Messages in this thread | | | Date | Fri, 11 Feb 2000 22:42:00 +0100 | From | Pavel Machek <> | Subject | Re: Capabilities |
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HI!
> This configuration would prevent any hack entry into the server (via bugs/ > stack overflow, etc) from being able to do anything to the data (no write > down). Without the exec, no shell process could be generated. The > most that
Sorry, disabling exec is security by obscurity (it will deter 95% attacks, still!). You can do exec without actually invoking exec system call -- you close some fds, mmap executable somewhere into your address space, unmap old files ... and you've done exec() without actually doing exec. (Mj's freezer does something pretty similar -- for example he could freeze bash then unfreeze it into your web server!) Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents me at discuss@linmodems.org
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