[Systrace] Segfault

[marius aamodt eriksen]

* Stefan Pinkert <stpinkert at stpinkert.de> [040111 22:57]:

> First of all is there anywhere a short description of the command line options 
> of systrace? 

man systrace :-)

> Patching and compiling the kernel wasn't a problem and until now it runs 
> without any problems. The user-space tool was causing some problems but 
> finally i was able to get it compiled. The first run (systrace -A /bin/ls) 
> was successfull, but the second(systrace -f .systrace/bin_ls /bin/ls) died 
> with a segfault. From what i can see from the strace log it seem to have 
> problems with reading the policy file. Here are the corresponding lines from 
> strace: 

p.s. the -f option is not necessary; systrace will load
     $HOME/.systrace/POLICY automatically.

> open(".systrace/bin_ls", O_RDONLY)      = 3
> fstat64(3, {st_mode=S_IFREG|0600, st_size=1206, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
> 0x4001a000
> read(3, "Policy: /bin/ls, Emulation: linu"..., 4096) = 1206
> gettimeofday({1073871300, 815142}, NULL) = 0
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++

i am not able to replicate this problem; could you build systrace with
debugging turned on?

   $ make CFLAGS=-g

and then when it segfaults (and dumps core), run

   $ gdb `which systrace` systrace.core

you will then get a prompt

   (gdb)

can you then provide me with the output of the "bt" command there?
i.e.

   (gdb) bt

that would be tremendously helpful.

> The second problem i found is that i was not able to let pass any options to 
> ls (systrace -A /bin/ls -l). Systrace just killed the command.

systrace should allow for options to be passed on; it is possible this
problem is related with your first problem.

marius.

-- 
marius a eriksen <marius at monkey.org> | http://monkey.org/~marius/