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SubjectRe: new ...at() flag: AT_NO_JUMPS
On Sat, Apr 29, 2017 at 04:17:18PM -0700, Andy Lutomirski wrote:
> 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 "../.."?

All of those will be rejected - in each of those cases pathname traversal
leads back into the starting point with .. being the next component to
handle.

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