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NetworkPkg: UefiPxeBcDxe: Add EXCLUSIVE attribute when opening SNP protocol installed by PXE. 

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 <sriram-s@hpe.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wang Fan <fan.wang@intel.com>
Reviewed-by: Sriram Subramanian <sriram-s@hpe.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>
This commit is contained in:
edk2-devel-bounces@lists.01.org 2018-09-14 16:24:15 +08:00 committed by Jiaxin Wu
parent 16d8465756
commit cde5a72d36
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
NetworkPkg/UefiPxeBcDxe/PxeBcDriver.c
View File

@ -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;