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Commit 06aae683 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 8cb04be8

arch/s390/kernel/vdso.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -125,7 +125,7 @@ int vdso_alloc_per_cpu(struct _lowcore *lowcore) 
		psal[i] = 0x80000000;

		psal[i] = 0x80000000;





	lowcore->paste[4] = (u32)(addr_t) psal;

	lowcore->paste[4] = (u32)(addr_t) psal;

	psal[0] = 0x20000000;

	psal[0] = 0x02000000;

	psal[2] = (u32)(addr_t) aste;

	psal[2] = (u32)(addr_t) aste;

	*(unsigned long *) (aste + 2) = segment_table +

	*(unsigned long *) (aste + 2) = segment_table +

		_ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;

		_ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;