Date: Mon, 26 Aug 2024 18:47:25 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 280809] jail_attach(2) fails to document reason for EPERM Message-ID: <bug-280809-227-FRF3pG3DE7@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-280809-227@https.bugs.freebsd.org/bugzilla/> References: <bug-280809-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D280809 --- Comment #4 from Karlo Mili=C4=8Devi=C4=87 <karlo98.m@gmail.com> --- (In reply to Olivier Certner from comment #1) Ah! I totally missed that paragraph. I guess I should read more carefully. (In reply to crest from comment #3) Could you add "root vnode pointer" to every directory FD to limit their sco= pe? That way, when you reference ".." you would check whether the directory FD equals that pointer and if so, not go above. Also, O_RESOLVE_BENEATH would then just mean that when you open that direct= ory FD you would make the directory itself be the "root vnode pointer" instead = of its jail/chroot root directory. Opening directories with openat copies the "root vnode pointer" unless overriden by something like O_RESOLVE_BENEATH. ((I have no experience with VFS code, so take this idea with a grain of sal= t!)) This reminds me slightly of how sockets have vnet pointers. Should I close this issue or does someone else do that? The reason is documented already, as stated by Olivier Cartner. --=20 You are receiving this mail because: You are the assignee for the bug.=
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