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    Subjectsymlinks with permissions

    ...yes, they do exist, in /proc/self/fd/* . Unfortunately, their
    permissions are not actually checked during open, resulting in
    (obscure) security hole: if you have fd open for reading, you can
    reopen it for write, even through unix permissions would not allow

    Now... I'd like to close the hole. One way would be to actually check
    symlink permissions on open -- because those symlinks already have
    correct permissions.

    But ... then I got lost in vfs. Can someone help? Is there better way?

    (cesky, pictures)

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      Last update: 2009-10-25 20:15    [W:0.029 / U:13.024 seconds]
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