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Message-Id: <20200413153211.29876-2-levonshe@gmail.com>
Date: Mon, 13 Apr 2020 18:32:07 +0300
From: Lev Olshvang <levonshe@...il.com>
To: keescook@...omium.orh
Cc: kernel-hardening@...ts.openwall.com,
Lev Olshvang <levonshe@...il.com>
Subject: [PATCH v3 1/5] 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 | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 701a7367babf..4e55370e48e8 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -5,7 +5,6 @@
#include <asm/desc.h>
#include <linux/atomic.h>
#include <linux/mm_types.h>
-#include <linux/printk.h>
#include <linux/pkeys.h>
#include <trace/events/tlb.h>
@@ -217,12 +216,7 @@ 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, execute, foreign))) {
- pr_err_once("Error : PID[%d] %s writes to read only memory\n",
- current->tgid, current->comm);
- return false;
- }
- /* Don't check PKRU since pkeys never affect instruction fetches */
+ /* pkeys never affect instruction fetches */
if (execute)
return true;
/* allow access if the VMA is not one from this process */
--
2.17.1
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