[PATCH 2/5] kallsyms: replace sprintf with scnprintf

[Maninder Singh]

replace sprintf API with scnprintf which prevents buffer overflow.

Co-developed-by: Onkarnath <onkarnat...@samsung.com>
Signed-off-by: Onkarnath <onkarnat...@samsung.com>
Signed-off-by: Maninder Singh <maninder...@samsung.com>
---
 kernel/kallsyms.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

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;
-- 
2.17.1