X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fcapability.h;h=39e5ff512fbeab16280345eb3e54beb78e8ed0e7;hb=3d0bfbf25957e04354389047f0e6ba520d58487c;hp=4864a43b2b456e90c327644495f2b66011489479;hpb=76a67ec6fb79ff3570dcb5342142c16098299911;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/capability.h b/include/linux/capability.h
index 4864a43..39e5ff5 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -7,7 +7,7 @@
  *
  * See here for the libcap library ("POSIX draft" compliance):
  *
- * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
+ * ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
  */
 
 #ifndef _LINUX_CAPABILITY_H
@@ -92,9 +92,7 @@ struct vfs_cap_data {
 #define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
 #define _KERNEL_CAPABILITY_U32S    _LINUX_CAPABILITY_U32S_3
 
-#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
 extern int file_caps_enabled;
-#endif
 
 typedef struct kernel_cap_struct {
 	__u32 cap[_KERNEL_CAPABILITY_U32S];
@@ -377,7 +375,21 @@ struct cpu_vfs_cap_data {
 #define CAP_FOR_EACH_U32(__capi)  \
 	for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)
 
+/*
+ * CAP_FS_MASK and CAP_NFSD_MASKS:
+ *
+ * The fs mask is all the privileges that fsuid==0 historically meant.
+ * At one time in the past, that included CAP_MKNOD and CAP_LINUX_IMMUTABLE.
+ *
+ * It has never meant setting security.* and trusted.* xattrs.
+ *
+ * We could also define fsmask as follows:
+ *   1. CAP_FS_MASK is the privilege to bypass all fs-related DAC permissions
+ *   2. The security.* and trusted.* xattrs are fs-related MAC permissions
+ */
+
 # define CAP_FS_MASK_B0     (CAP_TO_MASK(CAP_CHOWN)		\
+			    | CAP_TO_MASK(CAP_MKNOD)		\
 			    | CAP_TO_MASK(CAP_DAC_OVERRIDE)	\
 			    | CAP_TO_MASK(CAP_DAC_READ_SEARCH)	\
 			    | CAP_TO_MASK(CAP_FOWNER)		\
@@ -392,11 +404,12 @@ struct cpu_vfs_cap_data {
 # 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_FS_MASK_B1 } })
+# define CAP_FS_SET       ((kernel_cap_t){{ CAP_FS_MASK_B0 \
+				    | CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
+				    CAP_FS_MASK_B1 } })
 # define CAP_NFSD_SET     ((kernel_cap_t){{ CAP_FS_MASK_B0 \
-					    | CAP_TO_MASK(CAP_SYS_RESOURCE) \
-					    | CAP_TO_MASK(CAP_MKNOD), \
-					    CAP_FS_MASK_B1 } })
+				    | CAP_TO_MASK(CAP_SYS_RESOURCE), \
+				    CAP_FS_MASK_B1 } })
 
 #endif /* _KERNEL_CAPABILITY_U32S != 2 */