From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-180.mta1.migadu.com (out-180.mta1.migadu.com [95.215.58.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BF41A2EA480 for ; Sun, 18 Jan 2026 17:31:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768757469; cv=none; b=hYrrxfb5gNEXj/8wxA4tpIMeqxZ6y4hr7PgGI/+1VdLilnFhPTOSkTTueQ9P7bXEHms/pmI4yBPVRCw+0mz0HZniWC/NOWRIlECN5pr4JUWfnUpWk9HXvrJW1R1krVizohh8aKlrsmcBERMDwiy4XOT3bJkaicSHE7PJGgcdw+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768757469; c=relaxed/simple; bh=6upfWbetZHz5HGSfXXcr9QHTVnjmO7VFbdjmon2KzYw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=nPnvXz23qJXFigrXoTc9wxiHu+MTXtBGda+R62m3N0+eY2JrSrfkIaq+9lwBV/5XPzuki4fk/ssO2UEFa41pfqzHlaFN/b1PM5eaqO+UtX2wfCeMlz8XL4wxmJBGAe/fyaOvRINSmojkUmyi2y54Tv2Dck06cUx0DkajNxGGZlQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=PL3O5eVL; arc=none smtp.client-ip=95.215.58.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="PL3O5eVL" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1768757460; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=UmV6YKo20duzncK88GsUbRYcSlJ16WsHBt5OyoKzpug=; b=PL3O5eVLZQGsL7BimLk15RZoVPWvV/RI6le4APkk1azBCYO7HiiHJ3rlI+TVaMqxDggvyq FXqbKu6JaJMq9DyA/xmZmHYZCmHHj8p/LJLenuBH1VVmSTeN/+Juc3FBtB3JFozw4wkg/r MfOVpdoXOl+u6zvjcxpN2F6glRYMuos= From: Thorsten Blum To: Tyler Hicks , Thorsten Blum , Eric Biggers , Christian Brauner , Ard Biesheuvel , Baolin Liu , Slark Xiao Cc: ecryptfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ecryptfs: Replace memcpy + manual NUL termination with strscpy Date: Sun, 18 Jan 2026 18:30:49 +0100 Message-ID: <20260118173055.1197250-1-thorsten.blum@linux.dev> Precedence: bulk X-Mailing-List: ecryptfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Use strscpy() to copy the NUL-terminated '->token.password.signature' and 'sig' to the destination buffers instead of using memcpy() followed by manual NUL terminations. Signed-off-by: Thorsten Blum --- fs/ecryptfs/debug.c | 5 ++--- fs/ecryptfs/keystore.c | 6 ++---- 2 files changed, 4 insertions(+), 7 deletions(-) diff --git a/fs/ecryptfs/debug.c b/fs/ecryptfs/debug.c index cf6d0e8e25a1..006ab871cda9 100644 --- a/fs/ecryptfs/debug.c +++ b/fs/ecryptfs/debug.c @@ -7,6 +7,7 @@ * Author(s): Michael A. Halcrow */ +#include #include "ecryptfs_kernel.h" /* @@ -34,9 +35,7 @@ void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok) ECRYPTFS_PERSISTENT_PASSWORD) { ecryptfs_printk(KERN_DEBUG, " * persistent\n"); } - memcpy(sig, auth_tok->token.password.signature, - ECRYPTFS_SIG_SIZE_HEX); - sig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; + strscpy(sig, auth_tok->token.password.signature); ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig); } ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n", diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index bbf8603242fa..a615489e5a17 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -2457,8 +2457,7 @@ int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig) if (!new_key_sig) return -ENOMEM; - memcpy(new_key_sig->keysig, sig, ECRYPTFS_SIG_SIZE_HEX); - new_key_sig->keysig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; + strscpy(new_key_sig->keysig, sig); /* Caller must hold keysig_list_mutex */ list_add(&new_key_sig->crypt_stat_list, &crypt_stat->keysig_list); @@ -2478,9 +2477,8 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, if (!new_auth_tok) return -ENOMEM; - memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX); + strscpy(new_auth_tok->sig, sig); new_auth_tok->flags = global_auth_tok_flags; - new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); list_add(&new_auth_tok->mount_crypt_stat_list, &mount_crypt_stat->global_auth_tok_list); -- Thorsten Blum GPG: 1D60 735E 8AEF 3BE4 73B6 9D84 7336 78FD 8DFE EAD4