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Don't clobber user space argv0 memory on shell exec, mainly for vfork()

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Fix another bug: if argv[0] is NULL, garbadge args might be added for
shell script
Submitted by: Tor Egge <Tor.Egge@idi.ntnu.no> (with yet one fault detect from me)
This commit is contained in:
Andrey A. Chernov 1997-04-23 22:07:05 +00:00
parent a68c4b561f
commit 5cf3d12ca5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=25115
2 changed files with 26 additions and 17 deletions
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5
sys/kern/imgact_shell.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: imgact_shell.c,v 1.14 1997/02/22 09:38:57 peter Exp $
*/
#include <sys/param.h>
@ -126,8 +126,7 @@ exec_shell_imgact(imgp)
}
}
/* set argv[0] to point to original file name */
suword(imgp->uap->argv, (int)imgp->uap->fname);
imgp->argv0 = imgp->uap->fname;
return(0);
}

38
sys/kern/kern_exec.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: kern_exec.c,v 1.61 1997/04/13 03:05:31 dyson Exp $
* $Id: kern_exec.c,v 1.62 1997/04/18 02:43:05 davidg Exp $
*/
#include <sys/param.h>
@ -118,6 +118,7 @@ execve(p, uap, retval)
imgp->attr = &attr;
imgp->image_header = NULL;
imgp->argc = imgp->envc = 0;
imgp->argv0 = NULL;
imgp->entry_addr = 0;
imgp->vmspace_destroyed = 0;
imgp->interpreted = 0;
@ -435,20 +436,29 @@ exec_extract_strings(imgp)
argv = imgp->uap->argv;
if (argv) {
while ((argp = (caddr_t) fuword(argv++))) {
if (argp == (caddr_t) -1)
return (EFAULT);
if ((error = copyinstr(argp, imgp->stringp,
imgp->stringspace, &length))) {
if (error == ENAMETOOLONG)
return(E2BIG);
return (error);
}
imgp->stringspace -= length;
imgp->stringp += length;
imgp->argc++;
argp = (caddr_t) fuword(argv);
if (argp == (caddr_t) -1)
return (EFAULT);
if (argp)
argv++;
if (imgp->argv0)
argp = imgp->argv0;
if (argp) {
do {
if (argp == (caddr_t) -1)
return (EFAULT);
if ((error = copyinstr(argp, imgp->stringp,
imgp->stringspace, &length))) {
if (error == ENAMETOOLONG)
return(E2BIG);
return (error);
}
imgp->stringspace -= length;
imgp->stringp += length;
imgp->argc++;
} while ((argp = (caddr_t) fuword(argv++)));
}
}
}
/*
* extract environment strings