Messages in this thread | | | Subject | Re: Ptrace hole / Linux 2.2.25 | From | Ben Pfaff <> | Date | 17 Mar 2003 10:39:31 -0800 |
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Alan Cox <alan@redhat.com> writes:
> A patch for Linux 2.4.20/Linux 2.4.21pre is attached. The patch also > subtly changes the PR_SET_DUMPABLE prctl. We believe this is neccessary and > that it will not affect any software. The functionality change is specific > to unusual debugging situations.
I am concerned about this change because it will break sandboxing software that I have written, which uses prctl() to turn dumpability back on so that it can open a file, setuid(), and then execve() through the open file via /proc/self/fd/#. Without calling prctl(), the ownership of /proc/self/fd/* becomes root, so the process cannot exec it after it drops privileges. It uses prctl() in other places to get the same effect in /proc, but that's one of the most critical. -- <blp@cs.stanford.edu> <pfaffben@msu.edu> <pfaffben@debian.org> <blp@gnu.org> Stanford Ph.D. Student - MSU Alumnus - Debian Maintainer - GNU Developer www.benpfaff.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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