Messages in this thread |  | | Subject | Re: [RFC] "Text file busy" when overwriting libraries | Date | Mon, 15 Oct 2001 12:54:19 +0100 (BST) | From | Alan Cox <> |
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> Just to reiterate I see this as a solution to two problems > 1) It adds an additional safety check that shared libraries won't > mutate under you.
Which prevents a user with rights doing so deliberately.
> 2) It allows user space access to the security policy information > regarding executables. Allowing ld-linux.so to refust to > execute binaries, and shared libaries on a filesystem mounted > noexec.
Which is mostly useless anyway since anyone can write an ld-linux that doesn't check providing the binary is readable. noexec is basically a weird ancient unixism that is usless.
> My biggest unresolved issue is which numbers to choose for O_EXEC on > every platform. As the DENYWRITE code is cleaner in open than in mmap.
And the fact that open has side effects.
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