Messages in this thread |  | | Date | Fri, 17 Nov 2000 00:30:00 -0600 | Subject | Re: Linux 2.2.18pre21 | From | Peter Samuelson <> |
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[jesse] > 1. Your server closes all open directory file descriptors and chroots. > 2. Someone manages to run some exploit code in your process space which--
mkdir("foo") chroot("foo") chdir("../../../../../../../../../..") chroot(".")
mkdir proc mount -t proc none proc cd proc/1/cwd
Two easy "get out of jail free" cards. There are other, more complex exploits. You have added one more. They all require root privileges.
Bottom line: once you are in the chroot jail, you must drop root privileges, or you defeat the purpose. Security-conscious coders know this; it's not Linux-specific behavior or anything.
Peter - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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