tree 4a689fbb465d7302b105678152170d8665f56ae7
parent 6cec50838ed04a9833fb5549f698d3756bbe7e72
author Roland McGrath <roland@redhat.com> 1233970447 -0800
committer Roland McGrath <roland@redhat.com> 1233970447 -0800

elf core dump: fix get_user use

The elf_core_dump() code does its work with set_fs(KERNEL_DS) in force,
so vma_dump_size() needs to switch back with set_fs(USER_DS) to safely
use get_user() for a normal user-space address.

Checking for VM_READ optimizes out the case where get_user() would fail
anyway.  The vm_file check here was already superfluous given the control
flow earlier in the function, so that is a cleanup/optimization unrelated
to other changes but an obvious and trivial one.

Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Roland McGrath <roland@redhat.com>