[git commit] setpriv: dump capability bounding set

Denys Vlasenko vda.linux at googlemail.com
Thu Jul 6 20:59:23 UTC 2017


commit: https://git.busybox.net/busybox/commit/?id=f34c701fa8ac90e900488453b8efbe93a1378280
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

As with the previous commit, this one implements the ability to dump the
capability bounding set.

function                                             old     new   delta
setpriv_main                                         838     982    +144
.rodata                                           146101  146148     +47

Signed-off-by: Patrick Steinhardt <ps at pks.im>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 util-linux/setpriv.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index a509204..c3f9ea1 100644
--- a/util-linux/setpriv.c
+++ b/util-linux/setpriv.c
@@ -82,6 +82,10 @@
 #include <sys/prctl.h>
 #include "libbb.h"
 
+#ifndef PR_CAPBSET_READ
+#define PR_CAPBSET_READ 23
+#endif
+
 #ifndef PR_SET_NO_NEW_PRIVS
 #define PR_SET_NO_NEW_PRIVS 38
 #endif
@@ -247,6 +251,25 @@ static int dump(void)
 	}
 	if (!fmt[0])
 		printf("[none]");
+
+	printf("\nCapability bounding set: ");
+	fmt = "";
+	for (i = 0; cap_valid(i); i++) {
+		int ret = prctl(PR_CAPBSET_READ, (unsigned long) i, 0UL, 0UL, 0UL);
+		if (ret < 0)
+			bb_simple_perror_msg_and_die("prctl: CAPBSET_READ");
+		if (ret) {
+#  if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
+			if (i < ARRAY_SIZE(capabilities))
+				printf("%s%s", fmt, capabilities[i]);
+			else
+#  endif
+				printf("%scap_%u", fmt, i);
+			fmt = ",";
+		}
+	}
+	if (!fmt[0])
+		printf("[none]");
 	bb_putchar('\n');
 # endif
 


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