Java Visualizer not working Continuation of issue #6

[Lerissonf]

Hello, at first I have the same issue # 6 issue, I tried to solve with the tips you gave it. However I come across this error.

Can you help me?

[daveagp]

Is it working at the command line, following the documentation?

[Lerissonf]

Thanks for answering.

I followed the documentation. Even then the above example is not working on the command line.

presented the above error when I ran this example:

/var/www/html/safeexec/safeexec --chroot_dir . --exec_dir / --share_newnet --nproc 50 --mem 3000000 --nfile 30 --env_vars CLASSPATH=/cp/:/cp/javax.json-1.0.jar:/java/lib/tools.jar --exec /java/bin/java traceprinter.InMemory < cp/traceprinter/test-input.txt

[Lerissonf]

when I used example 1 it worked quietly. example 1:

./java/bin/java -cp .:cp:cp/javax.json-1.0.jar:java/lib/tools.jar traceprinter.InMemory < cp/traceprinter/test-input.txt

Output:

{"code":"public class Test { public static void main(String[] args) { int x = 4; x += x; } }","stdin":"","trace":[{"stdout":"","event":"call","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{},"ordered_varnames":[],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"1","frame_id":1}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{},"ordered_varnames":[],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"2","frame_id":2}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":4},"ordered_varnames":["x"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"4","frame_id":4}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":8},"ordered_varnames":["x"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"8","frame_id":8}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"return","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":8,"__return__":["VOID"]},"ordered_varnames":["x","__return__"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"9","frame_id":9}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}}],"userlog":"Debugger VM maxMemory: 1652M\n"}

[daveagp]

On face value, the error is saying that the file /var/www/html/java_jail/java/bin/java doesn't exist or isn't readable by the safeexec user. Do all users ("others") have permission to read/execute (list) the java_jail/java and java/bin folders as well as the bin/java executable?

It may be a bad idea to keep all this stuff in the html directory if you are planning to make a web server, because it makes it readable by the public.

[Lerissonf]

No, I just want to run offline.

When running this command without chroot that you suggested in issue # 6, it worked.

/var/www/html/safeexec/safeexec --share_newnet --nproc 50 --mem 30000000 --nfile 30 --env_vars CLASSPATH=./cp/:./cp/javax.json-1.0.jar:./java/lib/tools.jar --exec ./java/bin/java traceprinter.InMemory < cp/traceprinter/test-input.txt

Output:

{"code":"public class Test { public static void main(String[] args) { int x = 4; x += x; } }","stdin":"","trace":[{"stdout":"","event":"call","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{},"ordered_varnames":[],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"1","frame_id":1}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{},"ordered_varnames":[],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"2","frame_id":2}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":4},"ordered_varnames":["x"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"4","frame_id":4}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"step_line","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":8},"ordered_varnames":["x"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"8","frame_id":8}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}},{"stdout":"","event":"return","line":1,"stack_to_render":[{"func_name":"main:1","encoded_locals":{"x":8,"__return__":["VOID"]},"ordered_varnames":["x","__return__"],"parent_frame_id_list":[],"is_highlighted":true,"is_zombie":false,"is_parent":false,"unique_hash":"9","frame_id":9}],"globals":{},"ordered_globals":[],"func_name":"main","heap":{}}],"userlog":"Debugger VM maxMemory: 1652M\n"}OK
elapsed time: 5 seconds
memory usage: 286476 kbytes
cpu usage: 7.776 seconds

[Lerissonf]

I run this command:

sudo strace -f /var/www/html/safeexec/safeexec --chroot_dir /var/www/html/java_jail --exec_dir / --share_newnet --nproc 50 --mem 30000000 --nfile 30 --env_vars CLASSPATH=./cp/:./cp/javax.json-1.0.jar:./java/lib/tools.jar --exec ./java/bin/java traceprinter.InMemory < /var/www/html/java_jail/cp/traceprinter/test-input.txt

Output:

