From: Paul Moore <paul@paul-moore.com>
To: Casey Schaufler <casey@schaufler-ca.com>,
linux-security-module@vger.kernel.org
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
jmorris@namei.org, keescook@chromium.org,
john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, mic@digikod.net
Subject: Re: [PATCH v10 7/11] LSM: Helpers for attribute names and filling lsm_ctx
Date: Wed, 07 Jun 2023 18:32:58 -0400 [thread overview]
Message-ID: <30166d8a65c734af1c36b15f01501903.paul@paul-moore.com> (raw)
In-Reply-To: <20230428203417.159874-8-casey@schaufler-ca.com>
On Apr 28, 2023 kernel test robot <lkp@intel.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@schaufler-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
--
paul-moore.com
next prev parent reply other threads:[~2023-06-07 22:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230428203417.159874-1-casey.ref@schaufler-ca.com>
2023-04-28 20:34 ` [PATCH v10 00/11] LSM: Three basic syscalls Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 01/11] LSM: Identify modules by more than name Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 02/11] LSM: Maintain a table of LSM attribute data Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 03/11] proc: Use lsmids instead of lsm names for attrs Casey Schaufler
2023-06-13 18:35 ` Serge Hallyn
2023-04-28 20:34 ` [PATCH v10 04/11] LSM: syscalls for current process attributes Casey Schaufler
2023-06-07 22:32 ` [PATCH v10 4/11] " Paul Moore
2023-06-07 23:26 ` Casey Schaufler
2023-06-13 18:54 ` [PATCH v10 04/11] " Serge Hallyn
2023-04-28 20:34 ` [PATCH v10 05/11] LSM: Create lsm_list_modules system call Casey Schaufler
2023-06-13 19:02 ` Serge Hallyn
2023-04-28 20:34 ` [PATCH v10 06/11] LSM: wireup Linux Security Module syscalls Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 07/11] LSM: Helpers for attribute names and filling lsm_ctx Casey Schaufler
2023-04-29 1:06 ` kernel test robot
2023-04-29 2:37 ` kernel test robot
2023-06-07 22:32 ` Paul Moore [this message]
2023-06-15 13:19 ` Serge Hallyn
2023-06-15 13:27 ` Serge Hallyn
2023-04-28 20:34 ` [PATCH v10 08/11] Smack: implement setselfattr and getselfattr hooks Casey Schaufler
2023-06-15 15:29 ` Serge Hallyn
2023-04-28 20:34 ` [PATCH v10 09/11] AppArmor: Add selfattr hooks Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 10/11] SELinux: " Casey Schaufler
2023-06-07 22:32 ` Paul Moore
2023-06-07 23:39 ` Casey Schaufler
2023-04-28 20:34 ` [PATCH v10 11/11] LSM: selftests for Linux Security Module syscalls Casey Schaufler
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