[PATCH 7/7] powerpc/signal: Use unsafe_copy_siginfo_to_user()
From: Christophe Leroy <hidden>
Date: 2021-06-15 06:41:46
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
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. Signed-off-by: Christophe Leroy <redacted> --- 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 621de6e457b3..f3276cf05c8a 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c@@ -765,12 +765,6 @@ 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).
@@ -836,14 +830,19 @@ 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 35c301457fbf..47cf7462e0d6 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;
--
2.25.0