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audit: Initialize vattr fields before calling VOP_GETATTR

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Some filesystems do not fill out certain optional vattr fields.  To
ensure that they do not get copied out to userspace uninitialized, use
VATTR_NULL to provide default values.

Reported by:	KMSAN
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2022-03-19 21:59:13 -04:00
parent 964bf2f902
commit ecd764b0ea
1 changed files with 1 additions and 0 deletions
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1
sys/security/audit/audit_arg.c
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@ -873,6 +873,7 @@ audit_arg_vnode(struct vnode *vp, struct vnode_au_info *vnp)
ASSERT_VOP_LOCKED(vp, "audit_arg_vnode");
VATTR_NULL(&vattr);
error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
if (error) {
/* XXX: How to handle this case? */