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The attached patch updates the filters to extend the syscall argument limits by allowing a specific value outside that min..range, and -1 is passed for this value where needed.Thus in effect the uid/gid syscall limits now allow anything in [min, max], and also -1./* Steinar */ -- Homepage: Source: mpm-itk Source-Version: 2.4.7-02-1 We believe that the bug you reported is fixed in the latest version of mpm-itk, which is due to be installed in the Debian FTP archive.A summary of the changes between this version and the previous one is attached.Thus code which *should* be allowed (such as setresuid(-1, currentid, -1) return EPERM.In practice, this breaks anything that relies on uid changes that *should* be permitted: in my case, a cgi script that invokes ssh fails because ssh calls something with a -1 argument.Date: Fri, UTC Severity: important Found in version mpm-itk/2.4.6-01-1 Fixed in version mpm-itk/2.4.7-02-1 Done: [email protected](Steinar H. The reason stems from the fact that -1 is a permitted argument for syscalls that change multiple ID's at once, such as setresuid, to which (uid_t) -1 can be passed to indicate "don't change this value." Since (uid_t) -1 == 4294967295 for everything except the old 16-bit i386 syscalls, these do-nothing values well exceed the max_uid = 65535, and so these calls are blocked.
Unfortunately, due to travel and others, I haven't had the time to look into your patch, but this does not mean it's not appreciated :-) Hopefully things will calm a bit down at some point.
Thank you for reporting the bug, which will now be closed. Gunderson (supplier of updated mpm-itk package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing [email protected]) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Format: 1.8 Date: Sat, +0100 Source: mpm-itk Binary: libapache2-mpm-itk Architecture: source amd64 Version: 2.4.7-02-1 Distribution: unstable Urgency: medium Maintainer: Steinar H.
If you have further comments please address them to [email protected], and the maintainer will reopen the bug report if appropriate. Gunderson Description: libapache2-mpm-itk - multiuser module for Apache Closes: 738131 Changes: mpm-itk (2.4.7-02-1) unstable; urgency=medium . - In the seccomp.c filter, allow -1 as value in certain system calls, as it means not to change the given value.
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With the patch, -1 is allowed for all the arguments of the blocked syscalls except for __NR_setuid/__NR_setgid (and the ...32 version on i386): -1 isn't a special value there.-1 isn't special for __NR_setfsuid (and ...gid), either, but since man setfsuid specifically suggests calling setfsuid a second time (with -1 as an argument) to detect failures, I allowed it for those syscalls, too.