execve("/var/www/html/safeexec/safeexec", ["/var/www/html/safeexec/safeexec", "--chroot_dir", "/var/www/html/java_jail", "--exec_dir", "/", "--share_newnet", "--nproc", "50", "--mem", "30000000", "--nfile", "30", "--env_vars", "CLASSPATH=./cp/:./cp/javax.json-"..., "--exec", "./java/bin/java", ...], [/* 17 vars */]) = 0
brk(NULL)                               = 0x1ccc000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0425ce6000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=90903, ...}) = 0
mmap(NULL, 90903, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0425ccf000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1868984, ...}) = 0
mmap(NULL, 3971488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f04256f9000
mprotect(0x7f04258b9000, 2097152, PROT_NONE) = 0
mmap(0x7f0425ab9000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f0425ab9000
mmap(0x7f0425abf000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0425abf000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0425cce000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0425ccd000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0425ccc000
arch_prctl(ARCH_SET_FS, 0x7f0425ccd700) = 0
mprotect(0x7f0425ab9000, 16384, PROT_READ) = 0
mprotect(0x604000, 4096, PROT_READ)     = 0
mprotect(0x7f0425ce8000, 4096, PROT_READ) = 0
munmap(0x7f0425ccf000, 90903)           = 0
rt_sigaction(SIGPIPE, {SIG_DFL, [], SA_RESTORER, 0x7f042572e4b0}, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGPIPE, {SIG_DFL, [], SA_RESTORER, 0x7f042572e4b0}, {SIG_DFL, [], SA_RESTORER, 0x7f042572e4b0}, 8) = 0
getpid()                                = 12260
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f0425ccd9d0) = 12261
strace: Process 12261 attached
[pid 12260] rt_sigaction(SIGALRM, {0x402129, [ALRM], SA_RESTORER|SA_RESTART, 0x7f042572e4b0}, {SIG_DFL, [], 0}, 8) = 0
[pid 12260] alarm(60)                   = 0
[pid 12260] select(0, NULL, NULL, NULL, {0, 67000} <unfinished ...>
[pid 12261] setrlimit(RLIMIT_AS, {rlim_cur=30000000*1024, rlim_max=30000000*1024}) = 0
[pid 12261] setrlimit(RLIMIT_DATA, {rlim_cur=30000000*1024, rlim_max=30000000*1024}) = 0
[pid 12261] setrlimit(RLIMIT_CORE, {rlim_cur=0, rlim_max=0}) = 0
[pid 12261] setrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=8192*1024}) = 0
[pid 12261] setrlimit(RLIMIT_FSIZE, {rlim_cur=0, rlim_max=0}) = 0
[pid 12261] setrlimit(RLIMIT_CPU, {rlim_cur=10, rlim_max=10}) = 0
[pid 12261] setrlimit(RLIMIT_NOFILE, {rlim_cur=30, rlim_max=30}) = 0
[pid 12261] setrlimit(RLIMIT_NPROC, {rlim_cur=51, rlim_max=51}) = 0
[pid 12261] chdir("/var/www/html/java_jail") = 0
[pid 12261] chroot(".")                 = 0
[pid 12261] chdir("/")                  = 0
[pid 12261] setpriority(PRIO_PROCESS, 12261, 16) = 0
[pid 12261] unshare(CLONE_FS|CLONE_FILES|CLONE_NEWNS|CLONE_SYSVSEM|CLONE_NEWUTS|CLONE_NEWIPC) = 0
[pid 12261] setsid()                    = 12261
[pid 12261] setgid(1000)                = 0
[pid 12261] getgid()                    = 1000
[pid 12261] setgroups(0, [])            = 0
[pid 12261] getgroups(0, NULL)          = 0
[pid 12261] setuid(22260)               = 0
[pid 12261] getuid()                    = 22260
[pid 12261] execve("./java/bin/java", ["./java/bin/java", "traceprinter.InMemory"], [/* 1 var */]) = -1 ENOENT (No such file or directory)
[pid 12261] write(2, "error 2 (No such file or directo"..., 37error 2 (No such file or directory): ) = 37
[pid 12261] write(2, "execve error\n", 13execve error
) = 13
[pid 12261] write(2, "\n", 1
)           = 1
[pid 12261] exit_group(1)               = ?
[pid 12261] +++ exited with 1 +++
<... select resumed> )                  = ? ERESTARTNOHAND (To be restarted if no handler)
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12261, si_uid=22260, si_status=1, si_utime=0, si_stime=0} ---
select(0, NULL, NULL, NULL, {0, 10724}) = 0 (Timeout)
open("/proc/12261/status", O_RDONLY)    = 3
read(3, "Name:\tsafeexec\nState:\tZ (zombie)"..., 8192) = 937
close(3)                                = 0
wait4(12261, [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], WNOHANG|WSTOPPED, {ru_utime={0, 0}, ru_stime={0, 0}, ...}) = 12261
write(2, "Command exited with non-zero sta"..., 40Command exited with non-zero status (1)
) = 40
write(2, "elapsed time: 0 seconds\n", 24elapsed time: 0 seconds
) = 24
write(2, "memory usage: 0 kbytes\n", 23memory usage: 0 kbytes
) = 23
write(2, "cpu usage: 0.000 seconds\n", 25cpu usage: 0.000 seconds
) = 25
setgid(1000)                            = 0
getgid()                                = 1000
setgroups(0, [])                        = 0
getgroups(0, NULL)                      = 0
setuid(22260)                           = 0
getuid()                                = 22260
getuid()                                = 22260
getuid()                                = 22260
geteuid()                               = 22260
geteuid()                               = 22260
getgid()                                = 1000
getgid()                                = 1000
kill(4294967295, SIGKILL)               = 0
close(2)                                = 0
exit_group(1)                           = ?
+++ exited with 1 +++

I noticed that with chroot it does not find this file:

execve("./java/bin/java", ["./java/bin/java", "traceprinter.InMemory"], [/* 1 var */]) = -1 ENOENT (No such file or directory)

[daveagp]

What if you put some other simple test binary there (like a compiled C++ hello world) in the bin folder? Does this command work if you do java/bin/hello instead of java/bin/java?