KVM: MMU: invalidate and flush on spte small->large page size change

[safe/jmp/linux-2.6] / kernel / capability.c

diff --git a/kernel/capability.c b/kernel/capability.c
index 4e17041..2f05303 100644 (file)
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -15,7 +15,6 @@
 #include <linux/syscalls.h>
 #include <linux/pid_namespace.h>
 #include <asm/uaccess.h>
-#include "cred-internals.h"
 
 /*
  * Leveraged for setting/resetting capabilities
@@ -29,7 +28,6 @@ EXPORT_SYMBOL(__cap_empty_set);
 EXPORT_SYMBOL(__cap_full_set);
 EXPORT_SYMBOL(__cap_init_eff_set);
 
-#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
 int file_caps_enabled = 1;
 
 static int __init file_caps_disable(char *str)
@@ -38,7 +36,6 @@ static int __init file_caps_disable(char *str)
        return 1;
 }
 __setup("no_file_caps", file_caps_disable);
-#endif
 
 /*
  * More recent versions of libcap are available from:
@@ -137,7 +134,7 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
        if (pid && (pid != task_pid_vnr(current))) {
                struct task_struct *target;
 
-               read_lock(&tasklist_lock);
+               rcu_read_lock();
 
                target = find_task_by_vpid(pid);
                if (!target)
@@ -145,7 +142,7 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
                else
                        ret = security_capget(target, pEp, pIp, pPp);
 
-               read_unlock(&tasklist_lock);
+               rcu_read_unlock();
        } else
                ret = security_capget(current, pEp, pIp, pPp);
 
@@ -169,8 +166,8 @@ SYSCALL_DEFINE2(capget, cap_user_header_t, header, cap_user_data_t, dataptr)
        kernel_cap_t pE, pI, pP;
 
        ret = cap_validate_magic(header, &tocopy);
-       if (ret != 0)
-               return ret;
+       if ((dataptr == NULL) || (ret != 0))
+               return ((dataptr == NULL) && (ret == -EINVAL)) ? 0 : ret;
 
        if (get_user(pid, &header->pid))
                return -EFAULT;
@@ -238,7 +235,7 @@ SYSCALL_DEFINE2(capget, cap_user_header_t, header, cap_user_data_t, dataptr)
 SYSCALL_DEFINE2(capset, cap_user_header_t, header, const cap_user_data_t, data)
 {
        struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
-       unsigned i, tocopy;
+       unsigned i, tocopy, copybytes;
        kernel_cap_t inheritable, permitted, effective;
        struct cred *new;
        int ret;
@@ -255,8 +252,11 @@ SYSCALL_DEFINE2(capset, cap_user_header_t, header, const cap_user_data_t, data)
        if (pid != 0 && pid != task_pid_vnr(current))
                return -EPERM;
 
-       if (copy_from_user(&kdata, data,
-                          tocopy * sizeof(struct __user_cap_data_struct)))
+       copybytes = tocopy * sizeof(struct __user_cap_data_struct);
+       if (copybytes > sizeof(kdata))
+               return -EFAULT;
+
+       if (copy_from_user(&kdata, data, copybytes))
                return -EFAULT;
 
        for (i = 0; i < tocopy; i++) {