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authorDavid P. Quigley <dpquigl@tycho.nsa.gov>2009-09-09 14:25:37 -0400
committerJames Morris <jmorris@namei.org>2009-09-10 10:11:29 +1000
commitddd29ec6597125c830f7badb608a86c98b936b64 (patch)
treee6df1ef9a635179de78650d006ecb4cd1453ebb1 /security/selinux
parent1ee65e37e904b959c24404139f5752edc66319d5 (diff)
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sysfs: Add labeling support for sysfs
This patch adds a setxattr handler to the file, directory, and symlink inode_operations structures for sysfs. The patch uses hooks introduced in the previous patch to handle the getting and setting of security information for the sysfs inodes. As was suggested by Eric Biederman the struct iattr in the sysfs_dirent structure has been replaced by a structure which contains the iattr, secdata and secdata length to allow the changes to persist in the event that the inode representing the sysfs_dirent is evicted. Because sysfs only stores this information when a change is made all the optional data is moved into one dynamically allocated field. This patch addresses an issue where SELinux was denying virtd access to the PCI configuration entries in sysfs. The lack of setxattr handlers for sysfs required that a single label be assigned to all entries in sysfs. Granting virtd access to every entry in sysfs is not an acceptable solution so fine grained labeling of sysfs is required such that individual entries can be labeled appropriately. [sds: Fixed compile-time warnings, coding style, and setting of inode security init flags.] Signed-off-by: David P. Quigley <dpquigl@tycho.nsa.gov> Signed-off-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux')
-rw-r--r--security/selinux/hooks.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7118be2a74a..417f7c99452 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -448,6 +448,10 @@ static int sb_finish_set_opts(struct super_block *sb)
sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
sbsec->flags &= ~SE_SBLABELSUPP;
+ /* Special handling for sysfs. Is genfs but also has setxattr handler*/
+ if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
+ sbsec->flags |= SE_SBLABELSUPP;
+
/* Initialize the root inode. */
rc = inode_doinit_with_dentry(root_inode, root);
@@ -2923,6 +2927,7 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name,
return rc;
isec->sid = newsid;
+ isec->initialized = 1;
return 0;
}