s390/mm: downgrade page table after fork of a 31 bit process

Browse source

The downgrade of the 4 level page table created by init_new_context is
currently done only in start_thread31. If a 31 bit process forks the
new mm uses a 4 level page table, including the task size of 2<<42
that goes along with it. This is incorrect as now a 31 bit process
can map memory beyond 2GB. Define arch_dup_mmap to do the downgrade
after fork.

Cc: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

...

This commit is contained in:

Martin Schwidefsky 2012-07-26 08:53:06 +02:00

parent 8143adafd2

commit 0f6f281b73

4 changed files with 25 additions and 8 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

14

arch/s390/include/asm/mmu_context.h

View file

2

arch/s390/include/asm/processor.h

View file

12

arch/s390/mm/mmap.c

View file

5

arch/s390/mm/pgtable.c

View file