From: Andy Lutomirski <luto@kernel.org>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linux API <linux-api@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>
Subject: Re: new ...at() flag: AT_NO_JUMPS
Date: Sat, 29 Apr 2017 16:17:18 -0700 [thread overview]
Message-ID: <CALCETrXhOhG0tRDDOROwT9ghvQvKziM2PBN=CX5Soa2m7=0cFw@mail.gmail.com> (raw)
In-Reply-To: <20170429220414.GT29622@ZenIV.linux.org.uk>
On Sat, Apr 29, 2017 at 3:04 PM, Al Viro <viro@zeniv.linux.org.uk> wrote:
> New AT_... flag - AT_NO_JUMPS
>
> Semantics: pathname resolution must not involve
> * traversals of absolute symlinks
> * traversals of procfs-style symlinks
> * traversals of mountpoints (including bindings, referrals, etc.)
> * traversal of .. in the starting point of pathname resolution.
Can you clarify this last one? I assume that ".." will be rejected,
but what about "a/../.."? How about "b" if b is a symlink to ".."?
How about "a/b" if a is a directory and b is a symlink to "../.."?
> Right now I have it hooked only for fstatat() and friends; it could be
> easily extended to any ...at() syscalls. Objections?
I like it, assuming the answers to all the questions above are that
they will be rejected.
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Cc: Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux FS Devel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: new ...at() flag: AT_NO_JUMPS
Date: Sat, 29 Apr 2017 16:17:18 -0700 [thread overview]
Message-ID: <CALCETrXhOhG0tRDDOROwT9ghvQvKziM2PBN=CX5Soa2m7=0cFw@mail.gmail.com> (raw)
In-Reply-To: <20170429220414.GT29622-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
On Sat, Apr 29, 2017 at 3:04 PM, Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org> wrote:
> New AT_... flag - AT_NO_JUMPS
>
> Semantics: pathname resolution must not involve
> * traversals of absolute symlinks
> * traversals of procfs-style symlinks
> * traversals of mountpoints (including bindings, referrals, etc.)
> * traversal of .. in the starting point of pathname resolution.
Can you clarify this last one? I assume that ".." will be rejected,
but what about "a/../.."? How about "b" if b is a symlink to ".."?
How about "a/b" if a is a directory and b is a symlink to "../.."?
> Right now I have it hooked only for fstatat() and friends; it could be
> easily extended to any ...at() syscalls. Objections?
I like it, assuming the answers to all the questions above are that
they will be rejected.
next prev parent reply other threads:[~2017-04-29 23:17 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-29 22:04 new ...at() flag: AT_NO_JUMPS Al Viro
2017-04-29 22:04 ` Al Viro
2017-04-29 23:17 ` Andy Lutomirski [this message]
2017-04-29 23:17 ` Andy Lutomirski
2017-04-29 23:25 ` Al Viro
2017-04-29 23:25 ` Al Viro
2017-04-30 1:13 ` Andy Lutomirski
2017-04-30 4:38 ` Matthew Wilcox
2017-04-30 4:38 ` Matthew Wilcox
2017-04-30 16:10 ` Al Viro
2017-04-30 16:10 ` Al Viro
2017-05-01 4:52 ` Andy Lutomirski
2017-05-01 5:15 ` Al Viro
2017-05-01 5:15 ` Al Viro
2017-05-01 17:36 ` Jann Horn
2017-05-01 19:37 ` Andy Lutomirski
2017-05-05 0:30 ` Al Viro
2017-05-05 0:30 ` Al Viro
2017-05-05 0:44 ` Andy Lutomirski
2017-05-05 1:06 ` Al Viro
2017-05-05 1:27 ` Linus Torvalds
2017-05-05 1:27 ` Linus Torvalds
2017-05-05 3:00 ` Al Viro
2017-05-05 3:00 ` Al Viro
2017-05-05 4:01 ` Linus Torvalds
2017-05-05 4:31 ` Andy Lutomirski
2017-05-05 2:47 ` Jann Horn
2017-05-05 3:46 ` Linus Torvalds
2017-05-05 4:39 ` Al Viro
2017-05-05 4:39 ` Al Viro
2017-05-05 4:44 ` Andy Lutomirski
2017-05-05 20:04 ` Eric W. Biederman
2017-05-05 20:04 ` Eric W. Biederman
2017-05-05 20:28 ` Eric W. Biederman
2017-05-08 19:34 ` Mickaël Salaün
2017-05-08 19:34 ` Mickaël Salaün
2017-05-18 8:50 ` David Drysdale
2017-09-10 20:26 Jürg Billeter
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