Christophe Leroy <christophe.le...@csgroup.eu> writes:
> Use unsafe_copy_siginfo_to_user() in order to do the copy
> within the user access block.
>
> On an mpc 8321 (book3s/32) the improvment is about 5% on a process
> sending a signal to itself.
Nacked-by: "Eric W. Biederman" <ebied...@xmission.com>
copy_siginfo_to_user is not the same as copy_siginfo_to_user32.
As in this patch breaks 32bit userspace on powerpc.
> Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
> ---
> arch/powerpc/kernel/signal_32.c | 13 ++++++-------
> arch/powerpc/kernel/signal_64.c | 5 +----
> 2 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
> index ff101e2b3bab..f9e16d108bc8 100644
> --- a/arch/powerpc/kernel/signal_32.c
> +++ b/arch/powerpc/kernel/signal_32.c
> @@ -710,12 +710,6 @@ static long restore_tm_user_regs(struct pt_regs *regs,
> struct mcontext __user *s
> }
> #endif
>
> -#ifdef CONFIG_PPC64
> -
> -#define copy_siginfo_to_user copy_siginfo_to_user32
> -
> -#endif /* CONFIG_PPC64 */
> -
> /*
> * Set up a signal frame for a "real-time" signal handler
> * (one which gets siginfo).
> @@ -779,14 +773,19 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t
> *oldset,
> asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0]));
> }
> unsafe_put_sigset_t(&frame->uc.uc_sigmask, oldset, failed);
> +#ifndef CONFIG_COMPAT
> + unsafe_copy_siginfo_to_user(&frame->info, &ksig->info, failed);
> +#endif
>
> /* create a stack frame for the caller of the handler */
> unsafe_put_user(regs->gpr[1], newsp, failed);
>
> user_access_end();
>
> - if (copy_siginfo_to_user(&frame->info, &ksig->info))
> +#ifdef CONFIG_COMPAT
> + if (copy_siginfo_to_user32(&frame->info, &ksig->info))
> goto badframe;
> +#endif
>
> regs->link = tramp;
>
> diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
> index 2cca6c8febe1..82b73fbd937d 100644
> --- a/arch/powerpc/kernel/signal_64.c
> +++ b/arch/powerpc/kernel/signal_64.c
> @@ -901,15 +901,12 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t
> *set,
> }
>
> unsafe_copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set),
> badframe_block);
> + unsafe_copy_siginfo_to_user(&frame->info, &ksig->info, badframe_block);
> /* Allocate a dummy caller frame for the signal handler. */
> unsafe_put_user(regs->gpr[1], newsp, badframe_block);
>
> user_write_access_end();
>
> - /* Save the siginfo outside of the unsafe block. */
> - if (copy_siginfo_to_user(&frame->info, &ksig->info))
> - goto badframe;
> -
> /* Make sure signal handler doesn't get spurious FP exceptions */
> tsk->thread.fp_state.fpscr = 0;
