ZFS ACLS and vim Post: 302938938

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Operating Systems Solaris ZFS ACLS and vim Post 302938938 by achenle on Friday 20th of March 2015 07:11:51 AM

03-20-2015

Registered User

The chmod() at 2.7074 is probably the culprit.

You can start up this dtrace script as root, then use vim to cause ACLs to disappear:

Code:

#!/usr/sbin/dtrace -s

#pragma D option flowindent

syscall::fchmodat:entry
/execname=="vim"/
{
    printf( "%s, 0x%x\n", execname, arg1 );
    self->trace = 1;
}

syscall::fchmodat:return
/self->trace/
{
    self->trace = 0;
}

fbt:::
/self->trace/
{
}

That'll show what's going on under the hood.

To verify that it's indeed that chmod() call that's blowing away the ACLs, take this C code:

Code:

int chmod( const char *name, unsigned int mode )
{
    return( 0 );
}

Compile it:

Code:

gcc -m32 -shared chmod.c -o chmod.so (gcc)

Code:

cc -G chmod.c -o chmod.so (Sun Studio)

Set your LD_PRELOAD_32:

Code:

export LD_PRELOAD_32=/path/to/chmod.so

Rerun vim from the same shell you set LD_PRELOAD_32 in.

If the ACLs are preserved, it's a bug in vim.

Oh yeah - don't do anything else from the bash session where you have the LD_PRELOAD set. Things aren't going to behave well with chmod() stubbed out like that.

And I recommend you never, ever use just plain "LD_PRELOAD" on Solaris. Always use LD_PRELOAD_32 or LD_PRELOAD_64. If a 32-bit binary hits a 64-bit shared object in LD_PRELOAD, or the other way around, it won't run.

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LEARN ABOUT PHP

chmod

CHMOD(3)								 1								  CHMOD(3)

chmod - Changes file mode

SYNOPSIS

       bool chmod (string  $filename, int  $mode)

DESCRIPTION

	Attempts to change the mode of the specified file to that given in $mode.

PARAMETERS

	      o $filename
		- Path to the file.

	      o $mode
		- Note that $mode is not automatically assumed to be an octal value, so to ensure the expected operation, you need to prefix $mode
		with a zero (0). Strings such as "g+w" will not work properly.

	      <?php
	      chmod("/somedir/somefile", 755);	 // decimal; probably incorrect
	      chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect
	      chmod("/somedir/somefile", 0755);  // octal; correct value of mode
	      ?>
	      man 1 chmod' and ' man 2 chmod'.

	      <?php
	      // Read and write for owner, nothing for everybody else
	      chmod("/somedir/somefile", 0600);

	      // Read and write for owner, read for everybody else
	      chmod("/somedir/somefile", 0644);

	      // Everything for owner, read and execute for others
	      chmod("/somedir/somefile", 0755);

	      // Everything for owner, read and execute for owner's group
	      chmod("/somedir/somefile", 0750);
	      ?>

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

NOTES

       Note

	       The current user is the user under which PHP runs. It is probably not the same user you use for normal shell  or  FTP  access.  The
	      mode can be changed only by user who owns the file on most systems.

       Note

	      This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.

       Note

	       When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the
	      script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits.

SEE ALSO

       chown(3), chgrp(3), fileperms(3), stat(3).

PHP Documentation Group 														  CHMOD(3)

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LEARN ABOUT PHP

chmod