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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2012-07-26 10:53:06 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-07-26 18:24:14 +0400
commit0f6f281b731d20bfe75c13f85d33f3f05b440222 (patch)
tree0f8c23d3fca50dd2830ddc978501cd45a0057f45 /arch/s390/include/asm/processor.h
parent8143adafd2d00b13f1db96ce06b6bf479e0bfe5b (diff)
downloadlinux-0f6f281b731d20bfe75c13f85d33f3f05b440222.tar.xz
s390/mm: downgrade page table after fork of a 31 bit process
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>
Diffstat (limited to 'arch/s390/include/asm/processor.h')
-rw-r--r--arch/s390/include/asm/processor.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index c40fa91e38a8..11e4e3236937 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -120,7 +120,9 @@ struct stack_frame {
regs->psw.mask = psw_user_bits | PSW_MASK_BA; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
+ __tlb_flush_mm(current->mm); \
crst_table_downgrade(current->mm, 1UL << 31); \
+ update_mm(current->mm, current); \
} while (0)
/* Forward declaration, a strange C thing */