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-rw-r--r--mm/mprotect.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index f8a4544b46..8c6cd88252 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -32,6 +32,7 @@
#include <linux/sched/sysctl.h>
#include <linux/userfaultfd_k.h>
#include <linux/memory-tiers.h>
+#include <uapi/linux/mman.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
@@ -129,7 +130,8 @@ static long change_pte_range(struct mmu_gather *tlb,
/* Also skip shared copy-on-write pages */
if (is_cow_mapping(vma->vm_flags) &&
- folio_ref_count(folio) != 1)
+ (folio_maybe_dma_pinned(folio) ||
+ folio_likely_mapped_shared(folio)))
continue;
/*
@@ -743,6 +745,15 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
}
}
+ /*
+ * checking if memory is sealed.
+ * can_modify_mm assumes we have acquired the lock on MM.
+ */
+ if (unlikely(!can_modify_mm(current->mm, start, end))) {
+ error = -EPERM;
+ goto out;
+ }
+
prev = vma_prev(&vmi);
if (start > vma->vm_start)
prev = vma;