With glibc 2.33 (Ubuntu package glibc6 2.33-0ubuntu9) building sifive_unmatched_defconfig results in:

In file included from /usr/include/stdio.h:866, from ././include/compiler.h:26, from <command-line>: In function ‘snprintf’, inlined from ‘rsa_engine_get_priv_key’ at ./tools/../^:273:4: /usr/include/riscv64-linux-gnu/bits/stdio2.h:71:10: warning: ‘%s’ directive argument is null [-Wformat-truncation=] 71 | return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 72 | __glibc_objsize (__s), __fmt, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 73 | __va_arg_pack ()); | ~~~~~~~~~~~~~~~~~

Avoid passing a NULL string.

Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- lib/rsa/rsa-sign.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/rsa/rsa-sign.c b/lib/rsa/rsa-sign.c index 085dc89bf7..c7ae7a0dbc 100644 --- a/lib/rsa/rsa-sign.c +++ b/lib/rsa/rsa-sign.c @@ -271,8 +271,7 @@ static int rsa_engine_get_priv_key(const char *keydir, const char *name, keydir, name); else if (keydir) snprintf(key_id, sizeof(key_id), - "%s", - name); + "%s", name ? name : ""); else if (keyfile) snprintf(key_id, sizeof(key_id), "%s", keyfile); else