Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [RFC] ptrace: add generic SET_SYSCALL request | Date | Fri, 07 Nov 2014 10:30:53 +0100 |
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On Friday 07 November 2014 16:47:23 AKASHI Takahiro wrote: > This patch adds a new generic ptrace request, PTRACE_SET_SYSCALL. > It can be used to change a system call number as follows: > ret = ptrace(pid, PTRACE_SET_SYSCALL, null, new_syscall_no); > 'new_syscall_no' can be -1 to skip this system call, you need to modify > a register's value, in arch-specific way, as return value though. > > Please note that we can't define PTRACE_SET_SYSCALL macro in > uapi/linux/ptrace.h partly because its value on arm, 23, is used as another > request on sparc. > > This patch also contains an example of change on arch side, arm. > Only syscall_set_nr() is required to be defined in asm/syscall.h. > > Currently only arm has this request, while arm64 would also have it > once my patch series of seccomp for arm64 is merged. It will also be > usable for most of other arches. > See the discussions in lak-ml: > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/300167.html > > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> >
Can you describe why you are moving the implementation? Is this a feature that we want to have on all architectures in the future? As you say, only arm32 implements is at the moment.
Arnd
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