Messages in this thread | | | Date | Fri, 7 Nov 2014 15:04:05 +0100 | From | Oleg Nesterov <> | Subject | Re: [RFC] ptrace: add generic SET_SYSCALL request |
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On 11/07, AKASHI Takahiro wrote: > > --- a/arch/arm/kernel/ptrace.c > +++ b/arch/arm/kernel/ptrace.c > @@ -853,11 +853,6 @@ long arch_ptrace(struct task_struct *child, long request, > datap); > break; > > - case PTRACE_SET_SYSCALL: > - task_thread_info(child)->syscall = data; > - ret = 0; > - break; > - > #ifdef CONFIG_CRUNCH > case PTRACE_GETCRUNCHREGS: > ret = ptrace_getcrunchregs(child, datap); > diff --git a/kernel/ptrace.c b/kernel/ptrace.c > index 54e7522..d7048fa 100644 > --- a/kernel/ptrace.c > +++ b/kernel/ptrace.c > @@ -1001,6 +1001,12 @@ int ptrace_request(struct task_struct *child, long request, > break; > } > #endif > + > +#ifdef PTRACE_SET_SYSCALL > + case PTRACE_SET_SYSCALL: > + ret = syscall_set_nr(child, task_pt_regs(child), data); > + break; > +#endif
I too do not understand why it makes sense to move PTRACE_SET_SYSCALL into the common kernel/ptrace.c.
To me the fact that PTRACE_SET_SYSCALL can be undefined and syscall_set_nr() is very much arch-dependant (but most probably trivial) means that this code should live in arch_ptrace().
In any case, I think it doesn't make sense to pass task_pt_regs(child), this helper can do this itself if it needs struct pt_regs.
Oleg.
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