Author: kib
Date: Sun Mar 13 09:36:52 2011
New Revision: 219594
URL: http://svn.freebsd.org/changeset/base/219594
Log:
MFC r219352:
The execution of the shebang script requires putting interpreter path,
possible option and script path in the place of argv[0] supplied to
execve(2). It is possible and valid for the substitution to be shorter
then the argv[0].
Avoid signed underflow in this case.
PR: kern/155321
Modified:
stable/8/sys/kern/imgact_shell.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/kern/imgact_shell.c
==============================================================================
--- stable/8/sys/kern/imgact_shell.c Sun Mar 13 08:59:46 2011
(r219593)
+++ stable/8/sys/kern/imgact_shell.c Sun Mar 13 09:36:52 2011
(r219594)
@@ -191,7 +191,7 @@ exec_shell_imgact(imgp)
length = (imgp->args->argc == 0) ? 0 :
strlen(imgp->args->begin_argv) + 1; /* bytes to delete */
- if (offset - length > imgp->args->stringspace) {
+ if (offset > imgp->args->stringspace + length) {
if (sname != NULL)
sbuf_delete(sname);
return (E2BIG);
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