tree 61ceddb80062cae529b9c5a34cdf7a07566f1a30
parent ea2a4d3a3a929ef494952bba57a0ef1a8a877881
author Gerald Schaefer <gerald.schaefer@de.ibm.com> 1254818054 +0200
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1254818110 +0200

[S390] Add EX_TABLE for addressing exception in usercopy functions.

This patch adds an EX_TABLE entry to mvc{p|s|os} usercopy functions that
may be called with KERNEL_DS. In combination with collaborative memory
management, kernel pages marked as unused may trigger an adressing exception
in the usercopy functions. This fixes an unhandled addressing exception bug
where strncpy_from_user() is used with len > strnlen and KERNEL_DS, crossing
a page boundary to an unused page.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>