From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> commit f93274ef0fe972c120c96b3207f8fce376231a60 upstream. The function derive_pub_key() should be calling memzero_explicit() instead of memset() in case the complier decides to optimize away the call to memset() because it "knows" no one is going to touch the memory anymore. Cc: stable <stable@xxxxxxxxxxxxxxx> Reported-by: Ilil Blum Shem-Tov <ilil.blum.shem-tov@xxxxxxxxx> Tested-by: Ilil Blum Shem-Tov <ilil.blum.shem-tov@xxxxxxxxx> Link: https://lore.kernel.org/r/X8ns4AfwjKudpyfe@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- crypto/asymmetric_keys/asym_tpm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/crypto/asymmetric_keys/asym_tpm.c +++ b/crypto/asymmetric_keys/asym_tpm.c @@ -354,7 +354,7 @@ static uint32_t derive_pub_key(const voi memcpy(cur, e, sizeof(e)); cur += sizeof(e); /* Zero parameters to satisfy set_pub_key ABI. */ - memset(cur, 0, SETKEY_PARAMS_SIZE); + memzero_explicit(cur, SETKEY_PARAMS_SIZE); return cur - buf; }
