From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Oleg Nesterov <oleg@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Jan Kratochvil <jan.kratochvil@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/2] powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too
Date: Thu, 19 Nov 2020 18:18:23 +0100 [thread overview]
Message-ID: <4e132957-c53c-4b06-9546-26d1de0a672f@csgroup.eu> (raw)
In-Reply-To: <20201119160247.GB5188@redhat.com>
Le 19/11/2020 à 17:02, Oleg Nesterov a écrit :
> The commit a8a4b03ab95f ("powerpc: Hard wire PT_SOFTE value to 1 in
> ptrace & signals") changed ptrace_get_reg(PT_SOFTE) to report 0x1,
> but PTRACE_GETREGS still copies pt_regs->softe as is.
>
> This is not consistent and this breaks the user-regs-peekpoke test
> from https://sourceware.org/systemtap/wiki/utrace/tests/
>
> Reported-by: Jan Kratochvil <jan.kratochvil@redhat.com>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
> ---
> arch/powerpc/kernel/ptrace/ptrace-tm.c | 8 +++++++-
> arch/powerpc/kernel/ptrace/ptrace-view.c | 8 +++++++-
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-tm.c b/arch/powerpc/kernel/ptrace/ptrace-tm.c
> index f8fcbd85d4cb..d0d339f86e61 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-tm.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace-tm.c
> @@ -87,6 +87,10 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
> struct membuf to)
> {
> struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
> +#ifdef CONFIG_PPC64
> + struct membuf to_softe = membuf_at(&to,
> + offsetof(struct pt_regs, softe));
Should fit on a single line I think.
> +#endif
>
> if (!cpu_has_feature(CPU_FTR_TM))
> return -ENODEV;
> @@ -102,7 +106,9 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
> sizeof(struct user_pt_regs));
>
> membuf_store(&to_msr, get_user_ckpt_msr(target));
> -
> +#ifdef CONFIG_PPC64
> + membuf_store(&to_softe, 0x1ul);
> +#endif
> return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
> sizeof(struct user_pt_regs));
> }
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-view.c b/arch/powerpc/kernel/ptrace/ptrace-view.c
> index 39686ede40b3..f554ccfcbfae 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-view.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace-view.c
> @@ -218,6 +218,10 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
> struct membuf to)
> {
> struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
> +#ifdef CONFIG_PPC64
> + struct membuf to_softe = membuf_at(&to,
> + offsetof(struct pt_regs, softe));
Should fit on a single line I think.
> +#endif
> int i;
>
> if (target->thread.regs == NULL)
> @@ -233,7 +237,9 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
> sizeof(struct user_pt_regs));
>
> membuf_store(&to_msr, get_user_msr(target));
> -
> +#ifdef CONFIG_PPC64
> + membuf_store(&to_softe, 0x1ul);
> +#endif
> return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
> sizeof(struct user_pt_regs));
> }
>
Christophe
next prev parent reply other threads:[~2020-11-19 17:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 16:01 [PATCH v3 0/2] powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too Oleg Nesterov
2020-11-19 16:02 ` [PATCH v3 1/2] powerpc/ptrace: simplify gpr_get/tm_cgpr_get Oleg Nesterov
2020-11-19 17:16 ` Christophe Leroy
2020-11-19 18:18 ` Oleg Nesterov
2020-11-19 16:02 ` [PATCH v3 2/2] powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too Oleg Nesterov
2020-11-19 16:05 ` Oleg Nesterov
2020-11-19 17:18 ` Christophe Leroy [this message]
2020-11-19 21:10 ` Christophe Leroy
2020-11-19 22:43 ` Oleg Nesterov
2020-11-23 18:01 ` Oleg Nesterov
2020-11-24 0:53 ` Michael Ellerman
2020-11-19 17:19 ` [PATCH v3 0/2] " Christophe Leroy
2020-11-19 18:22 ` Oleg Nesterov
2020-12-10 11:30 ` Michael Ellerman
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