On Apr 28, 2023 Casey Schaufler <casey@xxxxxxxxxxxxxxxx> wrote:
>
> Add hooks for setselfattr and getselfattr. These hooks are not very
> different from their setprocattr and getprocattr equivalents, and
> much of the code is shared.
>
> Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> Cc: selinux@xxxxxxxxxxxxxxx
> Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
> ---
> security/selinux/hooks.c | 154 +++++++++++++++++++++++++++++++--------
> 1 file changed, 124 insertions(+), 30 deletions(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 2ee92d3fb79d..e78b955e04f8 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -6542,6 +6559,81 @@ static int selinux_setprocattr(const char *name, void *value, size_t size)
> return error;
> }
>
> +static int selinux_getselfattr(unsigned int attr, struct lsm_ctx __user *ctx,
> + size_t *size, u32 flags)
> +{
> + char *value;
> + size_t total_len;
> + int len;
> + int rc;
> +
> + len = selinux_lsm_getattr(attr, current, &value);
> + if (len < 0)
> + return len;
> +
> + total_len = ALIGN(struct_size(ctx, ctx, len), 8);
> +
> + if (total_len > *size)
> + rc = -E2BIG;
Hmm. Since we need to calculate the aligned @total_len value in the
LSM specific code, perhaps it doesn't make sense to also do the
alignment in lsm_fill_user_ctx(). My apologies, I know I was the one
who suggested doing the alignment in a common place previously.
> + else if (ctx)
> + rc = lsm_fill_user_ctx(ctx, value, len, LSM_ID_SELINUX, 0);
> + else
> + rc = 1;
> +
> + *size = total_len;
> + if (rc < 0)
> + return rc;
> + return 1;
> +}
--
paul-moore.com
