ArmPkg/CpuDxe: ignore attribute changes during SyncCacheConfig()

To prevent the initial MMU->GCD memory space map synchronization from
stripping permissions attributes [which we cannot use in the GCD memory
space map, unfortunately], implement the same approach as x86, and ignore
SetMemoryAttributes() calls during the time SyncCacheConfig() is in
progress. This is a horrible hack, but is currently the only way we can
implement strict permissions on arbitrary memory regions [as opposed to
PE/COFF text/data sections only]

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel
2017-02-24 09:58:38 +00:00
parent c325e41585
commit 3b44bb5527
3 changed files with 8 additions and 0 deletions

View File

@@ -17,6 +17,7 @@
#include <Guid/IdleLoopEvent.h>
BOOLEAN mIsFlushingGCD;
/**
This function flushes the range of addresses from Start to Start+Length
@@ -261,7 +262,9 @@ CpuDxeInitialize (
// and that calls EFI_CPU_ARCH_PROTOCOL.SetMemoryAttributes, so this code needs to go
// after the protocol is installed
//
mIsFlushingGCD = TRUE;
SyncCacheConfig (&mCpu);
mIsFlushingGCD = FALSE;
// If the platform is a MPCore system then install the Configuration Table describing the
// secondary core states