Messages in this thread Patch in this message | | | Date | Sat, 15 Sep 2007 16:47:54 -0700 | From | Randy Dunlap <> | Subject | Re: crashme fault |
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Linus Torvalds wrote: > > On Sat, 15 Sep 2007, Linus Torvalds wrote: >> So regardless of whether we want to trust "user_mode(regs)" more than >> "error_code & PF_USER", it would definitely be very interesting if you can >> give a good "this is where it started happening". > > Also, can you point to good crashme sources, and give the arguments you > used to run it when it crashed?
I use http://people.delphiforums.com/gjc/crashme.tgz from http://people.delphiforums.com/gjc/crashme.html, plus one small patch:
--- gjc-crashme.orig/crashme.c +++ gjc-crashme/crashme.c @@ -260,7 +260,8 @@ void my_signal(sig, func) #else struct sigaction act; act.sa_handler = func; - act.sa_mask = 0; + //act.sa_mask = 0; + sigemptyset(&act.sa_mask); #ifdef linux act.sa_restorer = 0; #endif /* linux */
Command: ./crashme +2000 666 1000 1:00:00 1
> The original gjc crashme doesn't even do a "mprotect(PROT_EXEC)" by > default (nor does it even compile on a modern unix), so it's not going to > do anything. I hacked it up, and it appears to work ok for me, but I'm not > at all confident that I'm even close to recreating what you are doing.
So I'm missing some mprotect() call also? Oops.
> (It probably goes without saying that I've not reproduced the oops on my > Core 2 Duo. Lots of #GP and #PF errors, but nothing interesting. > > Linus
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