From e9a4e9d563ea643d305b5fe83031d7deca311db3 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Fri, 23 Jan 2009 16:40:24 +0100 Subject: [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 Signed-off-by: Heiko Carstens diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S index 76d16e0..3e18d8a 100644 --- a/arch/s390/kernel/syscalls.S +++ b/arch/s390/kernel/syscalls.S @@ -194,7 +194,7 @@ SYSCALL(sys_chown16,sys_ni_syscall,sys32_chown16_wrapper) /* old chown16 syscall 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 */ -- cgit v0.10.2