Regarding getrandom syscall

[Avantika Rawat]

Hi All,

Thanks for the help

I was getting SYS_getrandom not defined compilation error as it is not
defined in my c libraries. Also now i am able to call getrandom
through syscall with proper syscall number which is arch dependent.
syscall (6314, buf, l , o);

On Wed, Jun 22, 2016 at 10:41 PM, Markus Böhme
<markus.boehme at mailbox.org> wrote:
> On 06/22/2016 04:58 PM, Avantika Rawat wrote:
>> Thanks for the link but i am getting "Function not implemented" error.
>> I have added a custom syscall in kernel for testing, getting similar
>> error for that also. I am working on  3.10.20 Kernel and MIPS
>> architecture. Pasting the kernel changes done to spport getrandom
>> syscall in 3.10.20 kernel. Can someone please help me here that what
>> needs to be done.
>
> If you're on MIPS, x86 code and syscall numbers won't help you. In this
> case the proper syscall numbers are defined in
> arch/mips/include/uapi/asm/unistd.h.
>
> Additionally, note that your kernel version does not seem to implement
> the getrandom syscall for MIPS:
>
>  $ git blame arch/mips/include/uapi/asm/unistd.h | grep getrandom
>  42944521 (Ralf Baechle  2014-08-26 03:03:40 +0200  376) #define
> __NR_getrandom                  (__NR_Linux + 353)
>  42944521 (Ralf Baechle  2014-08-26 03:03:40 +0200  716) #define
> __NR_getrandom                  (__NR_Linux + 313)
>  42944521 (Ralf Baechle  2014-08-26 03:03:40 +0200 1060) #define
> __NR_getrandom                  (__NR_Linux + 317)
>
>  $ git show 42944521 | head -n 5
>  commit 42944521af97a3b25516f15f3149aec3779656dc
>  Author: Ralf Baechle <ralf at linux-mips.org>
>  Date:   Tue Aug 26 03:03:40 2014 +0200
>
>      MIPS: Wire up new syscalls getrandom and memfd_create.
>
>  $ git show v3.10.20 | head -n 3
>  tag v3.10.20
>  Tagger: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
>  Date:   Wed Nov 20 12:28:06 2013 -0800
>
>
> Regards,
> Markus



-- 
Regards,
Avantika Rawat