Andrew, this version follows all of your suggestions.  Definately nicer
userspace interface.  thanks

-serge

>From b7c210160e3c210d63eca532289ca1c9caf1bd87 Mon Sep 17 00:00:00 2001
From: Serge E. Hallyn <serue@us.ibm.com>
Date: Mon, 19 Nov 2007 13:54:05 -0500
Subject: [PATCH 1/1] capabilities: introduce per-process capability bounding set (v8)

The capability bounding set is a set beyond which capabilities
cannot grow.  Currently cap_bset is per-system.  It can be
manipulated through sysctl, but only init can add capabilities.
Root can remove capabilities.  By default it includes all caps
except CAP_SETPCAP.

This patch makes the bounding set per-process when file
capabilities are enabled.  It is inherited at fork from parent.
Noone can add elements, CAP_SETPCAP is required to remove them.

One example use of this is to start a safer container.  For
instance, until device namespaces or per-container device
whitelists are introduced, it is best to take CAP_MKNOD away
from a container.

The following test program will get and set the bounding
set.  For instance

	./bset get
		(lists capabilities in bset)
	./bset drop cap_net_raw
		(starts shell with new bset)
		(use capset, setuid binary, or binary with
		file capabilities to try to increase caps)

************************************************************
cap_bound.c
************************************************************
 #include <sys/prctl.h>
 #include <linux/capability.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #ifndef PR_CAPBSET_READ
 #define PR_CAPBSET_READ 23
 #endif

 #ifndef PR_CAPBSET_DROP
 #define PR_CAPBSET_DROP 24
 #endif

int usage(char *me)
{
	printf("Usage: %s get\n", me);
	printf("       %s drop <capability>\n", me);
	return 1;
}

 #define numcaps 32
char *captable[numcaps] = {
	"cap_chown",
	"cap_dac_override",
	"cap_dac_read_search",
	"cap_fowner",
	"cap_fsetid",
	"cap_kill",
	"cap_setgid",
	"cap_setuid",
	"cap_setpcap",
	"cap_linux_immutable",
	"cap_net_bind_service",
	"cap_net_broadcast",
	"cap_net_admin",
	"cap_net_raw",
	"cap_ipc_lock",
	"cap_ipc_owner",
	"cap_sys_module",
	"cap_sys_rawio",
	"cap_sys_chroot",
	"cap_sys_ptrace",
	"cap_sys_pacct",
	"cap_sys_admin",
	"cap_sys_boot",
	"cap_sys_nice",
	"cap_sys_resource",
	"cap_sys_time",
	"cap_sys_tty_config",
	"cap_mknod",
	"cap_lease",
	"cap_audit_write",
	"cap_audit_control",
	"cap_setfcap"
};

int getbcap(void)
{
	int comma=0;
	unsigned long i;
	int ret;

	printf("i know of %d capabilities\n", numcaps);
	printf("capability bounding set:");
	for (i=0; i<numcaps; i++) {
		ret = prctl(PR_CAPBSET_READ, i);
		if (ret < 0)
			perror("prctl");
		else if (ret==1)
			printf("%s%s", (comma++) ? ", " : " ", captable[i]);
	}
	printf("\n");
	return 0;
}

int capdrop(char *str)
{
	unsigned long i;

	int found=0;
	for (i=0; i<numcaps; i++) {
		if (strcmp(captable[i], str) == 0) {
			found=1;
			break;
		}
	}
	if (!found)
		return 1;
	if (prctl(PR_CAPBSET_DROP, i)) {
		perror("prctl");
		return 1;
	}
	return 0;
}

int main(int argc, char *argv[])
{
	if (argc<2)
		return usage(argv[0]);
	if (strcmp(argv[1], "get")==0)
		return getbcap();
	if (strcmp(argv[1], "drop")!=0 || argc<3)
		return usage(argv[0]);
	if (capdrop(argv[2])) {
		printf("unknown capability\n");
		return 1;
	}
	return execl("/bin/bash", "/bin/bash", NULL);
}
************************************************************

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
---
 include/linux/capability.h |   25 ++++++++++++++++++++++++-
 include/linux/init_task.h  |    1 +
 include/linux/prctl.h      |    4 ++++
 include/linux/sched.h      |    2 +-
 include/linux/security.h   |    5 -----
 include/linux/sysctl.h     |    3 ---
 kernel/fork.c              |    1 +
 kernel/sys.c               |    7 +++++++
 kernel/sysctl.c            |   35 -----------------------------------
 kernel/sysctl_check.c      |    7 -------
 security/commoncap.c       |   29 +++++++++++++++++++++++++----
 11 files changed, 63 insertions(+), 56 deletions(-)

diff --git a/include/linux/capability.h b/include/linux/capability.h
index a1d93da..94638b2 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -153,6 +153,7 @@ typedef struct kernel_cap_struct {
  *   remove any capability in your permitted set from any pid
  * With VFS support for capabilities (neither of above, but)
  *   Add any capability to the current process' inheritable set
+ *   Allow taking bits out of capability bounding set
  */
 
 #define CAP_SETPCAP          8
@@ -202,7 +203,6 @@ typedef struct kernel_cap_struct {
 #define CAP_IPC_OWNER        15
 
