linux-kernel - [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do

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Date:   Thu, 19 Apr 2018 20:03:56 -0500
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-arch@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Vincent Chen <vincentc@...estech.com>,
        Greentime Hu <greentime@...estech.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do_revisn

As originally committed do_revisn would deliver a siginfo for SIGILL
with an si_code composed of random stack contents.  That makes no
sense and is not something userspace can depend on.  So simplify
the code and just use "force_sig(SIG_ILL, current)" instead.

Fixes: 2923f5ea7738 ("nds32: Exception handling")
Cc: Vincent Chen <vincentc@...estech.com>
Cc: Greentime Hu <greentime@...estech.com>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/nds32/kernel/traps.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
index 65961bf91d64..8e9a5b1f6234 100644
--- a/arch/nds32/kernel/traps.c
+++ b/arch/nds32/kernel/traps.c
@@ -356,14 +356,11 @@ void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
 
 void do_revinsn(struct pt_regs *regs)
 {
-	siginfo_t si;
 	pr_emerg("Reserved Instruction\n");
 	show_regs(regs);
 	if (!user_mode(regs))
 		do_exit(SIGILL);
-	si.si_signo = SIGILL;
-	si.si_errno = 0;
-	force_sig_info(SIGILL, &si, current);
+	force_sig(SIGILL, current);
 }
 
 #ifdef CONFIG_ALIGNMENT_TRAP
-- 
2.14.1