[uml-devel] uml doesn't like stack protection of GCC hardened

[uml-devel] uml doesn't like stack protection of GCC hardened

[Blaisorblade]

Only once, I got the following error with an UML compiled with GCC hardened:

Configuring network interfaces...
Debug: sleeping function called from invalid context 
at /home/paolo/Admin/kernel/6/VCS/linux-2.6.16/mm/slab.c:2729
remove_umid_dir - actually_do_remove failed with err = -2

vmlinux-2.6.16.9-bs2-read_output: stack smashing attack in function 
start_idle_thread()

And UML exited.

That's surely a false positive, likely caused by setjmp() / longjmp() games, 
and I never saw it (but possibly other times it happened and I ignored it) - 
I have not had a _bad_ experience with the hardened GCC (I've written some 
patches to allow UML to compile with it, they'll be in -bs2 - it simply 
amounts to disabling -fpie and -fstack-protector for sensitive files).

However, I still wanted to inform you of this.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


		
___________________________________ 
Bolletta salata? Passa a Yahoo! Messenger with Voice 
http://it.messenger.yahoo.com



-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel