linux-kernel - Re: [PATCH v12 7/11] LSM: Helpers for attribute names and filling lsm

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Date:   Fri, 30 Jun 2023 14:23:43 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     linux-security-module@...r.kernel.org, jmorris@...ei.org,
        serge@...lyn.com, 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 v12 7/11] LSM: Helpers for attribute names and filling lsm_ctx

On Fri, Jun 30, 2023 at 1:11 PM Casey Schaufler <casey@...aufler-ca.com> wrote:
>
> On 6/29/2023 7:14 PM, Paul Moore wrote:
> > On Jun 29, 2023 Casey Schaufler <casey@...aufler-ca.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.
> >>
> >> All are used in module specific components of LSM system calls.
> >>
> >> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> >> Reviewed-by: Serge Hallyn <serge@...lyn.com>
> >> ---
> >>  include/linux/security.h | 14 +++++++++++++
> >>  security/lsm_syscalls.c  | 24 ++++++++++++++++++++++
> >>  security/security.c      | 44 ++++++++++++++++++++++++++++++++++++++++
> >>  3 files changed, 82 insertions(+)
> > ..
> >
> >> diff --git a/security/security.c b/security/security.c
> >> index 199db23581f1..72ad7197b2c9 100644
> >> --- a/security/security.c
> >> +++ b/security/security.c
> >> @@ -770,6 +770,50 @@ 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.
> > We should drop the sentence above now that alignment is the caller's
> > responsibility, but since that was largely my fault I can fix this up
> > during the merge assuming you're okay with that Casey.
>
> I have to fix the error in patch 8/11 anyway. I can fix this, too.

Great, thanks.

-- 
paul-moore.com