From: sanggil2.kim@samsung.com
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Sanggil Kim <sanggil2.kim@samsung.com>
Subject: [PATCH] arm64: kernel: Add module symbols _text, _etext.
Date: Thu, 9 Jul 2020 17:23:45 +0900 [thread overview]
Message-ID: <1594283025-4166-1-git-send-email-sanggil2.kim@samsung.com> (raw)
In-Reply-To: CGME20200709082408epcas2p4369fa8f06a57c7358be38282aae0f501@epcas2p4.samsung.com
From: Sanggil Kim <sanggil2.kim@samsung.com>
We have a solution to protect kernel code section(autually from _text to
_etext) by not MMU. In order to do this, we have to know the addresses
of _text and _etext at runtime.
Signed-off-by: Sanggil Kim <sanggil2.kim@samsung.com>
---
arch/arm64/kernel/head.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 037421c..09b405e 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -1003,3 +1003,6 @@ SYM_FUNC_START_LOCAL(__primary_switch)
adrp x0, __PHYS_OFFSET
br x8
SYM_FUNC_END(__primary_switch)
+
+EXPORT_SYMBOL(_text)
+EXPORT_SYMBOL(_etext)
--
2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: sanggil2.kim@samsung.com
To: linux-arm-kernel@lists.infradead.org
Cc: Sanggil Kim <sanggil2.kim@samsung.com>, linux-kernel@vger.kernel.org
Subject: [PATCH] arm64: kernel: Add module symbols _text, _etext.
Date: Thu, 9 Jul 2020 17:23:45 +0900 [thread overview]
Message-ID: <1594283025-4166-1-git-send-email-sanggil2.kim@samsung.com> (raw)
In-Reply-To: CGME20200709082408epcas2p4369fa8f06a57c7358be38282aae0f501@epcas2p4.samsung.com
From: Sanggil Kim <sanggil2.kim@samsung.com>
We have a solution to protect kernel code section(autually from _text to
_etext) by not MMU. In order to do this, we have to know the addresses
of _text and _etext at runtime.
Signed-off-by: Sanggil Kim <sanggil2.kim@samsung.com>
---
arch/arm64/kernel/head.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 037421c..09b405e 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -1003,3 +1003,6 @@ SYM_FUNC_START_LOCAL(__primary_switch)
adrp x0, __PHYS_OFFSET
br x8
SYM_FUNC_END(__primary_switch)
+
+EXPORT_SYMBOL(_text)
+EXPORT_SYMBOL(_etext)
--
2.7.4
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next parent reply other threads:[~2020-07-09 8:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200709082408epcas2p4369fa8f06a57c7358be38282aae0f501@epcas2p4.samsung.com>
2020-07-09 8:23 ` sanggil2.kim [this message]
2020-07-09 8:23 ` [PATCH] arm64: kernel: Add module symbols _text, _etext sanggil2.kim
2020-07-09 9:49 ` Will Deacon
2020-07-09 9:49 ` Will Deacon
2020-07-09 11:01 ` Christoph Hellwig
2020-07-09 11:01 ` Christoph Hellwig
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