Well, on i386, #47 getgid() is actually 16bit version of the call,
where powerpc seems to be connected directly to 'native' getgid(),
which returns 32bit value. I'm not sure if this is correct - did
Linux/ppc use 32bit gid_t from start ?

Jaromir

Emmanuel Dreyfus wrote:
> > That should at least tell if the syscall code matches getpid(2) or chown(2),
> > i.e. if the syscall number is passed correctly to kernel or not.
> 
> Here is what I get (I wrote the corresponding Linux syscall next to the
> code). Netscape (or at last glibc) really calls chown with setgid's
> arguments.
> 
> syscall: code=45        brk
> syscall: code=45        brk
> syscall: code=45        brk
> syscall: code=47        getgid
> syscall: code=181       chown   <<< should be setgid (46)
> syscall: code=24        getuid
> syscall: code=23        setuid
> syscall: code=42        pipe
> syscall: code=42        pipe
> syscall: code=2         fork
> 
> I digged a bit deeper, and there are other problems like this one later
> in the kernel trace
> mprotect turns into sethostname (we really don't expect Netscape to it)
> gettimeofday turns into sysinfo (what's this system call anyway? I don't
> have a man page on it)
> 
> Then Netscape gets a SIGSEGV, but it is a normal consequence: sysinfo
> must return a struct longer than the one used by gettimeofday, it
> overwrite some data on the stack, and when Netscape try to access them,
> it gets a SIGSEGV.
> 
> An idea: Linux RT signals are likely to be broken for now. I have not
> been able to find some documentation about rt_sigaction and friends,
> therefore I did not make any test program on it yet. In the source, I
> labeled linux_sys_rt_sigreturn as "XXX not tested". Netscape makes an
> intensive use of RT signals.
> 
> I wonder if stack corruption in linux_sys_rt_sigreturn could not lead to
> these strange problems?
> 
> -- 
> Emmanuel Dreyfus.  
> Hiroshima 45. Tchernobyl 86. Windows 95. 
> p99dreyf@criens.u-psud.fr     
> 


-- 
Jaromir Dolecek <jdolecek@NetBSD.org>      http://www.ics.muni.cz/~dolecek/
@@@@  Wanna a real operating system ? Go and get NetBSD, dammit!  @@@@