Messages in this thread | | | Date | Tue, 28 Jun 2011 06:43:54 +0530 | Subject | Re: [PATCH 1/2] proc: restrict access to /proc/PID/io | From | Balbir Singh <> |
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On Fri, Jun 24, 2011 at 5:38 PM, Vasiliy Kulikov <segoon@openwall.com> wrote: > /proc/PID/io may be used for gathering private information. E.g. for > openssh and vsftpd daemons wchars/rchars may be used to learn the > precise password length. Restrict it to processes being able to ptrace > the target process. >
Hmm.. How do I reproduce this, won't they be enough randomness around rchar/wchar by the time the attacker reads it?
> ptrace_may_access() is needed to prevent keeping open file descriptor of > "io" file, executing setuid binary and gathering io information of the > setuid'ed process.
Balbir Singh -- 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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