From: Laurent Vivier <laurent@vivier.eu>
To: Andreas Krebbel <krebbel@linux.ibm.com>, qemu-devel@nongnu.org
Cc: qemu-s390x@nongnu.org, richard.henderson@linaro.org
Subject: Re: [PATCH v3] linux-user/s390x: Use the guest pointer for the sigreturn stub
Date: Thu, 25 Mar 2021 11:42:50 +0100 [thread overview]
Message-ID: <107c07f8-bf53-773b-e619-137e6487d8c5@vivier.eu> (raw)
In-Reply-To: <20210324185128.63971-1-krebbel@linux.ibm.com>
Le 24/03/2021 à 19:51, Andreas Krebbel a écrit :
> When setting up the pointer for the sigreturn stub in the return
> address register (r14) we currently use the host frame address instead
> of the guest frame address.
>
> Note: This only caused problems if Qemu has been built with
> --disable-pie (as it is in distros nowadays). Otherwise guest_base
> defaults to 0 hiding the actual problem.
>
> Signed-off-by: Andreas Krebbel <krebbel@linux.ibm.com>
> ---
> linux-user/s390x/signal.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c
> index ecfa2a14a9..7107c5fb53 100644
> --- a/linux-user/s390x/signal.c
> +++ b/linux-user/s390x/signal.c
> @@ -211,9 +211,10 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
> /* Set up to return from userspace. If provided, use a stub
> already in userspace. */
> if (ka->sa_flags & TARGET_SA_RESTORER) {
> - env->regs[14] = (unsigned long) ka->sa_restorer | PSW_ADDR_AMODE;
> + env->regs[14] = ka->sa_restorer | PSW_ADDR_AMODE;
> } else {
> - env->regs[14] = (unsigned long) frame->retcode | PSW_ADDR_AMODE;
> + env->regs[14] = (frame_addr + offsetof(typeof(*frame), retcode))
> + | PSW_ADDR_AMODE;
> __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
> (uint16_t *)(frame->retcode));
> }
>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
next prev parent reply other threads:[~2021-03-25 10:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-24 18:51 [PATCH v3] linux-user/s390x: Use the guest pointer for the sigreturn stub Andreas Krebbel
2021-03-25 10:42 ` Laurent Vivier [this message]
2021-03-25 12:46 ` Richard Henderson
2021-03-25 19:55 ` Laurent Vivier
2021-03-26 6:51 ` Andreas Krebbel
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