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Date: Thu, 2 Jan 2020 08:58:09 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Aleksa Sarai' <cyphar@...har.com>, Linus Torvalds <torvalds@...ux-foundation.org> CC: Al Viro <viro@...iv.linux.org.uk>, David Howells <dhowells@...hat.com>, Eric Biederman <ebiederm@...ssion.com>, stable <stable@...r.kernel.org>, Christian Brauner <christian.brauner@...ntu.com>, Serge Hallyn <serge@...lyn.com>, "dev@...ncontainers.org" <dev@...ncontainers.org>, "Linux Containers" <containers@...ts.linux-foundation.org>, Linux API <linux-api@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: RE: [PATCH RFC 0/1] mount: universally disallow mounting over symlinks From: Aleksa Sarai > Sent: 30 December 2019 08:32 ... > I'm not sure I agree -- as I mentioned in my other mail, re-opening > through /proc/self/fd/$n works *very* well and has for a long time (in > fact, both LXC and runc depend on this working). I thought it was marginally broken because it is followed as a symlink? On, for example, NetBSD /proc/<n>/fd/<n> is a real reference to the filesystem inode and can be used to link the file back into the filesystem if all the directory entries have been removed. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
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