On Thu, Oct 07, 2010 at 05:23:12PM +0200, WAROQUIERS Philippe wrote: > >mmap(0x402001000, 4194304, PROT_READ|PROT_WRITE|PROT_EXEC, > >MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = -1 EPERM > >(Operation not permitted) > >getpid() = 27233 > > > >This is probably due to grsecurity kernel but I am not sure > >why, it has worked > >before on a 32 bit system. > According to the mmap manual on my system (red-hat 5.2), > EPERM on mmap means: > PROT_EXEC asked but mapped file is on a file system mounted no-exec. > > But the call above does not map a file. > The documentation also says that if MAP_ANONYMOUS is given, the fd arg > is ignored but that some implementations require fd to be -1 in this > case > and recommends that portable implementations gives -1. > (it looks like valgrind does not follow this recommendation, but it is > unclear > if that is the cause of your problem). I guess it is easy to patch > valgrind > to give -1 instead of 0 for map_anonymous. > > But the grsecurity features are probably the most probably guilty. > > Philippe > Yep. It seems that grsecurity has nowadays feature which prevents any RWX mappings silently. Luckily paxctl -m disables that. Hope this helps anyone else who runs into this. Although you need to do that for
Yep. It seems that grsecurity has nowadays feature which prevents any RWX mappings silently. Luckily paxctl -m disables that. Hope this helps anyone else who runs into this. Although you need to do that for /usr/lib/valgrind/memcheck-amd64-linux or equivalent, as it execve's this and it's the actual failing binary. Aki Tuomi
signature.asc
Description: Digital signature
------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb
_______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
