[lkml]   [2004]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [ANNOUNCE] Release Digsig 1.3.1: kernel module for run-time authentication of binaries
* Serge E. Hallyn ( wrote:
> > Thing is, x86 makes no distinction btween r/x so, have you tried mmaping
> > with read, then executing (I haven't)?
> Yup, clearly that will work on x86. And so obviously DigSig is not
> a solution to format and buffer overflows :) Nor, unfortunately, a


> solution to code which for whatever reason exploited this behavior.

That's what I was getting at. Beats me what's out there that does this,
but I expect some stuff does, and it wouldn't get the same assurance.

> > This has nothing to do with file permissions aside of read. All you need
> > is read permission, then you can mmap(PROT_EXEC) which will kick off the
> > check, and do deny_write_access. It's a freeform way to lock writers
> > out of any readable file in the system.
> No, not "any readable file," because DigSig will not lock non-ELF files.

Ahh, this is the part I had missed.

Linux Security Modules
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:06    [W:0.081 / U:34.656 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site