From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Russell King <linux@armlinux.org.uk>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: [PATCH 2/4] ARM: mm: Provide is_write_fault()
Date: Wed, 25 Aug 2021 17:21:14 +0800 [thread overview]
Message-ID: <20210825092116.149975-3-wangkefeng.wang@huawei.com> (raw)
In-Reply-To: <20210825092116.149975-1-wangkefeng.wang@huawei.com>
The function will check whether the fault is caused by a write access.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
arch/arm/mm/fault.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index bc8779d54a64..f7ab6dabe89f 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -207,6 +207,11 @@ static inline bool is_permission_fault(unsigned int fsr)
return false;
}
+static inline bool is_write_fault(unsigned int fsr)
+{
+ return (fsr & FSR_WRITE) && !(fsr & FSR_CM);
+}
+
static vm_fault_t __kprobes
__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int flags,
unsigned long vma_flags, struct pt_regs *regs)
@@ -261,7 +266,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
if (user_mode(regs))
flags |= FAULT_FLAG_USER;
- if ((fsr & FSR_WRITE) && !(fsr & FSR_CM)) {
+ if (is_write_fault(fsr)) {
flags |= FAULT_FLAG_WRITE;
vm_flags = VM_WRITE;
}
--
2.26.2
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next prev parent reply other threads:[~2021-08-25 9:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-25 9:21 [PATCH 0/4] ARM: Support KFENCE feature Kefeng Wang
2021-08-25 9:21 ` [PATCH 1/4] ARM: mm: Provide set_memory_valid() Kefeng Wang
2021-08-25 9:21 ` Kefeng Wang [this message]
2021-08-25 9:21 ` [PATCH 3/4] ARM: Support KFENCE for ARM Kefeng Wang
2021-08-25 13:18 ` ownia
2021-08-25 14:31 ` Kefeng Wang
2021-08-25 9:21 ` [PATCH 4/4] mm: kfence: Only load kfence_test when kfence is enabled Kefeng Wang
2021-08-25 9:31 ` Alexander Potapenko
2021-08-25 9:54 ` Marco Elver
2021-08-25 9:55 ` Kefeng Wang
2021-08-25 9:59 ` Marco Elver
2021-08-25 10:14 ` [PATCH 0/4] ARM: Support KFENCE feature Marco Elver
2021-08-25 10:57 ` Marco Elver
2021-08-25 14:15 ` Kefeng Wang
2021-08-25 14:28 ` Kefeng Wang
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