src/patches/suse-2.6.27.31/patches.arch/s390-08-04-compat-sigaltstack.diff

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: kernel: 31 bit compat sigaltstack syscall fails with -EFAULT.
   3 References: bnc#466462,LTC#50888
   4
   5 Symptom:     When 31 bit user space programs call sigaltstack on a 64 bit Linux
   6              OS, the system call returns -1 with errno=EFAULT.
   7 Problem:     The 31 bit pointer passed to the system call is extended
   8              to 64 bit, but the high order bits are not set to zero.
   9              The kernel detects the invalid user space pointer and
  10              returns -EFAULT.
  11 Solution:    Call sys32_sigaltstack_wrapper() instead of sys32_sigaltstack().
  12              The wrapper function sets the high order bits to zero.
  13
  14 Acked-by: John Jolly <jjolly@suse.de>
  15 ---
  16  arch/s390/kernel/syscalls.S |    2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 Index: linux-sles11/arch/s390/kernel/syscalls.S
  20 ===================================================================
  21 --- linux-sles11.orig/arch/s390/kernel/syscalls.S
  22 +++ linux-sles11/arch/s390/kernel/syscalls.S
  23 @@ -194,7 +194,7 @@ SYSCALL(sys_chown16,sys_ni_syscall,sys32
  24  SYSCALL(sys_getcwd,sys_getcwd,sys32_getcwd_wrapper)
  25  SYSCALL(sys_capget,sys_capget,sys32_capget_wrapper)
  26  SYSCALL(sys_capset,sys_capset,sys32_capset_wrapper)            /* 185 */
  27 -SYSCALL(sys_sigaltstack,sys_sigaltstack,sys32_sigaltstack)
  28 +SYSCALL(sys_sigaltstack,sys_sigaltstack,sys32_sigaltstack_wrapper)
  29  SYSCALL(sys_sendfile,sys_sendfile64,sys32_sendfile_wrapper)
  30  NI_SYSCALL                                                     /* streams1 */
  31  NI_SYSCALL                                                     /* streams2 */