On Fri, Apr 28, 2023 at 01:34:14PM -0700, Casey Schaufler wrote:
> Implement Smack support for security_[gs]etselfattr.
> Refactor the setprocattr hook to avoid code duplication.
>
> Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> ---
> security/smack/smack_lsm.c | 106 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 101 insertions(+), 5 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 0b466d3b31b7..def13357156a 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -3552,6 +3552,45 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
> return;
> }
>
> +/**
> + * smack_getselfattr - Smack current process attribute
> + * @attr: which attribute to fetch
> + * @ctx: buffer to receive the result
> + * @size: available size in, actual size out
> + * @flags: unused
> + *
> + * Fill the passed user space @ctx with the details of the requested
> + * attribute.
> + *
> + * Returns 1, the number of attributes, on success, an error code otherwise.
> + */
> +static int smack_getselfattr(unsigned int attr, struct lsm_ctx __user *ctx,
> + size_t *size, u32 flags)
> +{
> + struct smack_known *skp = smk_of_current();
> + int total;
> + int slen;
> + int rc;
> +
> + if (attr != LSM_ATTR_CURRENT)
> + return -EOPNOTSUPP;
> +
> + slen = strlen(skp->smk_known) + 1;
> + total = ALIGN(slen + sizeof(*ctx), 8);
> + if (total > *size)
> + rc = -E2BIG;
> + else if (ctx)
> + rc = lsm_fill_user_ctx(ctx, skp->smk_known, slen, LSM_ID_SMACK,
> + 0);
> + else
> + rc = 1;
> +
> + *size = total;
> + if (rc >= 0)
> + return 1;
> + return rc;
> +}
> +
> /**
> * smack_getprocattr - Smack process attribute access
> * @p: the object task
> @@ -3581,8 +3620,8 @@ static int smack_getprocattr(struct task_struct *p, const char *name, char **val
> }
>
> /**
> - * smack_setprocattr - Smack process attribute setting
> - * @name: the name of the attribute in /proc/.../attr
> + * do_setattr - Smack process attribute setting
> + * @attr: the ID of the attribute
> * @value: the value to set
> * @size: the size of the value
> *
> @@ -3591,7 +3630,7 @@ static int smack_getprocattr(struct task_struct *p, const char *name, char **val
> *
> * Returns the length of the smack label or an error code
> */
> -static int smack_setprocattr(const char *name, void *value, size_t size)
> +static int do_setattr(u64 attr, void *value, size_t size)
> {
> struct task_smack *tsp = smack_cred(current_cred());
> struct cred *new;
> @@ -3605,8 +3644,8 @@ static int smack_setprocattr(const char *name, void *value, size_t size)
> if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
> return -EINVAL;
>
> - if (strcmp(name, "current") != 0)
> - return -EINVAL;
> + if (attr != LSM_ATTR_CURRENT)
> + return -EOPNOTSUPP;
>
> skp = smk_import_entry(value, size);
> if (IS_ERR(skp))
> @@ -3645,6 +3684,61 @@ static int smack_setprocattr(const char *name, void *value, size_t size)
> return size;
> }
>
> +/**
> + * smack_setselfattr - Set a Smack process attribute
> + * @attr: which attribute to set
> + * @ctx: buffer containing the data
> + * @size: size of @ctx
> + * @flags: unused
> + *
> + * Fill the passed user space @ctx with the details of the requested
> + * attribute.
> + *
> + * Returns 0 on success, an error code otherwise.
> + */
> +static int smack_setselfattr(unsigned int attr, struct lsm_ctx __user *ctx,
> + size_t size, u32 flags)
> +{
> + struct lsm_ctx *lctx;
> + int rc;
> +
> + lctx = kmalloc(size, GFP_KERNEL);
> + if (lctx == NULL)
> + return -ENOMEM;
> +
> + if (copy_from_user(lctx, ctx, size))
> + rc = -EFAULT;
> + else if (lctx->ctx_len > size)
Did you want to do E2BIG instead here? Or is that really seen as
invalid usage?
> + rc = -EINVAL;
> + else
> + rc = do_setattr(attr, lctx->ctx, lctx->ctx_len);
> +
> + kfree(lctx);
> + if (rc > 0)
> + return 0;
> + return rc;
> +}
> +
> +/**
> + * smack_setprocattr - Smack process attribute setting
> + * @name: the name of the attribute in /proc/.../attr
> + * @value: the value to set
> + * @size: the size of the value
> + *
> + * Sets the Smack value of the task. Only setting self
> + * is permitted and only with privilege
> + *
> + * Returns the length of the smack label or an error code
> + */
> +static int smack_setprocattr(const char *name, void *value, size_t size)
> +{
> + int attr = lsm_name_to_attr(name);
> +
> + if (attr)
If someone one day gets the brilliant idea to change LSM_ATTR_UNDEF to
-1, this won't work, so I would suggest changing to either "if (attr !=
LSM_ATTR_UNDEF)" or defining a valid_lsm_attr() helper and checking its
bool return value.
> + return do_setattr(attr, value, size);
> + return -EINVAL;
> +}
> +
> /**
> * smack_unix_stream_connect - Smack access on UDS
> * @sock: one sock
> @@ -4955,6 +5049,8 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
>
> LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
>
> + LSM_HOOK_INIT(getselfattr, smack_getselfattr),
> + LSM_HOOK_INIT(setselfattr, smack_setselfattr),
> LSM_HOOK_INIT(getprocattr, smack_getprocattr),
> LSM_HOOK_INIT(setprocattr, smack_setprocattr),
>
> --
> 2.39.2
>
