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capabilities: do not drop CAP_SETPCAP from the initial task

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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: Eric Paris <eparis@redhat.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2011-04-01 17:08:34 -04:00 committed by James Morris
parent 4bf2ea77db
commit ffa8e59df0
2 changed files with 4 additions and 4 deletions
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6
include/linux/capability.h
View File

@ -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

2
kernel/capability.c
View File

@ -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;