From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 5DB25231829; Tue, 21 Jul 2026 22:29:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672985; cv=none; b=VgMWsMerq+V8Fh+tyRuwV6fS2y+eQg6MRFsDPaP9O7/EqCzw3P1RaSivRfJyoOLayisuc9bs1Lv06dQeNbmO4bzqkJtntQXURSMzcuDuPOOmy8xuMeh3Pr8ovESme9fn9M0oU1fH66eGJojooVy6Y2sw+r+nyUzhBLAGbGDlyIA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672985; c=relaxed/simple; bh=uTlIGcJRpxulW/nnm65l4+Aj9LA70nzNXRjRdZ613XU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EeHhNcMGwakYm94ozvvHnJdPwVt53dhQr7mlnfqctCofzfWwYvJ5shEHVm2EKzRDTURe/TOktEuHOZcvuh9atNUlXZxDFV1pKA4mco4MDcrhb3jqG9oPnoJmY50984dUJTyAK5Z++Mbsvr1l1LkoiFgS+ZUD7aLJu1tHprQAAUI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZYdjBajP; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZYdjBajP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE0D91F000E9; Tue, 21 Jul 2026 22:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672984; bh=yfJE4c5HRZxU98gxPBg3wVoSx4jd3GWOCJj17Xuci00=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZYdjBajPI1YN10+87WAjX2kgDjV0apDWmfCTLpCqVK5SYk5Ww6Ha+lF2WXmV3vUkn lQCaAfZAeXrtxGCYxxPyr9rnN9MBuc0/teOmE8MiDyDWfW7W/w+OwPqW1cg0SLrOBo iTAjRM5I7UBafo/WzJNz24wNdVkjQAnaZetoazig= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Richard Guy Briggs , Ricardo Robaina , Paul Moore , Sasha Levin Subject: [PATCH 5.15 832/843] audit: fix potential integer overflow in audit_log_n_hex() Date: Tue, 21 Jul 2026 17:27:47 +0200 Message-ID: <20260721152424.796757284@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ricardo Robaina [ Upstream commit 65dfde57d1e29ce2b76fc23dd565eccd5c0bc0f0 ] The function calculates new_len as len << 1 for hex encoding. This has two overflow risks: the shift itself can overflow when len is large, and the result can be truncated when assigned to new_len (declared as int) from the size_t calculation. Fix by using check_shl_overflow() to catch shift overflow and changing new_len and loop counter i to size_t to prevent truncation. Cc: stable@vger.kernel.org Fixes: 168b7173959f ("AUDIT: Clean up logging of untrusted strings") Reviewed-by: Richard Guy Briggs Signed-off-by: Ricardo Robaina [PM: remove vertical whitspace noise] Signed-off-by: Paul Moore Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- kernel/audit.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- a/kernel/audit.c +++ b/kernel/audit.c @@ -61,6 +61,7 @@ #include #include #include +#include #include "audit.h" @@ -2037,7 +2038,8 @@ void audit_log_format(struct audit_buffe void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, size_t len) { - int i, avail, new_len; + int avail; + size_t i, new_len; unsigned char *ptr; struct sk_buff *skb; @@ -2047,7 +2049,12 @@ void audit_log_n_hex(struct audit_buffer BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); - new_len = len<<1; + + if (check_shl_overflow(len, 1, &new_len)) { + audit_log_format(ab, "?"); + return; + } + if (new_len >= avail) { /* Round the buffer request up to the next multiple */ new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);