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Sm=C3=B8rg?=rav Subject: git: b063e9c13a91 - stable/13 - vfs: Let prison_enforce_statfs zero the fsid List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: des X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: b063e9c13a916cea96596de5c32cd0206aaf1c08 Auto-Submitted: auto-generated Date: Fri, 19 Dec 2025 18:07:09 +0000 Message-Id: <6945944d.24352.76dacd29@gitrepo.freebsd.org> The branch stable/13 has been updated by des: URL: https://cgit.FreeBSD.org/src/commit/?id=b063e9c13a916cea96596de5c32cd0206aaf1c08 commit b063e9c13a916cea96596de5c32cd0206aaf1c08 Author: Dag-Erling Smørgrav AuthorDate: 2025-12-14 13:16:16 +0000 Commit: Dag-Erling Smørgrav CommitDate: 2025-12-19 18:07:04 +0000 vfs: Let prison_enforce_statfs zero the fsid Currently, we unconditionally zero the fsid before returning a struct statfs to a jailed process. Move this into prison_enforce_statfs() so it only happens if enforce_statfs is greater than 1, or enforce_statfs is 1 but the mountpoint is outside the jail. PR: 291301 MFC after: 1 week Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D54214 (cherry picked from commit d4f25d0c7957f0f1960028eec82625c2d6405537) --- sys/kern/kern_jail.c | 3 +++ sys/kern/vfs_syscalls.c | 5 +---- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c index 5c2da1048b7b..a1ee1bf1aab8 100644 --- a/sys/kern/kern_jail.c +++ b/sys/kern/kern_jail.c @@ -3397,11 +3397,14 @@ prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp) if (pr->pr_enforce_statfs == 0) return; if (prison_canseemount(cred, mp) != 0) { + bzero(&sp->f_fsid, sizeof(sp->f_fsid)); bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); strlcpy(sp->f_mntonname, "[restricted]", sizeof(sp->f_mntonname)); return; } + if (pr->pr_enforce_statfs > 1) + bzero(&sp->f_fsid, sizeof(sp->f_fsid)); if (pr->pr_root->v_mount == mp) { /* * Clear current buffer data, so we are sure nothing from diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c index 51f26b843c45..75568e858b78 100644 --- a/sys/kern/vfs_syscalls.c +++ b/sys/kern/vfs_syscalls.c @@ -291,10 +291,8 @@ kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) error = VFS_STATFS(mp, buf); if (error != 0) goto out; - if (priv_check_cred_vfs_generation(td->td_ucred)) { - buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; + if (priv_check_cred_vfs_generation(td->td_ucred)) prison_enforce_statfs(td->td_ucred, mp, buf); - } out: vfs_unbusy(mp); return (error); @@ -546,7 +544,6 @@ restart: sptmp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); *sptmp = *sp; - sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; prison_enforce_statfs(td->td_ucred, mp, sptmp); sp = sptmp; } else