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

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Date:   Thu, 16 Jun 2022 17:16:03 +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

[..]

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

[..]

> +	while (list_ptr < xattr_list + list_len) {
> +		name_len = strlen(list_ptr);

PVS-Studio 7.19 reports at this line:

=> usr/gen_init_cpio.c	84	warn	V769
=> The 'xattr_list' pointer in the 'xattr_list + list_len' expression could be nullptr.
=> In such case, resulting value will be senseless and it should not be used. Check lines: 84, 69.

I guess the finding is valid and it's due to the fact that
the malloc return value is not being checked/sanitized?

BR, Eugeniu.