Re: [fuse-devel] valgrind & fuse: failed to exec fusermount: Permission denied

[Richard D. <ri...@ph...>]

Hello.

saf wrote:
> I have a new problem to run valgrind with FUSE:
> saf@rack ~/cvs/client/fuse/src $ valgrind ./noofs_fuse -c 50 -i 120 root:noofs@localhost:4242 -f -d -o allow_other 
> /mnt2
> ...
> Mounting now filesystem via FUSE...
> init.c@un_init(...) [00020]: 
> ==15072== 
> ==15072== Thread 1:
> ==15072== Syscall param socketcall.recvmsg(msg) points to uninitialised byte(s)
> ==15072==    at 0x404F7DE: recvmsg (in /lib/tls/libpthread-2.3.5.so)
> ==15072==    by 0x403F54F: fuse_mount (mount.c:281)
> ==15072==    by 0x403ECD1: fuse_setup_common (helper.c:203)
> ==15072==    by 0x403EEAD: fuse_main_common (helper.c:262)
> ==15072==    by 0x804CA75: main (main.c:59)
> ==15072==  Address 0xBEF96748 is on thread 1's stack
> fuse: failed to exec fusermount: Permission denied
> 
> I don't understand why I get Permission denied, I tried also as root user with root permissions,
> I got the same error.
> It seems that it comes from recvmsg of the fuse module to the fuse lib?
> 
> I use fuse 2.5.0 and valgrind-3.1.0-Debian.
> 
> Does some body knows why I get this error? I need to debug my fuse client.

I've seen similar problems with setuid programs (e.g.: qmail-queue from 
qmail). It may be this bug:

"executing ssh from inside valgrind fails"
<http://bugs.kde.org/show_bug.cgi?id=119404>

It's apparently fixed in the subversion trunk version of valgrind, 
although I haven't tried that.

Bye, Rich =]

-- 
Richard Dawe [ http://homepages.nildram.co.uk/~phekda/richdawe/ ]

"You can't evaluate a man by logic alone."
   -- McCoy, "I, Mudd", Star Trek