linux-kernel - [PATCH v2 2/2] efi/libstub: remove unnecessary cmd_line_len from efi_convert

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241013051239.22564-3-jonathan@marek.ca>
Date: Sun, 13 Oct 2024 01:11:57 -0400
From: Jonathan Marek <jonathan@...ek.ca>
To: linux-efi@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Kees Cook <kees@...nel.org>,
	Aditya Garg <gargaditya08@...e.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 2/2] efi/libstub: remove unnecessary cmd_line_len from efi_convert_cmdline()

efi_convert_cmdline() always sets cmdline_size to at least 1 on success,
so the "cmdline_size > 0" does nothing and can be removed (the intent was
to avoid parsing an empty string, but there is nothing wrong with parsing
an empty string, it is only making boot negligibly slower).

Then the cmd_line_len argument to efi_convert_cmdline can be removed
because there is nothing left using it.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/firmware/efi/libstub/efi-stub-helper.c | 3 +--
 drivers/firmware/efi/libstub/efi-stub.c        | 5 ++---
 drivers/firmware/efi/libstub/efistub.h         | 2 +-
 drivers/firmware/efi/libstub/x86-stub.c        | 3 +--
 4 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index de659f6a815fd..e7346f8edb38c 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -327,7 +327,7 @@ static efi_status_t efi_measure_tagged_event(unsigned long load_addr,
  * Size of memory allocated return in *cmd_line_len.
  * Returns NULL on error.
  */
-char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
+char *efi_convert_cmdline(efi_loaded_image_t *image)
 {
 	const efi_char16_t *options = efi_table_attr(image, load_options);
 	u32 options_size = efi_table_attr(image, load_options_size);
@@ -405,7 +405,6 @@ char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
 	snprintf((char *)cmdline_addr, options_bytes, "%.*ls",
 		 options_bytes - 1, options);
 
-	*cmd_line_len = options_bytes;
 	return (char *)cmdline_addr;
 }
 
diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
index 2a1b43f9e0fa2..f09e277ba2108 100644
--- a/drivers/firmware/efi/libstub/efi-stub.c
+++ b/drivers/firmware/efi/libstub/efi-stub.c
@@ -112,7 +112,6 @@ static u32 get_supported_rt_services(void)
 
 efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
 {
-	int cmdline_size = 0;
 	efi_status_t status;
 	char *cmdline;
 
@@ -121,7 +120,7 @@ efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
 	 * protocol. We are going to copy the command line into the
 	 * device tree, so this can be allocated anywhere.
 	 */
-	cmdline = efi_convert_cmdline(image, &cmdline_size);
+	cmdline = efi_convert_cmdline(image);
 	if (!cmdline) {
 		efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
 		return EFI_OUT_OF_RESOURCES;
@@ -137,7 +136,7 @@ efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
 		}
 	}
 
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
+	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
 		status = efi_parse_options(cmdline);
 		if (status != EFI_SUCCESS) {
 			efi_err("Failed to parse options\n");
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 685098f9626f2..76e44c185f29e 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -1056,7 +1056,7 @@ void efi_free(unsigned long size, unsigned long addr);
 
 void efi_apply_loadoptions_quirk(const void **load_options, u32 *load_options_size);
 
-char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len);
+char *efi_convert_cmdline(efi_loaded_image_t *image);
 
 efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
 				bool install_cfg_tbl);
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index f8e465da344d5..188c8000d245e 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -537,7 +537,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 	struct boot_params *boot_params;
 	struct setup_header *hdr;
-	int options_size = 0;
 	efi_status_t status;
 	unsigned long alloc;
 	char *cmdline_ptr;
@@ -569,7 +568,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 	hdr->initrd_addr_max = INT_MAX;
 
 	/* Convert unicode cmdline to ascii */
-	cmdline_ptr = efi_convert_cmdline(image, &options_size);
+	cmdline_ptr = efi_convert_cmdline(image);
 	if (!cmdline_ptr) {
 		efi_free(PARAM_SIZE, alloc);
 		efi_exit(handle, EFI_OUT_OF_RESOURCES);
-- 
2.45.1