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SECURITY: Move exec_permission RCU checks into security modules

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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>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen
2011-04-21 17:23:19 -07:00
committed by Linus Torvalds
parent 8d082f8f3f
commit 8c9e80ed27
5 changed files with 14 additions and 8 deletions
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6
security/security.c
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@@ -518,16 +518,14 @@ int security_inode_permission(struct inode *inode, int mask)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
return security_ops->inode_permission(inode, mask);
return security_ops->inode_permission(inode, mask, 0);
}
int security_inode_exec_permission(struct inode *inode, unsigned int flags)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
if (flags)
return -ECHILD;
return security_ops->inode_permission(inode, MAY_EXEC);
return security_ops->inode_permission(inode, MAY_EXEC, flags);
}
int security_inode_setattr(struct dentry *dentry, struct iattr *attr)