Re: [PATCHv9 4/5] sparc: Hook up execveat system call.

From: David Drysdale
Date: Thu Nov 20 2014 - 06:28:50 EST

On Wed, Nov 19, 2014 at 11:42 PM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> Hi David,
> On Wed, 19 Nov 2014 17:27:51 +0000 David Drysdale <drysdale@xxxxxxxxxx> wrote:
>> diff --git a/arch/sparc/kernel/systbls_64.S b/arch/sparc/kernel/systbls_64.S
>> index 580cde9370c9..15069cb35dac 100644
>> --- a/arch/sparc/kernel/systbls_64.S
>> +++ b/arch/sparc/kernel/systbls_64.S
>> @@ -88,6 +88,7 @@ sys_call_table32:
>> .word sys_syncfs, compat_sys_sendmmsg, sys_setns, compat_sys_process_vm_readv, compat_sys_process_vm_writev
>> /*340*/ .word sys_kern_features, sys_kcmp, sys_finit_module, sys_sched_setattr, sys_sched_getattr
>> .word sys32_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
>> +/*350*/ .word sys_execveat
> Shouldn't this be compat_sys_execveat?

Yeah, that would make sense -- thanks for spotting.

Looking at this more closely, I also wonder if we need a pair of wrappers
analogous to sys(32|64)_execve -- they include a (pipeline-executed)
flushw instruction after the jmpl to [compat_]sys_execve, which I guess
might be needed. So I could add something like the following to

set sys_execveat, %g1
jmpl %g1, %g0
set compat_sys_execveat, %g1
jmpl %g1, %g0

However, I don't speak SPARC and can't run the code -- any thoughts
out there from someone who does & can?

Or maybe I should stop trying to be helpful with speculative patches, and
just leave wiring up the sparc stuff to the experts...

>> #endif /* CONFIG_COMPAT */
> --
> Cheers,
> Stephen Rothwell sfr@xxxxxxxxxxxxxxxx
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