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Message-Id: <20200406142045.32522-3-levonshe@gmail.com>
Date: Mon, 6 Apr 2020 17:20:42 +0300
From: Lev Olshvang <levonshe@...il.com>
To: arnd@...db.de
Cc: kernel-hardening@...ts.openwall.com,
Lev Olshvang <levonshe@...il.com>
Subject: [RFC PATCH 2/5] Prevent write to read-only pages from another process
Signed-off-by: Lev Olshvang <levonshe@...il.com>
---
arch/unicore32/include/asm/mmu_context.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/unicore32/include/asm/mmu_context.h b/arch/unicore32/include/asm/mmu_context.h
index 388c0c811c68..caf240b8a748 100644
--- a/arch/unicore32/include/asm/mmu_context.h
+++ b/arch/unicore32/include/asm/mmu_context.h
@@ -92,7 +92,12 @@ static inline void arch_unmap(struct mm_struct *mm,
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
bool write, bool execute, bool foreign)
{
+#ifdef CONFIG_PROTECT_READONLY_USER_MEMORY
+ /* Forbid write to PROT_READ pages of foreign process */
+ if (write && foreign && (!(vma->vm_flags & VM_WRITE)))
+ return false;
+#endif
/* by default, allow everything */
return true;
}
-#endif
+#endif /*__UNICORE_MMU_CONTEXT_H__*/
--
2.17.1
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