* [PATCH] arm64: kernel: Add module symbols _text, _etext. [not found] <CGME20200709082408epcas2p4369fa8f06a57c7358be38282aae0f501@epcas2p4.samsung.com> @ 2020-07-09 8:23 ` sanggil2.kim 2020-07-09 9:49 ` Will Deacon 0 siblings, 1 reply; 3+ messages in thread From: sanggil2.kim @ 2020-07-09 8:23 UTC (permalink / raw) To: linux-arm-kernel; +Cc: linux-kernel, Sanggil Kim 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 ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] arm64: kernel: Add module symbols _text, _etext. 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 11:01 ` Christoph Hellwig 0 siblings, 1 reply; 3+ messages in thread From: Will Deacon @ 2020-07-09 9:49 UTC (permalink / raw) To: sanggil2.kim; +Cc: linux-arm-kernel, linux-kernel On Thu, Jul 09, 2020 at 05:23:45PM +0900, sanggil2.kim@samsung.com wrote: > 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. Interesting! Can you post patches so that we can implement this solution upstream? Without an in-tree user, we won't be exporting these symbols. Thanks, Will ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] arm64: kernel: Add module symbols _text, _etext. 2020-07-09 9:49 ` Will Deacon @ 2020-07-09 11:01 ` Christoph Hellwig 0 siblings, 0 replies; 3+ messages in thread From: Christoph Hellwig @ 2020-07-09 11:01 UTC (permalink / raw) To: Will Deacon; +Cc: sanggil2.kim, linux-arm-kernel, linux-kernel On Thu, Jul 09, 2020 at 10:49:51AM +0100, Will Deacon wrote: > On Thu, Jul 09, 2020 at 05:23:45PM +0900, sanggil2.kim@samsung.com wrote: > > 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. > > Interesting! Can you post patches so that we can implement this solution > upstream? Without an in-tree user, we won't be exporting these symbols. And even with that I'm pretty sure the code doing the 'protection' should be built-in and not modular.. ^ permalink raw reply [flat|nested] 3+ messages in thread
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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 11:01 ` Christoph Hellwig
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