[edk2-devel] [PATCH v2 1/1] SecurityPkg/DxeImageVerificationLib: Check result of GetEfiGlobalVariable2

[Gerd Hoffmann]

On Fri, Mar 03, 2023 at 11:35:53AM +0100, Gerd Hoffmann wrote:
> Call gRT->GetVariable() directly to read the SecureBoot variable.  It is
> one byte in size so we can easily place it on the stack instead of
> having GetEfiGlobalVariable2() allocate it for us, which avoids a few
> possible error cases.
> 
> Skip secure boot checks if (and only if):
> 
>  (a) the SecureBoot variable is not present (EFI_NOT_FOUND) according to
>      the return value, or
>  (b) the SecureBoot variable was read successfully and is set to
>      SECURE_BOOT_MODE_DISABLE.
> 
> Previously the code skipped the secure boot checks on *any*
> gRT->GetVariable() error (GetEfiGlobalVariable2 sets the variable
> value to NULL in that case) and also on memory allocation failures.
> 
> Fixes: CVE-2019-14560
> Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=2167
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>

Ping.  Any comments on this patch?

take care,
  Gerd



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