[PATCH v9 02/27] kallsyms: avoid hardcoding buffer size

Miguel Ojeda
2022-08-05T15:43:09Z

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

This introduces `KSYM_NAME_LEN_BUFFER` in place of the previously
hardcoded size of the input buffer.

It will also make it easier to update the size in a single place
in a later patch.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Co-developed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
scripts/kallsyms.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 52f5488c61bc..f3c5a2623f71 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -27,8 +27,14 @@

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))

+#define _stringify_1(x) #x
+#define _stringify(x) _stringify_1(x)
+
#define KSYM_NAME_LEN 128

+/* A substantially bigger size than the current maximum. */
+#define KSYM_NAME_LEN_BUFFER 499
+
struct sym_entry {
unsigned long long addr;
unsigned int len;
@@ -198,13 +204,13 @@ 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_BUFFER+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_BUFFER) "s\n", &addr, &type, name);
if (rc != 3) {
if (rc != EOF && fgets(name, sizeof(name), in) == NULL)
fprintf(stderr, "Read error or end of file.\n");
--
2.37.1