linux-kernel - Re: [PATCH v5 22/25] syscall_get_arch: add "struct task

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Date:   Mon, 10 Dec 2018 09:29:45 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Burton <paul.burton@...s.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 22/25] syscall_get_arch: add "struct task_struct *" argument

On Sun, Dec 9, 2018 at 8:31 PM Dmitry V. Levin <ldv@...linux.org> wrote:
>
> This argument is required to extend the generic ptrace API with
> PTRACE_GET_SYSCALL_INFO request: syscall_get_arch() is going
> to be called from ptrace_request() along with syscall_get_nr(),
> syscall_get_arguments(), syscall_get_error(), and
> syscall_get_return_value() functions with a tracee as their argument.
>
> Reverts: 5e937a9ae913 ("syscall_get_arch: remove useless function arguments")
> Reverts: 1002d94d3076 ("syscall.h: fix doc text for syscall_get_arch()")
> Reviewed-by: Andy Lutomirski <luto@...nel.org> # for x86
> Reviewed-by: Palmer Dabbelt <palmer@...ive.com>
> Acked-by: Paul Burton <paul.burton@...s.com> # MIPS parts
> Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

For the seccomp parts:

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> diff --git a/kernel/seccomp.c b/kernel/seccomp.c
> index f2ae2324c232..77cb87bd2eae 100644
> --- a/kernel/seccomp.c
> +++ b/kernel/seccomp.c
> @@ -82,7 +82,7 @@ static void populate_seccomp_data(struct seccomp_data *sd)
>         unsigned long args[6];
>
>         sd->nr = syscall_get_nr(task, regs);
> -       sd->arch = syscall_get_arch();
> +       sd->arch = syscall_get_arch(task);
>         syscall_get_arguments(task, regs, 0, 6, args);
>         sd->args[0] = args[0];
>         sd->args[1] = args[1];
> @@ -529,7 +529,7 @@ static void seccomp_init_siginfo(kernel_siginfo_t *info, int syscall, int reason
>         info->si_code = SYS_SECCOMP;
>         info->si_call_addr = (void __user *)KSTK_EIP(current);
>         info->si_errno = reason;
> -       info->si_arch = syscall_get_arch();
> +       info->si_arch = syscall_get_arch(current);
>         info->si_syscall = syscall;
>  }
>
> --
> ldv



-- 
Kees Cook