linux-kernel - Re: [PATCH v10 7/11] LSM: Helpers for attribute names and filling lsm

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Message-ID: <30166d8a65c734af1c36b15f01501903.paul@paul-moore.com>
Date:   Wed, 07 Jun 2023 18:32:58 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Casey Schaufler <casey@...aufler-ca.com>,
        linux-security-module@...r.kernel.org
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        jmorris@...ei.org, keescook@...omium.org,
        john.johansen@...onical.com, penguin-kernel@...ove.sakura.ne.jp,
        stephen.smalley.work@...il.com, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, mic@...ikod.net
Subject: Re: [PATCH v10 7/11] LSM: Helpers for attribute names and filling  lsm_ctx

On Apr 28, 2023 kernel test robot <lkp@...el.com> wrote:
> 
> Add lsm_name_to_attr(), which translates a text string to a
> LSM_ATTR value if one is available.
> 
> Add lsm_fill_user_ctx(), which fills a struct lsm_ctx, including
> the trailing attribute value. The .len value is padded to a multiple
> of 64 bits for alignment.
> 
> All are used in module specific components of LSM system calls.
> 
> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> ---
>  include/linux/security.h | 13 ++++++++++++
>  security/lsm_syscalls.c  | 24 ++++++++++++++++++++++
>  security/security.c      | 44 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 81 insertions(+)

...

> diff --git a/security/security.c b/security/security.c
> index 94b78bfd06b9..8c877d639cae 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -761,6 +761,50 @@ static int lsm_superblock_alloc(struct super_block *sb)
>  	return 0;
>  }
>  
> +/**
> + * lsm_fill_user_ctx - Fill a user space lsm_ctx structure
> + * @ctx: an LSM context to be filled
> + * @context: the new context value
> + * @context_size: the size of the new context value
> + * @id: LSM id
> + * @flags: LSM defined flags
> + *
> + * Fill all of the fields in a user space lsm_ctx structure.
> + * Caller is assumed to have verified that @ctx has enough space
> + * for @context.
> + *
> + * The total length is padded to a multiple of 64 bits to
> + * accomodate possible alignment issues.
> + *
> + * Returns 0 on success, -EFAULT on a copyout error, -ENOMEM
> + * if memory can't be allocated.
> + */
> +int lsm_fill_user_ctx(struct lsm_ctx __user *ctx, void *context,
> +		      size_t context_size, u64 id, u64 flags)
> +{
> +	struct lsm_ctx *lctx;
> +	size_t locallen = ALIGN(struct_size(lctx, ctx, context_size), 8);

See my comment in 7/11 regarding the alignment calculation here.

> +	int rc = 0;
> +
> +	lctx = kzalloc(locallen, GFP_KERNEL);
> +	if (lctx == NULL)
> +		return -ENOMEM;
> +
> +	lctx->id = id;
> +	lctx->flags = flags;
> +	lctx->ctx_len = context_size;
> +	lctx->len = locallen;
> +
> +	memcpy(lctx->ctx, context, context_size);
> +
> +	if (copy_to_user(ctx, lctx, locallen))
> +		rc = -EFAULT;
> +
> +	kfree(lctx);
> +
> +	return rc;
> +}
> +
>  /*
>   * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
>   * can be accessed with:
> -- 
> 2.39.2

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