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-rw-r--r--mm/mprotect.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index dd3f40a2935f..abd9c8257b2e 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -417,6 +417,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
prev = vma;
for (nstart = start ; ; ) {
+ unsigned long mask_off_old_flags;
unsigned long newflags;
int new_vma_pkey;
@@ -426,9 +427,17 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
if (rier && (vma->vm_flags & VM_MAYEXEC))
prot |= PROT_EXEC;
+ /*
+ * Each mprotect() call explicitly passes r/w/x permissions.
+ * If a permission is not passed to mprotect(), it must be
+ * cleared from the VMA.
+ */
+ mask_off_old_flags = VM_READ | VM_WRITE | VM_EXEC |
+ ARCH_VM_PKEY_FLAGS;
+
new_vma_pkey = arch_override_mprotect_pkey(vma, prot, pkey);
newflags = calc_vm_prot_bits(prot, new_vma_pkey);
- newflags |= (vma->vm_flags & ~(VM_READ | VM_WRITE | VM_EXEC));
+ newflags |= (vma->vm_flags & ~mask_off_old_flags);
/* newflags >> 4 shift VM_MAY% in place of VM_% */
if ((newflags & ~(newflags >> 4)) & (VM_READ | VM_WRITE | VM_EXEC)) {