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authorAndi Kleen <ak@linux.intel.com>2011-04-21 17:23:19 -0700
committerEric Paris <eparis@redhat.com>2011-04-25 10:20:32 -0400
commit1c9904297451f558191e211a48d8838b4bf792b0 (patch)
tree9c7cabec6ce3d6604147de73953cfaca672f1c0d /security/smack
parent6b697323a78bed254ee372f71b1a6a2901bb4b7a (diff)
downloadvexpress-lsk-1c9904297451f558191e211a48d8838b4bf792b0.tar.gz
SECURITY: Move exec_permission RCU checks into security modules
Right now all RCU walks fall back to reference walk when CONFIG_SECURITY is enabled, even though just the standard capability module is active. This is because security_inode_exec_permission unconditionally fails RCU walks. Move this decision to the low level security module. This requires passing the RCU flags down the security hook. This way at least the capability module and a few easy cases in selinux/smack work with RCU walks with CONFIG_SECURITY=y Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack_lsm.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 23c7a6d0c80..42fcb47747a 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -686,7 +686,7 @@ static int smack_inode_rename(struct inode *old_inode,
*
* Returns 0 if access is permitted, -EACCES otherwise
*/
-static int smack_inode_permission(struct inode *inode, int mask)
+static int smack_inode_permission(struct inode *inode, int mask, unsigned flags)
{
struct smk_audit_info ad;
@@ -696,6 +696,10 @@ static int smack_inode_permission(struct inode *inode, int mask)
*/
if (mask == 0)
return 0;
+
+ /* May be droppable after audit */
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
smk_ad_setfield_u_fs_inode(&ad, inode);
return smk_curacc(smk_of_inode(inode), mask, &ad);