Hi

Whenever I try to chroot (as root or any other user) to a directory (in this case /home/user), I get this error message:

chroot: cannot execute /bin/bash: No such file or directory


but bash IS in my /bin directory. I tried also making a /home/user/bin directory and putting bash in there, but that didn't work either.

Any suggestions?

damn you chroot! damn you!!

this problem begins to vex me greatly =)

The command should be located in /usr/sbin

Try to execute it like this logged in as root:

/usr/sbin/chroot

Oh and its not a problem with /bin/bash.. thats your shell. That error is just stating that bash couldn't execute chroot cause most likely it don't know where its at.

Also make sure that nothing silly has happened, like for instance, that file (/usr/sbin/chroot) has not been set as unexecutable... there's no reason that it shouldn't be executable, but it is still possible!

I've tried running it from /usr/sbin/chroot before and it does the same thing (yes, it is there).

I just chmod'd it to 777 and it still gives me the error, so it's not an executable permissions problem.

chroot also seems to be working, because I can do a '/usr/sbin/chroot /' and it executes with no errors (and transfers me to my / directory).

I know bash is the shell, but it seems like it's not chroot that's the problem maybe chroot is not able to find where bash is?.. I dunno, I'm guessing here).


<edit> I did this all logged in as root </edit>

And presumably the file /bin/bash exists? If not, then type find / -name "bash" and symlink that to /bin/bash and see if it helps.

Just a thought.

yeah, it's already in there

Did you populate the chroot jail using some howto or app?

If you execute
"strace -o /tmp/chroottrial-$$.log chroot <dirToChrootTo>"
you'll find near the bottom it'll say chroot(<dirToChrootTo>)
and the chdir(/). That's the point where it's going to look for a shell. execve(/bin/bash), depending on what the user has in <dirToChrootTo>/etc/passwd. The shell must reside within <dirToChrootTo>.

Go on, post a strace log, makes it easy...

Btw, I'm using Jail Chroot. Makes it easier for me to set up a chroot jail framework and I only have to tweak stuff after that a bit.

aha! I thought it sounded like it couldn't find bash... I didn't know I had to set up a shell in the dir I was chrooting to... it makes sense though ... so if I understand correctly, I just need to have a shell in the dir I'm chrooting to (bash in this case)?? (I'll give chroot jail a try)

My log follows:


execve("/usr/sbin/chroot", ["chroot", "/home/www"], [/* 23 vars */]) = 0
uname({sys="Linux", node="**MASKED**", ...}) = 0
brk(0) = 0x804b728
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=48773, ...}) = 0
old_mmap(NULL, 48773, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40012000
close(3) = 0
open("/lib/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0hU\1\000"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=1327065, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4001e000
old_mmap(NULL, 1171268, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4001f000
mprotect(0x40134000, 36676, PROT_NONE) = 0
old_mmap(0x40134000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x115000) = 0x40134000
old_mmap(0x40139000, 16196, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40139000
close(3) = 0
munmap(0x40012000, 48773) = 0
brk(0) = 0x804b728
brk(0x804c728) = 0x804c728
brk(0x804d000) = 0x804d000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=1830272, ...}) = 0
mmap2(NULL, 1830272, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4013d000
close(3) = 0
chroot("/home/www") = 0
chdir("/") = 0
execve("/bin/bash", ["/bin/bash", "-i"], [/* 23 vars */]) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/sh-utils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "chroot: ", 8) = 8
write(2, "cannot execute /bin/bash", 24) = 24
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, ": No such file or directory", 27) = 27
write(2, "\n", 1) = 1
_exit(1) = ?