diff --git a/include/linux/capability.h b/include/linux/capability.h
index 8961e7fb755c..7a8d7ade28a0 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -310,10 +310,6 @@ typedef __u32 kernel_cap_t;
#define CAP_SETFCAP 31
#ifdef __KERNEL__
-/*
- * Bounding set
- */
-extern kernel_cap_t cap_bset;
/*
* Internal kernel functions only
diff --git a/include/linux/security.h b/include/linux/security.h
index 9b0b63c50f44..ff3f857f6957 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -34,6 +34,13 @@
#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/kernel/capability.c b/kernel/capability.c
index 4e350a36ed6a..14853be5944d 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 1997 Andrew Main <zefram@fysh.org>
*
- * Integrated into 2.1.97+, Andrew G. Morgan <morgan@transmeta.com>
+ * Integrated into 2.1.97+, Andrew G. Morgan <morgan@kernel.org>
* 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
*/
@@ -14,9 +14,6 @@
#include <linux/syscalls.h>
#include <asm/uaccess.h>
-unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
-kernel_cap_t cap_bset = CAP_INIT_EFF_SET;
-
/*
* This lock protects task->cap_* for all tasks including current.
* Locking rule: acquire this prior to tasklist_lock.
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c25e67e19af7..067554bda8b7 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -24,7 +24,7 @@
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
-#include <linux/capability.h>
+#include <linux/security.h>
#include <linux/ctype.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
@@ -371,6 +371,7 @@ static struct ctl_table kern_table[] = {
.proc_handler = &proc_dointvec_taint,
},
#endif
+#ifdef CONFIG_SECURITY_CAPABILITIES
{
.procname = "cap-bound",
.data = &cap_bset,
@@ -378,6 +379,7 @@ static struct ctl_table kern_table[] = {
.mode = 0600,
.proc_handler = &proc_dointvec_bset,
},
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
#ifdef CONFIG_BLK_DEV_INITRD
{
.ctl_name = KERN_REALROOTDEV,
@@ -1872,10 +1874,11 @@ static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
return 0;
}
+#ifdef CONFIG_SECURITY_CAPABILITIES
/*
* init may raise the set.
*/
-
+
int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -1889,6 +1892,7 @@ int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
do_proc_dointvec_bset_conv,&op);
}
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
/*
* Taint values can only be increased
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index f47c33d17032..3c9ef5a7d575 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -38,7 +38,10 @@ static struct trans_ctl_table trans_kern_table[] = {
{ KERN_NODENAME, "hostname" },
{ KERN_DOMAINNAME, "domainname" },
+#ifdef CONFIG_SECURITY_CAPABILITIES
{ KERN_CAP_BSET, "cap-bound" },
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
+
{ KERN_PANIC, "panic" },
{ KERN_REALROOTDEV, "real-root-dev" },
@@ -1532,7 +1535,9 @@ int sysctl_check_table(struct ctl_table *table)
(table->strategy == sysctl_ms_jiffies) ||
(table->proc_handler == proc_dostring) ||
(table->proc_handler == proc_dointvec) ||
+#ifdef CONFIG_SECURITY_CAPABILITIES
(table->proc_handler == proc_dointvec_bset) ||
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
(table->proc_handler == proc_dointvec_minmax) ||
(table->proc_handler == proc_dointvec_jiffies) ||
(table->proc_handler == proc_dointvec_userhz_jiffies) ||
diff --git a/security/commoncap.c b/security/commoncap.c
index 778cb0cfc5d8..48ca5b092768 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -24,6 +24,25 @@
#include <linux/hugetlb.h>
#include <linux/mount.h>
+#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 /* ie. ndef CONFIG_SECURITY_FILE_CAPABILITIES */
+# define CAP_INIT_BSET CAP_INIT_EFF_SET
+#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
+
+kernel_cap_t cap_bset = CAP_INIT_BSET; /* systemwide capability bound */
+EXPORT_SYMBOL(cap_bset);
+
+/* Global security state */
+
+unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
+EXPORT_SYMBOL(securebits);
+
int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
{
NETLINK_CB(skb).eff_cap = current->cap_effective;
@@ -73,14 +92,44 @@ int cap_capget (struct task_struct *target, kernel_cap_t *effective,
return 0;
}
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+
+static inline int cap_block_setpcap(struct task_struct *target)
+{
+ /*
+ * No support for remote process capability manipulation with
+ * filesystem capability support.
+ */
+ return (target != current);
+}
+
+static inline int cap_inh_is_capped(void)
+{
+ /*
+ * return 1 if changes to the inheritable set are limited
+ * to the old permitted set.
+ */
+ return !cap_capable(current, CAP_SETPCAP);
+}
+
+#else /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
+
+static inline int cap_block_setpcap(struct task_struct *t) { return 0; }
+static inline int cap_inh_is_capped(void) { return 1; }
+
+#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
+
int cap_capset_check (struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
- /* Derived from kernel/capability.c:sys_capset. */
- /* verify restrictions on target's new Inheritable set */
- if (!cap_issubset (*inheritable,
- cap_combine (target->cap_inheritable,
- current->cap_permitted))) {
+ if (cap_block_setpcap(target)) {
+ return -EPERM;
+ }
+ if (cap_inh_is_capped()
+ && !cap_issubset(*inheritable,
+ cap_combine(target->cap_inheritable,
+ current->cap_permitted))) {
+ /* incapable of using this inheritable set */
return -EPERM;
}
diff --git a/security/dummy.c b/security/dummy.c
index bc43d4c7383e..6d895ade73de 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -37,15 +37,13 @@ static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
kernel_cap_t * inheritable, kernel_cap_t * permitted)
{
*effective = *inheritable = *permitted = 0;
- if (!issecure(SECURE_NOROOT)) {
- if (target->euid == 0) {
- *permitted |= (~0 & ~CAP_FS_MASK);
- *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
- }
- if (target->fsuid == 0) {
- *permitted |= CAP_FS_MASK;
- *effective |= CAP_FS_MASK;
- }
+ if (target->euid == 0) {
+ *permitted |= (~0 & ~CAP_FS_MASK);
+ *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
+ }
+ if (target->fsuid == 0) {
+ *permitted |= CAP_FS_MASK;
+ *effective |= CAP_FS_MASK;
}
return 0;
}