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lsm: correct error codes in security_getselfattr()

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We should return -EINVAL if the user specifies LSM_FLAG_SINGLE without
supplying a valid lsm_ctx struct buffer.

Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2023-10-24 12:42:38 -04:00
parent dc46db78b9
commit fdcf699b60
1 changed files with 2 additions and 2 deletions
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4
security/security.c
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@ -3922,9 +3922,9 @@ int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
/*
* Only flag supported is LSM_FLAG_SINGLE
*/
if (flags != LSM_FLAG_SINGLE)
if (flags != LSM_FLAG_SINGLE || !uctx)
return -EINVAL;
if (uctx && copy_from_user(&lctx, uctx, sizeof(lctx)))
if (copy_from_user(&lctx, uctx, sizeof(lctx)))
return -EFAULT;
/*
* If the LSM ID isn't specified it is an error.