capabilities: do not drop CAP_SETPCAP from the initial task

In olden' days of yore CAP_SETPCAP had special meaning for the init task.
We actually have code to make sure that CAP_SETPCAP wasn't in pE of things
using the init_cred.  But CAP_SETPCAP isn't so special any more and we
don't have a reason to special case dropping it for init or kthreads....
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NAndrew G. Morgan <morgan@kernel.org>
Signed-off-by: NJames Morris <jmorris@namei.org>

include/linux/capability.h

@@ -412,7 +412,6 @@ extern const kernel_cap_t __cap_init_eff_set;
 
 # define CAP_EMPTY_SET    ((kernel_cap_t){{ 0, 0 }})
 # define CAP_FULL_SET     ((kernel_cap_t){{ ~0, ~0 }})
-# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
 # define CAP_FS_SET       ((kernel_cap_t){{ CAP_FS_MASK_B0 \
 				    | CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
 				    CAP_FS_MASK_B1 } })
@@ -423,10 +422,10 @@ extern const kernel_cap_t __cap_init_eff_set;
 #endif /* _KERNEL_CAPABILITY_U32S != 2 */
 
 #define CAP_INIT_INH_SET    CAP_EMPTY_SET
+#define CAP_INIT_EFF_SET    CAP_FULL_SET
 
 # 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)
 
 #define cap_raise(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
 #define cap_lower(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
@@ -547,6 +546,9 @@ extern bool capable(int cap);
 extern bool ns_capable(struct user_namespace *ns, int cap);
 extern bool task_ns_capable(struct task_struct *t, int cap);
 
+extern const kernel_cap_t __cap_empty_set;
+extern const kernel_cap_t __cap_full_set;
+
 /**
  * nsown_capable - Check superior capability to one's own user_ns
  * @cap: The capability in question

kernel/capability.c

@@ -23,11 +23,9 @@
 
 const kernel_cap_t __cap_empty_set = CAP_EMPTY_SET;
 const kernel_cap_t __cap_full_set = CAP_FULL_SET;
-const kernel_cap_t __cap_init_eff_set = CAP_INIT_EFF_SET;
 
 EXPORT_SYMBOL(__cap_empty_set);
 EXPORT_SYMBOL(__cap_full_set);
-EXPORT_SYMBOL(__cap_init_eff_set);
 
 int file_caps_enabled = 1;