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s390/vdso: fix access-list entry initialization 

The access-list entry is supposed to have the fetch-only bit set, however
a reserved bit got set instead.
Userspace isn't able to write to the page anyway since the accessed page
has the read-only bit set. So this saves us only for bad surprises in the
future if the reserved bit gets used.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-11-30 12:57:13 +01:00 committed by Martin Schwidefsky
parent 8cb04be886
commit 06aae6834e
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/vdso.c
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@ -125,7 +125,7 @@ int vdso_alloc_per_cpu(struct _lowcore *lowcore)
psal[i] = 0x80000000;
lowcore->paste[4] = (u32)(addr_t) psal;
psal[0] = 0x20000000;
psal[0] = 0x02000000;
psal[2] = (u32)(addr_t) aste;
*(unsigned long *) (aste + 2) = segment_table +
_ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;