From d362549bce92ac22860cda8cad4532c1a3fe6928 Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@suse.de>
Date: Mon, 20 Feb 2023 14:53:25 +0100
Subject: [PATCH 2/5] dmidecode: Write the whole dump file at once

When option --dump-bin is used, write the whole dump file at once,
instead of opening and closing the file separately for the table
and then for the entry point.

As the file writing function is no longer generic, it gets moved
from util.c to dmidecode.c.

One minor functional change resulting from the new implementation is
that the entry point is written first now, so the messages printed
are swapped.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jerry Hoemann <jerry.hoemann@hpe.com>

CVE: CVE-2023-30630

Upstream-Status: Backport [https://git.savannah.nongnu.org/cgit/dmidecode.git/commit/?id=d8cfbc808f387e87091c25e7d5b8c2bb348bb206]

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
---
 dmidecode.c | 69 +++++++++++++++++++++++++++++++++++++++--------------
 util.c      | 40 -------------------------------
 util.h      |  1 -
 3 files changed, 51 insertions(+), 59 deletions(-)

diff --git a/dmidecode.c b/dmidecode.c
index b082c03..a80a140 100644
--- a/dmidecode.c
+++ b/dmidecode.c
@@ -5130,11 +5130,56 @@ static void dmi_table_string(const struct dmi_header *h, const u8 *data, u16 ver
 	}
 }
 
-static void dmi_table_dump(const u8 *buf, u32 len)
+static int dmi_table_dump(const u8 *ep, u32 ep_len, const u8 *table,
+			  u32 table_len)
 {
+	FILE *f;
+
+	f = fopen(opt.dumpfile, "wb");
+	if (!f)
+	{
+		fprintf(stderr, "%s: ", opt.dumpfile);
+		perror("fopen");
+		return -1;
+	}
+
+	if (!(opt.flags & FLAG_QUIET))
+		pr_comment("Writing %d bytes to %s.", ep_len, opt.dumpfile);
+	if (fwrite(ep, ep_len, 1, f) != 1)
+	{
+		fprintf(stderr, "%s: ", opt.dumpfile);
+		perror("fwrite");
+		goto err_close;
+	}
+
+	if (fseek(f, 32, SEEK_SET) != 0)
+	{
+		fprintf(stderr, "%s: ", opt.dumpfile);
+		perror("fseek");
+		goto err_close;
+	}
+
 	if (!(opt.flags & FLAG_QUIET))
-		pr_comment("Writing %d bytes to %s.", len, opt.dumpfile);
-	write_dump(32, len, buf, opt.dumpfile, 0);
+		pr_comment("Writing %d bytes to %s.", table_len, opt.dumpfile);
+	if (fwrite(table, table_len, 1, f) != 1)
+	{
+		fprintf(stderr, "%s: ", opt.dumpfile);
+		perror("fwrite");
+		goto err_close;
+	}
+
+	if (fclose(f))
+	{
+		fprintf(stderr, "%s: ", opt.dumpfile);
+		perror("fclose");
+		return -1;
+	}
+
+	return 0;
+
+err_close:
+	fclose(f);
+	return -1;
 }
 
 static void dmi_table_decode(u8 *buf, u32 len, u16 num, u16 ver, u32 flags)
@@ -5387,11 +5432,7 @@ static int smbios3_decode(u8 *buf, const char *devmem, u32 flags)
 		memcpy(crafted, buf, 32);
 		overwrite_smbios3_address(crafted);
 
-		dmi_table_dump(table, len);
-		if (!(opt.flags & FLAG_QUIET))
-			pr_comment("Writing %d bytes to %s.", crafted[0x06],
-				   opt.dumpfile);
-		write_dump(0, crafted[0x06], crafted, opt.dumpfile, 1);
+		dmi_table_dump(crafted, crafted[0x06], table, len);
 	}
 	else
 	{
@@ -5463,11 +5504,7 @@ static int smbios_decode(u8 *buf, const char *devmem, u32 flags)
 		memcpy(crafted, buf, 32);
 		overwrite_dmi_address(crafted + 0x10);
 
-		dmi_table_dump(table, len);
-		if (!(opt.flags & FLAG_QUIET))
-			pr_comment("Writing %d bytes to %s.", crafted[0x05],
-				   opt.dumpfile);
-		write_dump(0, crafted[0x05], crafted, opt.dumpfile, 1);
+		dmi_table_dump(crafted, crafted[0x05], table, len);
 	}
 	else
 	{
@@ -5508,11 +5545,7 @@ static int legacy_decode(u8 *buf, const char *devmem, u32 flags)
 		memcpy(crafted, buf, 16);
 		overwrite_dmi_address(crafted);
 
-		dmi_table_dump(table, len);
-		if (!(opt.flags & FLAG_QUIET))
-			pr_comment("Writing %d bytes to %s.", 0x0F,
-				   opt.dumpfile);
-		write_dump(0, 0x0F, crafted, opt.dumpfile, 1);
+		dmi_table_dump(crafted, 0x0F, table, len);
 	}
 	else
 	{
diff --git a/util.c b/util.c
index 04aaadd..1547096 100644
--- a/util.c
+++ b/util.c
@@ -259,46 +259,6 @@ out:
 	return p;
 }
 
-int write_dump(size_t base, size_t len, const void *data, const char *dumpfile, int add)
-{
-	FILE *f;
-
-	f = fopen(dumpfile, add ? "r+b" : "wb");
-	if (!f)
-	{
-		fprintf(stderr, "%s: ", dumpfile);
-		perror("fopen");
-		return -1;
-	}
-
-	if (fseek(f, base, SEEK_SET) != 0)
-	{
-		fprintf(stderr, "%s: ", dumpfile);
-		perror("fseek");
-		goto err_close;
-	}
-
-	if (fwrite(data, len, 1, f) != 1)
-	{
-		fprintf(stderr, "%s: ", dumpfile);
-		perror("fwrite");
-		goto err_close;
-	}
-
-	if (fclose(f))
-	{
-		fprintf(stderr, "%s: ", dumpfile);
-		perror("fclose");
-		return -1;
-	}
-
-	return 0;
-
-err_close:
-	fclose(f);
-	return -1;
-}
-
 /* Returns end - start + 1, assuming start < end */
 u64 u64_range(u64 start, u64 end)
 {
diff --git a/util.h b/util.h
index 3094cf8..ef24eb9 100644
--- a/util.h
+++ b/util.h
@@ -27,5 +27,4 @@
 int checksum(const u8 *buf, size_t len);
 void *read_file(off_t base, size_t *len, const char *filename);
 void *mem_chunk(off_t base, size_t len, const char *devmem);
-int write_dump(size_t base, size_t len, const void *data, const char *dumpfile, int add);
 u64 u64_range(u64 start, u64 end);
-- 
2.41.0

