linux-kernel - [PATCH v3 03/19] kallsyms: use the correct buffer size for symbols

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Date:   Mon, 17 Jan 2022 06:33:33 +0100
From:   Miguel Ojeda <ojeda@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     rust-for-linux@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH v3 03/19] kallsyms: use the correct buffer size for symbols

From: Boqun Feng <boqun.feng@...il.com>

The buffered name size should be larger than `KSYM_NAME_LEN`, otherwise
we cannot tell whether the size of a symbol name is too long.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 scripts/kallsyms.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 72ba0fe4e43b..0e37c19d84af 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -27,6 +27,9 @@
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
+#define _stringify_1(x)	#x
+#define _stringify(x)	_stringify_1(x)
+
 #define KSYM_NAME_LEN		512
 
 struct sym_entry {
@@ -197,15 +200,15 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
 
 static struct sym_entry *read_symbol(FILE *in)
 {
-	char name[500], type;
+	char name[KSYM_NAME_LEN+1], type;
 	unsigned long long addr;
 	unsigned int len;
 	struct sym_entry *sym;
 	int rc;
 
-	rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
+	rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN) "s\n", &addr, &type, name);
 	if (rc != 3) {
-		if (rc != EOF && fgets(name, 500, in) == NULL)
+		if (rc != EOF && fgets(name, KSYM_NAME_LEN + 1, in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
 	}
-- 
2.34.1