On 10/02/2017 11:40 AM, Arnd Bergmann wrote:
> The hardened strlen() function causes rather large stack usage
> in at least one file in the kernel when CONFIG_KASAN is enabled:
>
> drivers/media/usb/em28xx/em28xx-dvb.c: In function 'em28xx_dvb_init':
> drivers/media/usb/em28xx/em28xx-dvb.c:2062:1:
On 09/27/2017 04:26 PM, Arnd Bergmann wrote:
> On Tue, Sep 26, 2017 at 9:49 AM, Andrey Ryabinin
> wrote:
>>
>>
>> On 09/26/2017 09:47 AM, Arnd Bergmann wrote:
>>> On Mon, Sep 25, 2017 at 11:32 PM, Arnd Bergmann wrote:
>
>>> + ret = __builtin_st
ow_bug.cgi?id=81715)
> and a workaround for older compilers, which means that KASAN_EXTRA is
> now just as bad as before and will lead to an instant stack overflow in
> a few extreme cases.
>
> This reverts parts of commit commit 3f181b4 ("lib/Kconfig.debug: disable
> -Wframe-larger-than warnings with KASAN=y").
>
> Signed-off-by: Arnd Bergmann
Acked-by: Andrey Ryabinin
On 09/26/2017 09:47 AM, Arnd Bergmann wrote:
> On Mon, Sep 25, 2017 at 11:32 PM, Arnd Bergmann wrote:
>> On Mon, Sep 25, 2017 at 7:41 AM, David Laight
>> wrote:
>>> From: Arnd Bergmann
Sent: 22 September 2017 22:29
>>> ...
It seems that this is triggered in part by using strlcpy(), w
On 03/03/2017 05:54 PM, Arnd Bergmann wrote:
> On Fri, Mar 3, 2017 at 3:20 PM, Andrey Ryabinin
> wrote:
>>
>>
>> On 03/02/2017 07:38 PM, Arnd Bergmann wrote:
>>> When CONFIG_KASAN is enabled, we have several functions that use rather
>>> large kernel
On 03/02/2017 07:38 PM, Arnd Bergmann wrote:
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 97d62c2da6c2..27c838c40a36 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -216,10 +216,9 @@ config ENABLE_MUST_CHECK
> config FRAME_WARN
> int "Warn for stack fram
On 03/02/2017 07:38 PM, Arnd Bergmann wrote:
> When CONFIG_KASAN is enabled, we have several functions that use rather
> large kernel stacks, e.g.
>
> drivers/isdn/hardware/eicon/message.c: In function 'group_optimization':
> drivers/isdn/hardware/eicon/message.c:14841:1: warning: the frame size
On 03/02/2017 07:38 PM, Arnd Bergmann wrote:
> When CONFIG_KASAN is set, we can run into some code that uses incredible
> amounts of kernel stack:
>
> drivers/staging/dgnc/dgnc_neo.c:1056:1: error: the frame size of 2 bytes
> is larger than 2048 bytes [-Werror=frame-larger-than=]
> drivers/
16 октября 2015 г. 19:47:00 GMT+03:00, Andi Kleen пишет:
>On Fri, Oct 16, 2015 at 07:02:10PM +0300, Andrey Ryabinin wrote:
>> When the kernel compiled with KASAN=y, GCC adds redzones
>> for each variable on stack. This enlarges function's stack
>> frame and causes:
&
hus we should turn it off.
Reported-by: Fengguang Wu
Signed-off-by: Andrey Ryabinin
---
lib/Kconfig.debug | 1 +
1 file changed, 1 insertion(+)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index ab76b99..1d1521c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -197,6 +197,7 @@ config
2015-10-05 14:09 GMT+03:00 Fengguang Wu :
> Hi Abylay,
>
>> cause of this 'Kernel Address sanitizer (KASan)' is enabled in your
>> config. With gcc-4.9 kasan was disabled in compile time because of:
>> "scripts/Makefile.kasan:23: CONFIG_KASAN: compiler does not support
>> all options. Trying minima
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