[ptxdist] arm-1136jfs-linux-gnueabihf-ld: warning: -z , relro ignored. at module compilation

[ptxdist] arm-1136jfs-linux-gnueabihf-ld: warning: -z , relro ignored. at module compilation

[Matthias Klein]

Hello,

can anyone give me a tip what the following warnings mean while 
compiling a kernel module:

make V=0 -C 
/home/user/rpi-ptxdist/platform-linux-raspberrypi/build-target/linux-3.17 SUBDIRS=/home/mak/rpi_gpio_irq_test 
modules
make[1]: Entering directory '/home/mak/rpi-dt-linux'
   CC [M]  /home/mak/rpi_gpio_irq_test/irq_test.o
   LD [M]  /home/mak/rpi_gpio_irq_test/irq_test_driver.o
/home/user/rpi-ptxdist/platform-linux-raspberrypi/sysroot-host/lib/wrapper/real/arm-1136jfs-linux-gnueabihf-ld: 
warning: -z ,relro ignored.
/home/user/rpi-ptxdist/platform-linux-raspberrypi/sysroot-host/lib/wrapper/real/arm-1136jfs-linux-gnueabihf-ld: 
warning: -z ,now ignored.
   Building modules, stage 2.
   MODPOST 1 modules
   CC      /home/mak/rpi_gpio_irq_test/irq_test_driver.mod.o
   LD [M]  /home/mak/rpi_gpio_irq_test/irq_test_driver.ko
/home/user/rpi-ptxdist/platform-linux-raspberrypi/sysroot-host/lib/wrapper/real/arm-1136jfs-linux-gnueabihf-ld: 
warning: -z ,relro ignored.
/home/user/rpi-ptxdist/platform-linux-raspberrypi/sysroot-host/lib/wrapper/real/arm-1136jfs-linux-gnueabihf-ld: 
warning: -z ,now ignored.
make[1]: Leaving directory '/home/mak/rpi-dt-linux'


The code can be found here: 
https://github.com/matthiasklein/rpi_gpio_irq_test


Best regards,
Matthias


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Re: [ptxdist] arm-1136jfs-linux-gnueabihf-ld: warning: -z , relro ignored. at module compilation

[Juergen Borleis]

Hi Matthias,

On Tuesday 28 October 2014 12:00:33 Matthias Klein wrote:
> can anyone give me a tip what the following warnings mean while
> compiling a kernel module:#
>
> [...]
>
> arm-1136jfs-linux-gnueabihf-ld: warning: -z ,now ignored.
>
> [...]

Did you add something to "ptxdist platform -> architecture -> extra toolchain 
options"?

Or did you enable the "hardening options" (like TARGET_HARDEN_RELRO for 
example)? Then you should let PTXdist sort out these options for your kernel 
module. They are important for userland only. Refer the "kernel.make" rule 
file and the macro "*_WRAPPER_BLACKLIST". The same you need for your module 
rule file.

Regards,
Juergen

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Pengutronix e.K.                              | Juergen Borleis             |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |

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Re: [ptxdist] arm-1136jfs-linux-gnueabihf-ld: warning: -z , relro ignored. at module compilation

[Matthias Klein]

Am 28.10.2014 um 12:16 schrieb Juergen Borleis:
> Hi Matthias,
>
> On Tuesday 28 October 2014 12:00:33 Matthias Klein wrote:
>> can anyone give me a tip what the following warnings mean while
>> compiling a kernel module:#
>>
>> [...]
>>
>> arm-1136jfs-linux-gnueabihf-ld: warning: -z ,now ignored.
>>
>> [...]
> Did you add something to "ptxdist platform -> architecture -> extra toolchain
> options"?
>
> Or did you enable the "hardening options" (like TARGET_HARDEN_RELRO for
> example)? Then you should let PTXdist sort out these options for your kernel
> module. They are important for userland only. Refer the "kernel.make" rule
> file and the macro "*_WRAPPER_BLACKLIST". The same you need for your module
> rule file.

Thanks for the pointer!

TARGET_HARDEN_FORTIFY, TARGET_HARDEN_RELRO and TARGET_HARDEN_BINDNOW was 
activated which I was not aware about.


Best regards,
Matthias


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