From 06aae6834eb473c94a2493c145fc3e6c9fcf26a5 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sat, 30 Nov 2013 12:57:13 +0100 Subject: [PATCH] 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 Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/vdso.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index a84476f2a9bb..613649096783 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -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;