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test_firmware: Test platform fw loading on non-EFI systems

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On non-EFI systems, it wasn't possible to test the platform firmware
loader because it will have never set "checked_fw" during __init.
Instead, allow the test code to override this check. Additionally split
the declarations into a private header file so it there is greater
enforcement of the symbol visibility.

Fixes: 548193cba2 ("test_firmware: add support for firmware_request_platform")
Cc: stable@vger.kernel.org
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20200724213640.389191-2-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook
2020-07-24 14:36:22 -07:00
committed by Greg Kroah-Hartman
parent 90b109d50d
commit 2d38dbf89a
4 changed files with 41 additions and 19 deletions
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5
lib/test_firmware.c
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@@ -489,6 +489,7 @@ out:
static DEVICE_ATTR_WO(trigger_request);
#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
#include "../drivers/firmware/efi/embedded-firmware.h"
static ssize_t trigger_request_platform_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -501,6 +502,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
};
struct efi_embedded_fw efi_embedded_fw;
const struct firmware *firmware = NULL;
bool saved_efi_embedded_fw_checked;
char *name;
int rc;
@@ -513,6 +515,8 @@ static ssize_t trigger_request_platform_store(struct device *dev,
efi_embedded_fw.data = (void *)test_data;
efi_embedded_fw.length = sizeof(test_data);
list_add(&efi_embedded_fw.list, &efi_embedded_fw_list);
saved_efi_embedded_fw_checked = efi_embedded_fw_checked;
efi_embedded_fw_checked = true;
pr_info("loading '%s'\n", name);
rc = firmware_request_platform(&firmware, name, dev);
@@ -530,6 +534,7 @@ static ssize_t trigger_request_platform_store(struct device *dev,
rc = count;
out:
efi_embedded_fw_checked = saved_efi_embedded_fw_checked;
release_firmware(firmware);
list_del(&efi_embedded_fw.list);
kfree(name);