linux-kernel - [REVIEW][PATCH 03/26] signal/arm64: Use force_sig not force_sig

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Date:   Wed, 22 May 2019 19:38:53 -0500
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>, linux-arch@...r.kernel.org,
        Dave Martin <Dave.Martin@....com>,
        James Morse <james.morse@....com>,
        Will Deacon <will.deacon@....com>
Subject: [REVIEW][PATCH 03/26] signal/arm64: Use force_sig not force_sig_fault for SIGKILL

It really only matters to debuggers but the SIGKILL does not have any
si_codes that use the fault member of the siginfo union.  Correct this
the simple way and call force_sig instead of force_sig_fault when the
signal is SIGKILL.

Cc: stable@...r.kernel.org
Cc: Dave Martin <Dave.Martin@....com>
Cc: James Morse <james.morse@....com>
Cc: Will Deacon <will.deacon@....com>
Fixes: af40ff687bc9 ("arm64: signal: Ensure si_code is valid for all fault signals")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/arm64/kernel/traps.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index ade32046f3fe..0feb17bdcaa0 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -282,6 +282,11 @@ void arm64_notify_die(const char *str, struct pt_regs *regs,
 		current->thread.fault_address = 0;
 		current->thread.fault_code = err;
 
+		if (signo == SIGKILL) {
+			arm64_show_signal(signo, str);
+			force_sig(signo, current);
+			return;
+		}
 		arm64_force_sig_fault(signo, sicode, addr, str);
 	} else {
 		die(str, regs, err);
-- 
2.21.0