From 1f2c35936d1731da26c3ed8d002785240853a742 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Wed, 7 Nov 2018 11:25:57 +0100 Subject: [PATCH] NetworkPkg: UefiPxeBcDxe: Add EXCLUSIVE attribute when opening SNP protocol installed by PXE. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Message-id: <20181107102557.9106-2-lersek@redhat.com> Patchwork-id: 82937 O-Subject: [RHEL8 edk2 PATCH 1/1] NetworkPkg: UefiPxeBcDxe: Add EXCLUSIVE attribute when opening SNP protocol installed by PXE. Bugzilla: 1643377 Acked-by: Vitaly Kuznetsov Acked-by: Philippe Mathieu-Daudé From: "edk2-devel-bounces@lists.01.org" --v-- RHEL8 note start --v-- Please see the analysis for this backport in through . There was a trivial conflict to resolve while cherry-picking the upstream commit; please refer to . --^-- RHEL8 note end --^-- Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1152 v2: Sync the same logic to Ipv6 and update code comments. The PXE driver installs a SNP and open this SNP with attribute BY_DRIVER to avoid it being opened by MNP driver, this SNP is also expected not to be opened by other drivers with EXCLUSIVE attribute. In some cases, other drivers may happen to do this by error, and thus cause a system crash. This patch adds EXCLUSIVE attribute when opening SNP in PXE driver, and will reject all OpenProtocol requests by EXCLUSIVE. Cc: Subramanian, Sriram Cc: Ye Ting Cc: Fu Siyuan Cc: Wu Jiaxin Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Wang Fan Reviewed-by: Sriram Subramanian Reviewed-by: Fu Siyuan Reviewed-by: Wu Jiaxin (cherry picked from commit cde5a72d365eff5b02b8330fef1c8d36fced08eb) Signed-off-by: Laszlo Ersek --- NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c index 8dd787b..437cd6f 100644 --- a/NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c +++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c @@ -814,7 +814,7 @@ PxeBcCreateIp4Children ( } // - // Open SNP on the child handle BY_DRIVER. It will prevent any additionally + // Open SNP on the child handle BY_DRIVER|EXCLUSIVE. It will prevent any additionally // layering to perform the experiment. // Status = gBS->OpenProtocol ( @@ -823,7 +823,7 @@ PxeBcCreateIp4Children ( (VOID **) &Snp, This->DriverBindingHandle, Private->Ip4Nic->Controller, - EFI_OPEN_PROTOCOL_BY_DRIVER + EFI_OPEN_PROTOCOL_BY_DRIVER|EFI_OPEN_PROTOCOL_EXCLUSIVE ); if (EFI_ERROR (Status)) { goto ON_ERROR; @@ -1157,7 +1157,7 @@ PxeBcCreateIp6Children ( } // - // Open SNP on the child handle BY_DRIVER. It will prevent any additionally + // Open SNP on the child handle BY_DRIVER|EXCLUSIVE. It will prevent any additionally // layering to perform the experiment. // Status = gBS->OpenProtocol ( @@ -1166,7 +1166,7 @@ PxeBcCreateIp6Children ( (VOID **) &Snp, This->DriverBindingHandle, Private->Ip6Nic->Controller, - EFI_OPEN_PROTOCOL_BY_DRIVER + EFI_OPEN_PROTOCOL_BY_DRIVER|EFI_OPEN_PROTOCOL_EXCLUSIVE ); if (EFI_ERROR (Status)) { goto ON_ERROR; -- 1.8.3.1