linux-kernel - Re: [PATCH v3] LSM: use 32 bit compatible data types in LSM syscalls.

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Date: Thu, 14 Mar 2024 08:45:09 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: Paul Moore <paul@...l-moore.com>, "Dmitry V. Levin" <ldv@...ace.io>,
 LSM List <linux-security-module@...r.kernel.org>
Cc: Linux kernel mailing list <linux-kernel@...r.kernel.org>,
 linux-api@...r.kernel.org, Mickaël Salaün
 <mic@...ikod.net>, James Morris <jmorris@...ei.org>,
 Serge Hallyn <serge@...lyn.com>, John Johansen
 <john.johansen@...onical.com>,
 Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
 Stephen Smalley <stephen.smalley.work@...il.com>,
 Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH v3] LSM: use 32 bit compatible data types in LSM syscalls.

On 3/14/2024 8:30 AM, Paul Moore wrote:
> On Wed, Mar 13, 2024 at 4:07 PM Paul Moore <paul@...l-moore.com> wrote:
>> On Mar 13, 2024 Casey Schaufler <casey@...aufler-ca.com> wrote:
>>> LSM: use 32 bit compatible data types in LSM syscalls.
>>>
>>> Change the size parameters in lsm_list_modules(), lsm_set_self_attr()
>>> and lsm_get_self_attr() from size_t to u32. This avoids the need to
>>> have different interfaces for 32 and 64 bit systems.
>>>
>>> Cc: stable@...r.kernel.org
>>> Fixes: a04a1198088a: ("LSM: syscalls for current process attributes")
>>> Fixes: ad4aff9ec25f: ("LSM: Create lsm_list_modules system call")
>>> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
>>> Reported-and-reviewed-by: Dmitry V. Levin <ldv@...ace.io>
>>> ---
>>>  include/linux/lsm_hook_defs.h                        |  4 ++--
>>>  include/linux/security.h                             |  8 ++++----
>>>  security/apparmor/lsm.c                              |  4 ++--
>>>  security/lsm_syscalls.c                              | 10 +++++-----
>>>  security/security.c                                  | 12 ++++++------
>>>  security/selinux/hooks.c                             |  4 ++--
>>>  security/smack/smack_lsm.c                           |  4 ++--
>>>  tools/testing/selftests/lsm/common.h                 |  6 +++---
>>>  tools/testing/selftests/lsm/lsm_get_self_attr_test.c | 10 +++++-----
>>>  tools/testing/selftests/lsm/lsm_list_modules_test.c  |  8 ++++----
>>>  tools/testing/selftests/lsm/lsm_set_self_attr_test.c |  6 +++---
>>>  11 files changed, 38 insertions(+), 38 deletions(-)
>> Okay, this looks better, I'm going to merge this into lsm/stable-6.9
>> and put it through the usual automated testing as well as a kselftest
>> run to make sure everything there is still okay.  Assuming all goes
>> well and no one raises any objections, I'll likely send this up to
>> Linus tomorrow.
> I had to squash the code snippet below into the patch to address a
> build problem identified by the kernel build robot.  I'm going to keep
> Casey's sign-off and Dmitry's reported-reviewed tag as I feel this
> change is minor, but if anyone has any objections please let me know
> soon.

Looks fine to me. Thank you.

>
> [NOTE: cut-n-paste'd into email, likely whitespace damage, but you get the idea]
>
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 77eb9b0e7685..e619ac10cd23 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -960,10 +960,10 @@ asmlinkage long sys_cachestat(unsigned int fd,
>                struct cachestat __user *cstat, unsigned int flags);
> asmlinkage long sys_map_shadow_stack(unsigned long addr, unsigned long size, un
> signed int flags);
> asmlinkage long sys_lsm_get_self_attr(unsigned int attr, struct lsm_ctx *ctx,
> -                                     size_t *size, __u32 flags);
> +                                     u32 *size, u32 flags);
> asmlinkage long sys_lsm_set_self_attr(unsigned int attr, struct lsm_ctx *ctx,
> -                                     size_t size, __u32 flags);
> -asmlinkage long sys_lsm_list_modules(u64 *ids, size_t *size, u32 flags);
> +                                     u32 size, u32 flags);
> +asmlinkage long sys_lsm_list_modules(u64 *ids, u32 *size, u32 flags);
>
> /*
>  * Architecture-specific system calls
>