Fix errors in the simple output protocol which may lead to providing incorrect values for columns or rows.
Allowing to set an illegal screen mode has led to an illegal memory access in the UEFI SCT.
For reference:
As the illegal memory access led to QEMU stopping the following patch for Linux has been proposed. With the patch QEMU does not stop but hands the error back to U-Boot which than outputs the relative position in the loaded UEFI binary or in U-Boot (in this case SetMem16() called by AppendStringToHistory() of EDK2's ConsoleLogger).
KVM: inject data abort if instruction cannot be decoded https://lkml.org/lkml/2019/9/4/1488
Heinrich Schuchardt (2): efi_loader: cursor positioning efi_loader: do not set invalid screen mode
lib/efi_loader/efi_console.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
-- 2.23.0.rc1