[Bug 2721] Improve SFTP server to make remove always work on ZFS/Btrfs

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2721

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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                 CC|                            |djm at mindrot.org

--- Comment #3 from Damien Miller <djm at mindrot.org> ---
(In reply to Stefan Walter from comment #2)

> The question of course is, can a malicious user on the system
> exploit any race conditions in this process.

sure - it's racy.

I don't think sftp should attempt to do magic to work around filesystem
corner cases, especially when rm(1) doesn't.

OTOH we should offer users the ability to truncate a file themselves if
we don't already.

Does "put /dev/null file-to-delete" work to truncate? AFAIK it should
because we open(.., O_TRUNC, ..)

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