From: Jan Beulich <jbeulich@suse.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>, Wei Liu <wl@xen.org>,
Konrad Wilk <konrad.wilk@oracle.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ilja Van Sprundel <ivansprundel@ioactive.com>,
Ian Jackson <ian.jackson@citrix.com>
Subject: [Xen-devel] [PATCH 4/6] sysctl: use xmalloc_array() for XEN_SYSCTL_page_offline_op
Date: Wed, 5 Feb 2020 14:16:29 +0100 [thread overview]
Message-ID: <4cf07838-40ff-a941-159a-263c9305b89d@suse.com> (raw)
In-Reply-To: <730add36-bfa0-e1bb-e2cb-b5570540688c@suse.com>
This is more robust than the raw xmalloc_bytes().
Also add a sanity check on the input page range.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -187,13 +187,17 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xe
uint32_t *status, *ptr;
mfn_t mfn;
+ ret = -EINVAL;
+ if ( op->u.page_offline.end < op->u.page_offline.start )
+ break;
+
ret = xsm_page_offline(XSM_HOOK, op->u.page_offline.cmd);
if ( ret )
break;
- ptr = status = xmalloc_bytes( sizeof(uint32_t) *
- (op->u.page_offline.end -
- op->u.page_offline.start + 1));
+ ptr = status = xmalloc_array(uint32_t,
+ (op->u.page_offline.end -
+ op->u.page_offline.start + 1));
if ( !status )
{
dprintk(XENLOG_WARNING, "Out of memory for page offline op\n");
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next prev parent reply other threads:[~2020-02-05 13:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-05 13:11 [Xen-devel] [PATCH 0/6] misc hardening and some cleanup Jan Beulich
2020-02-05 13:14 ` [Xen-devel] [PATCH 1/6] EFI: re-check {get, set}-variable name strings after copying in Jan Beulich
2020-02-05 13:14 ` [Xen-devel] [PATCH 2/6] EFI: don't leak heap contents through XEN_EFI_get_next_variable_name Jan Beulich
2020-02-05 13:15 ` [Xen-devel] [PATCH 3/6] xmalloc: guard against integer overflow Jan Beulich
2020-02-05 13:16 ` [Xen-devel] [PATCH 4/6] Arm/GICv2: don't needlessly use xzalloc_bytes() Jan Beulich
2020-02-05 14:29 ` Julien Grall
2020-02-05 13:16 ` Jan Beulich [this message]
2020-02-05 14:34 ` [Xen-devel] [PATCH 4/6] sysctl: use xmalloc_array() for XEN_SYSCTL_page_offline_op Julien Grall
2020-02-05 16:38 ` Jan Beulich
2020-02-05 17:15 ` Julien Grall
2020-02-05 13:17 ` [Xen-devel] [PATCH 6/6] domctl/vNUMA: avoid arithmetic overflow Jan Beulich
2020-02-05 15:13 ` Wei Liu
2020-02-05 13:19 ` [Xen-devel] [PATCH 0/6] misc hardening and some cleanup Jan Beulich
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