linux-kernel - [PATCH RFC 4/4] firmware_loader: Use uts

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Date: Wed, 31 Jan 2024 10:48:51 +0000
From: John Garry <john.g.garry@...cle.com>
To: mcgrof@...nel.org, russ.weight@...ux.dev, gregkh@...uxfoundation.org,
        rafael@...nel.org, rostedt@...dmis.org, mhiramat@...nel.org,
        mathieu.desnoyers@...icios.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        keescook@...omium.org, masahiroy@...nel.org, nathan@...nel.org,
        nicolas@...sle.eu
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kbuild@...r.kernel.org,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC 4/4] firmware_loader: Use uts_release

Instead of using UTS_RELEASE, use uts_release, which means that we don't
need to rebuild the code just for the git head commit changing.

Since UTS_RELEASE was used for fw_path and this points to const data,
append uts_release dynamically to an intermediate string.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 drivers/base/firmware_loader/main.c | 39 +++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index ea28102d421e..87da7be61a29 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -38,7 +38,7 @@
 #include <linux/zstd.h>
 #include <linux/xz.h>
 
-#include <generated/utsrelease.h>
+#include <linux/utsname.h>
 
 #include "../base.h"
 #include "firmware.h"
@@ -471,9 +471,9 @@ static int fw_decompress_xz(struct device *dev, struct fw_priv *fw_priv,
 static char fw_path_para[256];
 static const char * const fw_path[] = {
 	fw_path_para,
-	"/lib/firmware/updates/" UTS_RELEASE,
+	"/lib/firmware/updates/", /* UTS_RELEASE is appended later */
 	"/lib/firmware/updates",
-	"/lib/firmware/" UTS_RELEASE,
+	"/lib/firmware/", /* UTS_RELEASE is appended later */
 	"/lib/firmware"
 };
 
@@ -496,7 +496,7 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 	size_t size;
 	int i, len, maxlen = 0;
 	int rc = -ENOENT;
-	char *path, *nt = NULL;
+	char *path, *fw_path_string, *nt = NULL;
 	size_t msize = INT_MAX;
 	void *buffer = NULL;
 
@@ -510,6 +510,12 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 	if (!path)
 		return -ENOMEM;
 
+	fw_path_string = __getname();
+	if (!fw_path_string) {
+		__putname(path);
+		return -ENOMEM;
+	}
+
 	wait_for_initramfs();
 	for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
 		size_t file_size = 0;
@@ -519,16 +525,32 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 		if (!fw_path[i][0])
 			continue;
 
+		len = snprintf(fw_path_string, PATH_MAX, "%s", fw_path[i]);
+		if (len >= PATH_MAX) {
+			rc = -ENAMETOOLONG;
+			break;
+		}
+
+		/* Special handling to append UTS_RELEASE */
+		if (fw_path[i][len - 1] == '/') {
+			len = snprintf(fw_path_string, PATH_MAX, "%s%s",
+					fw_path[i], uts_release);
+			if (len >= PATH_MAX) {
+				rc = -ENAMETOOLONG;
+				break;
+			}
+		}
+
 		/* strip off \n from customized path */
-		maxlen = strlen(fw_path[i]);
+		maxlen = strlen(fw_path_string);
 		if (i == 0) {
-			nt = strchr(fw_path[i], '\n');
+			nt = strchr(fw_path_string, '\n');
 			if (nt)
-				maxlen = nt - fw_path[i];
+				maxlen = nt - fw_path_string;
 		}
 
 		len = snprintf(path, PATH_MAX, "%.*s/%s%s",
-			       maxlen, fw_path[i],
+			       maxlen, fw_path_string,
 			       fw_priv->fw_name, suffix);
 		if (len >= PATH_MAX) {
 			rc = -ENAMETOOLONG;
@@ -585,6 +607,7 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 		break;
 	}
 	__putname(path);
+	__putname(fw_path_string);
 
 	return rc;
 }
-- 
2.35.3