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Diffstat (limited to 'arch/s390/mm/pageattr.c')
-rw-r--r--arch/s390/mm/pageattr.c117
1 files changed, 54 insertions, 63 deletions
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++;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.