On Sat, 1 May 2021 at 01:43, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>
> Separate generating the signal from deciding it needs to be sent.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
> ---
> include/linux/sched/signal.h | 1 +
> kernel/events/core.c | 11 ++---------
> kernel/signal.c | 13 +++++++++++++
> 3 files changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
> index 7daa425f3055..1e2f61a1a512 100644
> --- a/include/linux/sched/signal.h
> +++ b/include/linux/sched/signal.h
> @@ -318,6 +318,7 @@ int send_sig_mceerr(int code, void __user *, short, struct task_struct *);
>
> int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper);
> int force_sig_pkuerr(void __user *addr, u32 pkey);
> +int force_sig_perf(void __user *addr, u32 type, u64 sig_data);
>
> int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno);
> int send_sig_fault_trapno(int sig, int code, void __user *addr, int trapno,
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 928b166d888e..48ea8863183b 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -6394,8 +6394,6 @@ void perf_event_wakeup(struct perf_event *event)
>
> static void perf_sigtrap(struct perf_event *event)
> {
> - struct kernel_siginfo info;
> -
> /*
> * We'd expect this to only occur if the irq_work is delayed and either
> * ctx->task or current has changed in the meantime. This can be the
> @@ -6410,13 +6408,8 @@ static void perf_sigtrap(struct perf_event *event)
> if (current->flags & PF_EXITING)
> return;
>
> - clear_siginfo(&info);
> - info.si_signo = SIGTRAP;
> - info.si_code = TRAP_PERF;
> - info.si_errno = event->attr.type;
> - info.si_perf = event->attr.sig_data;
> - info.si_addr = (void __user *)event->pending_addr;
> - force_sig_info(&info);
> + force_sig_perf((void __user *)event->pending_addr,
> + event->attr.type, event->attr.sig_data);
> }
>
> static void perf_pending_event_disable(struct perf_event *event)
> diff --git a/kernel/signal.c b/kernel/signal.c
> index 690921960d8b..5b1ad7f080ab 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1753,6 +1753,19 @@ int force_sig_pkuerr(void __user *addr, u32 pkey)
> }
> #endif
>
> +int force_sig_perf(void __user *pending_addr, u32 type, u64 sig_data)
s/pending_addr/addr/
to match force_sig_perf() declaration.
> +{
> + struct kernel_siginfo info;
> +
> + clear_siginfo(&info);
> + info.si_signo = SIGTRAP;
> + info.si_errno = type;
> + info.si_code = TRAP_PERF;
> + info.si_addr = pending_addr;
> + info.si_perf = sig_data;
> + return force_sig_info(&info);
> +}
> +
> #if IS_ENABLED(SPARC)
> int force_sig_fault_trapno(int sig, int code, void __user *addr, int trapno)
> {
> --
> 2.30.1
