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note that even set -o noclobber can be coërced into dropping O_EXCL by a TOCTOU

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tg
2013-11-30 18:16:54 +00:00
parent 6217904193
commit 0dfbf3d314
1 changed files with 8 additions and 2 deletions
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mksh.1
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@@ -1,4 +1,4 @@
.\" $MirOS: src/bin/mksh/mksh.1,v 1.324 2013/11/17 22:24:06 tg Exp $ .\" $MirOS: src/bin/mksh/mksh.1,v 1.325 2013/11/30 18:16:54 tg Exp $
.\" $OpenBSD: ksh.1,v 1.148 2013/09/04 15:49:18 millert Exp $ .\" $OpenBSD: ksh.1,v 1.148 2013/09/04 15:49:18 millert Exp $
.\"- .\"-
.\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
@@ -74,7 +74,7 @@
.\" with -mandoc, it might implement .Mx itself, but we want to .\" with -mandoc, it might implement .Mx itself, but we want to
.\" use our own definition. And .Dd must come *first*, always. .\" use our own definition. And .Dd must come *first*, always.
.\" .\"
.Dd $Mdocdate: November 17 2013 $ .Dd $Mdocdate: November 30 2013 $
.\" .\"
.\" Check which macro package we use, and do other -mdoc setup. .\" Check which macro package we use, and do other -mdoc setup.
.\" .\"
@@ -4044,6 +4044,12 @@ Only used if job control is enabled
.It Fl C \*(Ba Fl o Ic noclobber .It Fl C \*(Ba Fl o Ic noclobber
Prevent \*(Gt redirection from overwriting existing files. Prevent \*(Gt redirection from overwriting existing files.
Instead, \*(Gt\*(Ba must be used to force an overwrite. Instead, \*(Gt\*(Ba must be used to force an overwrite.
Note that this is not safe to use for creation of temporary files or
lockfiles due to a TOCTOU in a check allowing one to redirect output to
.Pa /dev/null
or other device files even in
.Ic noclobber
mode.
.It Fl e \*(Ba Fl o Ic errexit .It Fl e \*(Ba Fl o Ic errexit
Exit (after executing the Exit (after executing the
.Dv ERR .Dv ERR