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Subject[REVIEW][PATCH 03/17] signal/sh: Use force_sig_fault in hw_breakpoint_handler
The call chain is:
breakpoint
notify_die
hw_breakpoint_exceptions_notify
hw_breakpoint_handler

So the signal number can only be SIGTRAP.

In hw_breakpoint_handler rc is either NOTIFY_STOP or NOTIF_DONE
both of which notifier_to_errno converts to 0. So si_errno is 0.

Historically si_addr was left unitialized in struct siginfo which is a
bug. There appears to be no consensus among the various architectures
which value should be in si_addr. So since no usable value has
been returned up to this point return NULL in si_addr.

Fixes: 4352fc1b12fa ("sh: Abstracted SH-4A UBC support on hw-breakpoint core.")
Fixes: 34d0b5af50a0 ("sh: Convert ptrace to hw_breakpoint API.")
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/sh/kernel/hw_breakpoint.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/sh/kernel/hw_breakpoint.c b/arch/sh/kernel/hw_breakpoint.c
index afe965712a69..8648ed05ccf0 100644
--- a/arch/sh/kernel/hw_breakpoint.c
+++ b/arch/sh/kernel/hw_breakpoint.c
@@ -347,13 +347,8 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)

/* Deliver the signal to userspace */
if (!arch_check_bp_in_kernelspace(bp)) {
- siginfo_t info;
-
- info.si_signo = args->signr;
- info.si_errno = notifier_to_errno(rc);
- info.si_code = TRAP_HWBKPT;
-
- force_sig_info(args->signr, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_HWBKPT,
+ (void __user *)NULL, current);
}

rcu_read_unlock();
--
2.14.1
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