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Message-Id: <20200416155917.28536-3-levonshe@gmail.com>
Date: Thu, 16 Apr 2020 18:59:17 +0300
From: Lev Olshvang <levonshe@...il.com>
To: keescook@...omium.org
Cc: kernel-hardening@...ts.openwall.com,
Lev Olshvang <levonshe@...il.com>
Subject: [PATCH v4 2/2] Hardening x86: Forbid writes to read-only memory pages of a process
Signed-off-by: Lev Olshvang <levonshe@...il.com>
---
arch/x86/include/asm/mmu_context.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 4e55370e48e8..e9b820780424 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -216,6 +216,11 @@ static inline void arch_unmap(struct mm_struct *mm, unsigned long start,
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
bool write, bool execute, bool foreign)
{
+ if (unlikely(!vma_write_allowed(vma, write, foreign))) {
+ pr_err_once("Error : PID[%d] %s writes to read only memory\n",
+ current->pid, current->comm);
+ return false;
+ }
/* pkeys never affect instruction fetches */
if (execute)
return true;
--
2.17.1
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