Fix oinkmaster patch.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.39 / patches.arch / s390-08-04-compat-sigaltstack.diff

From: Gerald Schaefer <geraldsc@de.ibm.com>
Subject: kernel: 31 bit compat sigaltstack syscall fails with -EFAULT.
References: bnc#466462,LTC#50888

Symptom:     When 31 bit user space programs call sigaltstack on a 64 bit Linux
             OS, the system call returns -1 with errno=EFAULT.
Problem:     The 31 bit pointer passed to the system call is extended
             to 64 bit, but the high order bits are not set to zero.
             The kernel detects the invalid user space pointer and
             returns -EFAULT.
Solution:    Call sys32_sigaltstack_wrapper() instead of sys32_sigaltstack().
             The wrapper function sets the high order bits to zero.

Acked-by: John Jolly <jjolly@suse.de>
---
 arch/s390/kernel/syscalls.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-sles11/arch/s390/kernel/syscalls.S
===================================================================
--- linux-sles11.orig/arch/s390/kernel/syscalls.S
+++ linux-sles11/arch/s390/kernel/syscalls.S
@@ -194,7 +194,7 @@ SYSCALL(sys_chown16,sys_ni_syscall,sys32
 SYSCALL(sys_getcwd,sys_getcwd,sys32_getcwd_wrapper)
 SYSCALL(sys_capget,sys_capget,sys32_capget_wrapper)
 SYSCALL(sys_capset,sys_capset,sys32_capset_wrapper)		/* 185 */
-SYSCALL(sys_sigaltstack,sys_sigaltstack,sys32_sigaltstack)
+SYSCALL(sys_sigaltstack,sys_sigaltstack,sys32_sigaltstack_wrapper)
 SYSCALL(sys_sendfile,sys_sendfile64,sys32_sendfile_wrapper)
 NI_SYSCALL							/* streams1 */
 NI_SYSCALL							/* streams2 */