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OvmfPkg: LoadLinuxLib: Zero kernel parameters instead of passing garbage 

We're supposed to zero everything in the kernel bootparams that we don't
explicitly initialise, other than the setup_header from 0x1f1 onwards
for a precisely defined length, which is copied from the bzImage.

We're *not* supposed to just pass the garbage that we happened to find
in the bzImage file surrounding the setup_header.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14052 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten 2013-01-16 06:49:45 +00:00
parent 38851e781d
commit c61a56f208
3 changed files with 55 additions and 2 deletions
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22
OvmfPkg/Include/Library/LoadLinuxLib.h
View File

@ -1,7 +1,7 @@
/** @file
Load/boot UEFI Linux.
Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -94,6 +94,26 @@ LoadLinuxAllocateKernelSetupPages (
);
/**
Clears the uninitialised space before and after the struct setup_header
in the kernel setup image. The kernel requires that these be zeroed
unless explicitly initialised, so this function should be called after
the setup_header has been copied in from a bzImage, before setting up
anything else.
@param[in] KernelSetup - The kernel setup image
@retval EFI_SUCCESS - The Linux kernel setup was successfully initialized
@retval EFI_INVALID_PARAMETER - KernelSetup was NULL
@retval EFI_UNSUPPORTED - The Linux kernel is not supported
**/
EFI_STATUS
EFIAPI
LoadLinuxInitializeKernelSetup (
IN VOID *KernelSetup
);
/**
Allocates pages for the kernel.

28
OvmfPkg/Library/LoadLinuxLib/Linux.c
View File

@ -119,6 +119,34 @@ LoadLinuxAllocateKernelSetupPages (
}
}
EFI_STATUS
EFIAPI
LoadLinuxInitializeKernelSetup (
IN VOID *KernelSetup
)
{
EFI_STATUS Status;
UINTN SetupEnd;
struct boot_params *Bp;
Status = BasicKernelSetupCheck (KernelSetup);
if (EFI_ERROR (Status)) {
return Status;
}
Bp = (struct boot_params*) KernelSetup;
SetupEnd = 0x202 + (Bp->hdr.jump & 0xff);
//
// Clear all but the setup_header
//
ZeroMem (KernelSetup, 0x1f1);
ZeroMem (((UINT8 *)KernelSetup) + SetupEnd, 4096 - SetupEnd);
DEBUG ((EFI_D_INFO, "Cleared kernel setup 0-0x1f1, 0x%x-0x1000\n", SetupEnd));
return EFI_SUCCESS;
}
VOID*
EFIAPI

7
OvmfPkg/Library/PlatformBdsLib/QemuKernel.c
View File

@ -1,6 +1,6 @@
/** @file
Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -78,6 +78,11 @@ TryRunningQemuKernel (
goto FreeAndReturn;
}
Status = LoadLinuxInitializeKernelSetup (SetupBuf);
if (EFI_ERROR (Status)) {
goto FreeAndReturn;
}
KernelInitialSize = LoadLinuxGetKernelSize (SetupBuf, KernelSize);
if (KernelInitialSize == 0) {
Status = EFI_UNSUPPORTED;