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client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="sergey.dyasli@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: TqQkzmi9JuPNn7Gy/JzerQopbW+J7Eg/HSvyodqgKwy6liyt49GclLM2WQADT6NXTl/kZ1p9du CB4UFLD6ASxEzL/NopyZoPRTvUJtMdivzl3aoQZxabTiYizCWjwv79t8XuBMkzX7EwggzZ5f7f akop21WbU3fEBVEfVMqKZd4pJlcm3cFSfFwHD9lr0HEnFYtOObpdUw54kRdENEoSPEmA10/AUG I/1BaEq0Xz7pvyfyQ5KUeoqXtJZyfi9TrJLmDoPbTN07bw6Li+uwoY0bWydcCWLSGwnyQoo4SG iuU= X-SBRS: 2.7 X-MesageID: 11004133 X-Ironport-Server: esa5.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.69,410,1571716800"; d="scan'208";a="11004133" From: Sergey Dyasli To: , , , Date: Wed, 8 Jan 2020 15:20:59 +0000 Message-ID: <20200108152100.7630-4-sergey.dyasli@citrix.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200108152100.7630-1-sergey.dyasli@citrix.com> References: <20200108152100.7630-1-sergey.dyasli@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v1 3/4] xen: teach KASAN about grant tables X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Sergey Dyasli , Stefano Stabellini , George Dunlap , Ross Lagerwall , Alexander Potapenko , Andrey Ryabinin , Boris Ostrovsky , Andrew Morton , Dmitry Vyukov Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" From: Ross Lagerwall Otherwise it produces lots of false positives when a guest starts using PV I/O devices. Signed-off-by: Ross Lagerwall Signed-off-by: Sergey Dyasli --- RFC --> v1: - Slightly clarified the commit message --- drivers/xen/grant-table.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 7b36b51cdb9f..ce95f7232de6 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -1048,6 +1048,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, foreign = xen_page_foreign(pages[i]); foreign->domid = map_ops[i].dom; foreign->gref = map_ops[i].ref; + kasan_alloc_pages(pages[i], 0); break; } @@ -1084,8 +1085,10 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, if (ret) return ret; - for (i = 0; i < count; i++) + for (i = 0; i < count; i++) { ClearPageForeign(pages[i]); + kasan_free_pages(pages[i], 0); + } return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count); }