[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1397644322-13905-43-git-send-email-luis.henriques@canonical.com>
Date: Wed, 16 Apr 2014 11:31:58 +0100
From: Luis Henriques <luis.henriques@...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,
Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 42/46] sparc64: don't treat 64-bit syscall return codes as 32-bit
3.11.10.8 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Kleikamp <dave.kleikamp@...cle.com>
commit 1535bd8adbdedd60a0ee62e28fd5225d66434371 upstream.
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: Luis Henriques <luis.henriques@...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 73ec8a7..c79c687 100644
--- a/arch/sparc/kernel/syscalls.S
+++ b/arch/sparc/kernel/syscalls.S
@@ -189,7 +189,8 @@ 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
@@ -217,7 +218,6 @@ 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists