[2/5] kallsyms: replace sprintf with scnprintf

Commit Message

Maninder Singh May 20, 2022, 8:36 a.m. UTC

replace sprintf API with scnprintf which prevents buffer overflow.

Co-developed-by: Onkarnath <[e-mail]>
Signed-off-by: Onkarnath <[e-mail]>
Signed-off-by: Maninder Singh <[e-mail]>
---
 kernel/kallsyms.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Patch

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index f354378e241f..9e4316fe0ba1 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -472,28 +472,29 @@  static int __sprint_symbol(char *buffer, size_t buf_size, unsigned long address,
 	name = kallsyms_lookup_buildid(address, &size, &offset, &modname, &buildid,
 				       buffer);
 	if (!name)
-		return sprintf(buffer, "0x%lx", address - symbol_offset);
+		return scnprintf(buffer, buf_size, "0x%lx", address - symbol_offset);
 
 	if (name != buffer)
-		strcpy(buffer, name);
+		strncpy(buffer, name, buf_size);
+
 	len = strlen(buffer);
 	offset -= symbol_offset;
 
 	if (add_offset)
-		len += sprintf(buffer + len, "+%#lx/%#lx", offset, size);
+		len += scnprintf(buffer + len, buf_size - len, "+%#lx/%#lx", offset, size);
 
 	if (modname) {
-		len += sprintf(buffer + len, " [%s", modname);
+		len += scnprintf(buffer + len, buf_size - len, " [%s", modname);
 #if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
 		if (add_buildid && buildid) {
 			/* build ID should match length of sprintf */
 #if IS_ENABLED(CONFIG_MODULES)
 			static_assert(sizeof(typeof_member(struct module, build_id)) == 20);
 #endif
-			len += sprintf(buffer + len, " %20phN", buildid);
+			len += scnprintf(buffer + len, buf_size - len, " %20phN", buildid);
 		}
 #endif
-		len += sprintf(buffer + len, "]");
+		len += scnprintf(buffer + len, buf_size - len, "]");
 	}
 
 	return len;