linux-kernel - [PATCH 3.8 027/133] sparc64: don't treat 64-bit syscall return codes as 32-bit

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Message-Id: <1398197671-12786-28-git-send-email-kamal@canonical.com>
Date:	Tue, 22 Apr 2014 13:12:45 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dave Kleikamp <dave.kleikamp@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 027/133] sparc64: don't treat 64-bit syscall return codes as 32-bit

3.8.13.22 -stable review patch.  If anyone has any objections, please let me know.

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

From: Dave Kleikamp <dave.kleikamp@...cle.com>

[ Upstream commit 1535bd8adbdedd60a0ee62e28fd5225d66434371 ]

When checking a system call return code for an error,
linux_sparc_syscall was sign-extending the lower 32-bit value and
comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return
codes whose lower 32-bits alone would indicate a failure (such as 4G-1).
Use the whole 64-bit value to check for errors. Only the 32-bit path
should sign extend the lower 32-bit value.

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Acked-by: Bob Picco <bob.picco@...cle.com>
Acked-by: Allen Pais <allen.pais@...cle.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/sparc/kernel/syscalls.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S
index dc7b524..d654e9f 100644
--- a/arch/sparc/kernel/syscalls.S
+++ b/arch/sparc/kernel/syscalls.S
@@ -195,7 +195,8 @@ linux_sparc_syscall32:
 	 mov	%i0, %l5				! IEU1
 5:	call	%l7					! CTI	Group brk forced
 	 srl	%i5, 0, %o5				! IEU1
-	ba,a,pt	%xcc, 3f
+	ba,pt	%xcc, 3f
+	 sra	%o0, 0, %o0
 
 	/* Linux native system calls enter here... */
 	.align	32
@@ -223,7 +224,6 @@ linux_sparc_syscall:
 3:	stx	%o0, [%sp + PTREGS_OFF + PT_V9_I0]
 ret_sys_call:
 	ldx	[%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
-	sra	%o0, 0, %o0
 	mov	%ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
 	sllx	%g2, 32, %g2
 
-- 
1.9.1

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