linux-kernel - [PATCH 3.16 120/202] mips: Use sigsp()

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Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Richard Weinberger" <richard@....at>
Subject: [PATCH 3.16 120/202] mips: Use sigsp()

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit 7c4f563507c33ca97dcfbd62dba1e9232575d499 upstream.

Use sigsp() instead of the open coded variant.

Signed-off-by: Richard Weinberger <richard@....at>
[bwh: Backported to 3.16 as dependency of commit 35634ffa1751
 "signal: Always notice exiting tasks"]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/kernel/signal.c     | 10 ++++------
 arch/mips/kernel/signal32.c   |  4 ++--
 arch/mips/kernel/signal_n32.c |  2 +-
 3 files changed, 7 insertions(+), 9 deletions(-)

--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -280,7 +280,7 @@ int restore_sigcontext(struct pt_regs *r
 	return err;
 }
 
-void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
 			  size_t frame_size)
 {
 	unsigned long sp;
@@ -295,9 +295,7 @@ void __user *get_sigframe(struct k_sigac
 	 */
 	sp -= 32;
 
-	/* This is the X/Open sanctioned signal stack switching.  */
-	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
-		sp = current->sas_ss_sp + current->sas_ss_size;
+	sp = sigsp(sp, ksig);
 
 	return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
 }
@@ -434,7 +432,7 @@ static int setup_frame(void *sig_return,
 	struct sigframe __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
 		return -EFAULT;
 
@@ -473,7 +471,7 @@ static int setup_rt_frame(void *sig_retu
 	struct rt_sigframe __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
 		return -EFAULT;
 
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -494,7 +494,7 @@ static int setup_frame_32(void *sig_retu
 	struct sigframe32 __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
 		return -EFAULT;
 
@@ -534,7 +534,7 @@ static int setup_rt_frame_32(void *sig_r
 	struct rt_sigframe32 __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
 		return -EFAULT;
 
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -108,7 +108,7 @@ static int setup_rt_frame_n32(void *sig_
 	struct rt_sigframe_n32 __user *frame;
 	int err = 0;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
 	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
 		return -EFAULT;