linux-kernel - [PATCH 5.8 19/70] fs/kernel_read_file: Remove FIRMWARE_EFI

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Date:   Sat, 31 Oct 2020 12:35:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Scott Branden <scott.branden@...adcom.com>
Subject: [PATCH 5.8 19/70] fs/kernel_read_file: Remove FIRMWARE_EFI_EMBEDDED enum

From: Kees Cook <keescook@...omium.org>

commit 06e67b849ab910a49a629445f43edb074153d0eb upstream.

The "FIRMWARE_EFI_EMBEDDED" enum is a "where", not a "what". It
should not be distinguished separately from just "FIRMWARE", as this
confuses the LSMs about what is being loaded. Additionally, there was
no actual validation of the firmware contents happening.

Fixes: e4c2c0ff00ec ("firmware: Add new platform fallback mechanism and firmware_request_platform()")
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
Acked-by: Scott Branden <scott.branden@...adcom.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20201002173828.2099543-3-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/firmware_loader/fallback_platform.c |    2 +-
 include/linux/fs.h                               |    1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/base/firmware_loader/fallback_platform.c
+++ b/drivers/base/firmware_loader/fallback_platform.c
@@ -17,7 +17,7 @@ int firmware_fallback_platform(struct fw
 	if (!(opt_flags & FW_OPT_FALLBACK_PLATFORM))
 		return -ENOENT;
 
-	rc = security_kernel_load_data(LOADING_FIRMWARE_EFI_EMBEDDED);
+	rc = security_kernel_load_data(LOADING_FIRMWARE);
 	if (rc)
 		return rc;
 
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3011,7 +3011,6 @@ extern int do_pipe_flags(int *, int);
 	id(UNKNOWN, unknown)		\
 	id(FIRMWARE, firmware)		\
 	id(FIRMWARE_PREALLOC_BUFFER, firmware)	\
-	id(FIRMWARE_EFI_EMBEDDED, firmware)	\
 	id(MODULE, kernel-module)		\
 	id(KEXEC_IMAGE, kexec-image)		\
 	id(KEXEC_INITRAMFS, kexec-initramfs)	\