Messages in this thread | | | Subject | Re: [PATCH 4/4] integrity: IMA radix tree | From | Mimi Zohar <> | Date | Mon, 17 Nov 2008 14:05:36 -0500 |
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On Fri, 2008-11-14 at 14:15 -0800, Andrew Morton wrote: > On Wed, 12 Nov 2008 22:47:14 -0500 > Mimi Zohar <zohar@linux.vnet.ibm.com> wrote: > > > This version stores integrity information associated with an inode > > in a radix tree in order to avoid bloating the in memory inode. > > As entries can not be added to the radix tree at security_initcall, > > this version removes the dual stage initialization. Allocating and > > freeing the memory continues to be done at inode_alloc and file_free, > > respectively, except for inodes created before late_initcall. > > > > Signed-off-by: Mimi Zohar <zohar@us.ibm.com> > > --- > > diff --git a/include/linux/fs.h b/include/linux/fs.h > > index bc6460c..0dcdd94 100644 > > --- a/include/linux/fs.h > > +++ b/include/linux/fs.h > > @@ -683,9 +683,6 @@ struct inode { > > #ifdef CONFIG_SECURITY > > void *i_security; > > #endif > > -#ifdef CONFIG_INTEGRITY > > - void *i_integrity; > > -#endif > > ah, I was going to ask about that..
Hm, perhaps posting as a separate patch was not such a good idea.
> > void *i_private; /* fs or device private pointer */ > > }; > > > > diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile > > index f3aced4..959ae66 100644 > > --- a/security/integrity/ima/Makefile > > +++ b/security/integrity/ima/Makefile > > @@ -6,4 +6,4 @@ > > obj-$(CONFIG_IMA) += ima.o > > > > ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \ > > - ima_policy.o > > + ima_policy.o ima_iint.o > > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > > index 9a24305..09a5e1a 100644 > > --- a/security/integrity/ima/ima.h > > +++ b/security/integrity/ima/ima.h > > @@ -92,7 +92,6 @@ void ima_store_measurement(void *d); > > void ima_template_show(struct seq_file *m, void *e, > > enum integrity_show_type show); > > > > - > > /* > > * used to protect h_table and sha_table > > */ > > @@ -109,7 +108,7 @@ extern struct ima_h_table ima_htable; > > > > static inline unsigned long IMA_HASH_KEY(u8 *digest) > > { > > - return(hash_long(*digest, IMA_HASH_BITS)); > > + return (hash_long(*digest, IMA_HASH_BITS)); > > And I _did_ ask about that ;) Definitely better now.
> > } > > > > /* TPM "Glue" definitions */ > > @@ -145,11 +144,36 @@ struct ima_iint_cache { > > u8 hmac[IMA_DIGEST_SIZE]; > > u8 digest[IMA_DIGEST_SIZE]; > > struct mutex mutex; > > + atomic_t refcount; > > }; > > #define IMA_IINT_INIT 1 > > #define IMA_MUST_MEASURE 2 > > #define IMA_MEASURED 4 > > > > +void ima_iint_init(void); > > +struct ima_iint_cache * ima_iint_lookup(struct inode *inode); > > checkpatch... > > > > ... > > > > --- /dev/null > > +++ b/security/integrity/ima/ima_iint.c > > @@ -0,0 +1,68 @@ > > +/* > > + * Copyright (C) 2008 IBM Corporation > > + * > > + * Authors: > > + * Mimi Zohar <zohar@us.ibm.com> > > + * > > + * This program is free software; you can redistribute it and/or > > + * modify it under the terms of the GNU General Public License as > > + * published by the Free Software Foundation, version 2 of the > > + * License. > > + * > > + * File: ima_iint.c > > + * cache integrity information associated with an inode > > + * using a radix tree. > > + */ > > +#include <linux/module.h> > > +#include <linux/spinlock.h> > > +#include <linux/radix-tree.h> > > +#include "ima.h" > > + > > +static struct radix_tree_root ima_iint_store; > > +DEFINE_SPINLOCK(ima_iint_lock); > > + > > +void ima_iint_init(void) > > +{ > > + INIT_RADIX_TREE(&ima_iint_store, GFP_ATOMIC); > > +} > > Use the RADIX_TREE() macro, then remove this function.
Done. Will be in next patch set.
Mimi
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