 /* Insert and remove kernel modules - modify kernel without limit */
-/* Modify cap_bset */
 #define CAP_SYS_MODULE       16
 
 /* Allow ioperm/iopl access */
@@ -314,6 +314,10 @@ typedef struct kernel_cap_struct {
 
 #define CAP_SETFCAP	     31
 
+#define CAP_NUM_CAPS         32
+
+#define cap_valid(x) ((x) >= 0 && (x) < CAP_NUM_CAPS)
+
 /*
  * Bit location of each capability (used by user-space library and kernel)
  */
@@ -350,6 +354,17 @@ typedef struct kernel_cap_struct {
 
 #define CAP_INIT_INH_SET    CAP_EMPTY_SET
 
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+/*
+ * Because of the reduced scope of CAP_SETPCAP when filesystem
+ * capabilities are in effect, it is safe to allow this capability to
+ * be available in the default configuration.
+ */
+# define CAP_INIT_BSET  CAP_FULL_SET
+#else
+# define CAP_INIT_BSET  CAP_INIT_EFF_SET
+#endif
+
 # define cap_clear(c)         do { (c) = __cap_empty_set; } while (0)
 # define cap_set_full(c)      do { (c) = __cap_full_set; } while (0)
 # define cap_set_init_eff(c)  do { (c) = __cap_init_eff_set; } while (0)
@@ -465,6 +480,14 @@ extern const kernel_cap_t __cap_init_eff_set;
 int capable(int cap);
 int __capable(struct task_struct *t, int cap);
 
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+extern long cap_prctl_drop(unsigned long cap);
+#else
+#include <linux/errno.h>
+static inline long cap_prctl_drop(unsigned long cap)
+{ return -EINVAL; }
+#endif
+
 #endif /* __KERNEL__ */
 
 #endif /* !_LINUX_CAPABILITY_H */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index cae35b6..5c84d14 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -147,6 +147,7 @@ extern struct group_info init_groups;
 	.cap_effective	= CAP_INIT_EFF_SET,				\
 	.cap_inheritable = CAP_INIT_INH_SET,				\
 	.cap_permitted	= CAP_FULL_SET,					\
+	.cap_bset 	= CAP_INIT_BSET,				\
 	.keep_capabilities = 0,						\
 	.user		= INIT_USER,					\
 	.comm		= "swapper",					\
diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index e2eff90..3800639 100644
--- a/include/linux/prctl.h
+++ b/include/linux/prctl.h
@@ -63,4 +63,8 @@
 #define PR_GET_SECCOMP	21
 #define PR_SET_SECCOMP	22
 
+/* Get/set the capability bounding set */
+#define PR_CAPBSET_READ 23
+#define PR_CAPBSET_DROP 24
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1d17f7c..bf51a16 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1041,7 +1041,7 @@ struct task_struct {
 	uid_t uid,euid,suid,fsuid;
 	gid_t gid,egid,sgid,fsgid;
 	struct group_info *group_info;
-	kernel_cap_t   cap_effective, cap_inheritable, cap_permitted;
+	kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
 	unsigned keep_capabilities:1;
 	struct user_struct *user;
 #ifdef CONFIG_KEYS
diff --git a/include/linux/security.h b/include/linux/security.h
index f771ad8..04b18f1 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -34,11 +34,6 @@
 #include <linux/xfrm.h>
 #include <net/flow.h>
 
-/*
- * Bounding set
- */
-extern kernel_cap_t cap_bset;
-
 extern unsigned securebits;
 
 struct ctl_table;
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 4f5047d..fa900cb 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -102,7 +102,6 @@ enum
 	KERN_NODENAME=7,
 	KERN_DOMAINNAME=8,
 
-	KERN_CAP_BSET=14,	/* int: capability bounding set */
 	KERN_PANIC=15,		/* int: panic timeout */
 	KERN_REALROOTDEV=16,	/* real root device to mount after initrd */
 
@@ -962,8 +961,6 @@ extern int proc_dostring(struct ctl_table *, int, struct file *,
 			 void __user *, size_t *, loff_t *);
 extern int proc_dointvec(struct ctl_table *, int, struct file *,
 			 void __user *, size_t *, loff_t *);
-extern int proc_dointvec_bset(struct ctl_table *, int, struct file *,
-			      void __user *, size_t *, loff_t *);
 extern int proc_dointvec_minmax(struct ctl_table *, int, struct file *,
 				void __user *, size_t *, loff_t *);
 extern int proc_dointvec_jiffies(struct ctl_table *, int, struct file *,
diff --git a/kernel/fork.c b/kernel/fork.c
index 5639b3e..9e4a5e1 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1087,6 +1087,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_SECURITY
 	p->security = NULL;
 #endif
+	p->cap_bset = current->cap_bset;
 	p->io_context = NULL;
 	p->audit_context = NULL;
 	cgroup_fork(p);
diff --git a/kernel/sys.c b/kernel/sys.c
index 4c77ed2..bed55dc 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1742,6 +1742,13 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			error = prctl_set_seccomp(arg2);
 			break;
 
+		case PR_CAPBSET_READ:
+			if (!cap_valid(arg2))
+				return -EINVAL;
+