svn commit: r310143 - head/usr.bin/hexdump
Conrad E. Meyer
cem at FreeBSD.org
Fri Dec 16 02:03:41 UTC 2016
Author: cem
Date: Fri Dec 16 02:03:40 2016
New Revision: 310143
URL: https://svnweb.freebsd.org/changeset/base/310143
Log:
hexdump(1): First cut capsicumification
For now, only enter the sandbox for the last file processed (including
stdin for zero-argument mode).
Sandboxing all inputs will require a little restructuring of the
program.
Feedback by: emaste@ (earlier versions)
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D7915
Modified:
head/usr.bin/hexdump/display.c
head/usr.bin/hexdump/hexdump.c
Modified: head/usr.bin/hexdump/display.c
==============================================================================
--- head/usr.bin/hexdump/display.c Fri Dec 16 01:59:28 2016 (r310142)
+++ head/usr.bin/hexdump/display.c Fri Dec 16 02:03:40 2016 (r310143)
@@ -36,10 +36,13 @@ static char sccsid[] = "@(#)display.c 8.
__FBSDID("$FreeBSD$");
#include <sys/param.h>
+#include <sys/capsicum.h>
#include <sys/stat.h>
+#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -355,6 +358,19 @@ next(char **argv)
return(0);
statok = 0;
}
+
+ if (caph_limit_stream(fileno(stdin), CAPH_READ) < 0)
+ err(1, "unable to restrict %s",
+ statok ? _argv[-1] : "stdin");
+
+ /*
+ * We've opened our last input file; enter capsicum sandbox.
+ */
+ if (*_argv == NULL) {
+ if (cap_enter() < 0 && errno != ENOSYS)
+ err(1, "unable to enter capability mode");
+ }
+
if (skip)
doskip(statok ? *_argv : "stdin", statok);
if (*_argv)
Modified: head/usr.bin/hexdump/hexdump.c
==============================================================================
--- head/usr.bin/hexdump/hexdump.c Fri Dec 16 01:59:28 2016 (r310142)
+++ head/usr.bin/hexdump/hexdump.c Fri Dec 16 02:03:40 2016 (r310143)
@@ -42,6 +42,9 @@ static char sccsid[] = "@(#)hexdump.c 8.
__FBSDID("$FreeBSD$");
#include <sys/types.h>
+#include <sys/capsicum.h>
+#include <capsicum_helpers.h>
+#include <err.h>
#include <locale.h>
#include <stdlib.h>
#include <stdio.h>
@@ -76,6 +79,14 @@ main(int argc, char *argv[])
for (tfs = fshead; tfs; tfs = tfs->nextfs)
rewrite(tfs);
+ /*
+ * Cache NLS data, for strerror, for err(3), before entering capability
+ * mode.
+ */
+ caph_cache_catpages();
+ if (caph_limit_stdio() < 0)
+ err(1, "capsicum");
+
(void)next(argv);
display();
exit(exitval);
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