Comments on: flock before execve? http://dpk.net/2009/03/13/flock-before-execve/ oh you want the time travel spinning head? Fri, 10 Feb 2012 21:18:10 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: bad interpreter: Text file busy - Admins Goodies http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-107712 bad interpreter: Text file busy - Admins Goodies Wed, 24 Aug 2011 12:15:30 +0000 http://dpk.net/?p=488#comment-107712 [...] appear to be having this issue, which is because at some point nvi started opening files O_RDWR instead of [...] [...] appear to be having this issue, which is because at some point nvi started opening files O_RDWR instead of [...]

]]> By: jason http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-38535 jason Thu, 29 Oct 2009 19:19:42 +0000 http://dpk.net/?p=488#comment-38535 I'm getting the "text file busy" when trying to mv or rm a .htm file: server:/Scanned/OAO # rm ApplicationArchive.htm rm: remove regular file `ApplicationArchive.htm'? y rm: cannot remove `ApplicationArchive.htm': Text file busy why would this happen to a pure text file and not an executable. I’m getting the “text file busy” when trying to mv or rm a .htm file:
server:/Scanned/OAO # rm ApplicationArchive.htm
rm: remove regular file `ApplicationArchive.htm’? y
rm: cannot remove `ApplicationArchive.htm’: Text file busy

why would this happen to a pure text file and not an executable.

]]> By: dpk http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-29015 dpk Sat, 14 Mar 2009 14:32:06 +0000 http://dpk.net/?p=488#comment-29015 Could be. I've checked sysctl -a for lock, exec, etc. "bash shellscript -foo" works fine. FWIW, the same thing happens with csh, further pointing at the kernel. Edited: I think I've figured out what is going on (assuming the code I am looking at is the code that is in use). In fs/exec.c, do_exec() calls open_exec(), which calls deny_write_access(). That checks to see how many processes have the file open for writing, and if it is more than 0, it returns Text file busy. It's really old behavior, but I haven't seen it until now because previous versions of nvi would open the input file with O_RDONLY, and the new version opens it O_RDWR (confirmed with strace). You can duplicate the issue by running "cat >> shellscript" from the command line and them attempting to run the script in another window. The behavior seems to make more sense now (now that I know it's not flock, that is) from a security standpoint. Could be. I’ve checked sysctl -a for lock, exec, etc. “bash shellscript -foo” works fine. FWIW, the same thing happens with csh, further pointing at the kernel.

Edited: I think I’ve figured out what is going on (assuming the code I am looking at is the code that is in use). In fs/exec.c, do_exec() calls open_exec(), which calls deny_write_access(). That checks to see how many processes have the file open for writing, and if it is more than 0, it returns Text file busy.

It’s really old behavior, but I haven’t seen it until now because previous versions of nvi would open the input file with O_RDONLY, and the new version opens it O_RDWR (confirmed with strace).

You can duplicate the issue by running “cat >> shellscript” from the command line and them attempting to run the script in another window. The behavior seems to make more sense now (now that I know it’s not flock, that is) from a security standpoint.

]]> By: rone http://dpk.net/2009/03/13/flock-before-execve/comment-page-1/#comment-29009 rone Sat, 14 Mar 2009 07:00:32 +0000 http://dpk.net/?p=488#comment-29009 Hmm, sure it's not some security setting? Try 'bash shellscript -foo' and see if that works. I ran into this on some outsourced servers at work. Hmm, sure it’s not some security setting? Try ‘bash shellscript -foo’ and see if that works. I ran into this on some outsourced servers at work.

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