Messages in this thread | | | Date | Tue, 28 Jun 2011 06:45:21 +0530 | Subject | Re: [PATCH 1/2] proc: restrict access to /proc/PID/io | From | Balbir Singh <> |
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On Tue, Jun 28, 2011 at 6:43 AM, Balbir Singh <balbir@linux.vnet.ibm.com> wrote: > 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.
Please NOTE my email address has changed to bsingharora@gmail.com, the last email has an invalid from header. I apologize for the inconvenience
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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