Shim Reboot workaround #3
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Add a callback at the end of the Dxe phase that sets the "FB_NO_REBOOT" variable under the Shim GUID. This is a workaround for a boot loop in case a confidential guest that uses shim is booted with a vtpm device present. Signed-off-by: Oliver Steffen <[email protected]>
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REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4536 Bug Overview: PixieFail Bug coconut-svsm#3 CVE-2023-45231 CVSS 6.5 : CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CWE-125 Out-of-bounds Read Out-of-bounds read when handling a ND Redirect message with truncated options Change Overview: Adds a check to prevent truncated options from being parsed + // + // Cannot process truncated options. + // Cannot process options with a length of 0 as there is no Type field. + // + if (OptionLen < sizeof (IP6_OPTION_HEADER)) { + return FALSE; + } Cc: Saloni Kasbekar <[email protected]> Cc: Zachary Clark-williams <[email protected]> Signed-off-by: Doug Flick [MSFT] <[email protected]> Reviewed-by: Saloni Kasbekar <[email protected]>
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This patch does not impact functionality. It aims to clarify the synchronization flow between the BSP and APs to enhance code readability and understanding: Steps tianocore#6 and tianocore#11 are the basic synchronization requirements for all cases. Steps coconut-svsm#1 is additional requirements if the MmCpuSyncModeTradition mode is selected. Steps coconut-svsm#1, coconut-svsm#2, coconut-svsm#3, coconut-svsm#4, tianocore#5, tianocore#7, tianocore#8, tianocore#9, and tianocore#10 are additional requirements if the system needs to configure the MTRR. Steps tianocore#9 and tianocore#10 are additional requirements if the system needs to support the mSmmDebugAgentSupport. Signed-off-by: Jiaxin Wu <[email protected]>
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When booting a distro image that uses shim for the first time (via the removable media path),
shim will install itself as the default boot option and wants to reboot the machine.
This is annoying, since manual intervention is required, as reboots do not work under SNP.
Shim can be told to not reboot by setting an EFI variable.
Let's set this by default and never bother the user with reboots.
This is done via a code rather than pre-populating the OVMF image, since OVMF is using the
emulated in-ram variable store.