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-rw-r--r--arch/powerpc/include/asm/book3s/32/pgtable.h2
-rw-r--r--arch/powerpc/include/asm/book3s/64/pgtable.h4
-rw-r--r--arch/powerpc/include/asm/nohash/32/pte-8xx.h1
-rw-r--r--arch/powerpc/include/asm/nohash/pgtable.h2
-rw-r--r--arch/powerpc/include/asm/nohash/pte-e500.h1
-rw-r--r--arch/powerpc/include/asm/pgtable-masks.h2
-rw-r--r--arch/powerpc/mm/book3s64/pgtable.c10
-rw-r--r--arch/powerpc/mm/fault.c9
-rw-r--r--arch/powerpc/mm/pgtable.c4
9 files changed, 18 insertions, 17 deletions
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 244621c88510..52971ee30717 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -425,7 +425,7 @@ static inline bool pte_access_permitted(pte_t pte, bool write)
{
/*
* A read-only access is controlled by _PAGE_READ bit.
- * We have _PAGE_READ set for WRITE and EXECUTE
+ * We have _PAGE_READ set for WRITE
*/
if (!pte_present(pte) || !pte_read(pte))
return false;
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 0fd12bdc7b5e..751b01227e36 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -18,6 +18,7 @@
#define _PAGE_WRITE 0x00002 /* write access allowed */
#define _PAGE_READ 0x00004 /* read access allowed */
#define _PAGE_NA _PAGE_PRIVILEGED
+#define _PAGE_NAX _PAGE_EXEC
#define _PAGE_RO _PAGE_READ
#define _PAGE_ROX (_PAGE_READ | _PAGE_EXEC)
#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
@@ -141,9 +142,6 @@
#include <asm/pgtable-masks.h>
-/* Radix only, Hash uses PAGE_READONLY_X + execute-only pkey instead */
-#define PAGE_EXECONLY __pgprot(_PAGE_BASE | _PAGE_EXEC)
-
/* Permission masks used for kernel mappings */
#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | _PAGE_TOLERANT)
diff --git a/arch/powerpc/include/asm/nohash/32/pte-8xx.h b/arch/powerpc/include/asm/nohash/32/pte-8xx.h
index 1ee38befd29a..137dc3c84e45 100644
--- a/arch/powerpc/include/asm/nohash/32/pte-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/pte-8xx.h
@@ -48,6 +48,7 @@
#define _PAGE_HUGE 0x0800 /* Copied to L1 PS bit 29 */
+#define _PAGE_NAX (_PAGE_NA | _PAGE_EXEC)
#define _PAGE_ROX (_PAGE_RO | _PAGE_EXEC)
#define _PAGE_RW 0
#define _PAGE_RWX _PAGE_EXEC
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index 8804bcc260cb..427db14292c9 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -202,7 +202,7 @@ static inline bool pte_access_permitted(pte_t pte, bool write)
{
/*
* A read-only access is controlled by _PAGE_READ bit.
- * We have _PAGE_READ set for WRITE and EXECUTE
+ * We have _PAGE_READ set for WRITE
*/
if (!pte_present(pte) || !pte_read(pte))
return false;
diff --git a/arch/powerpc/include/asm/nohash/pte-e500.h b/arch/powerpc/include/asm/nohash/pte-e500.h
index 31d2c3ea7df8..f516f0b5b7a8 100644
--- a/arch/powerpc/include/asm/nohash/pte-e500.h
+++ b/arch/powerpc/include/asm/nohash/pte-e500.h
@@ -57,6 +57,7 @@
#define _PAGE_KERNEL_ROX (_PAGE_BAP_SR | _PAGE_BAP_SX)
#define _PAGE_NA 0
+#define _PAGE_NAX _PAGE_BAP_UX
#define _PAGE_RO _PAGE_READ
#define _PAGE_ROX (_PAGE_READ | _PAGE_BAP_UX)
#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
diff --git a/arch/powerpc/include/asm/pgtable-masks.h b/arch/powerpc/include/asm/pgtable-masks.h
index 808a3b9e8fc0..6e8e2db26a5a 100644
--- a/arch/powerpc/include/asm/pgtable-masks.h
+++ b/arch/powerpc/include/asm/pgtable-masks.h
@@ -4,6 +4,7 @@
#ifndef _PAGE_NA
#define _PAGE_NA 0
+#define _PAGE_NAX _PAGE_EXEC
#define _PAGE_RO _PAGE_READ
#define _PAGE_ROX (_PAGE_READ | _PAGE_EXEC)
#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
@@ -20,6 +21,7 @@
/* Permission masks used to generate the __P and __S table */
#define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_NA)
+#define PAGE_EXECONLY_X __pgprot(_PAGE_BASE | _PAGE_NAX)
#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW)
#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RWX)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_RO)
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 8f8a62d3ff4d..be229290a6a7 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -635,12 +635,10 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags)
unsigned long prot;
/* Radix supports execute-only, but protection_map maps X -> RX */
- if (radix_enabled() && ((vm_flags & VM_ACCESS_FLAGS) == VM_EXEC)) {
- prot = pgprot_val(PAGE_EXECONLY);
- } else {
- prot = pgprot_val(protection_map[vm_flags &
- (VM_ACCESS_FLAGS | VM_SHARED)]);
- }
+ if (!radix_enabled() && ((vm_flags & VM_ACCESS_FLAGS) == VM_EXEC))
+ vm_flags |= VM_READ;
+
+ prot = pgprot_val(protection_map[vm_flags & (VM_ACCESS_FLAGS | VM_SHARED)]);
if (vm_flags & VM_SAO)
prot |= _PAGE_SAO;
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index b1723094d464..9e49ede2bc1c 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -266,14 +266,15 @@ static bool access_error(bool is_write, bool is_exec, struct vm_area_struct *vma
}
/*
- * VM_READ, VM_WRITE and VM_EXEC all imply read permissions, as
- * defined in protection_map[]. Read faults can only be caused by
- * a PROT_NONE mapping, or with a PROT_EXEC-only mapping on Radix.
+ * VM_READ, VM_WRITE and VM_EXEC may imply read permissions, as
+ * defined in protection_map[]. In that case Read faults can only be
+ * caused by a PROT_NONE mapping. However a non exec access on a
+ * VM_EXEC only mapping is invalid anyway, so report it as such.
*/
if (unlikely(!vma_is_accessible(vma)))
return true;
- if (unlikely(radix_enabled() && ((vma->vm_flags & VM_ACCESS_FLAGS) == VM_EXEC)))
+ if ((vma->vm_flags & VM_ACCESS_FLAGS) == VM_EXEC)
return true;
/*
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 781a68c69c2f..79508c1d15d7 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -492,7 +492,7 @@ const pgprot_t protection_map[16] = {
[VM_READ] = PAGE_READONLY,
[VM_WRITE] = PAGE_COPY,
[VM_WRITE | VM_READ] = PAGE_COPY,
- [VM_EXEC] = PAGE_READONLY_X,
+ [VM_EXEC] = PAGE_EXECONLY_X,
[VM_EXEC | VM_READ] = PAGE_READONLY_X,
[VM_EXEC | VM_WRITE] = PAGE_COPY_X,
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X,
@@ -500,7 +500,7 @@ const pgprot_t protection_map[16] = {
[VM_SHARED | VM_READ] = PAGE_READONLY,
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
- [VM_SHARED | VM_EXEC] = PAGE_READONLY_X,
+ [VM_SHARED | VM_EXEC] = PAGE_EXECONLY_X,
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X,
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_X,
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.