From: David Howells <dhowells@redhat.com>
To: lukas@wunner.de
Cc: dhowells@redhat.com, linux-efi@vger.kernel.org,
linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/6] arm/efi: Allow invocation of arbitrary runtime services [ver #2]
Date: Wed, 23 Nov 2016 09:34:03 +0000 [thread overview]
Message-ID: <5320.1479893643@warthog.procyon.org.uk> (raw)
In-Reply-To: <147986056324.13790.12670822944798392730.stgit@warthog.procyon.org.uk>
David Howells <dhowells@redhat.com> wrote:
> +#define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__)
Turns out it's not that simple - of course. runtime->get_variable is just a
void pointer. The old arm stub was casting it by virtue of assignment to a
function pointer variable.
The x86_64 appears to be doing bypassing all the compile-time type checking by
passing the arguments through an ellipsis and then fixing up the argument list
in the ->call() function.
What I've changed the ARM and ARM64 things to is:
#define efi_call_runtime(f, ...) ((efi_##f##_t *)sys_table_arg->runtime->f)(__VA_ARGS__)
David
next prev parent reply other threads:[~2016-11-23 9:34 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 0:22 [PATCH 0/6] efi: Pass secure boot mode to kernel [ver #2] David Howells
2016-11-23 0:22 ` [PATCH 1/6] x86/efi: Allow invocation of arbitrary runtime services " David Howells
2016-11-23 0:22 ` [PATCH 2/6] arm/efi: " David Howells
2016-11-23 9:34 ` David Howells [this message]
2016-11-23 10:35 ` Ard Biesheuvel
2016-11-23 11:51 ` David Howells
2016-11-23 10:27 ` Mark Rutland
2016-11-23 11:46 ` David Howells
2016-11-23 13:38 ` Mark Rutland
2016-11-23 0:22 ` [PATCH 3/6] efi: Add SHIM and image security database GUID definitions " David Howells
2016-11-23 0:22 ` [PATCH 4/6] efi: Get the secure boot status " David Howells
2016-11-23 9:31 ` Lukas Wunner
2016-11-23 9:53 ` David Howells
2016-11-23 10:10 ` Lukas Wunner
2016-11-23 10:47 ` Mark Rutland
2016-11-23 11:25 ` David Howells
2016-11-23 13:42 ` Mark Rutland
2016-11-23 14:13 ` David Howells
2016-11-23 14:24 ` Mark Rutland
2016-11-23 14:55 ` David Howells
2016-11-29 18:11 ` Matthew Garrett
2016-11-30 16:51 ` David Howells
2016-11-23 0:23 ` [PATCH 5/6] efi: Disable secure boot if shim is in insecure mode " David Howells
2016-11-23 13:38 ` Mark Rutland
2016-11-23 0:23 ` [PATCH 6/6] efi: Add EFI_SECURE_BOOT bit " David Howells
2016-11-23 9:27 ` Lukas Wunner
2016-11-23 10:07 ` David Howells
2016-11-23 10:09 ` David Howells
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