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-rw-r--r--include/linux/capability.h23
1 files changed, 20 insertions, 3 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 1b9872556131..c3021105edc0 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -377,7 +377,21 @@ struct cpu_vfs_cap_data {
377#define CAP_FOR_EACH_U32(__capi) \ 377#define CAP_FOR_EACH_U32(__capi) \
378 for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi) 378 for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)
379 379
380/*
381 * CAP_FS_MASK and CAP_NFSD_MASKS:
382 *
383 * The fs mask is all the privileges that fsuid==0 historically meant.
384 * At one time in the past, that included CAP_MKNOD and CAP_LINUX_IMMUTABLE.
385 *
386 * It has never meant setting security.* and trusted.* xattrs.
387 *
388 * We could also define fsmask as follows:
389 * 1. CAP_FS_MASK is the privilege to bypass all fs-related DAC permissions
390 * 2. The security.* and trusted.* xattrs are fs-related MAC permissions
391 */
392
380# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \ 393# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \
394 | CAP_TO_MASK(CAP_MKNOD) \
381 | CAP_TO_MASK(CAP_DAC_OVERRIDE) \ 395 | CAP_TO_MASK(CAP_DAC_OVERRIDE) \
382 | CAP_TO_MASK(CAP_DAC_READ_SEARCH) \ 396 | CAP_TO_MASK(CAP_DAC_READ_SEARCH) \
383 | CAP_TO_MASK(CAP_FOWNER) \ 397 | CAP_TO_MASK(CAP_FOWNER) \
@@ -392,9 +406,12 @@ struct cpu_vfs_cap_data {
392# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }}) 406# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
393# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }}) 407# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }})
394# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }}) 408# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
395# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0, CAP_FS_MASK_B1 } }) 409# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0 \
396# define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0|CAP_TO_MASK(CAP_SYS_RESOURCE), \ 410 | CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
397 CAP_FS_MASK_B1 } }) 411 CAP_FS_MASK_B1 } })
412# define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0 \
413 | CAP_TO_MASK(CAP_SYS_RESOURCE), \
414 CAP_FS_MASK_B1 } })
398 415
399#endif /* _KERNEL_CAPABILITY_U32S != 2 */ 416#endif /* _KERNEL_CAPABILITY_U32S != 2 */
400 417