On Wed, 20 Jun 2007, Thyago Braga da Silva wrote:
:] A binary which you have NOT permission to execute but only to read, it can
:] be executed.
Morning...
On 2.6 kernel its not possible JUST run directly from noexec partition:
[@ogoreczek ~]$ /lib/ld-linux.so.2 /tmp/ls
/tmp/ls: error while loading shared libraries: /tmp/ls: failed to map
segment from shared object: Operation not permitted
/dev/hda2 on /tmp type ext3 (rw,noexec)
but of course You can still use other interpreter:
[@ogoreczek /tmp]$ /usr/bin/perl /tmp/a.pl
lpr
[@ogoreczek /tmp]$ /lib/ld-linux.so.2 /usr/bin/perl /tmp/a.pl
lpr
[@ogoreczek /tmp]$ cat a.pl
#!/usr/bin/perl
print "lpr\n";
Kanedaaa
:]
:] On Tue, 19 Jun 2007 13:33:21 +1200, Robin Sheat said:
:] > I think it's also the case (I don't have a noexec partition handy to
:] > test on) that you can get around this by doing something like:
:] > /lib/ld-linux.so.2 /tmp/mybadbinary
:] > e.g.:
:] > /lib/ld-linux.so.2 /bin/ls
:]
:] This particular trick was closed in the 2.6.0 kernel. I am *not* sure
:] whether the fix was backported to the 2.4 kernel or not.
:]
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