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Michael Brown 2ae5d43386 [efi] Raise TPL during driver entry point 
As per commit c89a446 ("[efi] Run at TPL_CALLBACK to protect against
UEFI timers") we expect to run at TPL_CALLBACK almost all of the time.
Various code paths rely on this assumption.  Code paths that need to
temporarily lower the TPL (e.g. for entropy gathering) will restore it
to TPL_CALLBACK.

The entropy gathering code will be run during DRBG initialisation,
which happens during the call to startup().  In the case of iPXE
compiled as an EFI application this code will run within the scope of
efi_snp_claim() and so will execute at TPL_CALLBACK as expected.

In the case of iPXE compiled as an EFI driver the code will
incorrectly run at TPL_APPLICATION since there is nothing within the
EFI driver entry point that raises (and restores) the TPL.  The net
effect is that a build that includes the entropy-gathering code
(e.g. a build with HTTPS enabled) will return from the driver entry
point at TPL_CALLBACK, which causes a system lockup.

Fix by raising and restoring the TPL within the EFI driver entry
point.

Debugged-by: Ignat Korchagin <ignat@cloudflare.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2020-06-30 16:45:48 +01:00
contrib [coverity] Override assumptions about wcrtomb() and hmac_init() 2019-08-17 17:18:54 +01:00
src [efi] Raise TPL during driver entry point 2020-06-30 16:45:48 +01:00
.travis.yml [travis] Ensure that most recent tag is always available 2020-01-03 00:14:03 +01:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org