste;
+ if (!MACHINE_HAS_NX)
+ pte_val(pte) &= ~_PAGE_NOEXEC;
if (mm_has_pgste(mm)) {
pgste = pgste_get(ptep);
pgste_set_key(ptep, pgste, pte, mm);
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 45becc8a44ec..253046344b3c 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -79,6 +79,7 @@ pte_t __ref *vmem_pte_alloc(void)
*/
static int vmem_add_mem(unsigned long start, unsigned long size)
{
+ unsigned long pgt_prot, sgt_prot, r3_prot;
unsigned long pages4k, pages1m, pages2g;
unsigned long end = start + size;
unsigned long address = start;
@@ -88,6 +89,14 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
pte_t *pt_dir;
int ret = -ENOMEM;
+ pgt_prot = pgprot_val(PAGE_KERNEL);
+ sgt_prot = pgprot_val(SEGMENT_KERNEL);
+ r3_prot = pgprot_val(REGION3_KERNEL);
+ if (!MACHINE_HAS_NX) {
+ pgt_prot &= ~_PAGE_NOEXEC;
+ sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC;
+ r3_prot &= ~_REGION_ENTRY_NOEXEC;
+ }
pages4k = pages1m = pages2g = 0;
while (address < end) {
pg_dir = pgd_offset_k(address);
@@ -101,7 +110,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address &&
!(address & ~PUD_MASK) && (address + PUD_SIZE <= end) &&
!debug_pagealloc_enabled()) {
- pud_val(*pu_dir) = address | pgprot_val(REGION3_KERNEL);
+ pud_val(*pu_dir) = address | r3_prot;
address += PUD_SIZE;
pages2g++;
continue;
@@ -116,7 +125,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address &&
!(address & ~PMD_MASK) && (address + PMD_SIZE <= end) &&
!debug_pagealloc_enabled()) {
- pmd_val(*pm_dir) = address | pgprot_val(SEGMENT_KERNEL);
+ pmd_val(*pm_dir) = address | sgt_prot;
address += PMD_SIZE;
pages1m++;
continue;
@@ -129,7 +138,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size)
}
pt_dir = pte_offset_kernel(pm_dir, address);
- pte_val(*pt_dir) = address | pgprot_val(PAGE_KERNEL);
+ pte_val(*pt_dir) = address | pgt_prot;
address += PAGE_SIZE;
pages4k++;
}
@@ -200,6 +209,7 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
*/
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
{
+ unsigned long pgt_prot, sgt_prot;
unsigned long address = start;
pgd_t *pg_dir;
pud_t *pu_dir;
@@ -207,6 +217,12 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
pte_t *pt_dir;
int ret = -ENOMEM;
+ pgt_prot = pgprot_val(PAGE_KERNEL);
+ sgt_prot = pgprot_val(SEGMENT_KERNEL);
+ if (!MACHINE_HAS_NX) {
+ pgt_prot &= ~_PAGE_NOEXEC;
+ sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC;
+ }
for (address = start; address < end;) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
@@ -238,8 +254,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
new_page = vmemmap_alloc_block(PMD_SIZE, node);
if (!new_page)
goto out;
- pmd_val(*pm_dir) = __pa(new_page) |
- _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE;
+ pmd_val(*pm_dir) = __pa(new_page) | sgt_prot;
address = (address + PMD_SIZE) & PMD_MASK;
continue;
}
@@ -259,8 +274,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
new_page = vmemmap_alloc_block(PAGE_SIZE, node);
if (!new_page)
goto out;
- pte_val(*pt_dir) =
- __pa(new_page) | pgprot_val(PAGE_KERNEL);
+ pte_val(*pt_dir) = __pa(new_page) | pgt_prot;
}
address += PAGE_SIZE;
}
@@ -372,13 +386,21 @@ out:
*/
void __init vmem_map_init(void)
{
- unsigned long size = _eshared - _stext;
struct memblock_region *reg;
for_each_memblock(memory, reg)
vmem_add_mem(reg->base, reg->size);
- set_memory_ro((unsigned long)_stext, size >> PAGE_SHIFT);
- pr_info("Write protected kernel read-only data: %luk\n", size >> 10);
+ __set_memory((unsigned long) _stext,
+ (_etext - _stext) >> PAGE_SHIFT,
+ SET_MEMORY_RO | SET_MEMORY_X);
+ __set_memory((unsigned long) _etext,
+ (_eshared - _etext) >> PAGE_SHIFT,
+ SET_MEMORY_RO);
+ __set_memory((unsigned long) _sinittext,
+ (_einittext - _sinittext) >> PAGE_SHIFT,
+ SET_MEMORY_RO | SET_MEMORY_X);
+ pr_info("Write protected kernel read-only data: %luk\n",
+ (_eshared - _stext) >> 10);
}
/*