linux-kernel - [PATCH] platform/x86: thinkpad_acpi: replace deprecated strncpy with memcpy

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Message-ID: <20231020-strncpy-drivers-platform-x86-thinkpad_acpi-c-v1-1-312f2e33034f@google.com>
Date:   Fri, 20 Oct 2023 17:52:43 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Kees Cook <keescook@...omium.org>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Hans de Goede <hdegoede@...hat.com>,
        "Ilpo Järvinen" <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>
Cc:     ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] platform/x86: thinkpad_acpi: replace deprecated strncpy with memcpy

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous
interfaces.

We expect ec_fw_string to be NUL-terminated based on its use with format
strings in thinkpad_acpi.c:
11241 | pr_notice("ThinkPad firmware release %s doesn't match the known patterns\n",
11242 |     ec_fw_string);

Moreover, NUL-padding is not required since ec_fw_string is explicitly
zero-initialized:
11185 | char ec_fw_string[18] = {0};

When carefully copying bytes from one buffer to another in
pre-determined blocks (like what's happening here with dmi_data):

|       static void find_new_ec_fwstr(const struct dmi_header *dm, void *private)
|       {
|       	char *ec_fw_string = (char *) private;
|       	const char *dmi_data = (const char *)dm;
|       	/*
|       	 * ThinkPad Embedded Controller Program Table on newer models
|       	 *
|       	 * Offset |  Name                | Width  | Description
|       	 * ----------------------------------------------------
|       	 *  0x00  | Type                 | BYTE   | 0x8C
|       	 *  0x01  | Length               | BYTE   |
|       	 *  0x02  | Handle               | WORD   | Varies
|       	 *  0x04  | Signature            | BYTEx6 | ASCII for "LENOVO"
|       	 *  0x0A  | OEM struct offset    | BYTE   | 0x0B
|       	 *  0x0B  | OEM struct number    | BYTE   | 0x07, for this structure
|       	 *  0x0C  | OEM struct revision  | BYTE   | 0x01, for this format
|       	 *  0x0D  | ECP version ID       | STR ID |
|       	 *  0x0E  | ECP release date     | STR ID |
|       	 */
|
|       	/* Return if data structure not match */
|       	if (dm->type != 140 || dm->length < 0x0F ||
|       	memcmp(dmi_data + 4, "LENOVO", 6) != 0 ||
|       	dmi_data[0x0A] != 0x0B || dmi_data[0x0B] != 0x07 ||
|       	dmi_data[0x0C] != 0x01)
|       		return;
|
|       	/* fwstr is the first 8byte string  */
|       	strncpy(ec_fw_string, dmi_data + 0x0F, 8);

... we shouldn't be using a C string api. Let's instead use memcpy() as
this more properly relays the intended behavior.

Do note that ec_fw_string will still end up being NUL-terminated since
we are memcpy'ing only 8 bytes into a buffer full of 18 zeroes. There's
still some trailing NUL-bytes there. To ensure this behavior, let's add
a BUILD_BUG_ON checking the length leaves space for at least one
trailing NUL-byte.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Note: build-tested only.

Found with: $ rg "strncpy\("
---
 drivers/platform/x86/thinkpad_acpi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 41584427dc32..bd9e06f5b860 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -11144,6 +11144,8 @@ static char __init tpacpi_parse_fw_id(const char * const s,
 	return '\0';
 }
 
+#define EC_FW_STRING_LEN 18
+
 static void find_new_ec_fwstr(const struct dmi_header *dm, void *private)
 {
 	char *ec_fw_string = (char *) private;
@@ -11172,7 +11174,8 @@ static void find_new_ec_fwstr(const struct dmi_header *dm, void *private)
 		return;
 
 	/* fwstr is the first 8byte string  */
-	strncpy(ec_fw_string, dmi_data + 0x0F, 8);
+	BUILD_BUG_ON(EC_FW_STRING_LEN <= 8);
+	memcpy(ec_fw_string, dmi_data + 0x0F, 8);
 }
 
 /* returns 0 - probe ok, or < 0 - probe error.
@@ -11182,7 +11185,7 @@ static int __must_check __init get_thinkpad_model_data(
 						struct thinkpad_id_data *tp)
 {
 	const struct dmi_device *dev = NULL;
-	char ec_fw_string[18] = {0};
+	char ec_fw_string[EC_FW_STRING_LEN] = {0};
 	char const *s;
 	char t;
 

---
base-commit: dab3e01664eaddae965699f1fec776609db0ea9d
change-id: 20231019-strncpy-drivers-platform-x86-thinkpad_acpi-c-7a733d087ef7

Best regards,
--
Justin Stitt <justinstitt@...gle.com>