tree e40a6ceee197a48f6d15fce4bf4d62225e76a1ff
parent 03e4c49f847f23c62900424f65a62f76de5a7151
author Michael Holzheu <holzheu@linux.vnet.ibm.com> 1232725224 +0100
committer Heiko Carstens <heiko.carstens@de.ibm.com> 1232725228 +0100

[S390] fix compat sigaltstack syscall table entry

When 31 bit user space programs call sigaltstack on a 64 bit Linux
OS, the system call returns -1 with errno=EFAULT. 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. To solve the problem, sys32_sigaltstack_wrapper()
instead of sys32_sigaltstack() has to be called. The wrapper function sets
the high order bits to zero.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>