linux-kernel - Re: [PATCH v4 3/3] gen_init_cpio: add support for file metadata

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Date:   Thu, 16 Jun 2022 16:47:59 +0200
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
CC:     <viro@...iv.linux.org.uk>, <linux-security-module@...r.kernel.org>,
        <linux-integrity@...r.kernel.org>, <initramfs@...r.kernel.org>,
        <linux-api@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bug-cpio@....org>,
        <zohar@...ux.vnet.ibm.com>, <silviu.vlasceanu@...wei.com>,
        <dmitry.kasatkin@...wei.com>, <takondra@...co.com>,
        <kamensky@...co.com>, <hpa@...or.com>, <arnd@...db.de>,
        <rob@...dley.net>, <james.w.mcmechan@...il.com>,
        <niveditas98@...il.com>, Eugeniu Rosca <erosca@...adit-jv.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v4 3/3] gen_init_cpio: add support for file metadata

Hello Roberto,

On Do, Mai 23, 2019 at 02:18:03 +0200, Roberto Sassu wrote:
> This patch adds support for file metadata (only TYPE_XATTR metadata type).
> gen_init_cpio has been modified to read xattrs from files that will be
> added to the image and to include file metadata as separate files with the
> special name 'METADATA!!!'.
> 
> This behavior can be selected by setting the desired file metadata type as
> value for CONFIG_INITRAMFS_FILE_METADATA.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> ---
>  usr/Kconfig               |   8 +++
>  usr/Makefile              |   4 +-
>  usr/gen_init_cpio.c       | 137 ++++++++++++++++++++++++++++++++++++--
>  usr/gen_initramfs_list.sh |  10 ++-
>  4 files changed, 150 insertions(+), 9 deletions(-)
> 
> diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
> index 03b21189d58b..e93cb1093e77 100644
> --- a/usr/gen_init_cpio.c
> +++ b/usr/gen_init_cpio.c

[..]

> +static int write_xattrs(const char *path)
> +{

[..]

> +
> +		snprintf(str, sizeof(str), "%.8lx",
> +			 sizeof(hdr) + name_len + 1 + value_len);

Cppcheck 2.7 reports at this line:

usr/gen_init_cpio.c:107,portability,invalidPrintfArgType_uint,%lx in format string (no. 1) requires 'unsigned long' but the argument type is 'size_t {aka unsigned long}'.

This can be addressed via 's/lx/zx/', according to https://www.kernel.org/doc/Documentation/printk-formats.txt .

BR, Eugeniu