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Date: Mon, 20 Sep 2021 18:42:50 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Alexander Egorenkov <egorenar@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ibm.com>, Vasily Gorbik <gor@...ux.ibm.com> Subject: [PATCH 5.14 032/168] s390/sclp: fix Secure-IPL facility detection From: Alexander Egorenkov <egorenar@...ux.ibm.com> commit d76b14f3971a0638b6cd0da289f8b48acee287d0 upstream. Prevent out-of-range access if the returned SCLP SCCB response is smaller in size than the address of the Secure-IPL flag. Fixes: c9896acc7851 ("s390/ipl: Provide has_secure sysfs attribute") Cc: stable@...r.kernel.org # 5.2+ Signed-off-by: Alexander Egorenkov <egorenar@...ux.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com> Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/s390/char/sclp_early.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/s390/char/sclp_early.c +++ b/drivers/s390/char/sclp_early.c @@ -45,13 +45,14 @@ static void __init sclp_early_facilities sclp.has_gisaf = !!(sccb->fac118 & 0x08); sclp.has_hvs = !!(sccb->fac119 & 0x80); sclp.has_kss = !!(sccb->fac98 & 0x01); - sclp.has_sipl = !!(sccb->cbl & 0x4000); if (sccb->fac85 & 0x02) S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; if (sccb->fac91 & 0x40) S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; if (sccb->cpuoff > 134) sclp.has_diag318 = !!(sccb->byte_134 & 0x80); + if (sccb->cpuoff > 137) + sclp.has_sipl = !!(sccb->cbl & 0x4000); sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; sclp.rzm <<= 20;
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